SurveyModel

Returns startPage if the survey currently displays a start page; otherwise, returns currentPage.

Type:

any readonly

Implemented in:

SurveyModel

See also:

startPage * , currentPage * , firstPageIsStartPage

Adds an element to the survey layout.

This method accepts an object with the following layout element properties:

• id: string | "timerpanel" | "progress-buttons" | "progress-questions" | "progress-pages" | "progress-correctquestions" | "progress-requiredquestions" | "toc-navigation" | "buttons-navigation"
  A layout element identifier. You can use possible values to access and relocate or customize predefined layout elements.

• container: "header" | "footer" | "left" | "right" | "contentTop" | "contentBottom"
  A layout container that holds the element. If you want to display the element within multiple containers, set this property to an array of possible values.

• component: string
  The name of the component that renders the layout element.

• data: any
  Data passed as props to component.

View Demo

Type:

(layoutElement: ISurveyLayoutElement) => ISurveyLayoutElement

Parameters:

layoutElement, type: ISurveyLayoutElement ,

A layout element configuration.

Return Value:

The configuration of the previous layout element with the same id.

Implemented in:

SurveyModel

Adds a custom navigation item similar to the Previous Page, Next Page, and Complete buttons. Accepts an object described in the IAction help section.

View Demo

Type:

(val: IAction) => Action

Parameters:

val, type: IAction

Implemented in:

SurveyModel

Creates a new page and adds it to the survey.

If you want to switch a survey to the newly added page, assign its index to the currentPageNo property or assign the entire page to the currentPage property.

Type:

(name?: string, index?: number) => PageModel

Parameters:

name, type: string ,

A page name. If you do not specify this parameter, it will be generated automatically.

index, type: number ,

An index at which to insert the page. If you do not specify this parameter, the page will be added to the end.

Return Value:

The created and added page.

Implemented in:

SurveyModel

See also:

addPage * , createNewPage

Adds an existing page to the survey.

Type:

(page: PageModel, index?: number) => void

Parameters:

page, type: PageModel ,

A page to add.

index, type: number ,

An index at which to insert the page. If you do not specify this parameter, the page will be added to the end.

Implemented in:

SurveyModel

See also:

addNewPage * , createNewPage

Type:

boolean writable

Implemented in:

SurveyModel

Specifies whether to display a resize handle for Long Text questions and other text areas intended for multi-line text content.

Default value: true

You can override this property for individual Long Text questions: allowResize.

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

True

Implemented in:

SurveyModel

See also:

autoGrowComment * , commentAreaRows

Applies a specified theme to the survey.

Themes & Styles

Type:

(theme: ITheme) => void

Parameters:

theme, type: ITheme ,

An ITheme object with theme settings.

Implemented in:

SurveyModel

Specifies whether to complete the survey automatically after a user answers all questions on the last page. Applies only if the autoAdvanceEnabled property is true.

Default value: true

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

True

Implemented in:

SurveyModel

See also:

`settings.autoAdvanceDelay`

Specifies whether the survey switches to the next page automatically after a user answers all questions on the current page.

Default value: false

If you enable this property, the survey is also completed automatically. Set the autoAdvanceAllowComplete property to false if you want to disable this behavior.

If any of the following questions is answered last, the survey does not switch to the next page: Checkboxes, Yes/No (Boolean) (rendered as Checkbox), Long Text, Signature, Image Picker (with Multi Select), File Upload, Single-Select Matrix (not all rows are answered), Dynamic Matrix, Dynamic Panel.

View Demo

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

`settings.autoAdvanceDelay`

Specifies whether to focus the first question with a validation error on the current page.

Default value: true

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

True

Implemented in:

SurveyModel

See also:

validate * , autoFocusFirstQuestion

Specifies whether to focus the first question on the page on survey startup or when users switch between pages.

Default value: false in v1.9.114 and later, true in earlier versions

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

autoFocusFirstError * , focusFirstQuestion * , focusQuestion

Specifies whether to increase the height of Long Text questions and other text areas to accommodate multi-line text content.

Default value: false

You can override this property for individual Long Text questions: autoGrow.

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

allowResizeComment * , commentAreaRows

An image to display in the background of the survey or form. Accepts a base64 or URL string value.

Type:

string readonly

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

backgroundOpacity

A value from 0 to 1 that specifies how transparent the background image should be: 0 makes the image completely transparent, and 1 makes it opaque.

Type:

number writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

1

Implemented in:

SurveyModel

Displays the Loading page.

Type:

() => void

Implemented in:

SurveyModel

See also:

endLoading

An array of calculated values.

View Demo

Type:

CalculatedValue[] writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

Cancels a preview of given answers and switches the survey to the page specified by the currentPage parameter.

Type:

(currentPage?: any) => void

Parameters:

currentPage, type: any ,

A new current page. If you do not specify this parameter, the survey displays the last page.

Implemented in:

SurveyModel

See also:

showPreview * , showPreviewBeforeComplete * , state

Specifies when the survey validates answers.

Possible values:

• "onNextPage" (default) - Triggers validation before the survey is switched to the next page or completed.
• "onValueChanged" - Triggers validation each time a question value is changed. View Demo
• "onComplete" - Triggers validation when a user clicks the Complete button. If previous pages contain errors, the survey switches to the page with the first error.

In SurveyJS Form Library v1.12.5 and earlier, the "onValueChanged" mode doesn't work with date input fields because of the way browsers process date values. In most browsers, the value is considered changed as soon as a user starts entering the date in a text input field. This means that a user may only enter the day without having the chance to enter the month and year before validation is triggered. For this reason, date input fields are validated before the survey is switched to the next page or completed. Starting with v1.12.6, "onValueChanged" works for date input fields as well as for input fields of other types.

Refer to the following help topic for more information: Data Validation.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

onNextPage

Accepted values:

onNextPage , onValueChanged , onComplete

Implemented in:

SurveyModel

See also:

validationEnabled * , validationAllowSwitchPages * , validationAllowComplete * , validate

Opens a dialog window for users to select files.

Type:

(input: any, callback: (files: any[]) => void, context?: { element: Base; item?: any; elementType?: string; propertyName?: string; }) => void

Parameters:

input, type: any ,

A file input HTML element.

callback, type: (files: any[]) => void ,

A callback function that you can use to process selected files. Accepts an array of JavaScript File objects.

context, type: { element: Base; item?: any; elementType?: string; propertyName?: string; }

Implemented in:

SurveyModel

See also:

onOpenFileChooser * , onUploadFile

Resets the survey state and, optionally, data. If state is "completed", it becomes "running".

Type:

(clearData?: boolean, goToFirstPage?: boolean) => void

Parameters:

clearData, type: boolean ,

(Optional) Specifies whether to clear survey data. Default value: true.

goToFirstPage, type: boolean ,

(Optional) Specifies whether to switch the survey to the first page. Default value: true.

Implemented in:

SurveyModel

Specifies whether to remove disabled choices from the value in Dropdown, Checkboxes, and Radio Button Group questions.

Default value: false

This property cannot be specified in the survey JSON schema. Use dot notation to specify it.

Type:

boolean writable

Implemented in:

SurveyModel

Removes values that cannot be assigned to a question, for example, choices unlisted in the choices array.

Call this method after you assign new question values in code to ensure that they are acceptable.

This method does not remove values that fail validation. Call the validate() method to validate newly assigned values.

Type:

(removeNonExistingRootKeys?: boolean) => void

Parameters:

removeNonExistingRootKeys, type: boolean ,

Pass true to remove values that do not correspond to any question or calculated value.

Implemented in:

SurveyModel

Specifies when to remove values of invisible questions from survey results.

Possible values:

• "onComplete" (default) - Clears invisible question values when the survey is complete.
• "onHidden" - Clears a question value when the question becomes invisible. If the question is invisible initially, its value is removed on survey completion.
• "onHiddenContainer" - Clears a question value when the question or its containter (page or panel) becomes invisible. If the question is invisible initially, its value is removed on survey completion.
• "none" - Keeps invisible values in survey results.
• true - Equivalent to "onComplete".
• false - Equivalent to "none".

Type:

any writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

onComplete

Accepted values:

none , onComplete , onHidden , onHiddenContainer

Implemented in:

SurveyModel

See also:

Conditional Visibility , onComplete

Deletes an answer from survey results.

Type:

(name: string) => void

Parameters:

name, type: string ,

An object property that stores the answer to delete. Pass a question's valueName or name.

Implemented in:

SurveyModel

Type:

boolean writable

Implemented in:

SurveyModel

Type:

string writable

Implemented in:

SurveyModel

Creates a new object that has the same type and properties as the current SurveyJS object.

Type:

() => Base

Implemented in:

Base

Specifies the visible height of comment areas, measured in lines. Applies to the questions with the showCommentArea or showOtherItem property enabled.

Default value: 2

The value of this property is passed on to the rows attribute of the underlying <textarea> element.

Type:

number writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

autoGrowComment * , allowResizeComment

An object with all comment values.

Type:

any readonly

Implemented in:

SurveyModel

See also:

Question.showCommentArea * , storeOthersAsComment

A suffix added to the name of the property that stores comments.

Default value: "-Comment"

Many question types allow respondents to leave comments. To enable this functionality, set a question's showCommentArea property to true. Comment values are saved in a separate property. The property name is composed of the question name and commentSuffix.

Respondents can also leave comments when they select "Other" in choice-based questions, such as Dropdown or Checkboxes. The property name for the comment value is composed according to the same rules. However, you can use the question name as a key to store the comment value instead. Disable the storeOthersAsComment property in this case.

View Demo

Type:

string writable

Implemented in:

SurveyModel

HTML content displayed to a user who has completed the survey before. To identify such users, the survey uses a cookie name.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

processedCompletedBeforeHtml

HTML content displayed on the complete page.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

showCompletePage * , completedHtmlOnCondition

An array of objects that allows you to specify different HTML content for the complete page.

Each object should include the expression and html properties. When expression evaluates to true, the survey uses the corresponding HTML markup instead of completedHtml. Refer to the following help topic for more information about expressions: Expressions.

View Demo

Type:

HtmlConditionItem[] writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

Type:

() => boolean

Implemented in:

SurveyModel

Gets or sets a caption for the Complete button.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

Localization & Globalization

A cookie name used to save information about survey completion.

When this property has a value, the survey creates a cookie with the specified name on completion. This cookie helps ensure that users do not pass the same survey twice. On the second run, they will see the Completed Before page.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

clientId

Creates and returns a new page but does not add it to the survey.

Call the addPage(page) method to add the created page to the survey later or the addNewPage(name, index) method to create and add a page to the survey.

Type:

(name: string) => PageModel

Parameters:

name, type: string

Implemented in:

SurveyModel

See also:

addPage * , addNewPage

Gets or sets an object in which keys are UI elements and values are CSS classes applied to them.

View Demo

Type:

any writable

Implemented in:

SurveyModel

Gets or sets the current page, panel, or question (depends on the questionsOnPageMode value).

The following table illustrates the dependency between questionsOnPageMode values and the types of survey elements that the currentElement property can contain:

Type:

ISurveyElement writable

Implemented in:

SurveyModel

Specifies the current page, panel, or question (depends on the questionsOnPageMode value) using its name.

The following table illustrates the dependency between questionsOnPageMode values and the types of survey elements that the currentElementName property can specify:

Type:

string writable

Implemented in:

SurveyModel

See also:

currentElement

Gets or sets the current page.

If you want to change the current page, set this property to a PageModel object. You can get this object in different ways. For example, you can call the getPageByName() method to obtain a PageModel object with a specific name:

survey.currentPage = survey.getPageByName("my-page-name");

Alternative ways to change the current page are listed below:

• Set the currentPageNo property to the index of the required page.
• Assign a required page name to the currentElementName property.
• Assign a required page to the currentElement property.

The currentPage property does not return the start page even if it is current. Use the activePage property instead if your survey contains a start page.

Type:

any writable

Implemented in:

SurveyModel

A zero-based index of the current page in the visiblePages array.

View Demo

Type:

number writable

Implemented in:

SurveyModel

See also:

visiblePages

Gets or sets an object with survey results. You can set this property with an object of the following structure:

{
  question1Name: question1Value,
  question2Name: question2Value,
  // ...
}

View Demo

When you set the data property in code, the new object overrides the old object that may contain default question values and entered data. If you want to merge the new and old objects, call the mergeData(newDataObj) method.

If you assign a new object while a respondent takes the survey, set the currentPageNo property to 0 to start the survey from the beginning. This will also cause the survey to re-evaluate the visibleIf, enableIf, and other expressions.

Type:

any writable

Implemented in:

SurveyModel

See also:

setValue * , getValue

Deletes a cookie with a specified cookieName from the browser.

Type:

() => void

Implemented in:

SurveyModel

See also:

hasCookie * , setCookie

Explanatory text displayed under the title.

Type:

string writable

Implemented in:

SurveyElementCore

See also:

hasDescription

Disposes of the survey model.

Call this method to release resources if your application contains multiple survey models or if you re-create a survey model at runtime.

Type:

() => void

Implemented in:

SurveyModel

Completes the survey.

When you call this method, Form Library performs the following actions:

1. Saves a cookie if the cookieName property is set.
2. Switches the survey state to "completed".
3. Raises the onComplete event.
4. Navigates the user to a URL specified by the navigateToUrl or navigateToUrlOnCondition property.

The doComplete() method completes the survey regardless of validation errors and the current page. If you need to ensure that survey results are valid and full, call the completeLastPage() method instead.

Type:

(isCompleteOnTrigger?: boolean, completeTrigger?: Trigger) => boolean

Parameters:

isCompleteOnTrigger, type: boolean ,

For internal use.

completeTrigger, type: Trigger ,

For internal use.

Return Value:

false if survey completion is cancelled within the onCompleting event handler; otherwise, true.

Implemented in:

SurveyModel

Gets or sets a caption for the Edit button displayed when the survey shows a preview of given answers.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

showPreviewBeforeComplete * , cancelPreview * , previewText

A message that is displayed when a survey does not contain visible pages or questions.

Type:

string writable

Implemented in:

SurveyModel

See also:

Localization & Globalization

Stops displaying the Loading page.

Type:

() => void

Implemented in:

SurveyModel

See also:

beginLoading

Type:

boolean writable

Implemented in:

SurveyModel

Gets or sets a Boolean value that specifies whether the first page is a start page.

Refer to the following help topic for more information: Start Page.

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

startPage * , activePage

Focuses the first question on the current page.

Type:

() => void

Implemented in:

SurveyModel

See also:

focusQuestion * , autoFocusFirstQuestion

Type:

boolean writable

Implemented in:

SurveyModel

Type:

boolean writable

Implemented in:

SurveyModel

Focuses a question with a specified name. Switches the current page if needed.

Type:

(name: string) => boolean

Parameters:

name, type: string ,

A question name.

Return Value:

false if the survey does not contain a question with the specified name or this question is hidden; otherwise, true.

Implemented in:

SurveyModel

See also:

focusFirstQuestion * , autoFocusFirstQuestion

Assigns a new JSON schema to the current survey element.

The JSON schema should contain only serializable properties of this survey element. Event handlers and properties that do not belong to the survey element are ignored.

Type:

(json: any, options?: ILoadFromJSONOptions) => void

Parameters:

json, type: any ,

A JSON schema that you want to apply to the current survey element.

options, type: ILoadFromJSONOptions ,

An object with configuration options.

Implemented in:

Base

See also:

toJSON

Returns a list of all panels in the survey.

Type:

(visibleOnly?: boolean, includeDesignTime?: boolean) => IPanel[]

Parameters:

visibleOnly, type: boolean ,

A Boolean value that specifies whether to include only visible panels.

includeDesignTime, type: boolean ,

For internal use.

Return Value:

An array of panels.

Implemented in:

SurveyModel

See also:

getPanelByName

Returns a list of all questions in the survey.

Type:

(visibleOnly?: boolean, includeDesignTime?: boolean, includeNested?: boolean) => Question[]

Parameters:

visibleOnly, type: boolean ,

A Boolean value that specifies whether to include only visible questions.

includeDesignTime, type: boolean ,

For internal use.

includeNested, type: boolean ,

A Boolean value that specifies whether to include nested questions, such as questions within matrix cells.

Return Value:

An array of questions.

Implemented in:

SurveyModel

See also:

getQuestionByName

Returns a comment value from a question with a specified name.

Type:

(name: string) => string

Parameters:

name, type: string ,

A question name.

Return Value:

A comment.

Implemented in:

SurveyModel

See also:

setComment

Returns the number of correct answers in a quiz.

For more information about quizzes, refer to the following tutorial: Create a Quiz.

Type:

() => number

Return Value:

The number of correct answers in a quiz.

Implemented in:

SurveyModel

See also:

getQuizQuestionCount * , getIncorrectAnswerCount

Returns an object with survey results.

If you want to get a survey results object that mirrors the survey structure, call the getData() method with an object that has the includePages and includePanels properties enabled. Without this object, the getData() method returns the data property value.

import { Model } from "survey-core";

const surveyJson = { ... };
const survey = new Model(surveyJson);
survey.getData({ includePages: true, includePanels: true });

Type:

(options?: { includePages?: boolean; includePanels?: boolean; }) => any

Parameters:

options, type: { includePages?: boolean; includePanels?: boolean; }

Implemented in:

SurveyModel

Returns a page, panel, or question with a specified name.

Type:

(name: string) => ISurveyElement

Parameters:

name, type: string ,

A survey element name.

Return Value:

A survey element with the specified name.

Implemented in:

SurveyModel

See also:

currentElementName

Returns the number of incorrect answers in a quiz.

For more information about quizzes, refer to the following tutorial: Create a Quiz.

Type:

() => number

Return Value:

The number of incorrect answers in a quiz.

Implemented in:

SurveyModel

See also:

getCorrectAnswerCount

Returns a page to which a specified survey element (question or panel) belongs.

Type:

(element: IElement) => PageModel

Parameters:

element, type: IElement ,

A question or panel instance.

Implemented in:

SurveyModel

Returns a page with a specified name.

Type:

(name: string) => PageModel

Parameters:

name, type: string ,

A page name.

Return Value:

A page with the specified name.

Implemented in:

SurveyModel

Returns a page to which a specified question belongs.

Type:

(question: IQuestion) => PageModel

Parameters:

question, type: IQuestion ,

A question instance.

Implemented in:

SurveyModel

Returns a panel with a specified name.

Type:

(name: string, caseInsensitive?: boolean) => PanelModel

Parameters:

name, type: string ,

A panel name.

caseInsensitive, type: boolean

Return Value:

A panel with the specified name.

Implemented in:

SurveyModel

See also:

getAllPanels

Returns survey results as an array of objects in which the question name, title, value, and other parameters are stored as individual properties.

If a question can have more than one value (Matrix, Multiple Text), its object enables the isNode flag and stores information about these values in the data property. Refer to the following help topic for more information: Access Full Survey Results.

If you want to skip empty answers, pass an object with the includeEmpty property set to false.

Type:

(options?: IPlainDataOptions) => IQuestionPlainData[]

Parameters:

options, type: IPlainDataOptions

Implemented in:

SurveyModel

Returns a JsonObjectProperty object with metadata about a serializable property that belongs to the current SurveyJS object.

If the property is not found, this method returns null.

Type:

(propName: string) => JsonObjectProperty

Parameters:

propName, type: string ,

A property name.

Implemented in:

Base

Returns the value of a property with a specified name.

If the property is not found or does not have a value, this method returns either undefined, defaultValue specified in the property configuration, or a value passed as the defaultValue parameter.

Type:

(name: string, defaultValue?: any, calcFunc?: () => any) => any

Parameters:

name, type: string ,

A property name.

defaultValue, type: any ,

(Optional) A value to return if the property is not found or does not have a value.

calcFunc, type: () => any

Implemented in:

Base

Returns a question with a specified name.

Type:

(name: string, caseInsensitive?: boolean) => Question

Parameters:

name, type: string ,

A question name.

caseInsensitive, type: boolean

Return Value:

A question with the specified name.

Implemented in:

SurveyModel

See also:

getAllQuestions * , getQuestionByValueName

Returns a question with a specified valueName.

Since valueName does not have to be unique, multiple questions can have the same valueName value. In this case, the getQuestionByValueName() method returns the first such question. If you need to get all questions with the same valueName, call the getQuestionsByValueName() method.

Type:

(valueName: string, caseInsensitive?: boolean) => Question

Parameters:

valueName, type: string ,

A question's valueName property value.

caseInsensitive, type: boolean

Return Value:

A question with a specified valueName.

Implemented in:

SurveyModel

See also:

getAllQuestions * , getQuestionByName

Returns all questions with a specified valueName. If a question's valueName is undefined, its name property is used.

Type:

(valueName: string, caseInsensitive?: boolean) => Question[]

Parameters:

valueName, type: string ,

A question's valueName property value.

caseInsensitive, type: boolean

Return Value:

An array of questions with a specified valueName.

Implemented in:

SurveyModel

See also:

getAllQuestions * , getQuestionByName

Returns the number of quiz questions. A question counts if it is visible, has an input field, and specifies correctAnswer.

This number may be different from getQuizQuestions().length because certain question types (for instance, matrix-like types) include more than one question.

For more information about quizzes, refer to the following tutorial: Create a Quiz.

Type:

() => number

Return Value:

The number of quiz questions.

Implemented in:

SurveyModel

See also:

getQuizQuestions

Returns an array of quiz questions. A question counts if it is visible, has an input field, and specifies correctAnswer.

For more information about quizzes, refer to the following tutorial: Create a Quiz.

Type:

() => IQuestion[]

Return Value:

An array of quiz questions.

Implemented in:

SurveyModel

See also:

getQuizQuestionCount

Type:

(resultId: string, questionName: string) => void

Parameters:

resultId, type: string

questionName, type: string

Implemented in:

SurveyModel

Returns the object type as it is used in the JSON schema.

Type:

() => string

Implemented in:

Base

Returns an array of locales whose translations are used in the survey.

Localization & Globalization help topic

Survey Localization demo

Type:

() => string[]

Implemented in:

SurveyModel

Returns a value (answer) for a question with a specified name.

Type:

(name: string) => any

Parameters:

name, type: string ,

A question name.

Return Value:

A question value (answer).

Implemented in:

SurveyModel

See also:

data * , setValue

Returns a variable value.

Variables help topic

Type:

(name: string) => any

Parameters:

name, type: string ,

A variable name.

Implemented in:

SurveyModel

See also:

setVariable * , getVariableNames

Returns the names of all variables in the survey.

Variables help topic

Type:

() => string[]

Return Value:

An array of variable names.

Implemented in:

SurveyModel

See also:

getVariable * , setVariable

Type:

boolean writable

Implemented in:

SurveyModel

Enables the grid layout, which structures form elements using a column-based system.

Default value: false

Specify the gridLayoutColumns property for pages and panels to configure layout columns. Set the colSpan property for an individual question or panel to adjust how many columns this survey element spans.

Type:

boolean readonly

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

Indicates whether the browser has a cookie with a specified cookieName. If this property's value is true, the respondent has passed the survey previously.

Type:

boolean readonly

Implemented in:

SurveyModel

See also:

setCookie * , deleteCookie

Returns true if the survey element has a description.

Type:

boolean writable

Implemented in:

SurveyElementCore

See also:

description

Type:

"advanced" | "basic" readonly

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

basic

Accepted values:

basic , advanced

Implemented in:

SurveyModel

Specifies whether to hide validation errors thrown by the Required validation in the UI.

Built-In Client-Side Validators

Type:

boolean readonly

Implemented in:

SurveyModel

See also:

validationEnabled * , validationAllowSwitchPages

Type:

boolean writable

Implemented in:

SurveyModel

Returns true if the object is included in a survey.

This property may return false, for example, when you create a survey model dynamically.

Type:

boolean readonly

Implemented in:

Base

Returns true if the current page does not contain errors.

Type:

boolean readonly

Implemented in:

SurveyModel

See also:

currentPage

Use this method to find out if the current object is of a given typeName or inherited from it.

Type:

(typeName: string) => boolean

Parameters:

typeName, type: string ,

One of the values listed in the getType() description.

Return Value:

true if the current object is of a given typeName or inherited from it.

Implemented in:

Base

See also:

getType

Indicates whether the survey is being designed in Survey Creator.

Type:

boolean readonly

Implemented in:

SurveyModel

Returns true if the survey contains zero pages.

Type:

boolean readonly

Implemented in:

SurveyModel

See also:

emptySurveyText

Indicates whether the current page is the first page.

If the survey displays the start page, this property contains false. Use the isStartPageActive property to find out whether the start page is currently displayed.

Type:

boolean readonly

Implemented in:

SurveyModel

Indicates whether the current page is the last page.

Type:

boolean readonly

Implemented in:

SurveyModel

Returns true if the object configuration is being loaded from JSON.

Type:

boolean readonly

Implemented in:

Base

Returns true if the survey element is a page.

This property returns false for PageModel objects in the following cases:

• SurveyModel's questionsOnPageMode is set to "singlePage".
• The page is included in a preview of given answers.

In those cases, the survey creates an internal PageModel object to show all questions on one page, and all regular pages become panels.

Type:

boolean readonly

Implemented in:

SurveyElementCore

Returns true if the survey element is a panel or acts as one.

This property returns true for PageModel objects in the following cases:

• SurveyModel's questionsOnPageMode is set to "singlePage".
• The page is included in a preview of given answers.

In those cases, the survey creates an internal PageModel object to show all questions on one page, and all regular pages become panels.

Type:

boolean readonly

Implemented in:

SurveyElementCore

Returns true if the survey element is a question.

Type:

boolean readonly

Implemented in:

SurveyElementCore

Type:

boolean readonly

Implemented in:

SurveyModel

A Boolean value that indicates whether the start page is currently displayed.

Type:

boolean readonly

Implemented in:

SurveyModel

Returns true if the element is a survey.

Type:

boolean readonly

Implemented in:

SurveyElementCore

Indicates whether the current page is being validated on a server.

Type:

boolean readonly

Implemented in:

SurveyModel

Returns true if a passed value is an empty string, array, or object or if it equals to undefined or null.

Type:

(value: any, trimString?: boolean) => boolean

Parameters:

value, type: any ,

A value to be checked.

trimString, type: boolean ,

(Optional) When this parameter is true, the method ignores whitespace characters at the beginning and end of a string value. Pass false to disable this functionality.

Implemented in:

Base

A list of errors in a survey JSON schema.

Type:

JsonError[] readonly

Implemented in:

SurveyModel

See also:

ensureUniqueNames

Specifies whether to keep values that cannot be assigned to questions, for example, choices unlisted in the choices array.

This property cannot be specified in the survey JSON schema. Use dot notation to specify it.

Type:

boolean writable

Implemented in:

SurveyModel

See also:

clearIncorrectValues

Specifies whether to enable lazy rendering.

In default mode, a survey renders the entire current page. With lazy rendering, the survey renders the page gradually as a user scrolls it. This helps reduce survey startup time and optimizes large surveys for low-end devices.

Default value: false

View Demo

Type:

boolean writable

Implemented in:

SurveyModel

See also:

settings.lazyRender

Type:

boolean writable

Implemented in:

SurveyModel

HTML content displayed while a survey JSON schema is being loaded.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

processedLoadingHtml

Type:

(surveyId?: string, clientId?: string) => void

Parameters:

surveyId, type: string

clientId, type: string

Implemented in:

SurveyModel

Specifies the survey's locale.

Default value: "" (a default locale is used)

Localization & Globalization help topic

Survey Localization demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Accepted values:

Implemented in:

SurveyModel

An image URL or a Base64-encoded image to use as a survey logo.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

logoPosition * , logoFit

Specifies how to resize a logo to fit it into its container.

Possible values:

• "contain" (default)
• "cover"
• "fill"
• "none"

Refer to the object-fit CSS property description for information on the possible values.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

contain

Accepted values:

none , contain , cover , fill

Implemented in:

SurveyModel

See also:

logo * , logoPosition

A logo height in CSS-accepted values.

Default value: 40px

View Demo

Type:

any writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

40px

Implemented in:

SurveyModel

See also:

logoWidth * , logo * , logoPosition * , logoFit

A logo position relative to the survey title.

Possible values:

• "left" (default) - Places the logo to the left of the survey title.
• "right" - Places the logo to the right of the survey title.
• "none" - Hides the logo.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

left

Accepted values:

none , left , right , top , bottom

Implemented in:

SurveyModel

See also:

logo * , logoFit

A logo width in CSS-accepted values.

Default value: auto (the width is calculated automatically based on the logoHeight value to keep the original aspect ratio)

View Demo

Type:

any writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

auto

Implemented in:

SurveyModel

See also:

logo * , logoPosition * , logoFit

Specifies which part of a matrix row responds to a drag gesture in Dynamic Matrix questions.

Possible values:

• "entireItem" (default) - Users can use the entire matrix row as a drag handle.
• "icon" - Users can only use a drag icon as a drag handle.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

entireItem

Accepted values:

entireItem , icon

Implemented in:

SurveyModel

Specifies the maximum text length for question comments. Applies to questions with the showCommentArea or showOtherItem property set to true.

Default value: 0 (unlimited)

Type:

number writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

maxTextLength

Type:

number writable

Implemented in:

SurveyModel

Specifies the maximum text length in textual questions (Single-Line Input, Long Text, Multiple Textboxes), measured in characters.

Default value: 0 (unlimited)

You can override this setting for individual questions if you specify their maxLength property.

Type:

number writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

maxCommentLength

Type:

number writable

Implemented in:

SurveyModel

Type:

number writable

Implemented in:

SurveyModel

Merges a specified data object with the object from the data property.

Refer to the following help topic for more information: Populate Form Fields | Multiple Question Values.

Type:

(data: any) => void

Parameters:

data, type: any ,

A data object to merge. It should have the following structure: { questionName: questionValue, ... }

Implemented in:

SurveyModel

See also:

setValue

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

edit

Accepted values:

edit , display

Implemented in:

SurveyModel

A URL to which respondents should be navigated after survey completion.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

onNavigateToUrl * , navigateToUrlOnCondition

An array of objects that allows you to navigate respondents to different URLs after survey completion.

Each object should include the expression and url properties. When expression evaluates to true, the survey navigates to the corresponding url. Refer to the following help topic for more information about expressions: Expressions.

Type:

UrlConditionItem[] writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

onNavigateToUrl * , navigateToUrl

Gets or sets the position of the Start, Next, Previous, and Complete navigation buttons. Applies only if the showNavigationButtons property is true.

Possible values:

• "bottom" (default) - Displays the navigation buttons below survey content.
• "top" - Displays the navigation buttons above survey content.
• "topBottom" - Displays the navigation buttons above and below survey content.

Type:

any writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

bottom

Accepted values:

top , bottom , topBottom

Implemented in:

SurveyModel

See also:

autoAdvanceEnabled * , showPrevButton * , showCompleteButton

Switches the survey to the next page.

This method returns a Boolean value that indicates whether the page was successfully switched. false is returned if the current page is the last page or if it contains validation errors.

Type:

() => boolean

Return Value:

true if the page was successfully switched; false otherwise.

Implemented in:

SurveyModel

See also:

isLastPage * , prevPage * , completeLastPage

Displays a toast notification with a specified message.

Depending on the type argument, a survey can display the following notification types:

Type:

(message: string, type: string, showActions?: boolean) => void

Parameters:

message, type: string ,

A message to display.

type, type: string ,

A notification type: "info" (default), "success", or "error".

showActions, type: boolean ,

For internal use.

Implemented in:

SurveyModel

An event that is raised after a cell in a Multi-Select Matrix or Dynamic Matrix is rendered to the DOM.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.htmlElement: any
  A rendered HTML element.
• options.cell: MatrixDropdownCell
  A matrix cell for which the event is raised.
• options.cellQuestion: Question
  A Question instance within the matrix cell.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.column: MatrixDropdownColumn | MatrixDropdownCell
  A matrix column to which the cell belongs.

Type:

EventBase<SurveyModel, MatrixAfterCellRenderEvent>

Implemented in:

SurveyModel

See also:

onMatrixCellCreated

An event that is raised after a page is rendered to the DOM. Use it to modify page markup.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.htmlElement: any
  A rendered HTML element.
• options.page: PageModel
  A Page instance for which the event is raised.

View Demo

Type:

EventBase<SurveyModel, AfterRenderPageEvent>

Implemented in:

SurveyModel

An event that is raised after a panel is rendered to the DOM. Use it to modify panel markup.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.htmlElement: any
  A rendered HTML element.
• options.panel: PanelModel
  A Panel instance for which the event is raised.

This event is raised for static Panels as well as panels within a Dynamic Panel.

Type:

EventBase<SurveyModel, AfterRenderPanelEvent>

Implemented in:

SurveyModel

An event that is raised after a question is rendered to the DOM. Use it to modify question markup.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.htmlElement: any
  A rendered HTML element.

View Demo

Type:

EventBase<SurveyModel, AfterRenderQuestionEvent>

Implemented in:

SurveyModel

An event that is raised after a question with a single input field is rendered to the DOM. Use it to modify question markup.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.htmlElement: any
  A rendered HTML element.

This event is not raised for questions without input fields (HTML, Image) or questions with multiple input fields (Matrix, Multiple Text).

Type:

EventBase<SurveyModel, AfterRenderQuestionInputEvent>

Implemented in:

SurveyModel

An event that is raised after the survey is rendered to the DOM. Use this event to modify survey markup.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.htmlElement: any
  A rendered HTML element.

View Demo

Type:

EventBase<SurveyModel, AfterRenderSurveyEvent>

Implemented in:

SurveyModel

An event that is raised to define whether a question answer is correct. Applies only to quiz surveys.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.result: boolean
  A Boolean property that specifies whether the answer is correct (true) or incorrect (false). Use the options.question.value and options.question.correctAnswer properties to check the answer.
• options.correctAnswerCount: number
  The number of correct answers in a matrix where each row is considered as one quiz question.
• options.incorrectAnswerCount: number
  The number of incorrect answers in a matrix where each row is considered as one quiz question.

Type:

EventBase<SurveyModel, CheckAnswerCorrectEvent>

Implemented in:

SurveyModel

Use this event to load choice items in Dropdown and Tag Box questions on demand.

This event is raised only for those questions that have the choicesLazyLoadEnabled property set to true.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.setItems: (items: (string | { value: any; text?: string; imageLink?: string; customProperty?: any; })[], totalCount: number) => void
  A method that you should call to assign loaded items to the question. Item objects should be structured as specified in the choices property description. If their structure is different, map their properties to bring them to the required structure.
• options.filter: string
  A search string used to filter choices.
• options.take: number
  The number of choice items to load. You can use the question's choicesLazyLoadPageSize property to change this number.
• options.skip: number
  The number of choice items to skip.

View Demo

Type:

EventBase<SurveyModel, ChoicesLazyLoadEvent>

Implemented in:

SurveyModel

An event that is raised after choices are loaded from a server but before they are assigned to a choice-based question, such as Dropdown or Checkboxes. Handle this event if you need to modify the loaded choices.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.serverResult: any
  A query result as it came from the server.
• options.choices: ItemValue[]
  An array of loaded choices. You can modify this array.

Type:

EventBase<SurveyModel, ChoicesLoadedEvent>

Implemented in:

SurveyModel

An event that is raised each time a search string in a Dropdown or Tag Box question changes. Use this event to implement custom filtering of choice options.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.filter: string
  A search string used to filter choice options.
• options.choices: ItemValue[]
  An array of all choice options.
• options.filteredChoices: ItemValue[]
  A filtered array of choice options. Apply options.filter to the options.choices array and assign the result to this parameter.

Type:

EventBase<SurveyModel, ChoicesSearchEvent>

Implemented in:

SurveyModel

See also:

QuestionDropdownModel.searchEnabled , QuestionDropdownModel.searchMode

An event that is raised when users clear files in a File Upload question or clear signature in a Signature Pad question. Use this event to delete files from your server.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionFileModel | QuestionSignaturePadModel
  A File Upload or Signature Pad question instance for which the event is raised.
• options.name: string
  A File Upload question's name.
• options.callback: (status: string, data?: any) => any
  A callback function that you should call when files are deleted successfully or when deletion fails. Pass "success" or "error" as the first argument to indicate the operation status. As the second argument, you can pass deleted files' data (options.value) if file deletion was successful or an error message if file deletion failed.
• options.fileName: string
  The name of a file to delete. When this parameter is null, all files should be deleted.
• options.value: any
  The File Upload question's value that contains metadata about uploaded files.

File Upload Demo

Signature Pad Demo

Type:

EventBase<SurveyModel, ClearFilesEvent>

Implemented in:

SurveyModel

See also:

clearFiles * , onDownloadFile * , onUploadFiles

An event that is raised after the survey is completed. Use this event to send survey results to the server.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.isCompleteOnTrigger: boolean
  Returns true if survey completion is caused by a "complete" trigger.
• options.completeTrigger: Trigger
  A "complete" trigger that has been executed. This parameter has a value only if options.isCompleteOnTrigger is true.
• options.clearSaveMessages: (test?: string) => void
  Call this method to hide the save operation messages.
• options.showSaveSuccess: (text?: string) => void
  Call this method to indicate that survey results are successfully saved. You can use the text parameter to display a custom message.
• options.showSaveError: (text?: string) => void
  Call this method to indicate that an error occurred during the save operation. You can use the text parameter to display a custom error message.
• options.showSaveInProgress: (text?: string) => void
  Call this method to indicate that the save operation is in progress. You can use the text parameter to display a custom message.

For an example of how to use the methods described above, refer to the following help topic: Store Survey Results in Your Own Database.

Do not disable the showCompletePage property if you call one of the options.showSave... methods. This is required because the UI that indicates data saving progress is integrated into the complete page. If you hide the complete page, the UI also becomes invisible.

Type:

EventBase<SurveyModel, CompleteEvent>

Implemented in:

SurveyModel

See also:

onPartialSend * , doComplete * , autoAdvanceAllowComplete

An event that is raised before the survey is completed. Use this event to prevent survey completion.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.isCompleteOnTrigger: boolean
  Returns true if survey completion is caused by a "complete" trigger.
• options.completeTrigger: Trigger
  A "complete" trigger that has been executed. This parameter has a value only if options.isCompleteOnTrigger is true.
• options.allow: boolean
  A Boolean property that you can set to false if you want to prevent survey completion.

Type:

EventBase<SurveyModel, CompletingEvent>

Implemented in:

SurveyModel

See also:

onComplete * , doComplete * , autoAdvanceAllowComplete

An event that is raised when users add a custom choice option to a Single- or Multi-Select Dropdown question. Handle this event to save the choice option in a data storage.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionSelectBase
  A question for which the event is raised.
• options.item: ItemValue
  A custom choice item. To access its value and display text, use the options.item.value and options.item.text properties.
• options.allow: boolean
  A Boolean property that you can set to false if you want to prevent the item from being added.

To let users add their own choice options, enable the allowCustomChoices property for individual dropdown questions.

View Demo

Type:

EventBase<SurveyModel, CreateCustomChoiceItemEvent>

Implemented in:

SurveyModel

An event that is raised after the current page is switched.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.isPrevPage: boolean
  Returns true if the respondent is switching to the previous page.
• options.isNextPage: boolean
  Returns true if the respondent is switching to the next page.
• options.isGoingBackward: boolean
  Returns true if the respondent is going backward, that is, newCurrentPage or newCurrentQuestion is earlier in the survey than oldCurrentPage or oldCurrentQuestion.
• options.isGoingForward: boolean
  Returns true if the respondent is going forward along the survey.
• options.isAfterPreview: boolean
  Returns true if the respondent is switching from the preview page.
• options.newCurrentPage: PageModel
  The current page.
• options.oldCurrentPage: PageModel
  A page that used to be current.
  In question-per-page mode, the oldCurrentPage and newCurrentPage parameters may contain the same PageModel instance. This is because the survey doesn't create artificial pages to display only one question per page. If both the previous and current questions belong to the same page in the survey JSON schema, they have the same parent PageModel instance.
• options.oldCurrentQuestion: Question
  The current question.
  This parameter has a value only in question-per-page mode.
• options.newCurrentQuestion: Question
  A question that used to be current.
  This parameter has a value only in question-per-page mode.

View Demo

Type:

EventBase<SurveyModel, CurrentPageChangedEvent>

Implemented in:

SurveyModel

See also:

currentPageNo * , nextPage * , prevPage

An event that is raised before the current page is switched.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.isPrevPage: boolean
  Returns true if the respondent is switching to the previous page.
• options.isNextPage: boolean
  Returns true if the respondent is switching to the next page.
• options.isGoingBackward: boolean
  Returns true if the respondent is going backward, that is, newCurrentPage or newCurrentQuestion is earlier in the survey than oldCurrentPage or oldCurrentQuestion.
• options.isGoingForward: boolean
  Returns true if the respondent is going forward along the survey.
• options.isAfterPreview: boolean
  Returns true if the respondent is switching from the preview page.
• options.newCurrentPage: PageModel
  The current page.
• options.oldCurrentPage: PageModel
  A page that used to be current.
  In question-per-page mode, the oldCurrentPage and newCurrentPage parameters may contain the same PageModel instance. This is because the survey doesn't create artificial pages to display only one question per page. If both the previous and current questions belong to the same page in the survey JSON schema, they have the same parent PageModel instance.
• options.oldCurrentQuestion: Question
  The current question.
  This parameter has a value only in question-per-page mode.
• options.newCurrentQuestion: Question
  A question that used to be current.
  This parameter has a value only in question-per-page mode.
• options.allow: boolean
  A Boolean property that you can set to false if you do not want to switch the current page.

Type:

EventBase<SurveyModel, CurrentPageChangingEvent>

Implemented in:

SurveyModel

See also:

currentPageNo * , nextPage * , prevPage **

An event that is raised when a File Upload question starts to download a file. Use this event to implement file preview when your server stores only file names.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionFileModel | QuestionSignaturePadModel
  A File Upload or Signature Pad question instance for which the event is raised.
• options.name: string
  A File Upload question's name.
• options.callback: (status: string, data?: any) => any
  A callback function that you should call when a file is downloaded successfully or when deletion fails. Pass "success" or "error" as the first argument to indicate the operation status. As the second argument, you can pass the downloaded file's data as a Base64 string if file download was successful or an error message if file download failed.
• options.fileValue: any
  The File Upload question's value that contains metadata about uploaded files.
• options.content: any
  A file identifier (URL, file name, etc.) stored in survey results.

View Demo

Type:

EventBase<SurveyModel, DownloadFileEvent>

Implemented in:

SurveyModel

See also:

downloadFile * , onClearFiles * , onUploadFiles

An event that is raised when users drag and drop survey elements while designing the survey in Survey Creator. Use this event to control drag and drop operations.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.draggedElement: IElement
  A survey element being dragged.
• options.fromElement: IPanel
  A survey element from which draggedElement is being dragged. This parameter is null if draggedElement is being dragged from the Toolbox.
• options.toElement: IElement
  A survey element to which draggedElement is being dragged.
• options.insertBefore: IElement
  A survey element before which the target element will be placed. This parameter is null if the parent container (page or panel) has no elements or if the target element will be placed below all other elements within the container.
• options.insertAfter: IElement
  A survey element after which draggedElement will be placed. This parameter is null if the parent container (page or panel) has no elements or if draggedElement will be placed above all other elements within the container.
• options.parent: ISurveyElement
  A parent container (page or panel) within which draggedElement will be placed.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel the drag and drop operation.

Type:

EventBase<SurveyModel, DragDropAllowEvent>

Implemented in:

SurveyModel

See also:

isDesignMode

An event that is raised after a new panel is added to a Dynamic Panel question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.panelIndex: number
  The panel's index within Dynamic Panel.

Type:

EventBase<SurveyModel, DynamicPanelModifiedEvent>

Implemented in:

SurveyModel

An event that is raised after the current panel is changed in a Dynamic Panel question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panel: PanelModel
  A panel for which the event is raised.
• options.visiblePanelIndex: number
  The panel's index in the visiblePanels array of the Dynamic Panel.

Type:

EventBase<SurveyModel, DynamicPanelCurrentIndexChangedEvent>

Implemented in:

SurveyModel

An event that is raised after a panel is deleted from a Dynamic Panel question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.panelIndex: number
  The panel's index within Dynamic Panel.

Type:

EventBase<SurveyModel, DynamicPanelModifiedEvent>

Implemented in:

SurveyModel

An event that is raised before a panel is deleted from a Dynamic Panel question. Use this event to cancel the deletion.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.panelIndex: number
  The panel's index within Dynamic Panel.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel panel deletion.

Type:

EventBase<SurveyModel, DynamicPanelRemovingEvent>

Implemented in:

SurveyModel

An event that is raised after a value is changed in a panel within a Dynamic Panel question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panelData: { [index: string]: any; }
  The panel's data object that includes all item values.
• options.panelIndex: number
  The panel's index within Dynamic Panel.
• options.name: string
  The item's name.
• options.panel: PanelModel
  A panel that nests the item with a changed value.
• options.value: any
  The item's new value.

Type:

EventBase<SurveyModel, DynamicPanelItemValueChangedEvent>

Implemented in:

SurveyModel

An event that is raised before a value is changed in a panel within a Dynamic Panel question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panelData: { [index: string]: any; }
  The panel's data object that includes all item values.
• options.panelIndex: number
  The panel's index within Dynamic Panel.
• options.name: string
  The item's name.
• options.panel: PanelModel
  A panel that nests the item with a changed value.
• options.value: any
  The item's new value.
• options.oldValue: any
  The item's old value.

Type:

EventBase<SurveyModel, DynamicPanelValueChangingEvent>

Implemented in:

SurveyModel

An event that is raised when an element within a panel gets focus.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.

Type:

EventBase<SurveyModel, FocusInPanelEvent>

Implemented in:

SurveyModel

See also:

onFocusInQuestion * , autoFocusFirstQuestion * , focusQuestion

An event that is raised when an element (input field, checkbox, radio button) within a question gets focus.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.

Type:

EventBase<SurveyModel, FocusInQuestionEvent>

Implemented in:

SurveyModel

See also:

onFocusInPanel * , autoFocusFirstQuestion * , focusQuestion

Use this event to load a display text for the default choice item in Dropdown and Tag Box questions.

If you load choices from a server (use choicesByUrl or onChoicesLazyLoad), display texts become available only when data is loaded, which does not happen until a user opens the drop-down menu. However, a display text for a default choice item is required before that. In this case, you can load data individually for the default item within the onGetChoiceDisplayValue event handler.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.setItems: (displayValues: string[], ...customValues: IValueItemCustomPropValues[]) => void
  A method that you should call to assign display texts to the question.
• options.values: any[]
  An array of one (in Dropdown) or more (in Tag Box) default values.

View Demo

Type:

EventBase<SurveyModel, GetChoiceDisplayValueEvent>

Implemented in:

SurveyModel

An event that is raised before a Dynamic Panel renders tab titles. Use this event to change individual tab titles.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel question instance for which the event is raised.
• options.panel: PanelModel
  A panel for which the event is raised.
• options.visiblePanelIndex: number
  The panel's index in the visiblePanels array of the Dynamic Panel.
• options.title: string
  A tab title. You can change this parameter's value.

View Demo

Type:

EventBase<SurveyModel, DynamicPanelGetTabTitleEvent>

Implemented in:

SurveyModel

An event that is raised before an Expression question displays a value. Use this event to override the display value.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.displayValue: any
  A question's display text. You can assign a custom value to this parameter.
• options.value: any
  An expression value.

Type:

EventBase<SurveyModel, GetExpressionDisplayValueEvent>

Implemented in:

SurveyModel

An event that allows you to add, delete, or modify actions in rows of a Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.actions: IAction[]
  An array of actions. You can modify the entire array or individual actions within it.
• options.row: MatrixDropdownRowModelBase
  A matrix row for which the event is raised.

View Demo

Type:

EventBase<SurveyModel, GetMatrixRowActionsEvent>

Implemented in:

SurveyModel

See also:

IAction

An event that is raised before the survey calculates a page number. Handle this event to modify page numbers.

This event is raised only if the showPageNumbers property is enabled.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.page: PageModel
  A Page instance for which the event is raised.
• options.number: string
  A page number. Note that this is a string value that contains not only the number itself but also the characters that separate the number from the page title: "1. ", "2. ", etc. You can change this parameter's value.

Type:

EventBase<SurveyModel, GetPageNumberEvent>

Implemented in:

SurveyModel

See also:

onGetQuestionTitle * , questionStartIndex

An event that allows you to add, delete, or modify actions in a page title.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.page: PageModel
  A Page instance for which the event is raised.
• options.actions: IAction[]
  An array of actions associated with the processed element.

View Demo

Type:

EventBase<SurveyModel, GetPageTitleActionsEvent>

Implemented in:

SurveyModel

See also:

IAction

An event that allows you to add, delete, or modify actions in the footer of a Panel. This panel may belong to a Dynamic Panel or be a standalone survey element.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.actions: IAction[]
  An array of actions. You can modify the entire array or individual actions within it.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.question: QuestionPanelDynamicModel
  A Dynamic Panel to which the Panel belongs. This field is undefined if the Panel does not belong to any Dynamic Panel.

Type:

EventBase<SurveyModel, GetPanelFooterActionsEvent>

Implemented in:

SurveyModel

See also:

IAction

An event that is raised before the survey calculates a panel number. Handle this event to modify panel numbers.

This event is raised only for the panels with a specified title and visible number.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.number: string
  A panel number. Note that this is a string value that contains not only the number itself but also the characters that separate the number from the panel title: "1. ", "2. ", etc. You can change this parameter's value.

Type:

EventBase<SurveyModel, GetPanelNumberEvent>

Implemented in:

SurveyModel

An event that allows you to add, delete, or modify actions in a panel title.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.actions: IAction[]
  An array of actions associated with the processed element.

Type:

EventBase<SurveyModel, GetPanelTitleActionsEvent>

Implemented in:

SurveyModel

See also:

IAction

An event that is raised before the survey displays progress text. Handle this event to change the progress text in code.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.questionCount: number
  The number of questions with input fields. Image, HTML, and Expression questions are not counted.
• options.answeredQuestionCount: number
  The number of answered questions.
• options.requiredQuestionCount: number
  The number of questions marked as required.
• options.requiredAnsweredQuestionCount: number
  The number of answered questions marked as required.
• options.text: string
  Progress text rendered in the progress bar. You can change this parameter's value.

Type:

EventBase<SurveyModel, GetProgressTextEvent>

Implemented in:

SurveyModel

See also:

showProgressBar * , progressBarLocation * , progressBarType

Use this event to change a question's display text.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.displayValue: any
  A question's display text. You can assign a custom value to this parameter.

Type:

EventBase<SurveyModel, GetQuestionDisplayValueEvent>

Implemented in:

SurveyModel

An event that is raised before the survey calculates a question number. Handle this event to modify question numbers.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.number: string
  A question number that is calculated based upon the question's visibleIndex and survey's questionStartIndex properties. You can change this parameter's value.

If you want to hide question numbers, disable the showQuestionNumbers property.

Type:

EventBase<SurveyModel, GetQuestionNumberEvent>

Implemented in:

SurveyModel

See also:

onGetQuestionTitle * , questionStartIndex

An event that is raised before the survey displays a question title. Handle this event to modify question titles.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.title: string
  A question title taken from the question's title or name property. You can change this parameter's value.

If you want to modify question numbers, handle the onGetQuestionNumber event.

Type:

EventBase<SurveyModel, GetQuestionTitleEvent>

Implemented in:

SurveyModel

See also:

requiredMark

An event that allows you to add, delete, or modify actions in a question title.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.actions: IAction[]
  An array of actions associated with the processed element.

View Demo

Type:

EventBase<SurveyModel, GetQuestionTitleActionsEvent>

Implemented in:

SurveyModel

See also:

IAction

An event that is raised when the survey applies HTML tags to a survey, page, panel, and question title. Handle this event to change the HTML tag of individual titles.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.element: Base
  A survey element (question, panel, page, or the survey itself) for which the event is raised.
• options.tagName: string
  An HTML tag used to render the title ("div"). You can change this parameter's value.

If you want to specify HTML tags for all titles, use the titleTags object in global settings.

View Demo

Type:

EventBase<SurveyModel, GetTitleTagNameEvent>

Implemented in:

SurveyModel

See also:

onGetQuestionTitle * , onGetQuestionNumber

An event that is raised when an ItemValue property is changed.

Parameters:

• sender: this
  A SurveyJS object whose property contains an array of ItemValue objects.
• options.obj: ItemValue
  An ItemValue object.
• options.propertyName: string
  The name of the property to which an array of ItemValue objects is assigned (for example, "choices" or "rows").
• options.name: "text" | "value"
  The name of the changed property.
• options.newValue: any
  A new value for the property.

Type:

Event<(sender: Base, options: any) => any, Base, any>

Implemented in:

Base

An event that is raised after a cell in a Multi-Select Matrix or Dynamic Matrix is created.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.column: MatrixDropdownColumn
  A matrix column to which the cell belongs.
• options.columnName: string
  The name of the matrix column to which the cell belongs.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.rowValue: any
  The values of this matrix row.
  To access a particular column's value, use the following code: options.rowValue["columnName"]
• options.cell: MatrixDropdownCell
  A matrix cell for which the event is raised.
• options.cellQuestion: Question
  A Question instance within the matrix cell. You can use the properties and methods exposed by the instance to customize it.

Type:

EventBase<SurveyModel, MatrixCellCreatedEvent>

Implemented in:

SurveyModel

See also:

onAfterRenderMatrixCell

An event that is raised before a cell in a Multi-Select Matrix or Dynamic Matrix is created. Use this event to change the type of individual matrix cells.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.column: MatrixDropdownColumn
  A matrix column to which the cell belongs.
• options.columnName: string
  The name of the matrix column to which the cell belongs.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.rowValue: any
  The values of this matrix row.
  To access a particular column's value, use the following code: options.rowValue["columnName"]
• options.cellType: string
  The type of this matrix cell. You can change this property value to one of the values described in the cellType documentation.

Type:

EventBase<SurveyModel, MatrixCellCreatingEvent>

Implemented in:

SurveyModel

See also:

onAfterRenderMatrixCell

An event that is raised for Multi-Select Matrix and Dynamic Matrix questions when they validate a cell value. Use this event to display a custom error message based on a condition.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.column: MatrixDropdownColumn
  A matrix column to which the cell belongs.
• options.columnName: string
  The name of a matrix column to which the cell belongs.
• options.cellQuestion: Question
  A Question instance within the matrix cell. You can use the properties and methods exposed by the instance to customize it.
• options.getCellQuestion: (columnName: string) => Question
  A method that returns a Question instance within the matrix cell given a column name.
• options.value: any
  A new cell value.
• options.error: string
  A field for your custom error message. Default value: undefined.

Type:

EventBase<SurveyModel, MatrixCellValidateEvent>

Implemented in:

SurveyModel

See also:

onMatrixRowAdding

An event that is raised after a cell value is changed in a Multi-Select Matrix or Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.column: MatrixDropdownColumn
  A matrix column to which the cell belongs.
• options.columnName: string
  The name of a matrix column to which the cell belongs.
• options.cellQuestion: Question
  A Question instance within the matrix cell. You can use the properties and methods exposed by the instance to customize it.
• options.getCellQuestion: (columnName: string) => Question
  A method that returns a Question instance within the matrix cell given a column name.
• options.value: any
  A new cell value.

Type:

EventBase<SurveyModel, MatrixCellValueChangedEvent>

Implemented in:

SurveyModel

See also:

onMatrixRowAdding

An event that is raised before a cell value is changed in a Multi-Select Matrix or Dynamic Matrix. Use this event to change the cell value.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the cell belongs.
• options.column: MatrixDropdownColumn
  A matrix column to which the cell belongs.
• options.columnName: string
  The name of a matrix column to which the cell belongs.
• options.cellQuestion: Question
  A Question instance within the matrix cell. You can use the properties and methods exposed by the instance to customize it.
• options.getCellQuestion: (columnName: string) => Question
  A method that returns a Question instance within the matrix cell given a column name.
• options.value: any
  A new cell value.
• options.oldValue: any
  A previous cell value.

Type:

EventBase<SurveyModel, MatrixCellValueChangingEvent>

Implemented in:

SurveyModel

See also:

onMatrixRowAdding

An event that is raised after a new column is added to a Multi-Select Matrix or Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.column: any
  An added matrix column.

Type:

EventBase<SurveyModel, MatrixColumnAddedEvent>

Implemented in:

SurveyModel

An event that is raised after the visibility of an expandable detail section is changed. This event can be raised for Multi-Select and Dynamic Matrix questions.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDropdownModelBase
  A Multi-Select Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row to which the detail section belongs.
• options.rowIndex: number
  A zero-based row index.
• options.detailPanel: PanelModel
  A PanelModel that represents the detail section.
• options.visible: boolean
  Indicates whether the detail section is visible now.

Type:

EventBase<SurveyModel, MatrixDetailPanelVisibleChangedEvent>

Implemented in:

SurveyModel

An event that is raised before rendering the Remove button in a row of a Dynamic Matrix. Use this event to hide the Remove button for individual matrix rows.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDynamicModel
  A Dynamic Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row for which the event is raised.
• options.rowIndex: number
  A zero-based row index.
• options.allow: boolean
  A Boolean property that you can set to false if you want to hide the Remove button for this row.

Type:

EventBase<SurveyModel, MatrixAllowRemoveRowEvent>

Implemented in:

SurveyModel

See also:

onMatrixRowRemoving * , onMatrixRowRemoved

An event that is raised after a new row is added to a Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDynamicModel
  A Dynamic Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  An added matrix row.

Type:

EventBase<SurveyModel, MatrixRowAddedEvent>

Implemented in:

SurveyModel

An event that is raised before a new row is added to a Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDynamicModel
  A Dynamic Matrix question instance for which the event is raised.
• options.allow: boolean
  A Boolean property that you can set to false if you do not want to add the row.

Type:

EventBase<SurveyModel, MatrixBeforeRowAddedEvent>

Implemented in:

SurveyModel

An event that is raised after a row is deleted from a Dynamic Matrix.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDynamicModel
  A Dynamic Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A deleted matrix row.
• options.rowIndex: number
  A zero-based index of the deleted row.

Type:

EventBase<SurveyModel, MatrixRowRemovedEvent>

Implemented in:

SurveyModel

See also:

onMatrixRenderRemoveButton

An event that is raised before a row is deleted from a Dynamic Matrix. You can cancel row deletion and clear row data instead.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionMatrixDynamicModel
  A Dynamic Matrix question instance for which the event is raised.
• options.row: MatrixDropdownRowModelBase
  A matrix row to be deleted. If you want to clear row data, set the options.row.value property to undefined.
• options.rowIndex: number
  A zero-based index of the matrix row to be deleted.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel row deletion.

Type:

EventBase<SurveyModel, MatrixRowRemovingEvent>

Implemented in:

SurveyModel

See also:

onMatrixRenderRemoveButton

An event that is raised on adding a new item in Multiple Text question.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.item: any
  A new added item.

Type:

EventBase<SurveyModel, MultipleTextItemAddedEvent>

Implemented in:

SurveyModel

An event that is raised before the survey navigates to a specified URL. Use this event to change the URL or cancel the navigation.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel the navigation and show the complete page.
• options.url: string
  A URL to which respondents should be navigated. You can modify this parameter's value.

Type:

EventBase<SurveyModel, NavigateToUrlEvent>

Implemented in:

SurveyModel

See also:

navigateToUrl * , navigateToUrlOnCondition

An event that is raised when users open a drop-down menu.

This event can be raised for Single- and Multi-Select Dropdown questions, Rating Scale questions rendered as drop-down menus, and Multi-Select Matrix questions that contain columns of the "dropdown" or "tagbox" cellType. Handle this event to change the drop-down menu type for specific questions or device types.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A question for which the event is raised.
• options.deviceType: "mobile" | "tablet" | "desktop"
  A device type.
• options.hasTouchScreen: boolean
  A Boolean value that indicates whether the current device supports touch gestures.
• options.screenHeight: number
  The height of the device screen in pixels.
• options.screenWidth: number
  The width of the device screen in pixels.
• options.menuType: "popup" | "dropdown" | "overlay"
  A menu type to use for the question: a classic dropdown, a pop-up dialog, or an overlay window. You can modify this parameter's value.

Type:

EventBase<SurveyModel, OpenDropdownMenuEvent>

Implemented in:

SurveyModel

An event that is raised when a respondent opens a dialog window to select files.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.input: any
  A file input HTML element.
• options.element: Base
  A question for which this event is raised.
• options.elementType: string
  The type of the element passed as the options.element parameter.
  Possible values: any value returned from the getType() method.
• options.propertyName: string
  The name of the survey element property for which files are being selected.
• options.item: ItemValue
  A choice item for which the event is raised. This parameter has a value only when the dialog window is opened to select images for an Image Picker question.
• options.callback: (files: any[]) => void
  A callback function to which you should pass selected files.

Type:

EventBase<SurveyModel, OpenFileChooserEvent>

Implemented in:

SurveyModel

See also:

chooseFiles

An event that is raised when a new page is added to the survey.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.page: PageModel
  A Page instance for which the event is raised.

Type:

EventBase<SurveyModel, PageAddedEvent>

Implemented in:

SurveyModel

See also:

PanelModel

An event that is raised after page visibility is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.visible: boolean
  Indicates whether the element is visible now.
• options.page: PageModel
  A Page instance for which the event is raised.

Refer to the following help topic for information on how to implement conditional visibility: Conditional Visibility.

Type:

EventBase<SurveyModel, PageVisibleChangedEvent>

Implemented in:

SurveyModel

An event that is raised when a new panel is added to a page.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.page: PanelModelBase
  A page that nests the added element.
• options.parent: PanelModelBase
  The parent container (panel or page).
• options.index: number
  The element's index within the parent container (panel or page).
• options.name: string
  The question's name.

Type:

EventBase<SurveyModel, PanelAddedEvent>

Implemented in:

SurveyModel

An event that is raised after a panel is deleted from the survey.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.name: string
  The element's name.

Type:

EventBase<SurveyModel, PanelRemovedEvent>

Implemented in:

SurveyModel

An event that is raised after panel visibility is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.visible: boolean
  Indicates whether the element is visible now.
• options.panel: PanelModel
  A Panel instance for which the event is raised.

Refer to the following help topic for information on how to implement conditional visibility: Conditional Visibility.

Type:

EventBase<SurveyModel, PanelVisibleChangedEvent>

Implemented in:

SurveyModel

An event that is raised to save incomplete survey results. Enable the partialSendEnabled property for this event to occur.

For information on event handler parameters, refer to descriptions within the interface.

Alternatively, you can handle the onCurrentPageChanged and onValueChanged events, as shown in the following demo: Continue an Incomplete Survey.

Type:

EventBase<SurveyModel, {}>

Implemented in:

SurveyModel

An event that is raised after the visibility of a popup is changed.

This event can be raised for Single- and Multi-Select Dropdown questions and Rating Scale questions rendered as drop-down menus, and Multi-Select Matrix questions that contain columns of the "dropdown" or "tagbox" cellType.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.popup: PopupModel<any>
  An object that describes the popup.
• options.visible: boolean
  Indicates whether the popup is visible now.

Type:

EventBase<SurveyModel, PopupVisibleChangedEvent>

Implemented in:

SurveyModel

An event that is raised when the survey processes dynamic texts and any text in curly brackets. Use this event, for instance, to substitute parameters in a RESTful URL with real values when you load choices by URL.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.name: string
  The name of the value being processed (the text in curly brackets).
• options.value: any
  The value being processed. You can change this parameter's value.

Type:

EventBase<SurveyModel, ProcessDynamicTextEvent>

Implemented in:

SurveyModel

An event that is raised when the survey processes HTML content. Handle this event to modify HTML content before displaying.

View Demo

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.html: string
  HTML markup. You can modify this parameter's value.
• options.reason: string
  Indicates a page, question, or message for which HTML content is intended: "completed" | "completed-before" | "loading" | "html-question".

Type:

EventBase<SurveyModel, ProcessHtmlEvent>

Implemented in:

SurveyModel

See also:

completedHtml * , loadingHtml * , QuestionHtmlModel.html

An event that is raised when a property of this SurveyJS object has changed.

Parameters:

• sender: this
  A SurveyJS object whose property has changed.
• options.name: string
  The name of the changed property.
• options.newValue: any
  A new value for the property.
• options.oldValue: any
  An old value of the property. If the property is an array, oldValue contains the same array as newValue does.

If you need to add and remove property change event handlers dynamically, use the registerPropertyChangedHandlers and unregisterPropertyChangedHandlers methods instead.

Type:

EventBase<Base, any>

Implemented in:

Base

An event that is raised when a new question is added to a panel or page.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.page: PanelModelBase
  A page that nests the added element.
• options.parent: PanelModelBase
  The parent container (panel or page).
• options.index: number
  The element's index within the parent container (panel or page).
• options.name: string
  The question's name.

To use this event for questions loaded from JSON, create an empty survey model, add an event handler, and only then populate the model from the JSON object:

import { Model } from "survey-core";

const surveyJson = {
   // ...
};
// Create an empty model
const survey = new Model();
// Add an event handler
survey.onQuestionAdded.add((sender, options) => {
  //...
});
// Load the survey JSON schema
survey.fromJSON(surveyJson);

Type:

EventBase<SurveyModel, QuestionAddedEvent>

Implemented in:

SurveyModel

See also:

onQuestionCreated

An event that is raised when the survey creates any new object derived from Question.

In a survey, complex elements (Dynamic Matrix, Multiple Text, and Dynamic Panel) are composed of questions. Use this event to customize any question regardless of which survey element it belongs to.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.

To use this event for questions loaded from JSON, create an empty survey model, add an event handler, and only then populate the model from the JSON object:

import { Model } from "survey-core";

const surveyJson = {
   // ...
};
// Create an empty model
const survey = new Model();
// Add an event handler
survey.onQuestionCreated.add((sender, options) => {
  //...
});
// Load the survey JSON schema
survey.fromJSON(surveyJson);

Type:

EventBase<SurveyModel, QuestionCreatedEvent>

Implemented in:

SurveyModel

See also:

onQuestionAdded

An event that is raised after a question is deleted from the survey.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.name: string
  The element's name.

Type:

EventBase<SurveyModel, QuestionRemovedEvent>

Implemented in:

SurveyModel

An event that is raised after question visibility is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.visible: boolean
  Indicates whether the element is visible now.
• options.name: string
  The question's name.

Refer to the following help topic for information on how to implement conditional visibility: Conditional Visibility.

Type:

EventBase<SurveyModel, QuestionVisibleChangedEvent>

Implemented in:

SurveyModel

An event that is raised when the survey's width or height is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.width: number
  The current survey width in pixels.
• options.height: number
  The current survey height in pixels.

Type:

EventBase<SurveyModel, ResizeEvent>

Implemented in:

SurveyModel

An event this is raised before a survey element (usually page) is scrolled to the top. Use this event to cancel the scroll operation.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.element: ISurveyElement
  A survey element that will be scrolled to the top.
• options.elementId: string
  A unique element ID within the DOM.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel the scroll operation.

Type:

EventBase<SurveyModel, ScrollToTopEvent>

Implemented in:

SurveyModel

Use this event to validate data on your server.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.complete: () => void
  A method that you should call when a request to the server has completed.
• options.errors: { [index: string]: any; }
  An object for your error messages. Set error messages as follows: options.errors["questionName"] = "My error message".
• options.data: { [index: string]: any; }
  Question values. You can get an individual question value as follows: options.data["questionName"].

View Demo

Type:

EventBase<SurveyModel, ServerValidateQuestionsEvent>

Implemented in:

SurveyModel

See also:

onValidateQuestion * , onValidatePanel * , isValidatingOnServer

An event that is raised before a choice item is displayed. Use this event to change the visibility of individual choice items in Checkboxes, Dropdown, Radio Button Group, and other similar question types.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.item: ItemValue
  A choice item.
• options.visible: boolean
  A Boolean value that specifies item visibility. Set it to false to hide the item.

Type:

EventBase<SurveyModel, ShowingChoiceItemEvent>

Implemented in:

SurveyModel

An event that is raised before the survey displays a preview of given answers. Use this event to cancel the preview.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.allow: boolean
  A Boolean property that you can set to false if you want to cancel the preview.

Type:

EventBase<SurveyModel, ShowingPreviewEvent>

Implemented in:

SurveyModel

See also:

showPreviewBeforeComplete * , previewMode * , showPreview * , cancelPreview

An event that is raised when the survey state changes to "running".

For information on event handler parameters, refer to descriptions within the interface.

View Demo

Type:

EventBase<SurveyModel, {}>

Implemented in:

SurveyModel

See also:

firstPageIsStartPage

An event that is raised to convert Markdown content to HTML.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.element: Question | PanelModel | PageModel | SurveyModel
  A survey element (question, panel, page, or survey) for which the event is raised.
• options.name: string
  The name of the property that contains the text to process.
• options.item: ItemValue
  A choice item for which the event is raised. This parameter has a value only when options.element is a choice-based question, such as Dropdown or Checkboxes.
• options.text: string
  A string with Markdown content. Convert this content to HTML and assign the result to the options.html parameter.
• options.html: string
  A property to which you should assign HTML content.

View Demo

Type:

EventBase<SurveyModel, TextMarkdownEvent>

Implemented in:

SurveyModel

An event that is raised every second while the timer is running.

Use the timeSpent property to find out how many seconds have elapsed.

Type:

EventBase<SurveyModel, {}>

Implemented in:

SurveyModel

See also:

timeLimit * , timeLimitPerPage * , showTimer * , timerLocation * , startTimer

An event that is raised after a trigger is executed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.trigger: Trigger
  A trigger that has been executed.

Conditional Survey Logic (Triggers)

Type:

EventBase<SurveyModel, TriggerExecutedEvent>

Implemented in:

SurveyModel

See also:

triggers * , runTriggers

An event that is raised before rendering a choice item in Radio Button Group, Checkboxes and Rating Scale questions. Use it to override default CSS classes applied to choice items.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.item: ItemValue
  A choice item. To access its value and display text, use the options.item.value and options.item.text properties.
• options.css: string
  A string with CSS classes applied to the choice item. The CSS classes are separated by a space character. You can modify this string to apply custom CSS classes.

View Demo

Type:

EventBase<SurveyModel, UpdateChoiceItemCssEvent>

Implemented in:

SurveyModel

See also:

css

An event that is raised before rendering a page. Use it to override default page CSS classes.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.page: PageModel
  A Page instance for which the event is raised.
• options.cssClasses: any
  An object with CSS classes applied to the element being rendered, for example, { root: "class1", button: "class2" }. You can modify this object to apply custom CSS classes.

View Demo

Type:

EventBase<SurveyModel, UpdatePageCssClassesEvent>

Implemented in:

SurveyModel

See also:

css

An event that is raised before rendering a standalone panel and panels within Dynamic Panel. Use it to override default panel CSS classes.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.cssClasses: any
  An object with CSS classes applied to the element being rendered, for example, { root: "class1", button: "class2" }. You can modify this object to apply custom CSS classes.

View Demo

Type:

EventBase<SurveyModel, UpdatePanelCssClassesEvent>

Implemented in:

SurveyModel

See also:

css

An event that is raised before rendering a question. Use it to override default question CSS classes.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.cssClasses: any
  An object with CSS classes applied to the element being rendered, for example, { root: "class1", button: "class2" }. You can modify this object to apply custom CSS classes.

View Demo

Type:

EventBase<SurveyModel, UpdateQuestionCssClassesEvent>

Implemented in:

SurveyModel

See also:

css

An event that is raised when a File Upload or Signature Pad question starts to upload a file. Applies only if storeDataAsText is false. Use this event to upload files to your server.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: QuestionFileModel | QuestionSignaturePadModel
  A File Upload or Signature Pad question instance for which the event is raised.
• options.name: string
  A File Upload question's name.
• options.callback: (data: any, errors?: any) => any
  A callback function that you should call when a file is uploaded successfully or when file upload fails. Pass an array of successfully uploaded files as the first argument. As the second argument, you can pass an array of error messages if file upload failed.
• options.files: any[]
  An array of JavaScript File objects that represent files to upload.

File Upload Demo

Signature Pad Demo

Type:

EventBase<SurveyModel, UploadFilesEvent>

Implemented in:

SurveyModel

See also:

uploadFiles * , onDownloadFile * , onClearFiles

An event that is raised when a survey page is being validated. Use this event to add/remove/modify errors.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.page: PageModel
  A Page instance for which the event is raised.
• options.questions: Question[]
  An array of questions with validation errors.
• options.errors: SurveyError[]
  An array of validation errors.

Type:

EventBase<SurveyModel, ValidatePageEvent>

Implemented in:

SurveyModel

An event that is raised when a panel is being validated. Use this event to add/remove/modify errors or specify a custom error message.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.panel: PanelModel
  A Panel instance for which the event is raised.
• options.name: string
  The panel's name.
• options.error: string
  An error message that you should specify if custom validation fails.
• options.errors: SurveyError[]
  An array of other validation errors that you can modify.

View Demo

Type:

EventBase<SurveyModel, ValidatePanelEvent>

Implemented in:

SurveyModel

See also:

onValidateQuestion * , onServerValidateQuestions

An event that is raised when a question value is being validated. Use this event to add/remove/modify errors or specify a custom error message.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.value: any
  A question value being validated.
• options.name: string
  The question's name.
• options.error: string
  An error message that you should specify if custom validation fails.
• options.errors: SurveyError[]
  An array of other validation errors that you can modify. The array is empty if the validated question satisfies all validation rules.

View Demo

Type:

EventBase<SurveyModel, ValidateQuestionEvent>

Implemented in:

SurveyModel

See also:

onServerValidateQuestions * , onValidatePanel * , onMatrixCellValidate

An event that is raised after a question value is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.name: string
  The name of the question whose value is being changed. If you use the valueName property, this parameter contains its value.
• options.reason: "trigger" | "expression"
  A value that indicates what caused the value change: an expression evaluation or a run of a trigger. If the value is changed for other reasons, this parameter is undefined.
• options.value: any
  A new value.

View Demo

To handle value changes in matrix cells or panels within a Dynamic Panel, use the onMatrixCellValueChanged or onDynamicPanelValueChanged event.

Type:

EventBase<SurveyModel, ValueChangedEvent>

Implemented in:

SurveyModel

See also:

setValue

An event that is raised before a question value is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.question: Question
  A Question instance for which the event is raised.
• options.name: string
  The name of the question whose value is being changed. If you use the valueName property, this parameter contains its value.
• options.reason: "trigger" | "expression"
  A value that indicates what caused the value change: an expression evaluation or a run of a trigger. If the value is changed for other reasons, this parameter is undefined.
• options.value: any
  A new value. You can change it if required.
• options.oldValue: any
  A previous value.

Type:

EventBase<SurveyModel, ValueChangingEvent>

Implemented in:

SurveyModel

See also:

setValue

An event that is raised after a variable or calculated value is changed.

Parameters:

• sender: SurveyModel
  A survey instance that raised the event.
• options.value: any
  A new value for the variable or calculated value.
• options.name: string
  The name of the variable or calculated value that has been changed.

Type:

EventBase<SurveyModel, VariableChangedEvent>

Implemented in:

SurveyModel

See also:

setVariable * , calculatedValues

Returns a total number of survey pages.

To get the number of visible pages, use the visiblePageCount property.

Type:

number readonly

Implemented in:

SurveyModel

See also:

pages

Gets or sets a caption for the Next button.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

Localization & Globalization

Gets or sets a caption for the Previous button.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

Localization & Globalization

Returns an array of all pages in the survey.

To get an array of only visible pages, use the visiblePages array.

Type:

PageModel[] readonly

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

PageModel

Specifies whether to save survey results when respondents switch between pages. Handle the onPartialSend event to implement the save operation.

Alternatively, you can handle the onCurrentPageChanged and onValueChanged events, as shown in the following demo: Continue an Incomplete Survey.

Type:

boolean writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

Specifies whether the preview of given answers includes all or only answered questions.

Possible values:

• "allQuestions" (default)
• "answeredQuestions"

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

allQuestions

Accepted values:

allQuestions , answeredQuestions

Implemented in:

SurveyModel

Gets or sets a caption for the Preview button.

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Implemented in:

SurveyModel

See also:

showPreviewBeforeComplete * , showPreview * , editText

Switches the survey to the previous page.

This method returns a Boolean value that indicates whether the page was successfully switched. false is returned if the current page is the first page.

Type:

() => boolean

Return Value:

true if the page was successfully switched; false otherwise.

Implemented in:

SurveyModel

See also:

isFirstPage * , nextPage

Returns HTML content displayed to a user who has completed the survey before. To identify such users, the survey uses a cookie name.

To specify HTML content, use the completedBeforeHtml property.

Type:

string readonly

Implemented in:

SurveyModel

Returns HTML content displayed on the complete page.

To specify HTML content, use the completedHtml property.

Type:

string readonly

Implemented in:

SurveyModel

Returns HTML content displayed while a survey JSON schema is being loaded.

To specify HTML content, use the loadingHtml property.

Type:

string readonly

Implemented in:

SurveyModel

Specifies whether the progress bar spans the width of the survey or that of the survey container. Applies only when the progress bar is visible and progressBarType is "pages".

Possible values:

• "survey"
  The progress bar width is the same as the survey width.
• "container" (default)
  The progress bar width is the same as the survey container width.

Type:

"survey" | "container" readonly

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

container

Accepted values:

container , survey

Implemented in:

SurveyModel

See also:

progressBarShowPageTitles * , progressBarShowPageNumbers

Specifies the alignment of the progress bar. Applies only if the showProgressBar property is true.

Possible values:

• "aboveHeader" - Displays the progress bar above the survey header.
• "belowHeader" - Displays the progress bar below the survey header.
• "bottom" - Displays the progress bar below survey content.
• "topBottom" - Displays the progress bar above and below survey content.
• "auto" (default) - Displays the progress bar below the survey header if the header has a background image or color. Otherwise, the progress bar is displayed above the header.

View Demo

Type:

string writable

This property is stored in the survey JSON definition and can be edited in the Survey Creator.

Default value:

auto

Accepted values:

auto , aboveheader , belowheader , bottom , topbottom