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Documentation Docs

QuestionMatrixDynamicModel

A class that describes the Dynamic Matrix question type.

Dynamic Matrix allows respondents to add and delete matrix rows. You can use the Dropdown, Checkbox, Radiogroup, Text, and Comment question types as cell editors.

View Demo

Inherited from the following class(es):

addRow method

Creates and adds a new row to the matrix.

Type:
(setFocus?: boolean) => void
Parameters:
setFocus, type: boolean ,

(Optional) Pass true to focus the cell in the first column.

Implemented in:
QuestionMatrixDynamicModel
addRowLocation property

Specifies the location of the Add Row button.

Possible values:

  • "top" - Displays the Add Row button at the top of the matrix.
  • "bottom" - Displays the Add Row button at the bottom of the matrix.
  • "topBottom" - Displays the Add Row button at the top and bottom of the matrix.

Default value: "top" if transposeData is true; "bottom" if transposeData is false or the matrix is in compact mode.

Type:
string writable

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

Default value:
default
Accepted values:
default , top , bottom , topBottom
Implemented in:
QuestionMatrixDynamicModel
See also:
addRowText
addRowText property

A caption for the Add Row button.

Type:
string writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
addRowLocation
allowAddRows property

Specifies whether users are allowed to add new rows.

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:
QuestionMatrixDynamicModel
See also:
canAddRow * , allowRemoveRows
allowRemoveRows property

Specifies whether users are allowed to delete rows.

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:
QuestionMatrixDynamicModel
See also:
canRemoveRows * , allowAddRows

Specifies whether users can drag and drop matrix rows to reorder them. Applies only if transposeData is false.

Default value: false

Type:
boolean writable

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

Implemented in:
QuestionMatrixDynamicModel
alternateRows property

Specifies whether to apply shading to alternate matrix rows.

Type:
boolean readonly

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

Implemented in:
QuestionMatrixBaseModel
canAddRow property

Indicates whether it is possible to add a new row.

This property returns true when all of the following conditions apply:

  • Users are allowed to add new rows (allowAddRows is true).
  • The question, its parent panel, or survey is not in read-only state.
  • rowCount is less than maxRowCount.
Type:
boolean readonly
Implemented in:
QuestionMatrixDynamicModel
See also:
allowAddRows * , isReadOnly * , rowCount * , maxRowCount * , canRemoveRows
canRemoveRows property

Indicates whether it is possible to delete rows.

This property returns true when all of the following conditions apply:

  • Users are allowed to delete rows (allowRemoveRows is true).
  • The question, its parent panel, or survey is not in read-only state.
  • rowCount exceeds minRowCount.
Type:
boolean readonly
Implemented in:
QuestionMatrixDynamicModel
See also:
allowRemoveRows * , isReadOnly * , rowCount * , minRowCount * , canAddRow

Specifies the error message position relative to matrix cells.

Possible values:

  • "default" (default) - Inherits the setting from the errorLocation property.
  • "top" - Displays error messages above matrix cells.
  • "bottom" - Displays error messages below matrix cells.
Type:
string writable

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

Default value:
default
Accepted values:
default , top , bottom
Implemented in:
QuestionMatrixDropdownModelBase
See also:
detailErrorLocation
cellType property

Specifies the type of matrix cells. You can override this property for individual columns.

Possible values:

Default value: "dropdown" (inherited from settings.matrix.defaultCellType)

Type:
string writable

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

Default value:
dropdown
Accepted values:
dropdown , checkbox , radiogroup , tagbox , text , comment , boolean , expression , rating
Implemented in:
QuestionMatrixDropdownModelBase
choices property

Gets or sets choice items for Dropdown, Checkbox, and Radiogroup matrix cells. You can override this property for individual columns.

This property accepts an array of objects with the following structure:

{
  "value": any, // A value to be saved in survey results
  "text": String, // A display text. This property supports Markdown. When `text` is undefined, `value` is used.
  "customProperty": any // Any property that you find useful.
}

To enable Markdown support for the text property, implement Markdown-to-HTML conversion in the onTextMarkdown event handler. For an example, refer to the following demo: Convert Markdown to HTML with markdown-it.

If you add custom properties, refer to the following help topic to learn how to serialize them into JSON: Add Custom Properties to Property Grid.

If you need to specify only the value property, you can set the choices property to an array of primitive values, for example, [ "item1", "item2", "item3" ]. These values are both saved in survey results and used as display text.

Type:
any[] writable

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

Default value:
[]
Implemented in:
QuestionMatrixDropdownModelBase
See also:
cellType
clearErrors method

Empties the errors array.

Type:
() => void
Implemented in:
Question
See also:
errors
clearIfInvisible property

Specifies when to clear the question value if the question becomes invisible.

Possible values:

  • "default" (default) - Inherits the setting from the Survey's clearInvisibleValues property.
  • "onHidden" - Clears the value when the question becomes invisible. If a question is invisible on startup and has an initial value, this value will be cleared when the survey is complete.
  • "onHiddenContainer" - Clears the value when the question or its container (page or panel) becomes invisible. If a question is invisible on startup and has an initial value, this value will be cleared when the survey is complete.
  • "onComplete" - Clears the value when the survey is complete.
  • "none" - Never clears the value of an invisible question.
Type:
string writable

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

Default value:
default
Accepted values:
default , none , onComplete , onHidden , onHiddenContainer
Implemented in:
Question
See also:
SurveyModel.clearInvisibleValues * , visible * , SurveyModel.onComplete

Removes values that cannot be assigned to this 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:
() => void
Implemented in:
Question
See also:
validate
clearValue method

Sets the question's value and comment properties to undefined.

Type:
(keepComment?: boolean) => void
Parameters:
keepComment, type: boolean
Implemented in:
Question
See also:
value * , comment
clone method

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

Type:
() => Base
Implemented in:
Base
collapse method

Collapses the survey element.

In collapsed state, the element displays only title and description.

Type:
() => void
Implemented in:
SurveyElement
See also:
title * , description * , state * , toggleState * , expand * , isCollapsed * , isExpanded
columnColCount property

Specifies the number of columns in Radiogroup and Checkbox cells.

Default value: 0 (the number of columns is selected automatically based on the available column width)

Type:
number writable

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

Accepted values:
0 , 1 , 2 , 3 , 4
Implemented in:
QuestionMatrixDropdownModelBase
See also:
cellType
columnLayout property

This property is obsolete. Use the transposeData property instead.

Type:
string writable

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

Accepted values:
horizontal , vertical
Implemented in:
QuestionMatrixDropdownModelBase
columnMinWidth property

Minimum column width in CSS values.

Type:
string writable

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

Implemented in:
QuestionMatrixBaseModel
See also:
width
columns property

An array of matrix columns.

For a Single-Select Matrix, the columns array can contain configuration objects with the text (display value) and value (value to be saved in survey results) properties. Alternatively, the array can contain primitive values that will be used as both the display values and values to be saved in survey results.

View "Single-Select Matrix" Demo

For a Multi-Select Matrix or Dynamic Matrix, the columns array should contain configuration objects with properties described in the MatrixDropdownColumn API Reference section.

View "Multi-Select Matrix" Demo

Type:
any[] writable
Implemented in:
QuestionMatrixBaseModel
columnsVisibleIf property

A Boolean expression that is evaluated against each matrix column. If the expression evaluates to false, the column becomes hidden.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

Use the {item} placeholder to reference the current column in the expression.

Refer to the following help topic for more information: Conditional Visibility.

Type:
string writable

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

Implemented in:
QuestionMatrixBaseModel
See also:
rowsVisibleIf
comment property

A comment to the selected question value. Enable the showCommentArea property to allow users to leave comments.

Type:
string writable
Implemented in:
Question
See also:
showCommentArea * , commentText

A placeholder for the comment area. Applies when the showCommentArea property is true.

Type:
string writable

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

Implemented in:
Question
See also:
showCommentArea * , comment * , commentText
commentText property

Specifies a caption displayed above the comment area. Applies when the showCommentArea property is true.

Type:
string writable

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

Implemented in:
Question
See also:
showCommentArea * , comment
confirmDelete property

Specifies whether to display a confirmation dialog when a respondent wants to delete a row.

Default value: false

Type:
boolean writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
confirmDeleteText

A message displayed in a confirmation dialog that appears when a respondent wants to delete a row.

Type:
string writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
confirmDelete
containsErrors property

Returns true if the survey element or its child elements have validation errors.

This property contains the result of the most recent validation. This result may be outdated. Call the validate method to get an up-to-date value.

Type:
boolean readonly
Implemented in:
SurveyElement
See also:
errors
correctAnswer property

A correct answer to this question. Specify this property if you want to create a quiz.

Type:
any writable

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

Implemented in:
Question
See also:
SurveyModel.getCorrectAnswerCount * , SurveyModel.getInCorrectAnswerCount
cssClasses property

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

Use the following events of the SurveyModel object to override CSS classes:

Type:
any readonly
Implemented in:
SurveyElement
defaultRowValue property

If it is not empty, then this value is set to every new row, including rows created initially, unless the defaultValue is not empty

Type:
any writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
defaultValue * , defaultValueFromLastRow
defaultValue property

A default value for the question. Ignored for question types that cannot have a value (for example, HTML).

The default value is used as a question value in the following cases:

  • While the survey is being loaded from JSON.
  • The question is just added to the survey and does not yet have an answer.
  • The respondent left the answer empty.
Type:
any writable

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

Implemented in:
Question
See also:
defaultValueExpression

An expression used to calculate the defaultValue.

This expression applies until the question value is specified by an end user or programmatically.

An expression can reference other questions as follows:

  • {other_question_name}
  • {panel.other_question_name} (to access questions inside the same dynamic panel)
  • {row.other_question_name} (to access questions inside the same dynamic matrix or multi-column dropdown)

An expression can also include built-in and custom functions for advanced calculations. For example, if the defaultValue should be today's date, set the defaultValueExpression to "today()", and the corresponding built-in function will be executed each time the survey is loaded. Refer to the following help topic for more information: Built-In Functions.

View Demo

Type:
any writable

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

Implemented in:
Question
See also:
defaultValue * , setValueExpression

Specifies whether default values for a new row/column should be copied from the last row/column.

If you also specify defaultValue, it will be merged with the copied values.

Type:
boolean writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
defaultValue
description property

Explanatory text displayed under the title.

Type:
string writable
Implemented in:
SurveyElementCore
See also:
hasDescription

Specifies where to display a question description.

Possible values:

  • "default" (default) - Inherits the setting from the Survey's questionDescriptionLocation property.
  • "underTitle" - Displays the description under the question title.
  • "underInput" - Displays the description under the interactive area.
Type:
string writable

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

Default value:
default
Accepted values:
default , underInput , underTitle
Implemented in:
Question
See also:
description * , hasDescription
detailElements property

An array of survey elements (questions and panels) to be displayed in detail sections.

Detail sections are expandable panels displayed under each matrix row. You can use them to display questions that do not fit into the row.

Set the detailPanelMode property to "underRow" or "underRowSingle" to display detail sections.

Type:
IElement[] readonly

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

Implemented in:
QuestionMatrixDropdownModelBase
See also:
detailPanelMode * , detailPanel

Specifies the error message position for questions within detail sections.

Possible values:

  • "default" (default) - Inherits the setting from the errorLocation property.
  • "top" - Displays error messages above questions.
  • "bottom" - Displays error messages below questions.
Type:
string writable

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

Default value:
default
Accepted values:
default , top , bottom
Implemented in:
QuestionMatrixDropdownModelBase
See also:
cellErrorLocation
detailPanel property

Contains a PanelModel instance that represents a detail section template.

Type:
PanelModel readonly
Implemented in:
QuestionMatrixDropdownModelBase
See also:
detailElements * , detailPanelMode
detailPanelMode property

Specifies the location of detail sections.

Possible values:

  • "underRow" - Displays detail sections under their respective rows. Users can expand any number of detail sections.
  • "underRowSingle" - Displays detail sections under their respective rows, but only one detail section can be expanded at a time.
  • "none" (default) - Hides detail sections.

Use the detailElements property to specify content of detail sections.

Type:
string writable

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

Default value:
none
Accepted values:
none , underRow , underRowSingle
Implemented in:
QuestionMatrixDropdownModelBase
See also:
detailElements * , detailPanel

Specifies whether to expand the detail section immediately when a respondent adds a new row.

Type:
boolean writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
detailPanelMode
displayMode property

Specifies how to arrange matrix questions.

Possible values:

  • "table" - Displays matrix questions in a table.
  • "list" - Displays matrix questions one under another as a list.
  • "auto" (default) - Uses the "table" mode if the survey has sufficient width to fit the table or the "list" mode otherwise.
Type:
"auto" | "list" | "table" readonly

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

Default value:
auto
Accepted values:
auto , table , list
Implemented in:
QuestionMatrixBaseModel
emptyRowsText property

A message displayed when the matrix does not contain any rows. Applies only if hideColumnsIfEmpty is enabled.

Type:
string writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
hideColumnsIfEmpty
enableIf property

A Boolean expression. If it evaluates to false, this question becomes read-only.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

Refer to the following help topic for more information: Conditional Visibility.

View Demo

Type:
string writable

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

Implemented in:
Question
See also:
readOnly * , isReadOnly
errorLocation property

Specifies the error message position. Overrides the questionErrorLocation property specified for the question's container (survey, page, or panel).

Possible values:

  • "default" (default) - Inherits the setting from the questionErrorLocation property specified for the question's container.
  • "top" - Displays error messages above questions.
  • "bottom" - Displays error messages below questions.
Type:
string writable

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

Default value:
default
Accepted values:
default , top , bottom
Implemented in:
Question
errors property

Validation errors. Call the validate() method to validate survey element data.

Type:
SurveyError[] writable
Implemented in:
SurveyElement
See also:
validate
expand method

Expands the survey element.

Type:
() => void
Implemented in:
SurveyElement
See also:
state * , toggleState * , collapse * , isCollapsed * , isExpanded
focus method

Moves focus to the input field of this question.

Type:
(onError?: boolean, scrollIfVisible?: boolean) => void
Parameters:
onError, type: boolean ,

Pass true if you want to focus an input field with the first validation error. Default value: false (focuses the first input field). Applies to question types with multiple input fields.

scrollIfVisible, type: boolean
Implemented in:
Question
fromJSON method

Assigns a new configuration to the current SurveyJS object. This configuration is taken from a passed JSON object.

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

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

A JSON object with properties that you want to apply to the current SurveyJS object.

options, type: ILoadFromJSONOptions ,

An object with configuration options.

Implemented in:
Base
See also:
toJSON

Returns a matrix column with a given name or null if a column with this is not found.

Type:
(columnName: string) => MatrixDropdownColumn
Parameters:
columnName, type: string ,

A column name.

Implemented in:
QuestionMatrixDropdownModelBase

Returns a display text that corresponds to the question value. For example, if you call this method for a Dropdown question, it returns an item text instead of an item value.

Type:
(keysAsText: boolean, value?: any) => any
Parameters:
keysAsText, type: boolean ,

Applies when the question value is an object (in Matrix, Multiple Text, and similar questions). Pass true if not only values in the object should be display texts, but also keys. Default value: false.

value, type: any ,

Specify this parameter to get a display text for a specific value, not for the current question value. If the question value is an object, this parameter should be a similar object.

Implemented in:
Question
getLocale method

Returns the survey's locale.

If a default locale is used, this method returns an empty string. To get the applied locale in this case, use the following code:

import { surveyLocalization } from 'survey-core';
const defaultLocale = surveyLocalization.defaultLocale;
Type:
() => string
Implemented in:
SurveyElement
See also:
Localization & Globalization

Returns an array of questions nested within the current question. Use this method to obtain questions within Multiple Text, Dynamic Panel, and Matrix-like questions.

Type:
(visibleOnly?: boolean) => Question[]
Parameters:
visibleOnly, type: boolean ,

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

Return Value:

An array of nested questions.

Implemented in:
Question
getPlainData method

Returns the question value as an object in which the question name, title, value, and other parameters are stored as individual properties.

If the question can have more than one value (Matrix, Multiple Text), the 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.

Pass an object with the includeEmpty property set to false if you want to skip empty answers.

Type:
(options?: IPlainDataOptions) => IQuestionPlainData
Parameters:
options, type: IPlainDataOptions
Implemented in:
Question

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
getRowValue method

Returns an object with row values. If a row has no answers, this method returns an empty object.

Type:
(rowIndex: number) => any
Parameters:
rowIndex, type: number ,

A zero-based row index.

Implemented in:
QuestionMatrixDropdownModelBase
See also:
setRowValue

Returns title location calculated based on the question's titleLocation property and the questionTitleLocation property of the question's containers (survey, page, or panel).

Type:
() => string
Implemented in:
Question
See also:
titleLocation * , SurveyModel.questionTitleLocation
hasDescription property

Returns true if the survey element has a description.

Type:
boolean readonly
Implemented in:
SurveyElementCore
See also:
description
hasInput property

Returns false if the question has no input fields (HTML, Image, and similar question types).

Type:
boolean readonly
Implemented in:
Question
See also:
hasSingleInput
hasSingleInput property

Returns false if the question has no input fields (HTML, Image) or has multiple input fields (Matrix, Multiple Text).

Type:
boolean readonly
Implemented in:
Question
See also:
hasInput
hasTitle property

Returns false if the titleLocation property is set to "hidden" or if the question cannot have a title (for example, an HTML question).

If the title property is undefined or set to an empty string, the hasTitle property returns true, because the question uses its name as a title in this case.

Type:
boolean readonly
Implemented in:
Question
See also:
title * , titleLocation

Specifies whether to hide columns when the matrix does not contain any rows. If you enable this property, the matrix displays the emptyRowsText message and the Add Row button.

Default value: false

Type:
boolean writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
emptyRowsText
hideNumber property

Hides the question number from the title and excludes the question from numbering.

If you want to disable question numbering in the entire survey, set SurveyModel's showQuestionNumbers property to false.

Type:
boolean writable

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

Implemented in:
Question
See also:
SurveyModel.showQuestionNumbers
id property

A value to assign to the id attribute of the rendered HTML element. A default id is generated automatically.

Type:
string writable
Implemented in:
Question
indent property

Increases or decreases an indent of survey element content from the left edge. Accepts positive integer values and 0. Does not apply in the Default V2 theme.

Type:
number writable
Implemented in:
SurveyElement
See also:
rightIndent
inSurvey property

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
isAllowTitleLeft property

Returns true if the question can display its title to the left of the input field.

Type:
boolean readonly
Implemented in:
Question
See also:
titleLocation * , getTitleLocation * , hasTitle

Returns true if a question answer matches the correctAnswer property value.

View Demo

Type:
() => boolean
Implemented in:
Question
See also:
correctAnswer * , SurveyModel.getQuizQuestions
isCollapsed property

Returns true if the survey element is collapsed.

Type:
boolean readonly
Implemented in:
SurveyElement
See also:
state * , toggleState * , collapse * , expand * , isExpanded

Returns true if columns are placed in the horizontal direction and rows in the vertical direction.

To specify the layout, use the transposeData property. If you set it to true, the survey applies it only when the screen has enough space. Otherwise, the survey falls back to the original layout, but the transposeData property remains set to true. Unlike transposeData, the isColumnLayoutHorizontal property always indicates the current layout.

Type:
boolean readonly
Implemented in:
QuestionMatrixDropdownModelBase
See also:
transposeData

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
isDesignMode property

Returns true if the survey is being designed in Survey Creator.

Type:
boolean readonly
Implemented in:
Base
isEmpty method

Returns true if the question value is an empty string, array, or object or if it equals undefined or null.

Type:
() => boolean
Implemented in:
Question
isExpanded property

Returns true if the survey element is expanded.

Type:
boolean readonly
Implemented in:
SurveyElement
See also:
state * , toggleState * , collapse * , expand * , isCollapsed

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

Type:
boolean readonly
Implemented in:
Base
isPage property

Returns true if the survey element is a page.

Type:
boolean readonly
Implemented in:
SurveyElementCore
See also:
Base.getType
isPanel property

Returns true if the survey element is a panel.

Type:
boolean readonly
Implemented in:
SurveyElementCore
See also:
Base.getType
isParentVisible property

Returns true if a parent element (page or panel) is visible.

Type:
boolean readonly
Implemented in:
Question
isQuestion property

Returns true if the survey element is a question.

Type:
boolean readonly
Implemented in:
SurveyElementCore
See also:
Base.getType
isReadOnly property

Returns true if the survey element or its parent element is read-only.

If you want to switch a survey element to the read-only state based on a condition, specify the enableIf property. Refer to the following help topic for information: Conditional Visibility.

Type:
boolean readonly
Implemented in:
SurveyElement
See also:
readOnly
isRequired property

Makes the question required. If a respondent skips a required question, the survey displays a validation error.

Type:
boolean writable

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

Implemented in:
Question
See also:
requiredIf * , Data Validation
isSurvey property

Returns true if the element is a survey.

Type:
boolean readonly
Implemented in:
SurveyElementCore
See also:
Base.getType

Enables case-sensitive comparison in columns with the isUnique property set to true.

When this property is true, "ABC" and "abc" are considered different values.

Default value: false

Type:
boolean writable
Implemented in:
QuestionMatrixDropdownModelBase
See also:
keyDuplicationError
isValueEmpty method

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
isVisible property

Returns true if the question is visible or the survey is currently in design mode.

If you want to display or hide a question based on a condition, specify the visibleIf property. Refer to the following help topic for information: Conditional Visibility.

Type:
boolean readonly
Implemented in:
Question
See also:
visibleIf * , visible * , isParentVisible

An error message displayed when users enter a duplicate value into a column that accepts only unique values (isUnique is set to true or keyName is specified).

A default value for this property is taken from a localization dictionary. Refer to the following help topic for more information: Localization & Globalization.

Type:
string writable

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

Implemented in:
QuestionMatrixDropdownModelBase
See also:
isUniqueCaseSensitive
keyName property

Specifies a key column. Set this property to a column name, and the question will display keyDuplicationError if a user tries to enter a duplicate value in this column.

Type:
string writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
keyDuplicationError
maxRowCount property

A maximum number of rows in the matrix. Users cannot add new rows if rowCount equals maxRowCount.

Default value: 1000 (inherited from settings.matrix.maxRowCount)

Type:
number writable

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

Default value:
1000
Implemented in:
QuestionMatrixDynamicModel
See also:
rowCount * , minRowCount * , allowAddRows
maxWidth property

Gets or sets maximum survey element width in CSS values.

Default value: "100%" (taken from settings.maxWidth)

Type:
string writable
Implemented in:
SurveyElement
See also:
minWidth * , renderWidth * , width
minRowCount property

A minimum number of rows in the matrix. Users cannot delete rows if rowCount equals minRowCount.

Default value: 0

Type:
number writable

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

Implemented in:
QuestionMatrixDynamicModel
See also:
rowCount * , maxRowCount * , allowRemoveRows
minWidth property

Gets or sets minimum survey element width in CSS values.

Default value: "300px" (taken from settings.minWidth)

Type:
string writable
Implemented in:
SurveyElement
See also:
maxWidth * , renderWidth * , width
name property

A survey element identifier.

Question names must be unique.

Type:
string writable
Implemented in:
SurveyElement
no property

A question number or letter (depends on the questionStartIndex property of the question container (panel, page, or survey)).

When the question number, title, or the entire question is invisible, this property returns an empty string.

Type:
string readonly
Implemented in:
Question
See also:
SurveyModel.questionStartIndex * , hideNumber * , titleLocation * , visibleIf

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 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 the question's ready state has changed (expressions are evaluated, choices are loaded from a web resource specified by the choicesByUrl property, etc.).

Parameters:

  • sender: SurveyModel
    A survey instance that contains the question whose ready state has changed.
  • options.isReady: boolean
    Indicates whether the question is ready.
  • options.oldIsReady: boolean
    Indicates the previous ready state.
Type:
EventBase<Question, any>
Implemented in:
Question
page property

Returns a page to which the question belongs and allows you to move this question to a different page.

Type:
IPage writable

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

Implemented in:
Question
parent property

Returns a survey element (panel or page) that contains the question and allows you to move this question to a different survey element.

Type:
IPanel writable
Implemented in:
Question
parentQuestion property

A Dynamic Panel, Dynamic Matrix, or Dropdown Matrix that includes the current question.

This property is null for standalone questions.

Type:
E readonly
Implemented in:
SurveyElement
placeholder property

A placeholder for Dropdown matrix cells.

Type:
string writable

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

Implemented in:
QuestionMatrixDropdownModelBase
See also:
cellType

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

Type:
number readonly
Implemented in:
Question
See also:
Create a Quiz , correctAnswer * , SurveyModel.getQuizQuestions
readOnly property

Makes the survey element read-only.

If you want to switch a survey element to the read-only state based on a condition, specify the enableIf property. Refer to the following help topic for information: Conditional Visibility.

Type:
boolean writable
Implemented in:
SurveyElement
See also:
isReadOnly

Registers a single value change handler for one or multiple properties.

The registerPropertyChangedHandlers and unregisterPropertyChangedHandlers methods allow you to manage property change event handlers dynamically. If you only need to attach an event handler without removing it afterwards, you can use the onPropertyChanged event instead.

Type:
(propertyNames: string[], handler: any, key?: string) => void
Parameters:
propertyNames, type: string[] ,

An array of one or multiple property names.

handler, type: any ,

A function to call when one of the listed properties change. Accepts a new property value as an argument.

key, type: string ,

(Optional) A key that identifies the current registration. If a function for one of the properties is already registered with the same key, the function will be overwritten. You can also use the key to subsequently unregister handlers.

Implemented in:
Base
See also:
unregisterPropertyChangedHandlers
removeRow method

Removes a matrix row with a specified index.

Type:
(index: number, confirmDelete?: boolean, onRowRemoved?: () => void) => void
Parameters:
index, type: number ,

A zero-based row index.

confirmDelete, type: boolean ,

(Optional) A Boolean value that specifies whether to display a confirmation dialog. If you do not specify this parameter, the confirmDelete property value is used.

onRowRemoved, type: () => void
Implemented in:
QuestionMatrixDynamicModel
removeRowText property

Use this property to change the default value of remove row button text.

Type:
string writable

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

Implemented in:
QuestionMatrixDynamicModel
renderWidth property

Returns a calculated width of the rendered survey element in CSS values.

Type:
string writable
Implemented in:
SurveyElement
See also:
width * , minWidth * , maxWidth

Specifies a custom error message for a required form field.

Type:
string writable

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

Implemented in:
Question
See also:
isRequired
requiredIf property

A Boolean expression. If it evaluates to true, this question becomes required.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

Refer to the following help topic for more information: Conditional Visibility.

Type:
string writable

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

Implemented in:
Question
See also:
isRequired
requiredText property

Returns a character or text string that indicates a required question.

Type:
string readonly
Implemented in:
Question
See also:
SurveyModel.requiredText * , isRequired
resetValueIf property

A Boolean expression. If it evaluates to true, the question value is reset to default.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

View Demo

Type:
string writable

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

Implemented in:
Question
See also:
setValueIf
rightIndent property

Increases or decreases an indent of survey element content from the right edge. Accepts positive integer values and 0. Does not apply in the Default V2 theme.

Type:
number writable
Implemented in:
SurveyElement
See also:
indent
rowCount property

The number of rows in the matrix.

Type:
number writable

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

Default value:
2
Implemented in:
QuestionMatrixDynamicModel
See also:
minRowCount * , maxRowCount
rows property

An array of matrix rows.

This array can contain primitive values or objects with the text (display value) and value (value to be saved in survey results) properties.

View Demo

Type:
any[] writable
Implemented in:
QuestionMatrixBaseModel
rowsVisibleIf property

A Boolean expression that is evaluated against each matrix row. If the expression evaluates to false, the row becomes hidden.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

Use the {item} placeholder to reference the current row in the expression.

Refer to the following help topic for more information: Conditional Visibility.

Type:
string writable

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

Implemented in:
QuestionMatrixBaseModel
See also:
visibleRows * , columnsVisibleIf
rowTitleWidth property

A width for the column that displays row titles (first column). Accepts CSS values.

Type:
string writable
Implemented in:
QuestionMatrixBaseModel

Assigns a new value to a specified property.

Type:
(name: string, val: any) => void
Parameters:
name, type: string ,

A property name.

val, type: any ,

A new value for the property.

Implemented in:
Base
setRowValue method

Assigns values to a row.

Type:
(rowIndex: number, rowValue: any) => any
Parameters:
rowIndex, type: number ,

A zero-based row index.

rowValue, type: any ,

An object with the following structure: { "column_name": columnValue, ... }

Implemented in:
QuestionMatrixDropdownModelBase
See also:
getRowValue

An expression used to calculate the question value.

You can use setValueExpression as a standalone property or in conjunction with the setValueIf expression, in which case the calculated question value applies only when setValueIf evaluates to true.

View Demo

Type:
string writable

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

Implemented in:
Question
See also:
defaultValueExpression * , resetValueIf
setValueIf property

A Boolean expression. If it evaluates to true, the question value is set to a value calculated using the setValueExpression.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

View Demo

Type:
string writable

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

Implemented in:
Question
See also:
resetValueIf
showCommentArea property

Specifies whether to display a comment area. Incompatible with the showOtherItem property.

Type:
boolean writable

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

Implemented in:
Question
See also:
comment * , commentText * , showOtherItem
showHeader property

Specifies whether to display the table header that contains column captions.

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:
QuestionMatrixBaseModel
showOtherItem property

Specifies whether to display the "Other" choice item. Incompatible with the showCommentArea property.

Type:
boolean writable
Implemented in:
Question
See also:
otherText * , otherItem * , otherErrorText * , showCommentArea * , settings.specialChoicesOrder
startWithNewLine property

Disable this property if you want to render the current question on the same line or row with the previous question or panel.

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:
Question
state property

Gets and sets the survey element's expand state.

Possible values:

  • "default" (default) - The survey element is displayed in full and cannot be collapsed in the UI.
  • "expanded" - The survey element is displayed in full and can be collapsed in the UI.
  • "collapsed" - The survey element displays only title and description and can be expanded in the UI.
Type:
string writable
Implemented in:
SurveyElement
See also:
toggleState * , collapse * , expand * , isCollapsed * , isExpanded
survey property

Returns the survey object.

Type:
ISurvey readonly
Implemented in:
SurveyElement
title property

A title for the survey element. If title is undefined, the name property value is displayed instead.

Empty pages and panels do not display their titles or names.

Type:
string writable
Implemented in:
SurveyElementCore
See also:
Configure Question Titles
titleLocation property

Sets question title location relative to the input field. Overrides the questionTitleLocation property specified for the question's container (survey, page, or panel).

Possible values:

  • "default" (default) - Inherits the setting from the questionTitleLocation property specified for the question's container.
  • "top" - Displays the title above the input field.
  • "bottom" - Displays the title below the input field.
  • "left" - Displays the title to the left of the input field.
  • "hidden" - Hides the question title.

Certain question types (Matrix, Multiple Text) do not support the "left" value. For them, the "top" value is used.

Type:
string writable

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

Default value:
default
Accepted values:
default , top , bottom , left , hidden
Implemented in:
Question
See also:
SurveyModel.questionTitleLocation * , getTitleLocation * , isAllowTitleLeft
toggleState method

Toggles the survey element's state between collapsed and expanded.

Type:
() => boolean
Implemented in:
SurveyElement
See also:
state * , collapse * , expand * , isCollapsed * , isExpanded
toJSON method

Returns a JSON object that corresponds to the current SurveyJS object.

Type:
(options?: ISaveToJSONOptions) => any
Parameters:
options, type: ISaveToJSONOptions
Implemented in:
Base
See also:
fromJSON
transposeData property

Specifies whether to display columns as rows and rows as columns.

Default value: false

View Demo

Type:
boolean writable

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

Implemented in:
QuestionMatrixDropdownModelBase

Unregisters value change event handlers for the specified properties.

Type:
(propertyNames: string[], key?: string) => void
Parameters:
propertyNames, type: string[] ,

An array of one or multiple property names.

key, type: string ,

(Optional) A key of the registration that you want to cancel.

Implemented in:
Base
See also:
registerPropertyChangedHandlers

Specifies whether to use display names for question values in placeholders.

Default value: true

This property applies to questions whose values are defined as objects with the value and text properties (for example, choice items in Radiogroup, Checkbox, and Dropdown questions).

You can use question values as placeholders in the following places:

  • Survey element titles and descriptions
  • The html property of the HTML question

To use a question value as a placeholder, specify the question name in curly brackets: {questionName}. Refer to the following help topic for more information: Dynamic Texts - Question Values.

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:
Question
validate method

Validates this question and returns false if the validation fails.

Type:
(fireCallback?: boolean, rec?: any) => boolean
Parameters:
fireCallback, type: boolean ,

(Optional) Pass false if you do not want to show validation errors in the UI.

rec, type: any
Implemented in:
Question
See also:
Data Validation
validators property

Question validators.

Data Validation

Type:
SurveyValidator[] writable

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

Implemented in:
Question
value property

Gets or sets the question value.

The following table illustrates how the value type depends on the question type:

Question type Value type(s)
Checkboxes Array<string | number>
Dropdown string | number
Dynamic Matrix Array<object>
Dynamic Panel Array<object>
Expression string | number | boolean
File Upload File | Array<File>
HTML (no value)
Image (no value)
Image Picker Array<string | number>
Long Text string
Multi-Select Dropdown object
Multi-Select Matrix object
Multiple Textboxes Array<string>
Panel (no value)
Radio Button Group string | number
Ranking Array<string | number>
Rating Scale number | string
Signature string (base64-encoded image)
Single-Line Input string | number | Date
Single-Select Matrix object
Yes/No (Boolean) boolean | string
Type:
any writable
Implemented in:
Question
valueName property

Specifies an object property that should store the question value.

Refer to the Merge Question Values help topic for more information.

Type:
string writable

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

Implemented in:
Question
verticalAlign property

Aligns matrix cell content in the vertical direction.

Type:
"top" | "middle" readonly

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

Default value:
middle
Accepted values:
top , middle
Implemented in:
QuestionMatrixBaseModel
visible property

Gets or sets question visibility.

If you want to display or hide a question based on a condition, specify the visibleIf property. Refer to the following help topic for information: Conditional Visibility.

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:
Question
See also:
isVisible * , visibleIf
visibleIf property

A Boolean expression. If it evaluates to false, this question becomes hidden.

A survey parses and runs all expressions on startup. If any values used in the expression change, the survey re-evaluates it.

Refer to the following help topic for more information: Conditional Visibility.

Type:
string writable

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

Implemented in:
Question
See also:
visible * , isVisible
visibleIndex property

Returns the visible index of the question in the survey. It can be from 0 to all visible questions count - 1 The visibleIndex is -1 if the title is 'hidden' or hideNumber is true

Type:
number readonly
Implemented in:
Question
See also:
titleLocation * , hideNumber
visibleRows property

Returns an array of visible matrix rows.

Type:
TRow[] readonly
Implemented in:
QuestionMatrixBaseModel
See also:
rowsVisibleIf
width property

Sets survey element width in CSS values.

Default value: ""

Type:
string writable
Implemented in:
SurveyElement
See also:
minWidth * , maxWidth

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