QuestionImageModel
A class that describes the Image question type. Unlike other question types, Image cannot have a title or value.
Inherited from the following class(es):
Properties
Methods
Specifies a value for the alt
attribute of the underlying <img>
element.
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- QuestionImageModel
Specifies when to clear the question value if the question becomes invisible.
Possible values:
"default"
(default) - Inherits the setting from the Survey'sclearInvisibleValues
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
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
Creates a new object that has the same type and properties as the current SurveyJS object.
- Type:
- () => Base
- Implemented in:
- Base
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
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
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
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
Specifies the type of content that the Image question displays.
Possible values:
"image"
- An image in one of the following formats: JPEG, GIF, PNG, APNG, SVG, BMP, ICO."video"
- A video in one of the following formats: MP4, MOV, WMV, FLV, AVI, MKV."youtube"
- A link to a YouTube video."auto"
(default) - Selects one of the above based on theimageLink
property.
- 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 , image , video , youtube
- Implemented in:
- QuestionImageModel
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
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
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.
- 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
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'squestionDescriptionLocation
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
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.
- 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
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 thequestionErrorLocation
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
Validation errors. Call the validate()
method to validate survey element data.
- Type:
- SurveyError[] writable
- Implemented in:
- SurveyElement
- See also:
- validate
Expands the survey element.
- Type:
- () => void
- Implemented in:
- SurveyElement
- See also:
- state * , toggleState * , collapse * , isCollapsed * , isExpanded
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
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 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
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
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
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
Returns the question type. Possible values:
- "boolean"
- "checkbox"
- "comment"
- "dropdown"
- "tagbox"
- "expression"
- "file"
- "html"
- "image"
- "imagepicker"
- "matrix"
- "matrixdropdown"
- "matrixdynamic"
- "multipletext"
- "panel"
- "paneldynamic"
- "radiogroup"
- "rating"
- "ranking"
- "signaturepad"
- "text"
- Type:
- () => string
- Implemented in:
- Question
Returns true
if the survey element has a description.
- Type:
- boolean readonly
- Implemented in:
- SurveyElementCore
- See also:
- description
Returns false
if the question has no input fields (HTML, Image, and similar question types).
- Type:
- boolean readonly
- Implemented in:
- Question
- See also:
- hasSingleInput
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
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
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
Specifies how to resize the image or video to fit it into its container.
Refer to the object-fit
CSS property description for information on accepted values.
- 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:
- QuestionImageModel
- See also:
- imageHeight * , imageWidth
Specifies the height of a container for the image or video. Accepts positive numbers and CSS values.
Default value: 150
Use the imageFit
property to specify how to fit the image or video into the container.
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Default value:
- 150
- Implemented in:
- QuestionImageModel
- See also:
- imageWidth * , imageFit
Specifies an image or video URL.
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- QuestionImageModel
- See also:
- contentMode
Specifies the width of a container for the image or video. Accepts positive numbers and CSS values.
Default value: 200
Use the imageFit
property to specify how to fit the image or video into the container.
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Default value:
- 200
- Implemented in:
- QuestionImageModel
- See also:
- imageHeight * , imageFit
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
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 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.
- Type:
- () => boolean
- Implemented in:
- Question
- See also:
- correctAnswer * , SurveyModel.getQuizQuestions
Returns true
if the survey element is collapsed.
- Type:
- boolean readonly
- Implemented in:
- SurveyElement
- See also:
- state * , toggleState * , collapse * , expand * , isExpanded
Returns true
if the survey is being designed in Survey Creator.
- Type:
- boolean readonly
- Implemented in:
- Base
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
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
Returns true
if the survey element is a page.
- Type:
- boolean readonly
- Implemented in:
- SurveyElementCore
- See also:
- Base.getType
Returns true
if the survey element is a panel.
- Type:
- boolean readonly
- Implemented in:
- SurveyElementCore
- See also:
- Base.getType
Returns true
if a parent element (page or panel) is visible.
- Type:
- boolean readonly
- Implemented in:
- Question
Returns true
if the survey element is a question.
- Type:
- boolean readonly
- Implemented in:
- SurveyElementCore
- See also:
- Base.getType
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
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
Returns true
if the element is a survey.
- Type:
- boolean readonly
- Implemented in:
- SurveyElementCore
- See also:
- Base.getType
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. Passfalse
to disable this functionality.
- Implemented in:
- Base
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
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
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
A survey element identifier.
Question names must be unique.
- Type:
- string writable
- Implemented in:
- SurveyElement
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 ofItemValue
objects.options.obj
:ItemValue
AnItemValue
object.options.propertyName
:string
The name of the property to which an array ofItemValue
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 asnewValue
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
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
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
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
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
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
Returns the type of content that the Image question displays: "image"
, "video"
, or "youtube"
.
- Type:
- string readonly
- Implemented in:
- QuestionImageModel
- See also:
- contentMode
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
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
Returns a character or text string that indicates a required question.
- Type:
- string readonly
- Implemented in:
- Question
- See also:
- SurveyModel.requiredText * , isRequired
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.
- 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
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
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
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
.
- 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
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.
- 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
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
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
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
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 onlytitle
anddescription
and can be expanded in the UI.
- Type:
- string writable
- Implemented in:
- SurveyElement
- See also:
- toggleState * , collapse * , expand * , isCollapsed * , isExpanded
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
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 thequestionTitleLocation
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
Toggles the survey element's state
between collapsed and expanded.
- Type:
- () => boolean
- Implemented in:
- SurveyElement
- See also:
- state * , collapse * , expand * , isCollapsed * , isExpanded
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:
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
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
Question validators.
- Type:
- SurveyValidator[] writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- Question
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
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
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
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
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
Sets survey element width in CSS values.
Default value: ""
- Type:
- string writable
- Implemented in:
- SurveyElement
- See also:
- minWidth * , maxWidth
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