Fatalfspan Number of Elements Parameter is Lessthanorequalto One Cant Continue

addElement method

Add an element into Panel or Page. Returns true if the element added successfully. Otherwise returns false.

Type:: (element: IElement, index?: number) => boolean

Parameters:: element , type: IElement

index , type: number ,

element index in the elements array

Implemented in:: PanelModelBase

addNewPanel method

Creates a new panel and adds it into the end of the elements list. Returns null, if the panel could not be created or could not be added into page or panel.

Type:: (name?: string) => PanelModel

Parameters:: name , type: string ,

a panel name

Implemented in:: PanelModelBase

addNewQuestion method

Creates a new question and adds it at location of index, by default the end of the elements list. Returns null, if the question could not be created or could not be added into page or panel.

Type:: (questionType: string, name?: string, index?: number) => Question

Parameters:: questionType , type: string ,

the possible values are: "text", "checkbox", "dropdown", "matrix", "html", "matrixdynamic", "matrixdropdown" and so on.

name , type: string ,

a question name

index , type: number ,

element index in the elements array

Implemented in:: PanelModelBase

addPanel method

Add a panel into Panel or Page. Returns true if the panel added successfully. Otherwise returns false.

Type:: (panel: PanelModel, index?: number) => boolean

Parameters:: panel , type: PanelModel

index , type: number ,

element index in the elements array

Implemented in:: PanelModelBase

addPanelsIntoList method

Fill list array with the panels.

Type:: (list: any, visibleOnly?: boolean, includingDesignTime?: boolean) => void

Parameters:

list , type: any

visibleOnly , type: boolean

includingDesignTime , type: boolean

Implemented in:: PanelModelBase

addQuestion method

Add a question into Panel or Page. Returns true if the question added successfully. Otherwise returns false.

Type:: (question: Question, index?: number) => boolean

Parameters:: question , type: Question

index , type: number ,

element index in the elements array

Implemented in:: PanelModelBase

addQuestionsToList method

Fill list array with the questions.

Type:: (list: any, visibleOnly?: boolean, includingDesignTime?: boolean) => void

Parameters:

list , type: any

visibleOnly , type: boolean ,

set it to true to get visible questions only

includingDesignTime , type: boolean

Implemented in:: PanelModelBase

allowAdaptiveActions property

The Panel toolbar gets adaptive if the property is set to 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:: PanelModel

clearErrors method

Call this function to clear all errors in the panel / page and all its child elements (panels and questions)

Type:: () => void

Implemented in:: PanelModelBase

clearIncorrectValues method

Call this function to remove all question values from the current page/panel, that end-user will not be able to enter. For example the value that doesn't exists in a radigroup/dropdown/checkbox choices or matrix rows/columns. Please note, this function doesn't clear values for invisible questions or values that doesn't associated with questions.

Type:: () => void

Implemented in:: PanelModelBase

See also:: Question.clearIncorrectValues

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

containsElement method

Returns true if the current element belongs to the Panel/Page. It looks in nested Panels as well.

Type:: (element: IElement) => boolean

Parameters:: element , type: IElement

Implemented in:: PanelModelBase

See also:: PanelModel

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 hasErrors method to get an up-to-date value.

Type:: boolean readonly

Implemented in:: SurveyElement

See also:: errors

cssClasses property

Type:: any readonly

Implemented in:: SurveyElement

description property

Explanatory text displayed under the title.

Type:: string writable

Implemented in:: SurveyElementCore

See also:: hasDescription

elements property

Returns the list of the elements in the object, Panel/Page. Elements can be questions or panels. The function doesn't return elements in the nested Panels.

Type:: any readonly

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

Implemented in:: PanelModelBase

enableIf property

An expression that returns true or false. If it returns false the Panel/Page becomes read only and an end-user will not able to answer on qustions inside it. The library runs the expression on survey start and on changing a question value. If the property is empty then readOnly property is used.

Type:: string writable

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

Implemented in:: PanelModelBase

See also:: readOnly * , isReadOnly

errors property

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

Type:: any writable

Implemented in:: SurveyElement

See also:: hasErrors

expand method

Expands the survey element.

Type:: () => void

Implemented in:: SurveyElement

See also:: state * , toggleState * , collapse * , isCollapsed * , isExpanded

focusFirstErrorQuestion method

Call it to focus the input of the first question that has an error.

Type:: () => void

Implemented in:: PanelModelBase

focusFirstQuestion method

Call it to focus the input on the first question

Type:: () => void

Implemented in:: PanelModelBase

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) => void

Parameters:: json , type: any ,

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

Implemented in:: Base

See also:: toJSON

getComments method

Returns question comments on the current page

Type:: () => any

Implemented in:: PanelModelBase

getDisplayValue method

Return questions values as a JSON object with display text. For example, for dropdown, it would return the item text instead of item value.

Type:: (keysAsText: boolean) => any

Parameters:: keysAsText , type: boolean ,

Set this value to true, to return key (in matrices questions) as display text as well.

Implemented in:: PanelModelBase

getElementByName method

Returns the element by its name. It works recursively.

Type:: (name: string) => IElement

Parameters:: name , type: string ,

the element name

Implemented in:: PanelModelBase

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

getPropertyByName method

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

getPropertyValue method

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) => 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.

Implemented in:: Base

getQuestionByName method

Returns the question by its name

Type:: (name: string) => Question

Parameters:: name , type: string ,

the question name

Implemented in:: PanelModelBase

getType method

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

Type:: () => string

Implemented in:: PanelModelBase

getValue method

Returns question values on the current page

Type:: () => any

Implemented in:: PanelModelBase

hasDescription property

Returns true if the survey element has a description.

Type:: boolean readonly

Implemented in:: SurveyElementCore

See also:: description

hasErrors method

Returns true, if there is an error on this Page or inside the current Panel

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

Parameters:: fireCallback , type: boolean ,

set it to true, to show errors in UI

focusOnFirstError , type: boolean ,

set it to true to focus on the first question that doesn't pass the validation

rec , type: any

Implemented in:: PanelModelBase

id property

A unique element identificator. It is generated automatically.

Type:: string writable

Implemented in:: PanelModelBase

indent property

Increases or decreases indent of the survey element content from the left edge. Accepts positive integer values and 0.

Type:: number writable

Implemented in:: SurveyElement

See also:: rightIndent

indexOf method

Returns the index of element parameter in the elements list.

Type:: (element: IElement) => number

Parameters:: element , type: IElement ,

question or panel

Implemented in:: PanelModelBase

innerIndent property

The inner indent. Set this property to increase the panel content margin.

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

Implemented in:: PanelModel

inSurvey property

Type:: boolean readonly

Implemented in:: Base

isActive property

Returns true if the current object is Page and it is the current page.

Type:: boolean readonly

Implemented in:: PanelModelBase

isCollapsed property

Returns true if the survey element is collapsed.

Type:: boolean readonly

Implemented in:: SurveyElement

See also:: state * , toggleState * , collapse * , expand * , isExpanded

isDescendantOf method

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.

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

isExpanded property

Returns true if the survey element is expanded.

Type:: boolean readonly

Implemented in:: SurveyElement

See also:: state * , toggleState * , collapse * , expand * , isCollapsed

isLoadingFromJson property

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:: SurveyElement

See also:: Base.getType

isPanel property

Returns true if the current object is Panel. Returns false if the current object is Page (a root Panel).

Type:: boolean readonly

Implemented in:: PanelModelBase

isQuestion property

Returns true if the survey element is a question.

Type:: boolean readonly

Implemented in:: SurveyElement

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

Set this property to true, to require the answer at least in one question in the panel.

Type:: boolean writable

Implemented in:: PanelModelBase

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 object is visible or survey is in design mode right now.

Type:: boolean readonly

Implemented in:: PanelModelBase

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

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.

Type:: string writable

Implemented in:: SurveyElement

no property

The property returns the question number. If question is invisible then it returns empty string. If visibleIndex is 1, then no is 2, or 'B' if survey.questionStartIndex is 'A'.

Type:: string readonly

Implemented in:: PanelModel

See also:: SurveyModel.questionStartIndex

onItemValuePropertyChanged event

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

Parameters:

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

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

Implemented in:: Base

onPropertyChanged event

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

Parameters:

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

Type:: EventBase<Base>

Implemented in:: Base

page property

Get/set the page where the panel is located.

Type:: IPage writable

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

Implemented in:: PanelModel

parent property

A parent element. It is always null for the Page object and always not null for the Panel object. Panel object may contain Questions and other Panels.

Type:: PanelModelBase writable

Implemented in:: PanelModelBase

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

processedTitle property

Returns rendered title text or html.

Type:: string readonly

Implemented in:: PanelModelBase

questions property

Returns the list of all questions located in the Panel/Page, including in the nested Panels.

Type:: any readonly

Implemented in:: PanelModelBase

See also:: Question * , elements

questionsOrder property

Use this property to randomize questions. Set it to 'random' to randomize questions, 'initial' to keep them in the same order or 'default' to use the Survey questionsOrder property

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 , initial , random

Implemented in:: PanelModelBase

See also:: SurveyModel.questionsOrder * , areQuestionsRandomized

questionStartIndex property

Gets or sets the first question index for elements inside the panel. The first question index is '1.' by default and it is taken from survey.questionStartIndex property. You may start it from '100' or from 'A', by setting '100' or 'A' to this property. You can set the start index to "(1)" or "# A)" or "a)" to render question number as (1), # A) and a) accordingly.

Type:: string writable

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

Implemented in:: PanelModel

See also:: survey.questionStartIndex

questionTitleLocation property

Set this property different from "default" to set the specific question title location for this panel/page.

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:: PanelModelBase

See also:: SurveyModel.questionTitleLocation

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

registerPropertyChangedHandlers method

Registers a function to call when a property value changes.

Type:: (propertyNames: any, handler: any, key?: string) => void

Parameters:: propertyNames , type: any ,

An array of one or multiple property names.

handler , type: any ,

A function to call when one of the listed properties change.

key , type: string ,

an optional parameter. If there is already a registered function for this property with the same key, it will be overwritten.

Implemented in:: Base

See also:: unregisterPropertyChangedHandlers

removeElement method

Remove an element (Panel or Question) from the elements list.

Type:: (element: IElement) => boolean

Parameters:: element , type: IElement

Implemented in:: PanelModelBase

See also:: elements

removeQuestion method

Remove question from the elements list.

Type:: (question: Question) => void

Parameters:: question , type: Question

Implemented in:: PanelModelBase

See also:: elements * , removeElement

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

requiredErrorText property

The custom text that will be shown on required error. Use this property, if you do not want to show the default text.

Type:: string writable

Implemented in:: PanelModelBase

requiredIf property

An expression that returns true or false. If it returns true the Panel/Page becomes required. The library runs the expression on survey start and on changing a question value. If the property is empty then isRequired property is used.

Type:: string writable

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

Implemented in:: PanelModelBase

See also:: isRequired

requiredText property

Returns the char/string for a required panel.

Type:: string readonly

Implemented in:: PanelModelBase

See also:: SurveyModel.requiredText

rightIndent property

Increases or decreases indent of the survey element content from the right edge. Accepts positive integer values and 0.

Type:: number writable

Implemented in:: SurveyElement

See also:: indent

setPropertyValue method

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

showNumber property

Set showNumber to true to start showing the number for this panel.

Type:: boolean writable

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

Implemented in:: PanelModel

See also:: visibleIndex

showQuestionNumbers property

Gets or sets a value that specifies how the elements numbers inside panel are displayed.

The following options are available:

default - display questions numbers as defined in parent panel or survey
onpanel - display questions numbers, start numbering from beginning of this page
off - turn off the numbering for questions titles

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 , onpanel , off

Implemented in:: PanelModel

See also:: showNumber

startWithNewLine property

The Panel renders on the new line if the property is true. If the property is false, the panel tries to render on the same line/row with a previous question/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:: PanelModel

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

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:: () => any

Implemented in:: Base

See also:: fromJSON

unregisterPropertyChangedHandlers method

Unregisters value change event handlers for the specified properties.

Type:: (propertyNames: any, key?: string) => void

Parameters:: propertyNames , type: any ,

An array of one or multiple property names.

key , type: string ,

the key with which you have registered the notification for this property. It can be null.

Implemented in:: Base

See also:: registerPropertyChangedHandlers

visible property

Use it to get/set the object 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:: PanelModelBase

See also:: visibleIf

visibleIf property

An expression that returns true or false. If it returns true the Panel becomes visible and if it returns false the Panel becomes invisible. The library runs the expression on survey start and on changing a question value. If the property is empty then visible property is used.

Type:: string writable

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

Implemented in:: PanelModelBase

See also:: visible

visibleIndex property

Returns the visible index of the panel in the survey. Commonly it is -1 and it doesn't show. You have to set showNumber to true to show index/numbering for the Panel

Type:: number readonly

Implemented in:: PanelModel

See also:: showNumber

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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Source: https://surveyjs.io/form-library/documentation/panelmodel

Fatalfspan Number of Elements Parameter is Lessthanorequalto One Cant Continue

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