Add error into the question error list.

The list of items. Every item has value and text. If text is empty, the value is rendered. The item text supports markdown.

Use this property to fill the choices from a restful service.

An expression that returns true or false. It runs against each choices item and if for this item it returns true, then the item is enabled otherwise the item becomes disabled. Please use to get the current item value in the expression.

Get is question ready to use

Use this property to render items in a specific order: "asc", "desc", "random". Default value is "none".

An expression that returns true or false. It runs against each choices item and if for this item it returns true, then the item is visible otherwise the item becomes invisible. Please use to get the current item value in the expression.

Call this function to clear all errors in the question

Call this function to remove values from the current question, 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.

If the clearIncorrectValuesCallback is set, it is used to clear incorrect values instead of default behaviour.

Make a clone of the existing object. Create a new object of the same type and load all properties into it.

The number of columns for radiogroup and checkbox questions. Items are rendred in one line if the value is 0.

The question comment value.

Use it to get or set the comment value.

Returns true if a question or a container (panel/page) or their chidren have an error. The value can be out of date. hasErrors function should be called to get the correct value.

The correct answer on the question. Set this value if you are doing a quiz. Please note, this property is hidden for question without input, for example html question.

Returns all css classes that used for rendering the question. You may use survey.updateQuestionCssClasses event to override css classes for a question.

Returns the validation errors count.

The link to the custom widget.

Set the default value to the question. It will be assign to the question on loading the survey from JSON or adding a question to the survey or on setting this property of the value is empty. Please note, this property is hidden for question without input, for example html question.

Question description. It renders under question title by using smaller font. Unlike the title, description can be empty. Please note, this property is hidden for questions without input, for example html question.

Question description location. By default, value is "default" and it depends on survey questionDescriptionLocation property You may change it to "underInput" to render it under question input or "underTitle" to rendered it under title.

The list of enabled items as they will be rendered. The disabled items are not included

An expression that returns true or false. If it returns false the Question becomes read only and an end-user will not able to answer on the qustion. The library runs the expression on survey start and on changing a question value. If the property is empty then readOnly property is used. Please note, this property is hidden for question without input, for example html question.

The list of errors. It is created by callig hasErrors functions

Move the focus to the input of this question.

Load object properties and elements. It doesn't reset properties that was changed before and they are not defined in the json parameter.

Returns the title after processing the question template.

Returns a copy of question errors survey. For some questions like matrix and panel dynamic it includes the errors of nested questions.

Return the question value as a display text. For example, for dropdown, it would return the item text instead of item value.

Returns the current survey locale

Returns question answer data as a plain object: with question title, name, value and displayValue. For complex questions (like matrix, etc.) isNode flag is set to true and data contains array of nested objects (rows) set options.includeEmpty to false if you want to skip empty answers

Returns the property value by name

Returns the element template name without prefix. Typically it equals to getType().

Return the title location based on question titleLocation property and QuestionTitleLocation of it's parents

Returns the type of the object as a string as it represents in the json.

Returns the type of the object as a string as it represents in the json. It should be in lowcase.

Set it to true, to add a comment for the question.

Returns true if there is a validation error(s) in the question.

Returns false if the question doesn't have an input element, for example: QuestionHtmlModel

Set this property to true, to show the "None" item on the bottom. If end-user checks this item, all other items would be unchecked.

Set this property to true, to show the "Select All" item on the top. If end-user checks this item, then all items are checked.

Returns false if the question doesn't have an input element or have multiple inputs: matrices or panel dynamic

Returns false if the question doesn't have a title property, for example: QuestionHtmlModel, or titleLocation property equals to "hidden"

Set this property to true to hide the question if there is no visible choices.

Set hideNumber to true to stop showing the number for this question. The question will not be counter

The unique identificator. It is generated automatically.

Set it different from 0 to increase the left padding.

Returns true if the question may have a title located on the left

Returns true if all items are selected

Returns true if the question in design mode right now.

Returns true if the question value is empty

Returns true if item is checked

Returns true if item is selected

Returns true if the object is loading from Json at the current moment.

Returns true if a user select the 'other' item.

Return false if it is not panel.

Returns true if readOnly property is true or survey is in display mode or parent panel/page is readOnly.

Set this property to true, to make the question a required. If a user doesn't answer the question then a validation error will be generated. Please note, this property is hidden for question without input, for example html question.

A static methods that returns true if a value underfined, null, empty string or empty array.

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

Use it to set the specific maxWidth constraint to the question like css style (%, px, em etc).

Use it to set the specific minWidth constraint to the question like css style (%, px, em etc).

Move question to a new container Page/Panel. Add as a last element if insertBefore parameter is not used or inserted into the given index, if insert parameter is number, or before the given element, if the insertBefore parameter is a question or panel

This is the identifier of a survey element - question or panel.

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'.

Returns the none item. By using this property, you may change programmatically it's value and text.

Use this property to set the different text for none item.

Event that raised on changing property of the ItemValue object. sender - the object that owns the property options.propertyName - the property name to which ItemValue array is belong. It can be "choices" for dropdown question options.obj - the instance of ItemValue object which property has been changed options.name - the property of ItemObject that has been changed options.oldValue - old value options.newValue - new value

Event that raise on property change of the sender object sender - the object that owns the property options.name - the property name that has been changed options.oldValue - old value. Please note, it equals to options.newValue if property is an array options.newValue - new value.

The event is fired when isReady property of question is changed.
options.question - the question
options.isReady - current value of isReady
options.oldIsReady - old value of isReady

The text that shows when the other item is choosed by the other input is empty.

Returns the other item. By using this property, you may change programmatically it's value and text.

Use this property to set the place holder text for other or comment field .

Use this property to set the different text for other item.

Get/set the page where the question is located.

A parent element. It can be panel or page.

Returns the rendred question title.

Returns questions count: 1 for the non-matrix questions and all inner visible questions that has input(s) widgets for question of matrix types.

Set it to true to make an element question/panel/page readonly. Please note, this property is hidden for question without input, for example html question.

Register a function that will be called on a property value changed from the names list.

Register a function that will be called on a property value changed.

Remove a particular error from the question error list.

The rendered width of the question.

The custom text that will be shown on required error. Use this property, if you do not want to show the default text. Please note, this property is hidden for question without input, for example html question.

An expression that returns true or false. If it returns true the Question becomes required and an end-user has to answer it. If it returns false the Question then an end-user may not answer it the Question maybe empty. The library runs the expression on survey start and on changing a question value. If the property is empty then isRequired property is used. Please note, this property is hidden for question without input, for example html question.

Returns the char/string for a required question.

Set it different from 0 to increase the right padding.

Run visibleIf and enableIf expressions. If visibleIf or/and enabledIf are not empty, then the results of performing the expression (true or false) set to the visible/readOnly properties.

Select all items, except other and none.

Returns the select all item. By using this property, you may change programmatically it's value and text.

Use this property to set the different text for Select All item.

set property value

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

Please use survey.storeOthersAsComment to change the behavior on the survey level. This property is depricated and invisible in Survey Creator. By default the entered text in the others input in the checkbox/radiogroup/dropdown are stored as "question name " + "-Comment". The value itself is "question name": "others". Set this property to false, to store the entered text directly in the "question name" key. Possible values are: "default", true, false

Returns the survey object.

Question title. Use survey questionTitleTemplate property to change the title question is rendered. If it is empty, then question name property is used.

Set this property different from "default" to set the specific question title location for this panel/page. Please note, this property is hidden for questions without input, for example html question.

It will select all items, except other and none. If all items have been already selected then it will clear the value

Deserialized the current object into JSON

Unregister notification on property value changed for all properties in the names list.

Unregister notification on property value changed

Use it to choose how other question values will be rendered in title if referenced in . Please note, this property is hidden for question without input, for example html question.

The list of question validators. Please note, this property is hidden for question without input, for example html question.

Get/Set the question value.

Use this property if you want to store the question result in the name different from the question name. Question name should be unique in the survey and valueName could be not unique. It allows to share data between several questions with the same valueName. The library set the value automatically if the question.name property is not valid. For example, if it contains the period '.' symbol. In this case if you set the question.name property to 'x.y' then the valueName becomes 'x y'. Please note, this property is hidden for questions without input, for example html question.

Use it to get/set the question visibility.

The list of items as they will be rendered. If needed items are sorted and the other item is added.

An expression that returns true or false. If it returns true the Question becomes visible and if it returns false the Question 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.

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

Use it to set the specific width to the question like css style (%, px, em etc).