Documentation Docs
Documentation Docs

AnswerCountValidator

A class that implements answer count validation in the question types that can have multiple values (for instance, Checkboxes).

View Demo

Inherited from the following class(es):

clone method

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

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

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

Type:
() => string
Implemented in:
Base
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

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

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

Type:
boolean readonly
Implemented in:
Base
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
maxCount property

A maximum number of selected answers.

View Demo

Type:
number writable

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

Implemented in:
AnswerCountValidator
minCount property

A minimum number of selected answers.

View Demo

Type:
number writable

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

Implemented in:
AnswerCountValidator

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

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

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
text property

An error message to display when a value fails validation.

Type:
string writable
Implemented in:
SurveyValidator
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

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

Copyright © 2024 Devsoft Baltic OÜ. All rights reserved.

Your cookie settings

We use cookies on our site to make your browsing experience more convenient and personal. In some cases, they are essential to making the site work properly. By clicking "Accept All", you consent to the use of all cookies in accordance with our Terms of Use & Privacy Statement. However, you may visit "Cookie settings" to provide a controlled consent.

Your renewal subscription expires soon.

Since the license is perpetual, you will still have permanent access to the product versions released within the first 12 month of the original purchase date.

If you wish to continue receiving technical support from our Help Desk specialists and maintain access to the latest product updates, make sure to renew your subscription by clicking the "Renew" button below.

Your renewal subscription has expired.

Since the license is perpetual, you will still have permanent access to the product versions released within the first 12 month of the original purchase date.

If you wish to continue receiving technical support from our Help Desk specialists and maintain access to the latest product updates, make sure to renew your subscription by clicking the "Renew" button below.