Survey and Forms JavaScript Libraries: Documentation

The base class for SurveyJS objects.

Type to filter the list:

	clone method
	Make a clone of the existing object. Create a new object of the same type and load all properties into it. Type: () => Base Implemented in: Base
	fromJSON method
	Load object properties and elements. It doesn't reset properties that was changed before and they are not defined in the json parameter. Type: (json: any) => void Parameters: json, type: any , the object JSON definition Implemented in: Base See also: toJSON
	getPropertyByName method
	Returns the serializable property that belongs to this instance by property name. It returns null if the property is not exists. Type: (propName: string) => JsonObjectProperty Parameters: propName, type: string , property name Implemented in: Base
	getPropertyValue method
	Returns the property value by name Type: (name: string, defaultValue?: any) => any Parameters: name, type: string , property name defaultValue, type: any Implemented in: Base
	getTemplate method
	Returns the element template name without prefix. Typically it equals to getType(). Type: () => string Implemented in: Base See also: getType
	getType method
	Returns the question type. Possible values: "boolean" "checkbox" "comment" "dropdown" "expression" "file" "html" "image" "imagepicker" "matrix" "matrixdropdown" "matrixdynamic" "multipletext" "panel" "paneldynamic" "radiogroup" "rating" "ranking" "signaturepad" "text" Type: () => string Implemented in: Base
	inSurvey property
	Returns true if the object is inluded into survey, otherwise returns false. Type: boolean readonly Implemented in: Base
	isDesignMode property
	Returns true if the question in design mode right now. Type: boolean readonly Implemented in: Base
	isLoadingFromJson property
	Returns true if the object is loading from Json at the current moment. Type: boolean readonly Implemented in: Base
	isValueEmpty method
	Returns true if a value undefined, null, empty string or empty array. Type: (value: any, trimString?: boolean) => boolean Parameters: value, type: any trimString, type: boolean , a boolean parameter, default value true. If true then it trims the string and functions returns true for a string that contains white spaces only. Implemented in: Base
	onItemValuePropertyChanged event
	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 Type: Event<(sender: Base, options: any) => any, any> Implemented in: Base
	onPropertyChanged event
	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. Type: EventBase<Base> Implemented in: Base
	registerFunctionOnPropertiesValueChanged method
	Register a function that will be called on a property value changed from the names list. Type: (names: any, func: any, key?: string) => void Parameters: names, type: any , the list of properties names func, type: any , the function with no parameters that will be called on property changed. 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
	registerFunctionOnPropertyValueChanged method
	Register a function that will be called on a property value changed. Type: (name: string, func: any, key?: string) => void Parameters: name, type: string , the property name func, type: any , the function with no parameters that will be called on property changed. 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
	setPropertyValue method
	set property value Type: (name: string, val: any) => void Parameters: name, type: string , property name val, type: any , new property value Implemented in: Base
	toJSON method
	Deserialized the current object into JSON Type: () => any Implemented in: Base See also: fromJSON
	unRegisterFunctionOnPropertiesValueChanged method
	Unregister notification on property value changed for all properties in the names list. Type: (names: any, key?: string) => void Parameters: names, type: any , the list of properties names key, type: string , the key with which you have registered the notification for this property. It can be null. Implemented in: Base
	unRegisterFunctionOnPropertyValueChanged method
	Unregister notification on property value changed Type: (name: string, key?: string) => void Parameters: name, type: string , the property name key, type: string , the key with which you have registered the notification for this property. It can be null. Implemented in: Base

Base

Why We Use Cookies