Base: SurveyJS Library

The base class for SurveyJS objects.

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	checkAndSetPropertyValue method
	set property value and before check if new property value is correct by calling JsonProperty onSettingValue function If onSettingValue is not set in declaration, then this function works as `setPropertyValue`. Type: (name: string, val: any) => void Parameters: name, type: string , property name val, type: any , new property value Implemented in: Base See also: setPropertyValue
	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
	isDescendantOf method
	Use this method to find out if the current instance is of the given `typeName` or inherited from it. Type: (typeName: string) => boolean Parameters: typeName, type: string , One of the values listed in the [getType()](https://surveyjs.io/Documentation/Library?id=surveymodel#getType) description. Implemented in: Base See also: getType
	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 See also: checkAndSetPropertyValue
	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

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