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DropdownView

Api-class iconclass

The dropdown view class. It manages the dropdown button and dropdown panel.

In most cases, the easiest way to create a dropdown is by using the createDropdown util:

const dropdown = createDropdown( locale );

// Configure dropdown's button properties:
dropdown.buttonView.set( {
	label: 'A dropdown',
	withText: true
} );

dropdown.render();

dropdown.panelView.element.textContent = 'Content of the panel';

// Will render a dropdown with a panel containing a "Content of the panel" text.
document.body.appendChild( dropdown.element );
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If you want to add a richer content to the dropdown panel, you can use the addListToDropdown and addToolbarToDropdown helpers. See more examples in createDropdown documentation.

If you want to create a completely custom dropdown, then you can compose it manually:

const button = new DropdownButtonView( locale );
const panel = new DropdownPanelView( locale );
const dropdown = new DropdownView( locale, button, panel );

button.set( {
	label: 'A dropdown',
	withText: true
} );

dropdown.render();

panel.element.textContent = 'Content of the panel';

// Will render a dropdown with a panel containing a "Content of the panel" text.
document.body.appendChild( dropdown.element );
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However, dropdown created this way will contain little behavior. You will need to implement handlers for actions such as clicking outside an open dropdown (which should close it) and support for arrow keys inside the panel. Therefore, unless you really know what you do and you really need to do it, it is recommended to use the createDropdown helper.

See source (with github icon)

Properties

Static properties

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    defaultPanelPositions : Record<string, PositioningFunction>
    static

    A set of positioning functions used by the dropdown view to determine the optimal position (i.e. fitting into the browser viewport) of its panel when panelPosition is set to 'auto'`.

    The available positioning functions are as follow:

    South

    • south
    			[ Button ]
		+-----------------+
		|      Panel      |
		+-----------------+
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    • southEast
    		[ Button ]
		+-----------------+
		|      Panel      |
		+-----------------+
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    • southWest
    		         [ Button ]
		+-----------------+
		|      Panel      |
		+-----------------+
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    • southMiddleEast
    		  [ Button ]
		+-----------------+
		|      Panel      |
		+-----------------+
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    • southMiddleWest
    		       [ Button ]
		+-----------------+
		|      Panel      |
		+-----------------+
    Copy code

    North

    • north
    		+-----------------+
		|      Panel      |
		+-----------------+
		    [ Button ]
    Copy code
    • northEast
    		+-----------------+
		|      Panel      |
		+-----------------+
		[ Button ]
    Copy code
    • northWest
    		+-----------------+
		|      Panel      |
		+-----------------+
		         [ Button ]
    Copy code
    • northMiddleEast
    		+-----------------+
		|      Panel      |
		+-----------------+
		  [ Button ]
    Copy code
    • northMiddleWest
    		+-----------------+
		|      Panel      |
		+-----------------+
		       [ Button ]
    Copy code

    Positioning functions are compatible with DomPoint.

    The name that position function returns will be reflected in dropdown panel's class that controls its placement. See panelPosition to learn more.

    See source (with github icon)
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    _getOptimalPosition : ( options: DomOptimalPositionOptions ) => ( null | DomPoint )
    Lock iconprivatestatic

    A function used to calculate the optimal position for the dropdown panel.

    See source (with github icon)

Methods

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    constructor( locale, buttonView, panelView )

    Creates an instance of the dropdown.

    Also see render.

    See source (with github icon)

    Parameters

    locale : undefined | Locale

    The localization services instance.

    buttonView : object
    panelView : DropdownPanelView
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    bind( bindProperties ) → ObservableMultiBindChain
    inherited

    Binds observable properties to other objects implementing the Observable interface.

    Read more in the dedicated guide covering the topic of property bindings with some additional examples.

    Consider two objects: a button and an associated command (both Observable).

    A simple property binding could be as follows:

    button.bind( 'isEnabled' ).to( command, 'isEnabled' );
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    or even shorter:

    button.bind( 'isEnabled' ).to( command );
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    which works in the following way:

    • button.isEnabled instantly equals command.isEnabled,
    • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

    Note: To release the binding, use unbind.

    You can also "rename" the property in the binding by specifying the new name in the to() chain:

    button.bind( 'isEnabled' ).to( command, 'isWorking' );
    Copy code

    It is possible to bind more than one property at a time to shorten the code:

    button.bind( 'isEnabled', 'value' ).to( command );
    Copy code

    which corresponds to:

    button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
    Copy code

    The binding can include more than one observable, combining multiple data sources in a custom callback:

    button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
    Copy code

    Using a custom callback allows processing the value before passing it to the target property:

    button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
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    It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

    button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
    Copy code
    See source (with github icon)

    Parameters

    bindProperties : Array<'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'element' | 'template' | 'focus' | 'id' | 'isRendered' | 'locale' | 't' | 'viewUid' | 'bindTemplate' | 'createCollection' | 'registerChild' | 'deregisterChild' | 'setTemplate' | 'extendTemplate' | 'render' | 'destroy' | 'class' | 'focusTracker' | 'isEnabled' | 'isOpen' | 'buttonView' | 'panelView' | 'keystrokes' | 'panelPosition' | 'listView' | 'toolbarView' | 'menuView' | 'ariaDescribedById'>

    Observable properties that will be bound to other observable(s).

    Returns

    ObservableMultiBindChain

    The bind chain with the to() and toMany() methods.

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    bind( bindProperty1, bindProperty2 ) → ObservableDualBindChain<K1, DropdownView[ K1 ], K2, DropdownView[ K2 ]>
    inherited

    Binds observable properties to other objects implementing the Observable interface.

    Read more in the dedicated guide covering the topic of property bindings with some additional examples.

    Consider two objects: a button and an associated command (both Observable).

    A simple property binding could be as follows:

    button.bind( 'isEnabled' ).to( command, 'isEnabled' );
    Copy code

    or even shorter:

    button.bind( 'isEnabled' ).to( command );
    Copy code

    which works in the following way:

    • button.isEnabled instantly equals command.isEnabled,
    • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

    Note: To release the binding, use unbind.

    You can also "rename" the property in the binding by specifying the new name in the to() chain:

    button.bind( 'isEnabled' ).to( command, 'isWorking' );
    Copy code

    It is possible to bind more than one property at a time to shorten the code:

    button.bind( 'isEnabled', 'value' ).to( command );
    Copy code

    which corresponds to:

    button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
    Copy code

    The binding can include more than one observable, combining multiple data sources in a custom callback:

    button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
    Copy code

    Using a custom callback allows processing the value before passing it to the target property:

    button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
    Copy code

    It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

    button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
    Copy code
    See source (with github icon)

    Type parameters

    K1
    K2

    Parameters

    bindProperty1 : K1

    Observable property that will be bound to other observable(s).

    bindProperty2 : K2

    Observable property that will be bound to other observable(s).

    Returns

    ObservableDualBindChain<K1, DropdownView[ K1 ], K2, DropdownView[ K2 ]>

    The bind chain with the to() and toMany() methods.

  • Chevron-right icon

    bind( bindProperty ) → ObservableSingleBindChain<K, DropdownView[ K ]>
    inherited

    Binds observable properties to other objects implementing the Observable interface.

    Read more in the dedicated guide covering the topic of property bindings with some additional examples.

    Consider two objects: a button and an associated command (both Observable).

    A simple property binding could be as follows:

    button.bind( 'isEnabled' ).to( command, 'isEnabled' );
    Copy code

    or even shorter:

    button.bind( 'isEnabled' ).to( command );
    Copy code

    which works in the following way:

    • button.isEnabled instantly equals command.isEnabled,
    • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

    Note: To release the binding, use unbind.

    You can also "rename" the property in the binding by specifying the new name in the to() chain:

    button.bind( 'isEnabled' ).to( command, 'isWorking' );
    Copy code

    It is possible to bind more than one property at a time to shorten the code:

    button.bind( 'isEnabled', 'value' ).to( command );
    Copy code

    which corresponds to:

    button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
    Copy code

    The binding can include more than one observable, combining multiple data sources in a custom callback:

    button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
    Copy code

    Using a custom callback allows processing the value before passing it to the target property:

    button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
    Copy code

    It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

    button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
    Copy code
    See source (with github icon)

    Type parameters

    K

    Parameters

    bindProperty : K

    Observable property that will be bound to other observable(s).

    Returns

    ObservableSingleBindChain<K, DropdownView[ K ]>

    The bind chain with the to() and toMany() methods.

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    createCollection( [ views ] ) → ViewCollection<T>
    inherited

    Creates a new collection of views, which can be used as children of this view.

    class SampleView extends View {
	constructor( locale ) {
		super( locale );

		const child = new ChildView( locale );
		this.items = this.createCollection( [ child ] );
 *
		this.setTemplate( {
			tag: 'p',

			// `items` collection will render here.
			children: this.items
		} );
	}
}

const view = new SampleView( locale );
view.render();

// It will append <p><child#element></p> to the <body>.
document.body.appendChild( view.element );
    Copy code
    See source (with github icon)

    Type parameters

    T : extends [object Object] = View

    Parameters

    [ views ] : Iterable<T>

    Initial views of the collection.

    Returns

    ViewCollection<T>

    A new collection of view instances.

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    decorate( methodName ) → void
    inherited

    Turns the given methods of this object into event-based ones. This means that the new method will fire an event (named after the method) and the original action will be plugged as a listener to that event.

    Read more in the dedicated guide covering the topic of decorating methods with some additional examples.

    Decorating the method does not change its behavior (it only adds an event), but it allows to modify it later on by listening to the method's event.

    For example, to cancel the method execution the event can be stopped:

    class Foo extends ObservableMixin() {
	constructor() {
		super();
		this.decorate( 'method' );
	}

	method() {
		console.log( 'called!' );
	}
}

const foo = new Foo();
foo.on( 'method', ( evt ) => {
	evt.stop();
}, { priority: 'high' } );

foo.method(); // Nothing is logged.
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    Note: The high priority listener has been used to execute this particular callback before the one which calls the original method (which uses the "normal" priority).

    It is also possible to change the returned value:

    foo.on( 'method', ( evt ) => {
	evt.return = 'Foo!';
} );

foo.method(); // -> 'Foo'
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    Finally, it is possible to access and modify the arguments the method is called with:

    method( a, b ) {
	console.log( `${ a }, ${ b }`  );
}

// ...

foo.on( 'method', ( evt, args ) => {
	args[ 0 ] = 3;

	console.log( args[ 1 ] ); // -> 2
}, { priority: 'high' } );

foo.method( 1, 2 ); // -> '3, 2'
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    See source (with github icon)

    Parameters

    methodName : 'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'element' | 'template' | 'focus' | 'id' | 'isRendered' | 'locale' | 't' | 'viewUid' | 'bindTemplate' | 'createCollection' | 'registerChild' | 'deregisterChild' | 'setTemplate' | 'extendTemplate' | 'render' | 'destroy' | 'class' | 'focusTracker' | 'isEnabled' | 'isOpen' | 'buttonView' | 'panelView' | 'keystrokes' | 'panelPosition' | 'listView' | 'toolbarView' | 'menuView' | 'ariaDescribedById'

    Name of the method to decorate.

    Returns

    void
  • Chevron-right icon

    delegate( events ) → EmitterMixinDelegateChain
    inherited

    Delegates selected events to another Emitter. For instance:

    emitterA.delegate( 'eventX' ).to( emitterB );
emitterA.delegate( 'eventX', 'eventY' ).to( emitterC );
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    then eventX is delegated (fired by) emitterB and emitterC along with data:

    emitterA.fire( 'eventX', data );
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    and eventY is delegated (fired by) emitterC along with data:

    emitterA.fire( 'eventY', data );
    Copy code
    See source (with github icon)

    Parameters

    events : Array<string>

    Event names that will be delegated to another emitter.

    Returns

    EmitterMixinDelegateChain
  • Chevron-right icon

    deregisterChild( children ) → void
    inherited

    The opposite of registerChild. Removes a child view from this view instance. Once removed, the child is no longer managed by its parent, e.g. it can safely become a child of another parent view.

    See source (with github icon)

    Parameters

    children : View<HTMLElement> | Iterable<View<HTMLElement>>

    Child views to be removed.

    Returns

    void

    Related:

  • Chevron-right icon

    destroy() → void
    inherited

    Recursively destroys the view instance and child views added by registerChild and residing in collections created by the createCollection.

    Destruction disables all event listeners:

    • created on the view, e.g. view.on( 'event', () => {} ),
    • defined in the template for DOM events.
    See source (with github icon)

    Returns

    void
  • Chevron-right icon

    extendTemplate( definition ) → void
    inherited

    Extends the template of the view with with given definition.

    A shorthand for:

    Template.extend( view.template, definition );
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    Note: Is requires the template to be already set. See setTemplate.

    See source (with github icon)

    Parameters

    definition : Partial<TemplateDefinition>

    Definition which extends the template.

    Returns

    void
  • Chevron-right icon

    fire( eventOrInfo, args ) → GetEventInfo<TEvent>[ 'return' ]
    inherited

    Fires an event, executing all callbacks registered for it.

    The first parameter passed to callbacks is an EventInfo object, followed by the optional args provided in the fire() method call.

    See source (with github icon)

    Type parameters

    TEvent : extends BaseEvent

    The type describing the event. See BaseEvent.

    Parameters

    eventOrInfo : GetNameOrEventInfo<TEvent>

    The name of the event or EventInfo object if event is delegated.

    args : TEvent[ 'args' ]

    Additional arguments to be passed to the callbacks.

    Returns

    GetEventInfo<TEvent>[ 'return' ]

    By default the method returns undefined. However, the return value can be changed by listeners through modification of the evt.return's property (the event info is the first param of every callback).

  • Chevron-right icon

    focus() → void

    Focuses the buttonView.

    See source (with github icon)

    Returns

    void
  • Chevron-right icon

    listenTo( emitter, event, callback, [ options ] ) → void
    inherited

    Registers a callback function to be executed when an event is fired in a specific (emitter) object.

    Events can be grouped in namespaces using :. When namespaced event is fired, it additionally fires all callbacks for that namespace.

    // myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).
myEmitter.on( 'myGroup', genericCallback );
myEmitter.on( 'myGroup:myEvent', specificCallback );

// genericCallback is fired.
myEmitter.fire( 'myGroup' );
// both genericCallback and specificCallback are fired.
myEmitter.fire( 'myGroup:myEvent' );
// genericCallback is fired even though there are no callbacks for "foo".
myEmitter.fire( 'myGroup:foo' );
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    An event callback can stop the event and set the return value of the fire method.

    See source (with github icon)

    Type parameters

    TEvent : extends BaseEvent

    The type describing the event. See BaseEvent.

    Parameters

    emitter : Emitter

    The object that fires the event.

    event : TEvent[ 'name' ]

    The name of the event.

    callback : GetCallback<TEvent>

    The function to be called on event.

    [ options ] : CallbackOptions

    Additional options.

    Returns

    void
  • Chevron-right icon

    listenTo( emitter, event, callback, [ options ] ) → void
    inherited

    Registers a callback function to be executed when an event is fired in a specific (emitter) object.

    Events can be grouped in namespaces using :. When namespaced event is fired, it additionally fires all callbacks for that namespace.

    // myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).
myEmitter.on( 'myGroup', genericCallback );
myEmitter.on( 'myGroup:myEvent', specificCallback );

// genericCallback is fired.
myEmitter.fire( 'myGroup' );
// both genericCallback and specificCallback are fired.
myEmitter.fire( 'myGroup:myEvent' );
// genericCallback is fired even though there are no callbacks for "foo".
myEmitter.fire( 'myGroup:foo' );
    Copy code

    An event callback can stop the event and set the return value of the fire method.

    See source (with github icon)

    Type parameters

    TEvent : extends BaseEvent

    The type describing the event. See BaseEvent.

    Parameters

    emitter : Emitter

    The object that fires the event.

    event : TEvent[ 'name' ]

    The name of the event.

    callback : GetCallback<TEvent>

    The function to be called on event.

    [ options ] : GetCallbackOptions<TEvent>

    Additional options.

    Returns

    void
  • Chevron-right icon

    listenTo( emitter, event, callback, [ options ] ) → void
    inherited

    Registers a callback function to be executed when an event is fired in a specific Emitter or DOM Node. It is backwards compatible with listenTo.

    See source (with github icon)

    Type parameters

    K : extends keyof DomEventMap

    Parameters

    emitter : Window | EventTarget | Node

    The object that fires the event.

    event : K

    The name of the event.

    callback : ( this: this, ev: EventInfo, event: DomEventMap[ K ] ) => void

    The function to be called on event.

    [ options ] : object

    Additional options.

    Returns

    void
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    off( event, callback ) → void
    inherited

    Stops executing the callback on the given event. Shorthand for this.stopListening( this, event, callback ).

    See source (with github icon)

    Parameters

    event : string

    The name of the event.

    callback : Function

    The function to stop being called.

    Returns

    void
  • Chevron-right icon

    on( event, callback, [ options ] ) → void
    inherited

    Registers a callback function to be executed when an event is fired.

    Shorthand for this.listenTo( this, event, callback, options ) (it makes the emitter listen on itself).

    See source (with github icon)

    Type parameters

    TEvent : extends BaseEvent

    The type descibing the event. See BaseEvent.

    Parameters

    event : TEvent[ 'name' ]

    The name of the event.

    callback : GetCallback<TEvent>

    The function to be called on event.

    [ options ] : GetCallbackOptions<TEvent>

    Additional options.

    Returns

    void
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    once( event, callback, [ options ] ) → void
    inherited

    Registers a callback function to be executed on the next time the event is fired only. This is similar to calling on followed by off in the callback.

    See source (with github icon)

    Type parameters

    TEvent : extends BaseEvent

    The type descibing the event. See BaseEvent.

    Parameters

    event : TEvent[ 'name' ]

    The name of the event.

    callback : GetCallback<TEvent>

    The function to be called on event.

    [ options ] : GetCallbackOptions<TEvent>

    Additional options.

    Returns

    void
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    registerChild( children ) → void
    inherited

    Registers a new child view under the view instance. Once registered, a child view is managed by its parent, including rendering and destruction.

    To revert this, use deregisterChild.

    class SampleView extends View {
	constructor( locale ) {
		super( locale );

		this.childA = new SomeChildView( locale );
		this.childB = new SomeChildView( locale );

		this.setTemplate( { tag: 'p' } );

		// Register the children.
		this.registerChild( [ this.childA, this.childB ] );
	}

	render() {
		super.render();

		this.element.appendChild( this.childA.element );
		this.element.appendChild( this.childB.element );
	}
}

const view = new SampleView( locale );

view.render();

// Will append <p><childA#element><b></b><childB#element></p>.
document.body.appendChild( view.element );
    Copy code

    Note: There's no need to add child views if they're already referenced in the template:

    class SampleView extends View {
	constructor( locale ) {
		super( locale );

		this.childA = new SomeChildView( locale );
		this.childB = new SomeChildView( locale );

		this.setTemplate( {
			tag: 'p',

 * 			// These children will be added automatically. There's no
 * 			// need to call registerChild for any of them.
			children: [ this.childA, this.childB ]
		} );
	}

	// ...
}
    Copy code
    See source (with github icon)

    Parameters

    children : View<HTMLElement> | Iterable<View<HTMLElement>>

    Children views to be registered.

    Returns

    void
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    render() → void

    Recursively renders the view.

    Once the view is rendered:

    Note: The children of the view:

    In general, render() method is the right place to keep the code which refers to the element and should be executed at the very beginning of the view's life cycle.

    It is possible to extend the template before the view is rendered. To allow an early customization of the view (e.g. by its parent), such references should be done in render().

    class SampleView extends View {
	constructor() {
		this.setTemplate( {
			// ...
		} );
	},

	render() {
		// View#element becomes available.
		super.render();

		// The "scroll" listener depends on #element.
		this.listenTo( window, 'scroll', () => {
			// A reference to #element would render the #template and make it non-extendable.
			if ( window.scrollY > 0 ) {
				this.element.scrollLeft = 100;
			} else {
				this.element.scrollLeft = 0;
			}
		} );
	}
}

const view = new SampleView();

// Let's customize the view before it gets rendered.
view.extendTemplate( {
	attributes: {
		class: [
			'additional-class'
		]
	}
} );

// Late rendering allows customization of the view.
view.render();
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    See source (with github icon)

    Returns

    void
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    set( values ) → void
    inherited

    Creates and sets the value of an observable properties of this object. Such a property becomes a part of the state and is observable.

    It accepts a single object literal containing key/value pairs with properties to be set.

    This method throws the observable-set-cannot-override error if the observable instance already has a property with the given property name. This prevents from mistakenly overriding existing properties and methods, but means that foo.set( 'bar', 1 ) may be slightly slower than foo.bar = 1.

    In TypeScript, those properties should be declared in class using declare keyword. In example:

    public declare myProp1: number;
public declare myProp2: string;

constructor() {
	this.set( {
		'myProp1: 2,
		'myProp2: 'foo'
	} );
}
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    See source (with github icon)

    Parameters

    values : object

    An object with name=>value pairs.

    Returns

    void
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    set( name, value ) → void
    inherited

    Creates and sets the value of an observable property of this object. Such a property becomes a part of the state and is observable.

    This method throws the observable-set-cannot-override error if the observable instance already has a property with the given property name. This prevents from mistakenly overriding existing properties and methods, but means that foo.set( 'bar', 1 ) may be slightly slower than foo.bar = 1.

    In TypeScript, those properties should be declared in class using declare keyword. In example:

    public declare myProp: number;

constructor() {
	this.set( 'myProp', 2 );
}
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    See source (with github icon)

    Type parameters

    K

    Parameters

    name : K

    The property's name.

    value : DropdownView[ K ]

    The property's value.

    Returns

    void
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    setTemplate( definition ) → void
    inherited

    Sets the template of the view with with given definition.

    A shorthand for:

    view.setTemplate( definition );
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    See source (with github icon)

    Parameters

    definition : TemplateDefinition

    Definition of view's template.

    Returns

    void
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    stopDelegating( [ event ], [ emitter ] ) → void
    inherited

    Stops delegating events. It can be used at different levels:

    • To stop delegating all events.
    • To stop delegating a specific event to all emitters.
    • To stop delegating a specific event to a specific emitter.
    See source (with github icon)

    Parameters

    [ event ] : string

    The name of the event to stop delegating. If omitted, stops it all delegations.

    [ emitter ] : Emitter

    (requires event) The object to stop delegating a particular event to. If omitted, stops delegation of event to all emitters.

    Returns

    void
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    stopListening( [ emitter ], [ event ], [ callback ] ) → void
    inherited

    Stops listening for events. It can be used at different levels:

    • To stop listening to a specific callback.
    • To stop listening to a specific event.
    • To stop listening to all events fired by a specific object.
    • To stop listening to all events fired by all objects.
    See source (with github icon)

    Parameters

    [ emitter ] : Emitter

    The object to stop listening to. If omitted, stops it for all objects.

    [ event ] : string

    (Requires the emitter) The name of the event to stop listening to. If omitted, stops it for all events from emitter.

    [ callback ] : Function

    (Requires the event) The function to be removed from the call list for the given event.

    Returns

    void
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    stopListening( [ emitter ], [ event ], [ callback ] ) → void
    inherited

    Stops listening for events. It can be used at different levels: It is backwards compatible with listenTo.

    • To stop listening to a specific callback.
    • To stop listening to a specific event.
    • To stop listening to all events fired by a specific object.
    • To stop listening to all events fired by all objects.
    See source (with github icon)

    Parameters

    [ emitter ] : Window | EventTarget | Node | Emitter

    The object to stop listening to. If omitted, stops it for all objects.

    [ event ] : string

    (Requires the emitter) The name of the event to stop listening to. If omitted, stops it for all events from emitter.

    [ callback ] : Function

    (Requires the event) The function to be removed from the call list for the given event.

    Returns

    void
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    unbind( unbindProperties ) → void
    inherited

    Removes the binding created with bind.

    // Removes the binding for the 'a' property.
A.unbind( 'a' );

// Removes bindings for all properties.
A.unbind();
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    See source (with github icon)

    Parameters

    unbindProperties : Array<'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'element' | 'template' | 'focus' | 'id' | 'isRendered' | 'locale' | 't' | 'viewUid' | 'bindTemplate' | 'createCollection' | 'registerChild' | 'deregisterChild' | 'setTemplate' | 'extendTemplate' | 'render' | 'destroy' | 'class' | 'focusTracker' | 'isEnabled' | 'isOpen' | 'buttonView' | 'panelView' | 'keystrokes' | 'panelPosition' | 'listView' | 'toolbarView' | 'menuView' | 'ariaDescribedById'>

    Observable properties to be unbound. All the bindings will be released if no properties are provided.

    Returns

    void

Events

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    change:ariaDescribedById( eventInfo, name, value, oldValue )

    Fired when the ariaDescribedById property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (ariaDescribedById).

    value : undefined | string

    New value of the ariaDescribedById property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the ariaDescribedById property with given key or null, if property was not set before.

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    change:class( eventInfo, name, value, oldValue )

    Fired when the class property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (class).

    value : undefined | string

    New value of the class property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the class property with given key or null, if property was not set before.

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    change:id( eventInfo, name, value, oldValue )

    Fired when the id property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (id).

    value : undefined | string

    New value of the id property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the id property with given key or null, if property was not set before.

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    change:isEnabled( eventInfo, name, value, oldValue )

    Fired when the isEnabled property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (isEnabled).

    value : boolean

    New value of the isEnabled property with given key or null, if operation should remove property.

    oldValue : boolean

    Old value of the isEnabled property with given key or null, if property was not set before.

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    change:isOpen( eventInfo, name, value, oldValue )

    Fired when the isOpen property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (isOpen).

    value : boolean

    New value of the isOpen property with given key or null, if operation should remove property.

    oldValue : boolean

    Old value of the isOpen property with given key or null, if property was not set before.

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    change:panelPosition( eventInfo, name, value, oldValue )

    Fired when the panelPosition property changed value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (panelPosition).

    value : 'auto' | PanelPosition

    New value of the panelPosition property with given key or null, if operation should remove property.

    oldValue : 'auto' | PanelPosition

    Old value of the panelPosition property with given key or null, if property was not set before.

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    change:{property}( eventInfo, name, value, oldValue )
    inherited

    Fired when a property changed value.

    observable.set( 'prop', 1 );

observable.on<ObservableChangeEvent<number>>( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
	console.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );
} );

observable.prop = 2; // -> 'prop has changed from 1 to 2'
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    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    The property name.

    value : TValue

    The new property value.

    oldValue : TValue

    The previous property value.

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    execute( eventInfo )

    Fired when an item inside the dropdown is executed.

    Note: Only supported when dropdown was integrated with its child view using one of the helper functions: addListToDropdown, addToolbarToDropdown, or addMenuToDropdown.

    When integrated with a list, it fires when a child of one of ListItemViews fired execute event.

    When integrated with a toolbar, it fires when one of the buttons has been executed.

    When integrated with a nested menu, it fires when one of the menu buttons has been executed.

    In each case, the event is delegated from the component which fired it. It does not have additional parameters and event.source is the original component.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

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    render( eventInfo, <anonymous> )
    inherited

    Event fired by the render method. Actual rendering is executed as a listener to this event with the default priority.

    See decorate for more information and samples.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    <anonymous> : Parameters<TObservable[ TName ]>
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    set:ariaDescribedById( eventInfo, name, value, oldValue )

    Fired when the ariaDescribedById property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (ariaDescribedById).

    value : undefined | string

    New value of the ariaDescribedById property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the ariaDescribedById property with given key or null, if property was not set before.

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    set:class( eventInfo, name, value, oldValue )

    Fired when the class property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (class).

    value : undefined | string

    New value of the class property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the class property with given key or null, if property was not set before.

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    set:id( eventInfo, name, value, oldValue )

    Fired when the id property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (id).

    value : undefined | string

    New value of the id property with given key or null, if operation should remove property.

    oldValue : undefined | string

    Old value of the id property with given key or null, if property was not set before.

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    set:isEnabled( eventInfo, name, value, oldValue )

    Fired when the isEnabled property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (isEnabled).

    value : boolean

    New value of the isEnabled property with given key or null, if operation should remove property.

    oldValue : boolean

    Old value of the isEnabled property with given key or null, if property was not set before.

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    set:isOpen( eventInfo, name, value, oldValue )

    Fired when the isOpen property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (isOpen).

    value : boolean

    New value of the isOpen property with given key or null, if operation should remove property.

    oldValue : boolean

    Old value of the isOpen property with given key or null, if property was not set before.

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    set:panelPosition( eventInfo, name, value, oldValue )

    Fired when the panelPosition property is going to be set but is not set yet (before the change event is fired).

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    Name of the changed property (panelPosition).

    value : 'auto' | PanelPosition

    New value of the panelPosition property with given key or null, if operation should remove property.

    oldValue : 'auto' | PanelPosition

    Old value of the panelPosition property with given key or null, if property was not set before.

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    set:{property}( eventInfo, name, value, oldValue )
    inherited

    Fired when a property value is going to be set but is not set yet (before the change event is fired).

    You can control the final value of the property by using the event's return property.

    observable.set( 'prop', 1 );

observable.on<ObservableSetEvent<number>>( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {
	console.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );
	console.log( `Current property value is ${ observable[ propertyName ] }` );

	// Let's override the value.
	evt.return = 3;
} );

observable.on<ObservableChangeEvent<number>>( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
	console.log( `Value has changed from ${ oldValue } to ${ newValue }` );
} );

observable.prop = 2; // -> 'Value is going to be changed from 1 to 2'
                     // -> 'Current property value is 1'
                     // -> 'Value has changed from 1 to 3'
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    Note: The event is fired even when the new value is the same as the old value.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : string

    The property name.

    value : TValue

    The new property value.

    oldValue : TValue

    The previous property value.

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    submit( eventInfo )
    inherited

    Fired by submitHandler helper.

    See source (with github icon)

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

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