CKEditor Ecosystem Documentation
Search
Report an issue
Home/CKEditor 4/API
Class

CKEDITOR.event

class
See source

Creates an event class instance. This constructor is rarely used, being the implementOn function used in class prototypes directly instead.

This is a base class for classes and objects that require event handling features.

Do not confuse this class with CKEDITOR.dom.event which is instead used for DOM events. The CKEDITOR.event class implements the internal event system used by the CKEditor to fire API related events.

Filtering

Properties

Static properties

Methods

  • constructor() → event

    See source

    Creates an event class instance.

    Returns

    event

  • capture()

    See source

    Register event handler under the capturing stage on supported target.

  • define( name, meta )

    See source

    Predefine some intrinsic properties on a specific event name.

    Parameters

    name : String

    The event name

    meta : Object

  • fire( eventName, [ data ], [ editor ] ) → Boolean | Object

    See source

    Fires an specific event in the object. All registered listeners are called at this point.

    someObject.on( 'someEvent', function() { ... } );
someObject.on( 'someEvent', function() { ... } );
someObject.fire( 'someEvent' );             // Both listeners are called.

someObject.on( 'someEvent', function( event ) {
    alert( event.data );                    // 'Example'
} );
someObject.fire( 'someEvent', 'Example' );

    Parameters

    eventName : String

    The event name to fire.

    [ data ] : Object

    Data to be sent as the CKEDITOR.eventInfo.data when calling the listeners.

    [ editor ] : editor

    The editor instance to send as the CKEDITOR.eventInfo.editor when calling the listener.

    Returns

    Boolean | Object

    A boolean indicating that the event is to be canceled, or data returned by one of the listeners.

  • fireOnce( eventName, [ data ], [ editor ] ) → Boolean | Object

    See source

    Fires an specific event in the object, releasing all listeners registered to that event. The same listeners are not called again on successive calls of it or of fire.

    someObject.on( 'someEvent', function() { ... } );
someObject.fire( 'someEvent' );         // Above listener called.
someObject.fireOnce( 'someEvent' );     // Above listener called.
someObject.fire( 'someEvent' );         // No listeners called.

    Parameters

    eventName : String

    The event name to fire.

    [ data ] : Object

    Data to be sent as the CKEDITOR.eventInfo.data when calling the listeners.

    [ editor ] : editor

    The editor instance to send as the CKEDITOR.eventInfo.editor when calling the listener.

    Returns

    Boolean | Object

    A booloan indicating that the event is to be canceled, or data returned by one of the listeners.

  • hasListeners( eventName ) → Boolean

    See source

    Checks if there is any listener registered to a given event.

    var myListener = function() { ... };
someObject.on( 'someEvent', myListener );
alert( someObject.hasListeners( 'someEvent' ) );    // true
alert( someObject.hasListeners( 'noEvent' ) );      // false

    Parameters

    eventName : String

    The event name.

    Returns

    Boolean

  • on( eventName, listenerFunction, [ scopeObj ], [ listenerData ], [ priority ] ) → Object

    See source

    Registers a listener to a specific event in the current object.

    someObject.on( 'someEvent', function() {
    alert( this == someObject );        // true
} );

someObject.on( 'someEvent', function() {
    alert( this == anotherObject );     // true
}, anotherObject );

someObject.on( 'someEvent', function( event ) {
    alert( event.listenerData );        // 'Example'
}, null, 'Example' );

someObject.on( 'someEvent', function() { ... } );                       // 2nd called
someObject.on( 'someEvent', function() { ... }, null, null, 100 );      // 3rd called
someObject.on( 'someEvent', function() { ... }, null, null, 1 );        // 1st called

    Note: CKEditor's event system has a limitation that one function cannot be used as a listener for the same event more than once. Hence, to reuse it with multiple listeners, it should be wrapped into additional wrapper function:

    function listener( evt ) { ... };

someObject.on( 'someEvent', function() {
    listener();
} );

someObject.on( 'someEvent', function( evt ) {
    listener( evt );
} );

    Parameters

    eventName : String

    The event name to which listen.

    listenerFunction : Function

    The function listening to the event. A single CKEDITOR.eventInfo object instanced is passed to this function containing all the event data.

    [ scopeObj ] : Object

    The object used to scope the listener call (the this object). If omitted, the current object is used.

    [ listenerData ] : Object

    Data to be sent as the CKEDITOR.eventInfo.listenerData when calling the listener.

    [ priority ] : Number

    The listener priority. Lower priority listeners are called first. Listeners with the same priority value are called in registration order.

    Defaults to 10

    Returns

    Object

    An object containing the removeListener function, which can be used to remove the listener at any time.

  • once()

    See source

    Similiar with on but the listener will be called only once upon the next event firing.

    CKEDITOR.event.on

  • removeAllListeners()

    See source

    Remove all existing listeners on this object, for cleanup purpose.

  • removeListener( eventName, listenerFunction )

    See source

    Unregisters a listener function from being called at the specified event. No errors are thrown if the listener has not been registered previously.

    var myListener = function() { ... };
someObject.on( 'someEvent', myListener );
someObject.fire( 'someEvent' );                 // myListener called.
someObject.removeListener( 'someEvent', myListener );
someObject.fire( 'someEvent' );                 // myListener not called.

    Parameters

    eventName : String

    The event name.

    listenerFunction : Function

    The listener function to unregister.

Static methods

  • static

    implementOn( targetObject )

    See source

    Implements the CKEDITOR.event features in an object.

    var myObject = { message: 'Example' };
CKEDITOR.event.implementOn( myObject );

myObject.on( 'testEvent', function() {
    alert( this.message );
} );
myObject.fire( 'testEvent' ); // 'Example'

    Parameters

    targetObject : Object

    The object into which implement the features.