Class: Observable

Subclasses

• ol.Object

Extends

• goog.events.EventTarget

Methods

ol.Observable.unByKey(key)

src/ol/observable.js, line 42

Removes an event listener using the key returned by on() or once().

Name	Type	Description
key	goog.events.Key	The key returned by on() or once().

changed() experimental

src/ol/observable.js, line 51

Increases the revision counter and dispatches a 'change' event.

getRevision(){number} experimental

src/ol/observable.js, line 70

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:

Revision.

on(type, listener, opt_this){goog.events.Key}

src/ol/observable.js, line 83

Listen for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

once(type, listener, opt_this){goog.events.Key}

src/ol/observable.js, line 96

Listen once for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

un(type, listener, opt_this)

src/ol/observable.js, line 109

Unlisten for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object which was used as this by the listener.

unByKey(key)

src/ol/observable.js, line 122

Removes an event listener using the key returned by on() or once(). Note that using the ol.Observable.unByKey static function is to be preferred.

Name	Type	Description
key	goog.events.Key	The key returned by on() or once().