Event

Event

new

A generic utility class for managing subscribers for a particular event. This class is usually instantiated inside of a container class and exposed as a property for others to subscribe to.

Example
MyObject.prototype.myListener = function(arg1, arg2) {
    this.myArg1Copy = arg1;
    this.myArg2Copy = arg2;
}

var myObjectInstance = new MyObject();
var evt = new Cesium.Event();
evt.addEventListener(MyObject.prototype.myListener, myObjectInstance);
evt.raiseEvent('1', '2');
evt.removeEventListener(MyObject.prototype.myListener);
Source:

Methods

Registers a callback function to be executed whenever the event is raised. An optional scope can be provided to serve as the this pointer in which the function will execute.

Parameters:
Name Type Argument Description
listener Function The function to be executed when the event is raised.
scope Object <optional>
An optional object scope to serve as the this pointer in which the listener function will execute.
Returns:
Function A function that will remove this event listener when invoked.
See:

Gets the number of listeners currently subscribed to the event.

Returns:
Number The number of subscribed listeners.

Raises the event by calling each registered listener with all supplied arguments.

Parameters:
Name Type Description
arguments * This method takes any number of parameters and passes them through to the listener functions.
See:

Unregisters a previously registered callback.

Parameters:
Name Type Argument Description
listener Function The function to be unregistered.
scope Object <optional>
The scope that was originally passed to addEventListener.
Throws:
DeveloperError : listener is not subscribed.
See: