EventDispatcher

JavaScript custom events.

Code Example

// adding events to a custom object class Car extends EventDispatcher { start() { this.dispatchEvent({ type: 'start', message: 'vroom vroom!' }); } }; // using events with the custom object const car = new Car(); car.addEventListener('start', function(event) { alert(event.message); }); car.start();

Constructor

EventDispatcher()

Creates EventDispatcher object.

Methods

.addEventListener(type : String, listener : Function)

type — The type of event to listen to.
listener — The function that gets called when the event is fired.

Adds a listener to an event type.

.hasEventListener(type : String, listener : Function) → Boolean

type — The type of event to listen to.
listener — The function that gets called when the event is fired.

Checks if listener is added to an event type.

.removeEventListener(type : String, listener : Function)

type — The type of the listener that gets removed.
listener — The listener function that gets removed.

Removes a listener from an event type.

.dispatchEvent(event : Object)

event — The event that gets fired.

Fire an event type.

Puzzles

There is a set of puzzles that implements similar functionality in a visual manner:

Source

For more info on how to obtain the source code of this module see this page.