EventTarget is an interface implemented by objects that can receive events and may have listeners for them.

Element, document, and window are the most common event targets, but other objects can be event targets too, for example XMLHttpRequest, AudioNode, AudioContext, and others.

Many event targets (including elements, documents, and windows) also support setting event handlers via on... properties and attributes.


Register an event handler of a specific event type on the EventTarget.
Removes an event listener from the EventTarget.
Dispatch an event to this EventTarget.

Additional methods for Mozilla chrome code

Mozilla extensions for use by JS-implemented event targets to implement on* properties. See also WebIDL bindings.

  • void setEventHandler(DOMString type, EventHandler handler)
  • EventHandler getEventHandler(DOMString type)


Simple implementation of EventTarget

var EventTarget = function() {
  this.listeners = {};
EventTarget.prototype.listeners = null;
EventTarget.prototype.addEventListener = function(type, callback) {
  if (!(type in this.listeners)) {
    this.listeners[type] = [];
EventTarget.prototype.removeEventListener = function(type, callback) {
  if (!(type in this.listeners)) {
  var stack = this.listeners[type];
  for (var i = 0, l = stack.length; i < l; i++) {
    if (stack[i] === callback){
      stack.splice(i, 1);
EventTarget.prototype.dispatchEvent = function(event) {
  if (!(event.type in this.listeners)) {
    return true;
  var stack = this.listeners[event.type];
  event.target = this;
  for (var i = 0, l = stack.length; i < l; i++) {
    stack[i].call(this, event);
  return !event.defaultPrevented;


Specification Status Comment
The definition of 'EventTarget' in that specification.
Living Standard No change.
Document Object Model (DOM) Level 3 Events Specification
The definition of 'EventTarget' in that specification.
Working Draft A few parameters are now optional (listener), or accepts the null value (useCapture).
Document Object Model (DOM) Level 2 Events Specification
The definition of 'EventTarget' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 (Yes) 1.0 (1.7 or earlier) 9.0 7 1.0[1]
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 1.0 (Yes) 1.0 (1) 9.0 6.0 1.0

[1] window.EventTarget does not exist.

See Also

Document Tags and Contributors

 Last updated by: trusktr,