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+---
+title: EventTarget
+slug: Web/API/EventTarget
+tags:
+ - API
+ - DOM
+ - DOM Events
+ - Interface
+ - NeedsTranslation
+ - TopicStub
+translation_of: Web/API/EventTarget
+---
+<p>{{ApiRef("DOM Events")}}</p>
+
+<p><code>EventTarget</code> is an interface implemented by objects that can receive events and may have listeners for them.</p>
+
+<p>{{domxref("Element")}}, {{domxref("document")}}, and {{domxref("window")}} are the most common event targets, but other objects can be event targets too, for example {{domxref("XMLHttpRequest")}}, {{domxref("AudioNode")}}, {{domxref("AudioContext")}}, and others.</p>
+
+<p>Many event targets (including elements, documents, and windows) also support setting <a href="/en-US/docs/Web/Guide/DOM/Events/Event_handlers">event handlers</a> via <code>on...</code> properties and attributes.</p>
+
+<h2 id="Methods">Methods</h2>
+
+<dl>
+ <dt>{{domxref("EventTarget.addEventListener()")}}</dt>
+ <dd>Register an event handler of a specific event type on the <code>EventTarget</code>.</dd>
+ <dt>{{domxref("EventTarget.removeEventListener()")}}</dt>
+ <dd>Removes an event listener from the <code>EventTarget</code>.</dd>
+ <dt>{{domxref("EventTarget.dispatchEvent()")}}</dt>
+ <dd>Dispatch an event to this <code>EventTarget</code>.</dd>
+</dl>
+
+<h3 id="Additional_methods_for_Mozilla_chrome_code">Additional methods for Mozilla chrome code</h3>
+
+<p>Mozilla extensions for use by JS-implemented event targets to implement on* properties. See also <a href="/en-US/docs/Mozilla/WebIDL_bindings">WebIDL bindings</a>.</p>
+
+<ul>
+ <li>void <strong>setEventHandler</strong>(DOMString type, EventHandler handler) {{non-standard_inline}}</li>
+ <li>EventHandler <strong>getEventHandler</strong>(DOMString type) {{non-standard_inline}}</li>
+</ul>
+
+<h2 id="Example">Example:</h2>
+
+<h3 id="_Simple_implementation_of_EventTarget" name="_Simple_implementation_of_EventTarget">Simple implementation of EventTarget</h3>
+
+<pre class="brush: js">var EventTarget = function() {
+ this.listeners = {};
+};
+
+EventTarget.prototype.listeners = null;
+EventTarget.prototype.addEventListener = function(type, callback) {
+ if(!(type in this.listeners)) {
+ this.listeners[type] = [];
+ }
+ this.listeners[type].push(callback);
+};
+
+EventTarget.prototype.removeEventListener = function(type, callback) {
+ if(!(type in this.listeners)) {
+ return;
+ }
+ var stack = this.listeners[type];
+ for(var i = 0, l = stack.length; i &lt; l; i++) {
+ if(stack[i] === callback){
+ stack.splice(i, 1);
+ return this.removeEventListener(type, callback);
+ }
+ }
+};
+
+EventTarget.prototype.dispatchEvent = function(event) {
+ if(!(event.type in this.listeners)) {
+ return;
+ }
+ var stack = this.listeners[event.type];
+ event.target = this;
+ for(var i = 0, l = stack.length; i &lt; l; i++) {
+ stack[i].call(this, event);
+ }
+};
+</pre>
+
+{{ EmbedLiveSample('_Simple_implementation_of_EventTarget') }}
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM WHATWG', '#interface-eventtarget', 'EventTarget')}}</td>
+ <td>{{Spec2('DOM WHATWG')}}</td>
+ <td>No change.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM3 Events', 'DOM3-Events.html#interface-EventTarget', 'EventTarget')}}</td>
+ <td>{{Spec2('DOM3 Events')}}</td>
+ <td>A few parameters are now optional (<code>listener</code>), or accepts the <code>null</code> value (<code>useCapture</code>).</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM2 Events', 'events.html#Events-EventTarget', 'EventTarget')}}</td>
+ <td>{{Spec2('DOM2 Events')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari (WebKit)</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>1.0</td>
+ <td>{{CompatGeckoDesktop("1")}}</td>
+ <td>9.0</td>
+ <td>7</td>
+ <td>1.0<sup>[1]</sup></td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>1.0</td>
+ <td>{{CompatGeckoMobile("1")}}</td>
+ <td>9.0</td>
+ <td>6.0</td>
+ <td>1.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] <code>window.EventTarget</code> does not exist.</p>
+
+<h2 id="See_Also">See Also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/Reference/Events">Event reference</a> - the events available in the platform.</li>
+ <li><a href="/en-US/docs/Web/Guide/DOM/Events">Event developer guide</a></li>
+ <li>{{domxref("Event")}} interface</li>
+</ul>