Revision 969499 of MessageEvent

<div>{{APIRef("HTML DOM")}}</div>

<p>A <code><strong>MessageEvent</strong></code> is the interface representing a message received by a target, being a {{domxref("WebSocket")}} or a WebRTC {{domxref("RTCDataChannel")}}</p>

<p>The action triggered by this event is set via an event handler set on {{domxref("WebSocket.onmessage")}} or {{domxref("RTCDataChannel.onmessage")}}.</p>

<p>{{AvailableInWorkers}}</p>

<h2>Constructor</h2>

<dl>
 <dt>{{domxref("MessageEvent.MessageEvent", "MessageEvent()")}}</dt>
 <dd>Creates a new <code>MessageEvent</code>.</dd>
</dl>

<h2>Properties</h2>

<p><em>This interface also inherits properties from its parent, {{domxref("Event")}}.</em></p>

<dl>
 <dt>{{domxref("MessageEvent.data")}} {{ReadonlyInline}}</dt>
 <dd>Returns a {{domxref("DOMString")}}, {{domxref("Blob")}} or an {{domxref("ArrayBuffer")}} containing the data send by the emitter.</dd>
 <dt>{{domxref("MessageEvent.origin")}}</dt>
 <dd>Is a {{domxref("DOMString")}} …</dd>
 <dt>{{domxref("MessageEvent.ports")}}</dt>
 <dd>…</dd>
 <dt>{{domxref("MessageEvent.source")}}</dt>
 <dd>…</dd>
</dl>

<h2>Methods</h2>

<p><em>This interface also inherits methods from its parent, {{domxref("Event")}}.</em></p>

<dl>
 <dt>{{domxref("MessageEvent.initMessageEvent()")}} {{deprecated_inline}}</dt>
 <dd>… <strong>Do not use this anymore</strong>: use the {{domxref("MessageEvent.MessageEvent", "MessageEvent()")}} constructor instead.</dd>
</dl>

<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</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatGeckoDesktop("2.0")}}<sup>[1]</sup></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</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>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] As of {{Gecko("11.0")}}, Gecko supports <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer">ArrayBuffer</a></code> for data, but not {{domxref("Blob")}}.</p>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/API/WebSocket_API">WebSocket API</a></li>
 <li><a href="/en-US/docs/Web/API/WebRTC_API">WebRTC API</a></li>
</ul>