Revision 1132579 of MediaDevices.ondevicechange

<p>{{APIRef("Media Capture and Streams")}}</p>

<p><span class="seoSummary">The <strong><code>MediaDevices.ondevicechange</code></strong> property is an {{domxref("EventHandler")}} which specifies a function to be called when the {{event("devicechange")}} event occurs on a {{domxref("MediaDevices")}} instance. This happens whenever the set of media devices available to the {{Glossary("user agent")}} and, by extension, to the web site or app. You can at any time use {{domxref("MediaDevices.enumerateDevices", "enumerateDevices()")}} to get the updated list of available devices.</span></p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">
<em>MediaDevices</em>.ondevicechange = <em>eventHandler</em>;
</pre>

<h3 id="Value">Value</h3>

<p>A function you provide which accepts as input a {{domxref("Event")}} object describing the {{domxref("devicehange")}} event that occurred. There is no information about the change included in the event object; to get the updated list of devices, you'll have to use {{domxref("MediaDevices.enumerateDevices", "enumerateDevices()")}}.</p>

<h2 id="Example">Example</h2>

<p>tbd</p>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{ SpecName('Media Capture', '#event-mediastream-devicechange', 'devicechange') }}</td>
   <td>{{ Spec2('Media Capture') }}</td>
   <td>Initial specification.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>{{CompatibilityTable}}</div>

<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>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop(51)}}</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>Android Webview</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] While support for the <code>devicechange</code> event and for {{domxref("MediaDevices.ondevicechange")}} landed in Firefox 51, but <em>only for Mac</em>, and disabled by default. It can be enabled by setting the preference <code>media.ondevicechange.enabled</code> to true. Support for this event was added for Linux and Windows—and it was enabled by default—starting in Firefox 52.</p>

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

<ul>
 <li>The {{event("devicechange")}} event and its type, {{domxref("Event")}}.</li>
 <li>{{domxref("MediaDevices.enumerateDevices()")}}</li>
 <li>{{domxref("MediaDeviceInfo")}}</li>
</ul>