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---
title: CameraControl.autoFocus()
slug: Web/API/CameraControl/autoFocus
translation_of: Archive/B2G_OS/API/CameraControl/autoFocus
---
<p>{{APIRef("Camera API")}}{{ non-standard_header() }}{{B2GOnlyHeader2('privileged')}}</p>
<h2 id="Resumo">Resumo</h2>
<p>This method attempts to focus the camera. If the camera is able to attempt to focus, a success callback is issued, regardless of whether or not the focusing attempt succeeds. If unable to attempt to focus, an error callback is performed instead.</p>
<p>The success or failure of the focus operation is indicated by the value of a parameter passed into the callback function.</p>
<h2 id="Sintaxe">Sintaxe</h2>
<pre>CameraControl.autoFocus(onsuccess[, onerror]);</pre>
<h3 id="Parametros">Parametros</h3>
<dl>
<dt><code>onsuccess</code></dt>
<dd>A callback function called when a focus attempt is made</dd>
<dt><code>onerror</code> {{optional_inline()}}</dt>
<dd>An optional callback function that accepts an error string as an input parameter; this is called if it's not possible to attempt to focus the camera.</dd>
</dl>
<h2 id="Exemplo">Exemplo</h2>
<pre class="brush: js">function onFocusPossible( success ) {
if ( success ) {
console.log("The image has been focused");
} else {
console.log("The image has not been focused");
}
}
function onFocusNotPossible( error ) {
console.log("The camera is not able to focus anything");
console.log( error );
}
function onAccessCamera( camera ) {
camera.autoFocus(onFocusPossible, onFocusNotPossible);
};
var options = {
camera: navigator.mozCameras.getListOfCameras()[0]
};
navigator.mozCameras.getCamera(options, onAccessCamera)
</pre>
<h2 id="Specification" name="Specification">Especificações</h2>
<p>Not part of any specification; however, this API should be removed when the <a class="external" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html" rel="external" title="http://dev.w3.org/2011/webrtc/editor/getusermedia.html">WebRTC Capture and Stream API</a> has been implemented.</p>
<h2 id="Leia_mais">Leia mais</h2>
<ul>
<li>{{domxref("CameraControl")}}</li>
</ul>
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