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| <!-- Show warnings for special versions --> |
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| <button type="button" class="close" data-dismiss="alert" aria-label="Close"> |
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| </button> |
| This version of the documentation is outdated! |
| <a href="/docs/en/latest/cordova/accelerometer/accelerometer.watchAcceleration.html"> |
| Click here for the latest released version. |
| </a> |
| </div> |
| |
| |
| <!-- plugin version warning --> |
| |
| |
| <div id="page-toc-source"> |
| <h1>accelerometer.watchAcceleration</h1> |
| |
| <p>At a regular interval, get the acceleration along the x, y, and z axis.</p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>var watchID = navigator.accelerometer.watchAcceleration(accelerometerSuccess, |
| accelerometerError, |
| [accelerometerOptions]); |
| </code></pre></div></div> |
| |
| <h2>Description</h2> |
| |
| <p>The accelerometer is a motion sensor that detects the change (delta) in movement relative to the current position. The accelerometer can detect 3D movement along the x, y, and z axis.</p> |
| |
| <p>The <code>accelerometer.watchAcceleration</code> gets the device's current acceleration at a regular interval. Each time the <code>[Acceleration](acceleration/acceleration.html)</code> is retrieved, the <code>[accelerometerSuccess](parameters/accelerometerSuccess.html)</code> callback function is executed. Specify the interval in milliseconds via the <code>frequency</code> parameter in the <code>acceleratorOptions</code> object.</p> |
| |
| <p>The returned watch ID references references the accelerometer watch interval. The watch ID can be used with <code>[accelerometer.clearWatch](accelerometer.clearWatch.html)</code> to stop watching the accelerometer.</p> |
| |
| <h2>Supported Platforms</h2> |
| |
| <ul> |
| <li>Android</li> |
| <li>BlackBerry WebWorks (OS 5.0 and higher)</li> |
| <li>iPhone</li> |
| <li>Windows Phone 7 (Mango)</li> |
| <li>Bada 1.2 & 2.x</li> |
| </ul> |
| |
| <h2>Quick <a href="../storage/storage.opendatabase.html">Example</a></h2> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>function onSuccess(acceleration) { |
| alert('Acceleration X: ' + acceleration.x + '\n' + |
| 'Acceleration Y: ' + acceleration.y + '\n' + |
| 'Acceleration Z: ' + acceleration.z + '\n' + |
| 'Timestamp: ' + acceleration.timestamp + '\n'); |
| }; |
| |
| function onError() { |
| alert('onError!'); |
| }; |
| |
| var options = { frequency: 3000 }; // Update every 3 seconds |
| |
| var watchID = navigator.accelerometer.watchAcceleration(onSuccess, onError, options); |
| </code></pre></div></div> |
| |
| <h2>Full <a href="../storage/storage.opendatabase.html">Example</a></h2> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code><!DOCTYPE html> |
| <html> |
| <head> |
| <title>Acceleration Example</title> |
| |
| <script type="text/javascript" charset="utf-8" src="cordova-1.8.0.js"></script> |
| <script type="text/javascript" charset="utf-8"> |
| |
| // The watch id references the current `watchAcceleration` |
| var watchID = null; |
| |
| // Wait for Cordova to load |
| // |
| document.addEventListener("deviceready", onDeviceReady, false); |
| |
| // Cordova is ready |
| // |
| function onDeviceReady() { |
| startWatch(); |
| } |
| |
| // Start watching the acceleration |
| // |
| function startWatch() { |
| |
| // Update acceleration every 3 seconds |
| var options = { frequency: 3000 }; |
| |
| watchID = navigator.accelerometer.watchAcceleration(onSuccess, onError, options); |
| } |
| |
| // Stop watching the acceleration |
| // |
| function stopWatch() { |
| if (watchID) { |
| navigator.accelerometer.clearWatch(watchID); |
| watchID = null; |
| } |
| } |
| |
| // onSuccess: Get a snapshot of the current acceleration |
| // |
| function onSuccess(acceleration) { |
| var element = document.getElementById('accelerometer'); |
| element.innerHTML = 'Acceleration X: ' + acceleration.x + '<br />' + |
| 'Acceleration Y: ' + acceleration.y + '<br />' + |
| 'Acceleration Z: ' + acceleration.z + '<br />' + |
| 'Timestamp: ' + acceleration.timestamp + '<br />'; |
| } |
| |
| // onError: Failed to get the acceleration |
| // |
| function onError() { |
| alert('onError!'); |
| } |
| |
| </script> |
| </head> |
| <body> |
| <div id="accelerometer">Waiting for accelerometer...</div> |
| </body> |
| </html> |
| </code></pre></div></div> |
| |
| <h2>iPhone Quirks</h2> |
| |
| <ul> |
| <li>At the interval requested, Cordova will call the success callback function and pass the accelerometer results.</li> |
| <li>However, in requests to the device Cordova restricts the interval to minimum of every 40ms and a maximum of every 1000ms. |
| <ul> |
| <li>For example, if you request an interval of 3 seconds (3000ms), Cordova will request an interval of 1 second from the device but invoke the success callback at the requested interval of 3 seconds.</li> |
| </ul> |
| </li> |
| </ul> |
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