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At a regular interval, get the acceleration along the x, y, and z axis.
var watchID = navigator.accelerometer.watchAcceleration(accelerometerSuccess,
accelerometerError,
[accelerometerOptions]);
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.
The accelerometer.watchAcceleration gets the device's current acceleration at a regular interval. Each time the Acceleration is retrieved, the accelerometerSuccess callback function is executed. Specify the interval in milliseconds via the frequency parameter in the acceleratorOptions object.
The returned watch ID references the accelerometer watch interval. The watch ID can be used with accelerometer.clearWatch to stop watching the accelerometer.
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);
<!DOCTYPE html>
<html>
<head>
<title>Acceleration Example</title>
<script type="text/javascript" charset="utf-8" src="cordova-2.8.0.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>