compass.clearWatch

Stop watching the compass referenced by the watch ID parameter.

navigator.compass.clearWatch(watchID);
  • watchID: The ID returned by [compass.watchHeading](compass.watchHeading.html).

Supported Platforms

  • Android
  • iPhone
  • Windows Phone 7 ( Mango ) if available in hardware
  • Bada 1.2 & 2.x
  • webOS

Quick Example

var watchID = navigator.compass.watchHeading(onSuccess, onError, options);

// ... later on ...

navigator.compass.clearWatch(watchID);

Full Example

<!DOCTYPE html>
<html>
  <head>
    <title>Compass 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 `watchHeading`
    var watchID = null;
    
    // Wait for Cordova to load
    //
    document.addEventListener("deviceready", onDeviceReady, false);

    // Cordova is ready
    //
    function onDeviceReady() {
        startWatch();
    }

    // Start watching the compass
    //
    function startWatch() {
        
        // Update compass every 3 seconds
        var options = { frequency: 3000 };
        
        watchID = navigator.compass.watchHeading(onSuccess, onError, options);
    }
    
    // Stop watching the compass
    //
    function stopWatch() {
        if (watchID) {
            navigator.compass.clearWatch(watchID);
            watchID = null;
        }
    }
    
    // onSuccess: Get the current heading
    //
    function onSuccess(heading) {
        var element = document.getElementById('heading');
        element.innerHTML = 'Heading: ' + heading.magneticHeading;
    }

    // onError: Failed to get the heading
    //
    function onError(compassError) {
        alert('Compass error: ' + compassError.code);
    }


    </script>
  </head>
  <body>
    <div id="heading">Waiting for heading...</div>
    <button onclick="startWatch();">Start Watching</button>
    <button onclick="stopWatch();">Stop Watching</button>
  </body>
</html>