| --- |
| license: > |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| |
| title: compass.clearWatch |
| --- |
| |
| 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 |
| |
| Quick [Example](../storage/storage.opendatabase.html) |
| ------------- |
| |
| var watchID = navigator.compass.watchHeading(onSuccess, onError, options); |
| |
| // ... later on ... |
| |
| navigator.compass.clearWatch(watchID); |
| |
| Full [Example](../storage/storage.opendatabase.html) |
| ------------ |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Compass Example</title> |
| |
| <script type="text/javascript" charset="utf-8" src="cordova-1.5.0.js"></script> |
| <script type="text/javascript" charset="utf-8"> |
| |
| // The watch id references the current `watchHeading` |
| var watchID = null; |
| |
| // Wait for PhoneGap to load |
| // |
| document.addEventListener("deviceready", onDeviceReady, false); |
| |
| // PhoneGap 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> |
