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    The Geolocation.watchPosition() method is used to register a handler function that will be called automatically each time the position of the device changes. You can also, optionally, specify an error handling callback function.

    This method returns a watch ID value than can be used to unregister the handler by passing it to the Geolocation.clearWatch() method.


    id = navigator.geolocation.watchPosition(success, error, options)


    A callback function that takes a Position object as an input parameter.
    error Optional
    An optional callback function that takes a PositionError object as an input parameter.
    options Optional
    An optional PositionOptions object.


    var id, target, option;
    function success(pos) {
      var crd = pos.coords;
      if (target.latitude === crd.latitude && target.longitude === crd.longitude) {
        console.log('Congratulation, you reach the target');
    function error(err) {
      console.warn('ERROR(' + err.code + '): ' + err.message);
    target = {
      latitude : 0,
      longitude: 0,
    options = {
      enableHighAccuracy: false,
      timeout: 5000,
      maximumAge: 0
    id = navigator.geolocation.watchPosition(success, error, options);


    Specification Status Comment
    Geolocation API Recommendation Initial specification.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 5 3.5 (1.9.1) 9 10.60
    Removed in 15.0
    Reintroduced in 16.0
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support ? ? 4.0 (4) ? 10.60 ?

    See also

    Document Tags and Contributors

    Contributors to this page: teoli
    Last updated by: teoli,
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