JavaScript Geolocation Get updates when a user's location changes


Example

You can also receive regular updates of the user's location; for example, as they move around while using a mobile device. Location tracking over time can be very sensitive, so be sure to explain to the user ahead of time why you're requesting this permission and how you'll use the data.

if (navigator.geolocation) {
    //after the user indicates that they want to turn on continuous location-tracking
    var watchId = navigator.geolocation.watchPosition(updateLocation, geolocationFailure);
} else {
    console.log("Geolocation is not supported by this browser.");
}

var updateLocation = function(position) {
    console.log("New position at: " + position.coords.latitude + ", " + position.coords.longitude);
};

To turn off continuous updates:

navigator.geolocation.clearWatch(watchId);