Baseline Widely available
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The watchPosition() method of the Geolocation interface 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.
Note that in addition to requiring a secure context this feature may be blocked by the geolocation Permissions-Policy, and also requires that explicit permission be granted by the user. If required, the user will be prompted when this method is called. The permission state can be queried using the geolocation user permission in the Permissions API.
watchPosition(success)
watchPosition(success, error)
watchPosition(success, error, options)
success
A callback function that takes a GeolocationPosition object as an input parameter.
error Optional
An optional callback function that takes a GeolocationPositionError object as an input parameter.
options Optional
An optional object that provides configuration options for the location watch. See Geolocation.getCurrentPosition() for more details on possible options.
An integer ID that identifies the registered handler. The ID can be passed to the Geolocation.clearWatch() to unregister the handler.
let id;
let target;
let options;
function success(pos) {
const crd = pos.coords;
if (target.latitude === crd.latitude && target.longitude === crd.longitude) {
console.log("Congratulations, you reached the target");
navigator.geolocation.clearWatch(id);
}
}
function error(err) {
console.error(`ERROR(${err.code}): ${err.message}`);
}
target = {
latitude: 0,
longitude: 0,
};
options = {
enableHighAccuracy: false,
timeout: 5000,
maximumAge: 0,
};
id = navigator.geolocation.watchPosition(success, error, options);
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