HTML5 Geolocation API lets you share your location with your favorite web sites. A JavaScript can capture your latitude and longitude and can be sent to the backend web servers and do fancy location-aware things like finding local businesses or showing your location on a map.

Geolocation API supports the latest browsers and mobile devices nowadays. The geolocation APIs work with a new property of the global navigator object ie. Geolocation object which can be created as follows,

var geolocation = navigator.geolocation;

A geolocation object is a service object that permits widgets to retrieve information about the geographic location of the website access or device.

Geolocation Methods:
The following methods provide by the geolocation object,

The getCurrentPosition() method: This method retrieves the current geographic location of the user or navigator.
The watchPosition() method: This method retrieves periodic updates about the current geographic location of the device.
The clearWatch() method: This method cancels an ongoing watchPosition call.

The following example is an easy and sample code to use any of the above methods,

function getLocation() {
 var geolocation = navigator.geolocation;
 geolocation.getCurrentPosition(showLocation, errorHandler);
}

Here showLocation and errorHandler are callback methods that would be used to get the actual position as explained in the next section and to handle errors if there is any.