Browser based Javascript to get user's location using html5 geolocation API and reverse geocoding service of Google Maps.

Userlocation.js

var getAddr = function(lat, lng) {
    console.log("getting addr ");
    var latlng = new google.maps.LatLng(lat, lng);
    var geocoder = geocoder = new google.maps.Geocoder();
    geocoder.geocode({
        'latLng': latlng
    }, function(results, status) {
        console.log("geocode result: ", results, " and status: ", status);
        if (status == google.maps.GeocoderStatus.OK) {
            if (results[0]) {
                console.log("Location: ", results[0].formatted_address);
                document.getElementById("faddress").value = results[0].formatted_address;
            }
        }

    });

}

var geoSuccess = function(position) {
    startPos = position;
    console.log({
        lat: startPos.coords.latitude,
        lng: startPos.coords.longitude
    });
    getAddr(startPos.coords.latitude, startPos.coords.longitude);

};
var geoError = function(error) {
    console.log('Error occurred. Error code: ' + error.code);
    // error.code can be:
    //   0: unknown error
    //   1: permission denied
    //   2: position unavailable (error response from location provider)
    //   3: timed out
};

var geoOptions = {
    enableHighAccuracy: true
}

var getLocation = function() {
    console.log("starting getting user location");
    navigator.geolocation.getCurrentPosition(geoSuccess, geoError, geoOptions);
}


var script = document.createElement("script");
script.type = 'text/javascript';
script.src = "https://maps.googleapis.com/maps/api/js?sensor=true&key=ADD_YOUR_API_KEY_HERE&callback=getLocation";
document.body.appendChild(script);