gistfile1.js

function getLocation(){
	if (navigator.geolocation){
		navigator.geolocation.getCurrentPosition(getAddress);
	} else{
		alert("Geolocation is not supported by this browser.");
	}	
}

function getAddress(position){
	var lat = position.coords.latitude;
	var lon = position.coords.longitude;
	var apiurl = 'http://maps.googleapis.com/maps/api/geocode/json?latlng='+lat+','+lon+'&sensor=true';
	var xhr = new XMLHttpRequest();
	xhr.open("GET", apiurl);
	xhr.onload = function() {
		if(this.status==200){
			var data = JSON.parse(xhr.responseText);
			var address = data.results[0]
     			putInDom(address.formatted_address);
		} else {
     			info.innerHTML = "Could not find your location.";
		}
	}
	xhr.send();          
}

function putInDom(address){
  	var location = document.getElementById("location");
  	var a = address.split(",");
  	location.value = a[1].trim()+", "+a[2].trim().split(" ")[0];
}