<script src="https://www.googleapis.com/geolocation/v1/geolocate?key=TWOJKLUCZ&sensor=true&libraries=places,weather" async defer>
</script>

<script>
window.onload=getMyLocation();

function getMyLocation(){
	if(navigator.geolocation){
		navigator.geolocation.getCurrentPosition(displayLocation);
	}else {
		alert("cos nie bagla");
	}
}

function displayLocation(position){
	alert(position.coords.longitude);
}
</script>