Retrieve latitude and longitude of a draggable pin via Google Maps API V3
I will explain. I managed to have a draggable pin on a map. I want to retrieve the coordinates of this point and put them into two fields: Latitude and Longitude. These coordinates will later be send to a SQL table via PHP. Here is an example of what I intend to do, but instead of several pins, it's just one and it's draggable. The problem is: I'm not even able to display the coordinates of the initial point. And of course when the user moves the pin, I want the coordinates to change as well in the fields. I hope I made myself clear. What did I do wrong? Should I use the Geocoding service?
Here goes the JS:
<script type="text/javascript">
var map;
function initialize() {
var myLatlng = new google.maps.LatLng(40.713956,-74.006653);
var myOptions = {
zoom: 8,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var marker = new google.maps.Marker({
draggable: true,
position: myLatlng,
map: map,
title: "Your location"
});
google.maps.event.addListener(marker,'click',function(overlay,point){
document.getElementById("latbox").value = lat();
document.getElementById("lngbox").value = lng();
});
}
</script>
And the HTML:
<html>
<body onload="initialize()">
<div id="map_canvas" style="width:50%; height:50%"></div>
<div id="latlong">
<p>Latitude: <input size="20" type="text" id="latbox" name="lat" ></p>
<p>Longitude: <input size="20" type="text" id="lngbox" name="lng" ></p>
</div>
</body>
</html>
Answer
Either of these work
google.maps.event.addListener(marker, 'click', function (event) {
document.getElementById("latbox").value = event.latLng.lat();
document.getElementById("lngbox").value = event.latLng.lng();
});
google.maps.event.addListener(marker, 'click', function (event) {
document.getElementById("latbox").value = this.getPosition().lat();
document.getElementById("lngbox").value = this.getPosition().lng();
});
You might also consider using the dragend event also
google.maps.event.addListener(marker, 'dragend', function (event) {
document.getElementById("latbox").value = this.getPosition().lat();
document.getElementById("lngbox").value = this.getPosition().lng();
});