实例：
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Find latitude and longitude with Google Maps</title>
<script src="http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAgrj58PbXr2YriiRDqbnL1RSqrCjdkglBijPNIIYrqkVvD1R4QxRl47Yh2D_0C1l5KXQJGrbkSDvXFA"
type="text/javascript"></script>
<script type="text/javascript">
function load() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());
var center = new GLatLng(40.7862,-73.9753);
map.setCenter(center, 15);
geocoder = new GClientGeocoder();
var marker = new GMarker(center, {draggable: true});
map.addOverlay(marker);
document.getElementById("lat").innerHTML = center.lat().toFixed(5);
document.getElementById("lng").innerHTML = center.lng().toFixed(5);
GEvent.addListener(marker, "dragend", function() {
var point = marker.getPoint();
map.panTo(point);
document.getElementById("lat").innerHTML = point.lat().toFixed(5);
document.getElementById("lng").innerHTML = point.lng().toFixed(5);
});
GEvent.addListener(map, "moveend", function() {
map.clearOverlays();
var center = map.getCenter();
var marker = new GMarker(center, {draggable: true});
map.addOverlay(marker);
document.getElementById("lat").innerHTML = center.lat().toFixed(5);
document.getElementById("lng").innerHTML = center.lng().toFixed(5);
GEvent.addListener(marker, "dragend", function() {
var point =marker.getPoint();
map.panTo(point);
document.getElementById("lat").innerHTML = point.lat().toFixed(5);
document.getElementById("lng").innerHTML = point.lng().toFixed(5);
});
});
}
}
function showAddress(address) {
var map = new GMap2(document.getElementById("map"));
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());
if (geocoder) {
geocoder.getLatLng(
address,
function(point) {
if (!point) {
alert(address + " not found");
} else {
document.getElementById("lat").innerHTML = point.lat().toFixed(5);
document.getElementById("lng").innerHTML = point.lng().toFixed(5);
map.clearOverlays()
map.setCenter(point, 14);
var marker = new GMarker(point, {draggable: true});
map.addOverlay(marker);
GEvent.addListener(marker, "dragend", function() {
var pt = marker.getPoint();
map.panTo(pt);
document.getElementById("lat").innerHTML = pt.lat().toFixed(5);
document.getElementById("lng").innerHTML = pt.lng().toFixed(5);
});
GEvent.addListener(map, "moveend", function() {
map.clearOverlays();
var center = map.getCenter();
var marker = new GMarker(center, {draggable: true});
map.addOverlay(marker);
document.getElementById("lat").innerHTML = center.lat().toFixed(5);
document.getElementById("lng").innerHTML = center.lng().toFixed(5);
GEvent.addListener(marker, "dragend", function() {
var pt = marker.getPoint();
map.panTo(pt);
document.getElementById("lat").innerHTML = pt.lat().toFixed(5);
document.getElementById("lng").innerHTML = pt.lng().toFixed(5);
});
});
}
}
);
}
}
</script>
</head>
<body onload="load()" onunload="GUnload()" >
<p><b> Find coordinates by moving around the map</b></p> <p>1. Drag and drop the map to broad location. <br/>
2. Zoom in for greater accuracy. <br/>
3. Drag and drop the marker to pinpoint the place. The coordinates are refreshed at the end of each move. </p>
<p><b>Find coordinates using the name and/or address of the place</b></p>
<p>Submit the full location : number, street, city, country. For big cities and famous places, the country is optional. "Bastille Paris" or "Opera Sydney" will do. <br/>
</p>
<form action="#" onsubmit="showAddress(this.address.value); return false">
<p>
<input type="text" size="60" name="address" value="new york ny" />
<input type="submit" value="Search!" />
</p>
</form>
<p align="left">
<table bgcolor="#FFFFCC" width="300">
<tr>
<td><b>Latitude</b></td>
<td><b>Longitude</b></td>
</tr>
<tr>
<td id="lat"></td>
<td id="lng"></td>
</tr>
</table>
</p>
<p>
<div align="center" id="map" style="width: 600px; height: 400px"><br/></div>
</p>
</div>
</body>
</html>
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