What you can do is instead of having your form jump to a new page, use
an onsubmit that takes you to a Javascript function.
That function can send a request to a server and display the reply.
Something like this:
HTML:
<form onsubmit="calculate(); return false" action="#">
<input type="submit" ... />
</form>
<div id="results"></div>
Javascript:
function calculate() {
var lat=map.getCenter().lat();
var lng=map.getCenter().lng();
var url="calculate.php?lat=" +lat+ "&lng=" +lng;
GDownloadUrl(url, function(reply){
document.getElementById("results").innerHTML = reply;
});
}
PHP server calculate.php:
<?php
$lat = $_REQUEST["lat"];
$lng = $_REQUEST["lng"];
$easting = ... ; // I assume you already have code to do
$northing = ... ; // this calculation in PHP
echo $easting . "," . $northing;
?>
The server sends back the result in the format that you want it to
appear, and the client code simply drops that reply into the innerHTML
of the awaiting div.
Actually, you don't really need the form at all. You could simply call
calculate() whenever the map "moveend" event occurs.
--
Mike Williams
http://econym.org.uk/gmap
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