Hi Mike,
Thanks for the suggestions. As I mentioned, I have very little knowledge of
Javascript but I see the gist of your code. I will let you know the outcome
in due course.
Thanks again
Les Bradbury
----- Original Message -----
From: "Mike Williams" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 03, 2009 6:24 PM
Subject: Re: Latitude and longitude to easting and northing
> 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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