Yeah, you're going to need to get it to work in atomic time was well to simultaneously update the positions your describing. So, this is probably going to recall some sort of ajax function tied to each client spitting the position data into a server-side script and spitting the updated position data back into the map. My guess is some sort of event listener on the feature the user is positioning, and then on the back-end a multi-user transactional database which stores and updates all the positions on the map...<div>
<br></div><div>So client-side you need your user interaction with the feature, you should look into the various controls OL has which let you interact with features in the map, and will probably get some of the functionality you want. The ajax function here will have to update the server with the user's position in order to be able to give that data to other users. </div>
<div><br></div><div>I have no idea how you'd implement this on the server, but you're going to have to have each user be able to modify some sort of spatial database with each user logged into your application. So that's another piece you'll need, some sort of server-side login mechanism, which gives users access to modify the table/dataset of users and positions. </div>
<div><br></div><div>Updating that database is going have to happen pretty often, so you'll need something transactional and probably some sort of complicated SQL...good luck!<br><br><div class="gmail_quote">On Mon, Jun 6, 2011 at 4:50 AM, Rossko <span dir="ltr"><<a href="mailto:rossko@culzean.clara.co.uk">rossko@culzean.clara.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">> I need a saveStrategy and a way to save that changes (position, attributes<br>
of the point) at a central point.<br>
<br>
</div>That's outside the scope of OpenLayers ; you are going to need some kind of<br>
multiuser database. Choice of what to use may be forced upon you, by what<br>
kind of server-side resources are available to you or what environment you<br>
are used to working in.<br>
<div class="im"><br>
> I read something about geojson. Could this match to my problem?<br>
<br>
</div>It's just a data transport mechanism, it won't do any saving or updating for<br>
you, although it could be part of your solution.<br>
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