AJAX revisited

[Christoph Baudson]

Hi there,

in a recent experiment with jQuery I added some AJAX-functionality to 
Mapbender (see http://wms1.ccgis.de/mapbender_dev/, GUI 
gui_digitize_modular).

When a geometry is sent to Geoserver I send the request via AJAX and not 
via a frame:

parent.mb_ajax_get('../extensions/geom2wfst2.php', 
{filter:str,url:myconf['wfs_transaction']}, 
function(xml,status){wfsSubWrite(m,type,status);});

'geom2wfst2.php' sends the geometry to Geoserver; the request is a 
combination of the parameters 'url' and 'filter'.

The new thing is the function wfsSubWrite: it's a callback function, 
invoked when the WFS request is finished. It refreshes the mapframe 
after a geometry has been saved/deleted/updated. There are no more 
synchronization problems.

Another advantage is, that geom2wfst2.php no longer has to handle the 
xml result from Geoserver. It's simply returned to the callback function by

header('Content-type: text/xml');
echo $data;

The callback function can now check if any errors occured (still on my 
to do list). This is the modular approach that we are after.

Cheers,

Christoph