Hi list,
I've been wresting with the following use case for quite some time now, so I
am seeking advice here.
My use case is the following:
1) I have a layer which is of type OpenLayers.Layer.WMS
2) to get the WFS associated with this layer, I perform an SLD WMS
DescribeLayer request, this gives me back the location of the WFS and the
name of the typename
3) using the info from step 2), I perform a WFS DescribeFeatureType request
and parse the result in order to get a list of attributes for this layer.
I've got this code working using a sequence of OpenLayers.LoadURL calls, but
now I want to create a utility function which wraps the above functionality
into 1 function. Can this be done without reverting to a synchronous call? I
need the response from 2) in order to do 3).
I.e. this is what I have now:
var url = layer.getFullRequestString({REQUEST: "DescribeLayer"});
OpenLayers.loadURL(url, '', this, this.parseDescribeLayer);
..
parseDescribeLayer: function(response) {
// parse the result and call a DescribeFeatureType on the WFS
..
OpenLayers.loadURL(url, '', this, this.parseAttributes);
}
..
parseAttributes: function(response) {
var descfeaturetype = new OpenLayers.Format.WFSDescribeFeatureType();
var attributes = descfeaturetype.read(response.responseText);
this.layer.attributes = attributes;
}
What I would want to do is:
OpenLayers.Util.getAttributes(layer)
which performs all of the above and only returns when it has finished all
operations.
Best regards,
Bart
--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl
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