Hi
I have been attempting to use the Geoserver cross-layer filtering
plug-in with my OpenLayers application. What I'm trying to do is get
all point features from layer A that fall within a specified (polygon)
feature in layer B. i.e. I want to select all 'sales' points within a
defined postcode area.
Here is the relevant extract from my code:
Function postcode_sales()
{
var postData = '<wfs:GetFeature\n'
+ ' service="WFS"\n'
+ ' version="1.1.0"\n'
+ ' outputFormat="text/xml;
subtype=gml/3.1.1"\n'
+ ' maxFeatures="500"\n'
+ ' xmlns:wfs="http://www.opengis.net/wfs"\n'
+ ' xmlns:ogc="http://www.opengis.net/ogc"\n'
+ '
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n'
+ ' xmlns:gml="http://www.opengis.net/gml"\n'
+ '
xsi:schemaLocation="http://www.opengis.net/wfs\n'
+ '
http://schemas.opengis.net/wfs/1.1.0/wfs.xsd";>\n'
+ ' <wfs:Query typeName="rs:sales"
srsName="urn:x-ogc:def:crs:EPSG:27700">\n'
+ ' <ogc:Filter
xmlns:ogc="http://www.opengis.net/ogc";>\n'
+ '
<ogc:Within>\n'
+ '
<ogc:PropertyName>the_geom</ogc:PropertyName>\n'
+ '
<ogc:Function name="querySingle">\n'
+ '
<ogc:Literal>rs:PostcodeUnits</ogc:Literal>\n'
+ '
<ogc:Literal>the_geom</ogc:Literal>\n'
+ '
<ogc:Literal>pcu = '+"EH9 1HG"+'</ogc:Literal>\n'
+ '
</ogc:Function>\n'
+ '
</ogc:Within>\n'
+ ' </ogc:Filter>\n'
+ ' </wfs:Query>\n'
+ '</wfs:GetFeature>\n';
var request = new OpenLayers.Request.POST({
url: '/ros/geoserver/wfs',
data: postData,
headers: {
"Content-Type": "text/xml"
},
callback: function (response)
{
// read the response from GeoServer
var format = new OpenLayers.Format.GML.v3({
extractAttributes:true
});
// Remove any previously selected features from
map
map.layers[18].destroyFeatures();
// Add features to vector layer
map.layers[18].addFeatures(format.read(response.responseText));
},
failure: function (response) {
alert("Invalid request");
}
});
}
Unfortunately this doesn't seem to be working. I'm getting a '500
Internal Server Error' response from geoserver:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at
ad...@example.com to inform them of the time this error occurred,
and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>
Clearly I've misconfigured the query somehow, but I can't figure out
where. I've tried the test scenario outlined at
http://docs.geoserver.org/stable/en/user/extensions/querylayer/index.htm
l using the preloaded Geoserver layers and it works perfectly, but I
can't seem to get it to work with my own data layers. I had initially
thought it was because the third argument in the function (i.e.
'<ogc:Literal>pcu = '+"EH9 1HG"+'</ogc:Literal>') is handling a string
rather than a number, but the data in my attribute column 'pcu' is
string type so I don't think this is the problem.
Does anyone have any clues about what's going wrong here?
Thanks
Chris Muir
P Please consider the environment - do you really need to print this email?
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