Hi Bill, You have to delete the blank in QUERY_LAYERS: "us_interstate,us_states"
A documentation for WMS parameters are availible from OGC. They are responsibable for WMS, WFS and other standards. http://www.opengeospatial.org/standards/wms Arnd Wippermann -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von Bill Thoen Gesendet: Dienstag, 27. Januar 2009 22:59 An: [email protected] Betreff: [OpenLayers-Users] getFeatureInfo() Only Works on One Layer? I've got a WMS layer that has two sub-layers in it and I'm trying to get attribute information from them via a getFeatureInfo request, but I can only get one of them to respond at a time. I've looked at the docs at http://trac.openlayers.org/wiki/GetFeatureInfo and noticed that you can specify several layers with the QUERY_LAYERS parameter, but I'm finding that only the one listed first is active. Also, it's not clear what layer you specify at the root of the request, but it looks like it's supposed to be different from the layers you're querying. Anyway, here's what I'm trying: I open and load the combined layer like so: base = new OpenLayers.Layer.WMS( "Base", "http://192.168.0.250/cgi-bin/mapserv?map=base.map";, { layers: ["us_states", "us_interstate"] } ); map.addLayer(base); And here's the request string I'm sending to MapServer: var url = base.getFullRequestString({ REQUEST: "GetFeatureInfo", EXCEPTIONS: "application/vnd.ogc.se_xml", FORMAT: 'png', BBOX: map.getExtent().toBBOX(), X: event.xy.x, Y: event.xy.y, INFO_FORMAT: 'text/plain', QUERY_LAYERS: "us_interstate, us_states", FEATURE_COUNT: 1, WIDTH: map.size.w, HEIGHT: map.size.h}, "http://192.168.0.250/cgi-bin/mapserv?map=base.map&";); OpenLayers.loadURL(url, '', this, setHTML); Note the QUERY_LAYERS line. As shown here, it responds with interstate attributes only when I click on an interstate roadway feature, but I get nothing when I click on a state. If I reverse the order of these layers in the list, then clicking on a state returns attributes from the us_states table only. Even if I click on a spot where features in both layers coincide, it returns only the attributes for the layer listed first. So how do I use multiple layers in the QUERY_LAYERS parameter, or do I get only one at a time? Also, I just guessed at using the layer called 'base' for the getFeatureInfo oject, what is supposed to beused here? TIA, - Bill Thoen _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
