On Sat, Sep 19, 2009 at 7:47 PM, P Kishor <[email protected]> wrote: > I have a bizarre problem that I can't debug. My code is > > var info = new OpenLayers.Control.WMSGetFeatureInfo({ > url: "http://localhost/cgi-bin/mapserv?map=/path/to/my.map&";, > maxFeatures: 12, > title: 'Identify features by clicking', > queryVisible: true, > layers: [wms_cds_stands], > infoFormat: "text/plain", > eventListeners: { > getfeatureinfo: function(event) { > map.addPopup(new OpenLayers.Popup.FramedCloud( ... ), > true); > } > } > }); > map.addControl(info); > info.activate(); > > If I change the url to "http://localhost/cgi-bin/mapserv"; it fires > correctly on click, and a framed cloud pops up with the error message > that CGI variable map is not declared. However, if I add the map > variable to the query string as shown above, then the event doesn't > fire on click at all. There is no proxy nor remote host involved. > Everything is on localhost. Doesn't matter if the url starts with > "http://localhost/cgi-bin//mapserv"; or just "/cgi-bin//mapserv", it is > the presence of the url query string that seems to cause the click > event to not fire at all. > > What could I do to correct this? >
So, after two days of struggling with this, I figured it out. Turns out, my layer was defined like so... var wms_cds_stands = new OpenLayers.Layer.WMS( "CDS Stands", "http://localhost/cgi-bin/mapserv";, { map: "/path/to/my.map", layers : "cds_stands", map_imagetype: "agga", transparent: true }, { reproject: true, singleTile: true } ); and my WMSGetFeatureInfo control had url set like so url: "http://localhost/cgi-bin/mapserv?map=/Users/punkish/Data/cnnf/cnnf.map&"; Well, the urlMatches() function in WMSGetFeatureInfo class was causing my control to fail. The url for my layer definition did not have the map parameter attached as a query string. Instead, it was provided as a separate parameter in the params hash supplied to the object constructor. However, the control constructor does not provide a similar facility to supply the map value separately. I changed my mapserver url in the layer constructor to "http://localhost/cgi-bin/mapserv?map=/Users/punkish/Data/cnnf/cnnf.map&"; and now since urlMatches() returns true for the two urls, the click event fires and I get a popup bubble. Once again, I ask, was there a more efficient and obvious way for me to discover this? OpenLayers is an absolutely fantastic piece of work which is severely hampered by its documentation, UNLESS, there is a strategy to discovering how it works that I am completely missing. I am determined to using OL and making it a showcase in my work, so I can also evangelize it to others as a replacement for Google or Yahoo maps. But, right now, either its documentation, or the way I am going about it, is tripping me up severely. Any advice from you more seasoned folks is very welcome. -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science ======================================================================= Sent from Madison, WI, United States _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
