Re: [OpenLayers-Dev] use of GetFeatureInfo with MapServer file

[Roald de Wit]

Hi,

This list is intended for when you *develop* OpenLayers, ie: if you're 
modifying OpenLayers classes, creating subclasses, or otherwise getting 
into the guts of OpenLayers.

Your questions are questions about how to *use* OpenLayers and 
MapServer. Please use the following lists for them:

OpenLayers:
http://lists.osgeo.org/mailman/listinfo/openlayers-users

MapServer:
http://lists.osgeo.org/mailman/listinfo/mapserver-users

Regards, Roald


On 28/09/11 21:05, jcbpro81 wrote:
Hello everyone,

I'm new with OpenLayers and MapServer.
I'm looking for a way to get informations on a feature clicked on a map,
like on the following link :
http://openlayers.org/dev/examples/getfeatureinfo-control.html

Here is my environment:
OpenLayers load only one layer of type "OpenLayers.Layer.MapServer".
The mapfile contains 4 postgis layers, and I want to be able to retrieve
informations from one of them.

Here is the JavaScript I have for now according to the GetFeatureInfo, code
found by looking on Google :

-------------------------------------------------------------------------------------------

            layer = new OpenLayers.Layer.MapServer("myMap", "url", {map:
'file.map'});
                
         map.addLayers([layer]);

         map.events.register('click', map, function(evt) {
             document.getElementById("infoResult").innerHTML = "Recherche en
cours..."
             var url = layer.getFullRequestString({
                 REQUEST: "GetFeatureInfo",
                        EXCEPTIONS: "application/vnd.ogc.se_xml",
                 STYLES: "",
                 BBOX: map.getExtent().toBBOX(),
                 X: evt.xy.x,
                 Y: evt.xy.y,
                 QUERY_LAYERS: "myLayer",
                 FEATURE_COUNT: 1,
                 WIDTH: map.size.w,
                 HEIGHT: map.size.h,
                 INFO_FORMAT: 'text/html'
             });
             //alert(url);
                OpenLayers.loadURL(url, '', this, setInfoResult);
                Event.stop(evt);
        });

        // ....
                
        function setInfoResult(response) {
         //alert(response);
                document.getElementById("infoResult").innerHTML = 
response.responseText;
      }

-------------------------------------------------------------------------------------------

When I click anywhere on the map, the "infoResult" shows "?PNG  " (the
display is a square next to "PNG" characters).
So I'm questionning myself on what I'm doing wrong.
About the QUERY_LAYERS parameter, with value "myLayer", do I have to put the
name of the layer loaded with OpenLayers ("myMap") or the name of a layer
inside of my mapfile ("myLayer") ?
Is this code can work with postgis layers ?
Do I have to work in another way ?

I find that OpenLayers online help
(http://dev.openlayers.org/releases/OpenLayers-2.9/doc/apidocs/index/General.html)
isn't really "user friendly" and hard to understand.
I spent lot of days to be able to simply display a map.

Any help will be much apprecied.

Thanks in advance.

Regards,

--
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