[OpenLayers-Users] FeatureInfo-Popup not returning results

[Marc Jansen]

Hi Sven,

which error do you get in firebug? Just guessing: could it be that you 
run into the same origin policy 
(http://en.wikipedia.org/wiki/Same_origin_policy)? Do the mapserver and 
the webserver share the same origin?

If not, you'll need a proxy, and OpenLayers provides one for you: 
http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#ProxyHost

If you see a different error, we'll need more details about it.

Regards,
Marc


n 24.08.2010 12:36, Sven Burbeck wrote:
> Hi Marc,
> thanks for your hint regarding the vendorParams. It at least solves
> part of the problem (passing the URl to the constructor didn't work).
> I now produce a request that has the "map" parameter and the request
> gets a response from the server (format=html).
>
> However, GeoExt.popup opens but is still blank and doesn't show the html.
> Firebug throws an error (just the GET request) although I can take
> this request and get a proper response from the server.
>
> any idea?
>
> cheers,
> Sven
>
>
>
> Quoting "Marc Jansen"<jansen at terrestris.de>:
>
>    
>> Hi Sven,
>>
>> The error message you see come from UMN mapserver moaning about the
>> missing URL parameter MAP, not the OpenLayers Map.
>>
>> Have you tried to pass over an URL to the Constructor of the control
>> (this isn't documented in the API, but maybe should be)?
>>
>> featureInfo = new OpenLayers.Control.WMSGetFeatureInfo({
>>     url : 'http://example.com/mapserver?map=/path/to/mapfile.map'
>> });
>>
>>
>> If the above fails, you could use the non-API-property "vendorParams" (I
>> cannot see a reason why this is a hidden option):
>>
>> featureInfo = new OpenLayers.Control.WMSGetFeatureInfo({
>>     vendorParams: {
>>       map: '/path/to/mapfile.map'
>>     }
>> });
>>
>> If both work, I'd go with the vendorParams, because that is what UMN
>> Mapservers MAP url parameter is.
>>
>> Untested, hope it helps,
>>
>> Marc
>>
>>
>>
>> On 24.08.2010 11:00, Sven Burbeck wrote:
>>      
>>> Hi list,
>>> I'm struggling to show GetFeatureInfo results in a GeoExtPopup.
>>> I used the sample code for openLayers / GeoExt.popup.
>>> That's the code:
>>> ...
>>>       var featureInfo = new OpenLayers.Control.WMSGetFeatureInfo();
>>>               featureInfo.events.on({
>>>                   getfeatureinfo: function(e) {
>>>                       new GeoExt.Popup({
>>>                           title: "Info",
>>>                           width: 200,
>>>                           height: 150,
>>>                           autoScroll: true,
>>>                           maximizable: true,
>>>                           map: map,
>>>                           lonlat: map.getLonLatFromPixel(e.xy),
>>>                           html: e.text
>>>                       }).show();
>>>                   }
>>>               });
>>>
>>>       map.addControl(featureInfo);
>>>       featureInfo.activate();
>>> ...
>>> My WMS comes from MapServer (and FeatureInfo apparently works on the
>>> selected layers).
>>> When checking the request (copied from firebug) directly in the browser
>>> I get the following error message:
>>> 'loadMap(): Web application error. CGI variable "map" is not set.'
>>>
>>> And that's actually true. When adding the "map" parameter manually
>>> everything works well.
>>> However, I thought the requests "map" and "layers" parameter were given
>>> by "map:map".
>>>
>>> Maybe I simply missed something but currently I don't know what.
>>>
>>>
>>> cheerrs,
>>> Sven
>>>
>>>
>>>        
>>