[SOLVED] Re: Re: [Mapbender-users] GetFeatureInfo on WMS

Michael Schulz mschulz at webgis.de
Thu Oct 1 03:58:23 EDT 2009 

Hi Robert,

thanks for bringing this up. I haven't made up my mind yet, what the
correct solution would be. We'd need to know how the mapservers handle
this case. Some facts for a discussion:
- the layer parameter is empty because mapbender respects the scale
settings, that is correct.
- Mapserver throws an exception when the layers parameter is empty
(and the mapfile contains no DEFAULT layers)

Should Mapbender respect the min/maxscale settings also for querylayers?

Still thinking... Michael


2009/10/1 Robert Walter <robert-walter at gmx.de>:
> Hi Michael, hi list,
>
> the problem is, that the url in the featureInfoTunnel request contains no LAYERS parameter, when the layer is invisible because of the maxScale setting. That is why the mapserver throws a ServiceException.
>
> Now I have a workaround for my problem. I have changed the "javascript/mod_featureInfoTunnel.php" near line 82.
>
> 81 ...
> 82 mb_ajax_post(path, {'url':currentRequest},function(js_code,status){
> 83     var isServiceException = js_code.search(/<ServiceException/)
> 84     if(js_code && isServiceException == -1){
> 85         if(featureInfoLayerPopup == 'true'){
> 86             ...
>
> Not the nicest code but it works. Now I can use the maxScale setting in conjunction with the featureInfoTunnel module without any error message.
>
> Thanks for your support.
>
> Greetings Robert
>
>
>
> Hi Robert,
>
> I wonder whether UMN Mapserver in this case throws an error at all
> ...? Hmm. Looking at your error message, it gets thrown in
> msLoadWMSGetMapParams. I don't think this function already takes the
> scale into account, it just collects the layers that are given in the
> request and checks whether they exist. When drawing the map it just
> omits them, I guess the same should happen for getFI. I am not totally
> sure about this and happy to be told the opposite.
>
> Could you check your getFeatureInfo Request whether there are any
> other things happening to the layers or querylayers parameter? Are you
> using grouped layers?
>
> Cheers, Michael
>
> 2009/9/30 Robert Walter <robert-walter at gmx.de>:
>> Hi Michael,
>>
>> thanks for your answer.
>>
>> Setting "ficheckbox" to false works for switching the layer manually off. But when
> the setting maxScale in wms settings is set and the layer is invisible because of
> the mapscale, the featureinfo still shows the error.
>>
>> And when I surf through the mapbender application in the wiki-gallery, obviously
> no one uses the maxscale setting in conjunction with the featureinfo tool. So this
> seems to be a known problem.
>>
>> Greetings Robert
>>
>>
>>
>> Hi Robert,
>>
>> as far as I can see it is true, that Mapbender currently doesn't check
>> whether a queryable layer is also visible, and if not visible
>> automatically also disables it's queryability.
>>
>> I think we had some discussion about that issue in the past, because
>> there are use-cases, when you exactly want a layer to be queryable but
>> not visible. The outcome is, that when using treegde with element_var
>> "ficheckbox" set to true, it is up to the user to en-/disable
>> visbility/queryability in the tree by means of seperate checkboxes. If
>> "ficheckbox" is set to false, you'll only get one checkbox per layer,
>> that toggles visbility/queryability combined on or off. So maybe
>> thats's what you're looking for.
>>
>> Cheers, Michael
>>
>>
>> 2009/9/30 Robert Walter <robert-walter at gmx.de>:
>>> Hi,
>>>
>>> I'm using Mapbender 2.6 with a modified copy of gui2. The error message appears if
>> a wms layer is set to invisible or invisible because of it's scale and the
>> featureinfo checkbox is still enabled. I think there should be a dependency
>> between the visibility of a layer and the possibility to make featureinfo
>> requests.
>>>
>>> Greetings Robert
>>>
>>>
>>> Hi,
>>>
>>> could you give us more information on what version of mapbender you
>>> are using? Is this error happening in a standard gui or in a self-made
>>> gui?
>>>
>>> Greetings, Michael
>>>
>>>
>>> 2009/9/28 Robert Walter <robert-walter at gmx.de>:
>>>> Hi list,
>>>>
>>>> I have a problem with getfeatureinfo-requests on WMS-layers. In the mapfile of the
>>> wms a template for each layer is defined. I use the featureinfotunnel with the new
>>> popup-module.
>>>>
>>>> When the wms is enabled and visible in Mapbender the getfeatureinfo-request shows
>>> the correct info. But when the wms is turned off in treegde-module or the
>>> wms-layer is invisible because of its scale, the getfeatureinfo shows the
>>> following error:
>>>>
>>>> <?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?>
>>>> <!DOCTYPE ServiceExceptionReport SYSTEM
>>> "http://schemas.opengis.net/wms/1.1.1/exception_1_1_1.dtd">
>>>> <ServiceExceptionReport version="1.1.1">
>>>> <ServiceException code="LayerNotDefined">
>>>> msWMSLoadGetMapParams(): WMS server error. Invalid layer(s) given in the LAYERS
>>> parameter.
>>>> </ServiceException>
>>>> </ServiceExceptionReport>
>>>>
>>>> What can I do, to avoid this behaviour. When there is no object visible, the
>>> getfeatureinfo-request should return no result and must not open the popup.
>>>>
>>>> Greeting RW
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>>
>>
>>
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>
>
>
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> mschulz at webgis.de
>
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>
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Michael Schulz
mschulz at webgis.de

in medias res
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Tel:  +49 (0)761 705798-0
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