[Geoprisma-dev] QueryOnClick waits endlessly on a non responding queryable layer

[Yves Moisan]

Le mercredi 06 janvier 2010 à 12:10 -0500, Alexandre Dube a écrit :
> Do you have a link showing the problem ?  It seems that 'errors' 
> returned by servers are already managed by the QueryOnClick widget.  I'd 
> like to know when/how it can endlessly fail...

Well, at one point the "forages queryable" layer on sample1 failed with
that but it doesn't seem to do that anymore.  Here's the result of a few
mapfile tweakings that cast some light on the issue :

Commenting out DUMP TRUE (so DUMP FALSE) produces a well formed but
empty msGMLOutput :

<?xml version="1.0" encoding="ISO-8859-1"?>

<msGMLOutput 
	 xmlns:gml="http://www.opengis.net/gml"
	 xmlns:xlink="http://www.w3.org/1999/xlink"
	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
</msGMLOutput>

That is handled well by GeoPrisma.

Commenting out BOTH DUMP TRUE and TEMPLATE void produces an exception :

<?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?>
<!DOCTYPE ServiceExceptionReport SYSTEM
"http://www.digitalearth.gov/wmt/xml/exception_1_0_1.dtd">
<ServiceExceptionReport version="1.0.1">
<ServiceException code="LayerNotQueryable">
msWMSFeatureInfo(): WMS server error. Requested layer(s) are not
queryable.
</ServiceException>
</ServiceExceptionReport>

which also behaves well in GeoPrisma.

Now, having a layer probably misconfigured (mapfile ??) brings about a
*malformed* xml document which OpenLayers (then GP) crashes on :

<?xml version="1.0" encoding="ISO-8859-1"?>

<msGMLOutput 
	 xmlns:gml="http://www.opengis.net/gml"
	 xmlns:xlink="http://www.w3.org/1999/xlink"
	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<stations_layer>

Most probably, something isn't configured properly in my mapfile layer.
It looks as though MS is looking for something in <stations_layer> and
gets stranded there.  I wonder how a malformed XML can be produced.  Is
it a MapServer bug that should return an error ?  I'll do some more
research, but I need a couple more MapFile debugging tricks ...

Yves

> 
> My guess is that there must be a javascript error occuring, preventing 
> the wait panel to disappear...  A "quick" fix would be to set a timer to 
> 30 seconds and at least hide the wait panel and show a "query too long" 
> message...
> 
> Regards,
> 
> Alexandre
> 
> Yves Moisan wrote:
> > Hi all,
> >
> > Anyone knows of a quick fix for that :
> > http://trac.osgeo.org/geoprisma/ticket/24 ?
> >
> > Cheers,
> >
> > Yves
> >
> > _______________________________________________
> > Geoprisma-dev mailing list
> > Geoprisma-dev at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/geoprisma-dev
> >   
> 
>