With GeoServer you have two options - an image with an error message in it,
or an XML description of the same error message. The usual approach to
avoiding erroneous layer names is to provide the user with a layer chooser
widget rather than spelling out the name himself. GeoExt has some widgets
that might be of use to you if you want to go that way.
There is also the possibility of using CSS to make the failed tiles fully
transparent - see this thread on the OpenLayers mailing list:
http://www.mail-archive.com/[email protected]/msg01229.html
--
David Winslow
OpenGeo - http://opengeo.org/
On Tue, Jan 11, 2011 at 10:58 AM, Manos Karpathiotakis <[email protected]> wrote:
> Hi all!
>
>
> I am using geoserver to expose numerous WMS layers in an application I am
> building with the use of GWT + gwt-openlayers.
>
> At some point, the user provides the name of a layer that he wants to see
> on the map. However, in some cases (as one would normally predict), the name
> he provides does not match with an existing layer.
> At this moment, if I try to visualize a non-existing layer, the map is
> simply filled with a semi-transparent white rectangle. Is there a way to
> make geoserver completely ignore this (invalid) request of mine and just do
> nothing?
>
>
>
> Thanks a lot
>
> Manos
>
>
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