[Users] One basic question

[Tim Schaub]

Ozgur Zan wrote:
> Dear List member,
> 
> I have installed Geoserver and using Geo Ext (OpenLayers, Ext Js, GWT) I
> design the interfaces for navigating layers in a map. I appreciate if you
> can help me with the following basic question:
> 
>   - The aim is to display further information about the place where the user
> clicks in the WMS layer. It already works in Geoserver but not in GeoExt. I
> do not know how to fetch (which protocol, format, functions to use) data
> from Geoserver to Geo Ext.
> 

The WMS protocol defines a GetFeatureInfo method.  You can issue a 
GetFeatureInfo to get information about any number of layers based on a 
user's click.  When the response returns, you can display the server 
generated info in a popup (for example).

Relevant example from OpenLayers:
http://openlayers.org/dev/examples/getfeatureinfo-popup.html

The WFS protocol defines a GetFeature method.  You can issue a 
GetFeature request to get feature data based on a click (bounding box or 
other filter in a query).  When the response returns, you can render any 
features or feature attributes on the client.

Relevant example from OpenLayers:
http://openlayers.org/dev/examples/getfeature-wfs.html

The WMSGetFeatureInfo control from OpenLayers can be wrapped in a 
GeoExt.Action if you want to add a button to an Ext toolbar:
http://dev.geoext.org/trunk/geoext/examples/toolbar.html

You can also use a GeoExt.Popup to display content anchored to the map:
http://dev.geoext.org/trunk/geoext/examples/popup.html

Hope that helps point you in the right direction.

Tim

> Thanks for your support in advance.
> Ozgur ZAN
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Users mailing list
> Users at geoext.org
> http://www.geoext.org/cgi-bin/mailman/listinfo/users


-- 
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.