Dear Subha
I would set up two states layers in Mapserver. One is a generic one that
responds to GetFeatureInfo requests from OpenLayers. The second one has a
FILTER section. On the click handler in OpenLayers, once you click on a state
and get it's name via a GetFeatureInfo request, then load the second States
layer by passing the name of the state to mapserver with variable substitution.
I do something similar with Roads. My second layer would be defined something
like the following:
LAYER
NAME crs_roads
GROUP "CRS"
TYPE LINE
STATUS ON
DATA ../data/nztm/crs/roads_1207
FILTERITEM 'NAME'
FILTER '%road%'
In OpenLayers I would send the WMS request like:
selrd = new OpenLayers.Layer.WMS( "Selected Road",
"http://10.65.192.1/cgi-bin/gsswms.exe?road="+rdname (
'http://10.65.192.1/cgi-bin/gsswms.exe?road="+rdname' )+"&",
{layers: ['crs_roads'], transparent: 'true', format:
"image/png"},
{singleTile: true, isBaseLayer: false, maxResolution:
500000, visibility: true} );
map.addLayer(selrd);
where rdname is variable holding the road name (in your case State name)
retrieved from the click event.
Kind regards,
Robert Sanson
>>> Subha Ramakrishnan <[EMAIL PROTECTED]> 29/09/2008 5:14 p.m. >>>
Hi,
I am using openlayers and mapserver to overlay an image of the states of
india on google map.
Is there a way to color/highlight a state on clicking, using mapserver?
I am not using any mapscript. So are there any settings to be done in
map file which will enable this? And how do i send a request from
openlayers to get the image from mapserver?
Expecting a reply.
Thanks.
Subha
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