[Users] Change Opacity of a layer in a group layer

[Andreas Hocevar]

Ah, and the reason for this is that the layer in your configuration results
in a single image request to the server, so the server stacks the images of
the three layers into one.

Andreas.
On Jun 24, 2012 11:20 AM, "Andreas Hocevar" <ahocevar at opengeo.org> wrote:

> To achieve this, you have to use a style that uses opacity on the server
> side.
>
> Andreas.
> On Jun 21, 2012 7:56 PM, "julia paredes" <japr94 at hotmail.com> wrote:
>
>>  Hi all,
>>
>> If I have a group layer definition such as the following :
>>
>> var Test = new OpenLayers.Layer.WMS(
>>                  "Group Layer", mapserverUrl,
>>                 {
>>                     map: "C:/Users/Administrator/map.map",
>>                     layers: [
>>                         "First",
>>                         "Second",
>>                         "Third"
>>                      ],
>>                     format: "image/png",
>>                     transparent: "true"
>>                 }
>>                 ,
>>                 {
>>                     isBaseLayer: false,
>>                     visibility: false,
>>                     opacity: opa
>>                 }
>>                 );
>>
>> Is there a way I could change the opacity of just one of the layers
>> belonging to the group layer?
>> Before adding a group layer I was using jquery to add a slider and a drop
>> down menu to select a layer to change the opacity.
>> I am not sure if the layer opacity slider provided by GeoExt will make
>> this easier or if there is a way to access a particular layer in the group
>> layer by doing something like Test.layers[0]
>>
>> Any ideas?
>>
>> Thanks in advance
>>
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>>
>>
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