[OpenLayers-Users] Custom LayerSwitcher

[Eric Lemoine]

Diego, we do exactly what you described in MapFish layer tree. Thx

2008/3/11, Diego Guidi <diegoguidi at gmail.com>:
> >  I have one nearyly finished file
> >
> http://www.bnhelp.cz/wwwlibs/hslayers/hsAddons/Control/ExtLayerSwitcher.js
>
> I've modified this code to maintain only a display view with a layers
> management a little bit different.
> Background informations:
> if someone publish different wms layers, foreach layer we need to
> download a separate image or a different group of tiles: if I have one
> WMS and i need to show more layers, it's better to play with WMS
> LAYERS parameter to make a single request and obtain a single image
> that merges all layers requested.
> So I've used your code to introduce, for overlays only, a concept of
> virtual layers:
> all layers that are not baselayers are from a single OpenLayers.WMS
> layer, but when i check/uncheck one or more of virtua layers, actually
> a refresh of the WMS layer is launched, using a new LAYERS string as
> WMS parameter.
> It's not so easy to explain, but the code is more readable that my words ;)
> This is not a real "component" - the code uses some global
> variables... :( - butI hope that this is a basis to start :)
> Thanks to Jachym for the code, and enjoy :)
> Diego
>