On Thu, Jun 10, 2010 at 11:59 AM, Rahn Hanno (rahn) <r...@zhaw.ch> wrote:
>
> Hello,
>
> Today I try to realise a "trigger" for my LayerSwitcher. Something like
> "onLayerClick" or so.
>
> I want to start a function if I select/unselect a layer in the
> Layerswitcher. In my Layerswitcher I have a Layer. If I select this Layer,
> then I want to set the opacity from all other layers to 50%. If I unselect
> the Layer the opacity should change again to not transparent.
>
> I think I need a trigger function for that layer. If I select some Layer I
> would fire a function. I think it would be possible, but I don't know how to
> realise.
>
> Perhaps somebody can help me. Or is there something like this already in
> OpenLayers what I have not found?
Two options:
- register a "changelayer" listener on the map
map.on({
"changelayer": function(e) {
if(e.property === "visibility") {
alert("visibility changed (" + e.layer.name + ")");
}
}
});
- register a "visibilitychanged" listener on a specific layer
layer.on({
"visibilitychanged": function() {
alert"visibility changed (" + layer.name + ")");
}
});
Hope it helps,
--
Eric Lemoine
Camptocamp France SAS
Savoie Technolac, BP 352
73377 Le Bourget du Lac, Cedex
Tel : 00 33 4 79 44 44 96
Mail : eric.lemo...@camptocamp.com
http://www.camptocamp.com
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