[OpenLayers-Users] LayerSwitcher Event

[Richard Greenwood]

Hello All -

I am trying to implement a layer change event as Eric Lemoine
describes below. At the end of my page initialization function I have
placed the code:

map.on({
   "changelayer": function(e) {
       if(e.property === "visibility") {
           alert("visibility changed (" + e.layer.name + ")");
       }
   }
});

But when the page is loaded I get the error:
  map.on is not a function

Am I not registering the event correctly, or can someone see what I am
doing worng?

Thanks,
Rich


On Thu, Jun 10, 2010 at 4:57 AM, Eric Lemoine
<eric.lemoine at camptocamp.com> wrote:
> On Thu, Jun 10, 2010 at 11:59 AM, Rahn Hanno (rahn) <rahn at 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.lemoine at camptocamp.com
> http://www.camptocamp.com
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>



-- 
Richard Greenwood
richard.greenwood at gmail.com
www.greenwoodmap.com