[mapguide-users] Using Mapguide OS with OpenLayers Setting Layer Visibility

[Mike Adair]

Pietro is correct about how to set those 'showLayers' and 'hideLayers' 
params.  You might also want to have a look at Fusion 
(http://trac.osgeo.org/fusion/) which already implements much of the 
framework code to do things like that.

Mike



Pietro Ianniello wrote:
> You must get layers object ids on server side, something like:
>
>            string strLID= mgMap.GetLayers().GetItem("*LAYER 
> NAME*").GetObjectId()
>
> they depend on mapguide session.
>
> the use these object ids as params to OpenLayers'layer params 
> showLayers,hideLayers.
>
> For example
>
> visible laye obj id:  "LVID1"
>
> invisible layers id: "LVID2","LVID3"
>
> OpenLayers layer var: var myLayer;
>
> myLayer.params.showLayers = "LVID1";
> myLauer.params.hideLayers = "LVID2,LVID3"; //comma separated values
> myLauer.redraw(true);
>
>
> Regard,
>
> Pietro Ianniello
>
> On Fri, Feb 26, 2010 at 12:00 PM, durrrr <paul.nicholson at capita.co.uk 
> <mailto:paul.nicholson at capita.co.uk>> wrote:
>
>
>     Hi,
>
>     I am using OpenLayers as my front end to a MapGuide OS map. I have
>     created a
>     map using maestro which consists of 5 different layers and this map is
>     rendered in OpenLayers as 1 image (The Base Layer).
>     I have queried the MGOS API and have brought back a list of all of the
>     layers that make up the base layer, and now i want to be able to
>     switch
>     individual layers off. I have tried this using the SetVisible()
>     method but
>     this doesnt seem to work. In the firebug console it says the layer is
>     visible:false but it still shows on the map... I am using php to
>     query the
>     api and javascript\ajax on the layerswitcher and to refresh the map.
>     If anyone has any suggestions i would appreciate there help.
>
>     Thank You
>
>
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-- 
   Michael Adair
   Senior Software Architect
   DM Solutions Group Inc.

   Office: (613) 565-5056 x26
   madair at dmsolutions.ca
   http://www.dmsolutions.ca
   http://research.dmsolutions.ca