[OpenLayers-Users] TURN On layers Individually...

[Paul james]

Thats It!

Thanks Andreas!

On Wed, Jul 1, 2009 at 6:11 PM, Andreas Hocevar <ahocevar at opengeo.org>wrote:

> Hi,
>
> On Wed, Jul 1, 2009 at 9:08 PM, Paul james<pauljame at gmail.com> wrote:
> > I have that layer on Openlayers :
> >
> >       var _layer = new OpenLayers.Layer.MapServer(
> >        "PointLayer",
> >        _cgi,
> >        {
> >            map: _mapfile,
> >            singleTile: true,
> >             layers: ['Layer1', 'Layer2', 'Layer3'],
> >            transparent: "true",
> >            format: "image/png"
> >        },
> >     );
> >
> > If I use setVisibility on PointLayer, Layer1, 2 and 3 are turned ON...
> > How Can I turn on/off Layer1,Layer2,Layer3 individually on javascript?
>
> Many ways to do that, no big deal. How 'bout
>
> var _layer = new OpenLayers.Layer.WMS(
>     "PointLayer",
>    _cgi,
>    {
>        map: _mapfile,
>        singleTile: true,
>        layers: ['Layer1', 'Layer2', 'Layer3'],
>        transparent: true,
>         format: 'image/png',
>        initialize: function(name, url, params, options) {
>            this.layerMap = {};
>            var layer;
>            for(var i=0; i<params.layers.length; ++i) {
>                layer = params.layers[i];
>                this.layerMap[layer] = true;
>            }
>            OpenLayers.Layer.WMS.prototype.initialize.apply(this,
> arguments);
>        },
>        setLayerVisibility: function(layer, visibility) {
>            this.layerMap[layer] = visibility;
>            var layers = [];
>            for(var l in this.layerMap) {
>                this.layerMap[l] && layers.push(l);
>            }
>            this.mergeNewParams({"LAYERS": layers});
>        }
>    }
> );
>
> Now you can e.g. use _layer.setLayerVisibility('Layer1', false) to
> turn off Layer1. This would probably also work with Layer.MapServer,
> but I have never used that, and MapServer supports Layer.WMS as well.
>
> Regards,
> Andreas.
>
> >
> > Paul
> >
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> >
> >
>
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/openlayers-users/attachments/20090701/4eee0dda/attachment.html