[Users] opacity slider in a bbar - trouble connecting to selected layer

[Eoin Mac Aoidh]

Thankyou Andreas and Bart.
Bart, I looked at http://trac.geoext.org/ticket/301 and updated layerOpacitySlider.js accordingly.
Thanks to your efforts, given the patch, I would expect to be able to call

slider.setLayer(node.layer);

to attach the layer to the slider, but nothing happens. 
My code is:

var slider = new GeoExt.LayerOpacitySlider({ renderTo: document.body, width: 200,value: 100});  

....then within the TreePanel:

bbar: [{
            text: "Remove layer from Map",
            handler: function() {
                var node = tree.getSelectionModel().getSelectedNode();
                if(node) {
                    map.removeLayer(node.layer);   
                }
            }
        },{
            text: "Attach slider to selected layer",
            handler: function() {
                var node2 = tree.getSelectionModel().getSelectedNode();
                if(node2) {
                slider.setLayer(node2.layer);
                }
            }
        }]




Right, that's why I wanted to implement:

http://trac.geoext.org/ticket/301

to make it easier to attach a layer to the opacity slider on the fly.

Best regards,
Bart

> Hi,
>
> On Jul 27, 2010, at 10:51 , Eoin Mac Aoidh wrote:
>
>> Hi list,
>> I have a tree containing the layers in my map. It has a bbar with a
>> button to remove a selected layer from the map. Following this template,
>> I am trying to also add in an opacity slider for the selected layer in
>> the bbar: So that you can either remove a selected layer, or change its
>> opacity.
>> I am having trouble connecting the slider to the selected layer.
>> I suspect at least some of the
 problem is with the line:
>> "layer: tree.getSelectionModel().getSelectedNode().layer"
>
> The whole problem lies here. At the time you construct the tree, there is
> no selected layer yet. You should construct your OpacitySlider in a
> listener to the tree's click event. In this listener, you also have to
> remove an existing slider if there is one already.
>
> Regards,
> Andreas.
>
>
>> I would appreciate any help regarding how to connect the selected layer
>> with the slider.
>> Many Thanks,
>> Eoin
>>
>> The following is the code I have:
>>
>> var tree = new Ext.tree.TreePanel({
>>         region: "center",    //NBNBNBNB centER
>>         title: "Map Layers",
>>         width:
 200,
>>         autoScroll: true,
>>         enableDD: true,
>>         lines: false,
>>         rootVisible: false,
>>         root: new GeoExt.tree.LayerContainer({
>>             layerStore: mapPanel.layers,
>>             expanded: true
>>         }),
>>         bbar: [{
>>             text: "Remove from Map",
>>             handler: function() {
>>                 var node =
 tree.getSelectionModel().getSelectedNode();
>>                 if(node) {
>>                     map.removeLayer(node.layer);
>>                 }
>>             }
>>         },{
>>             xtype: "gx_opacityslider",
>>             layer: tree.getSelectionModel().getSelectedNode().layer,
>>             aggressive: true,
>>             horizontal: true,
>>             width: 120,
>>         
    plugins: new GeoExt.LayerOpacitySliderTip()
>>         }
>>          ]
>>       });
>>


      
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