[Users] Help with layer tree and radio buttons

[Dan Ramage]

Andreas,

Thanks for the response. A followup question if you don't mind.
If I have multiple groupings of layers, say a group called Radar and a group
called Underwater Hazards, would each have an entry of
nodeType: "gx_overlaylayercontainer",
expanded: true,
loader: {
  baseAttrs: {radioGroup: "foo"}
 }
? That most likely is not the right method, but I am not sure how you
associate certain layers to a specific group.



Thanks again,

Dan

-----Original Message-----
From: Andreas Hocevar [mailto:ahocevar at opengeo.org] 
Sent: Tuesday, October 27, 2009 1:44 PM
To: Dan Ramage
Cc: users at geoext.org
Subject: Re: [Users] Help with layer tree and radio buttons

Hi,

Dan Ramage wrote:
>
> I'd like to implement a layer tree that makes use of the check box to 
> turn on the layer and the radio button to allow the layer to be queried.
>
> I've been looking over the 
> http://dev.geoext.org/trunk/geoext/examples/tree.js example, however I 
> am just not following how it works at all.
>
> I understand that the JSON is used to configure the layer tree, 
> however I do not understand how most of the nodes get added.
>
> For instance, in the treeConfig variable, the first entry is: nodeType:
"gx_baselayercontainer" and from the documentation I see that 
> gx_baselayercontainer will place all the base layer layers in that node. 
>  
> The second entry of: 
> nodeType: "gx_overlaylayercontainer",
> expanded: true,
> loader: {
>   baseAttrs: {radioGroup: "foo"}
>  }
> is where I cannot follow. I don't see how that relates to the layers that
end up in the "Overlays" node.
> Can someone explain how this works? I might be missing something
fundamental, but I am lost at the moment.

This works exactly like the gx_baselayercontainer, but for the overlays. 
The loader configuration (loader: {baseAttrs...) tells the loader to add 
a radio button with the radio group "foo" to all overlay layer nodes.

Regards,
Andreas.

-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.