[Users] LegendGraphics in Layer Tree [Sec=Unclassified]

[Miles Jordan]

Thanks Matt,

My layers are loading from a Ext.data.JsonStore so I didn't try 1). I tried 2) but couldn't get it to work the way that you mentioned.

With a little help from comments in the TreeLoader source and http://www.mail-archive.com/users@geoext.org/msg00336.html I got it to work.

In the end the loader for the LayerContainer looks like:

loader: {
        createNode: function(attr) {
                var layer = this.store.getById(attr.layer.id).get('layer');
                var layer_name = layer.params.LAYERS;
                attr.icon = wms + 'REQUEST=GetLegendGraphic&VERSION=1.0.0&FORMAT=image/png&WIDTH=20&HEIGHT=20&LAYER=' + layer_name;
                return GeoExt.tree.LayerLoader.prototype.createNode.call(this, attr);
        }
}

It works, but the way to get the layer name seems ugly - perhaps there is a nicer way. Anyway this will do for now!

Thanks,

Miles


Matt Priour wrote:
> To make the layer nodes themselves each have unique graphic icon, you
> can do
> 2 possible things.
> 1. Don't use an overlay layer container or other such preconfigured
> layer tree loader node type. Instead, use 'nodeType:"layerNode"' and
> give each layer node an 'icon' property (to put the legend graphic url
> directly in the tree configuration) or an 'iconCls' (to do it via CSS
> background images)
>
> 2. Go ahead and use one of the GeoExt layer tree loader node types and
> in the baseAttrs property of the loader, assign a renderer function or
> assign a function to the 'icon' attribute to allow you to calculate
> the icon path automattically
>
> If you just want to include a legend somewhere in the layertree panel,
> then you can use one of the GeoExt legend widgets for that.
>
> Matt Priour
> Kestrel Computer
>
> --------------------------------------------------
> From: "Miles Jordan" <Miles.Jordan at aad.gov.au>
> Sent: Monday, July 05, 2010 7:39 PM
> To: <users at geoext.org>
> Subject: Re: [Users] LegendGraphics in Layer Tree [Sec=Unclassified]
>
>> Miles Jordan wrote:
>>> Hi,
>>>
>>> Is it possible to put an icon representing each layer (legendgraphic)
>>> in the layer tree? I've been searching for a good example to no avail.
>>>
>>
>> I take it by the null response that it's not a straight forward thing
>> in GeoExt to have a layer switcher that also displays a legend. Is that
>> not a fundamental part of web mapping? I'm sure it can't be too hard,
>> but either way, I'd really appreciate it if somebody could let me know!
>> I just don't want to reinvent the wheel.
>>
>> Thanks,
>>
>> Miles
>>


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