[Users] Question on using WMS GetLegendGraphic with a GeoExt.tree.LayerNode

[Andreas Hocevar]

Hi,

the easiest way is to customize your loader with a createNode method. Inside that method, you set the icon attribute to the location (GetLegendGraphic request) of your image.

loader: {
    param: "LAYERS",
    createNode: function(attr) {
        attr.icon = "...&reqest=GetLegendGraphic&layers="+attr.text
        return GeoExt.tree.LayerParamLoader.prototype.createNode.apply(this, arguments);
    }
}

Regards,
Andreas.

On Nov 23, 2010, at 01:38 , Andrew Stewart wrote:

> Sorry to reply so many times to my own post.. but I kinda figured this out. Basically now I am setting the text property of each childnode after expanding to the WMS GetLegendGraphic request and then contatonating that with the text name of the node. Is there a better way to do this.. I am just using the expand event and then redrawing the entire childnodes with new icons.. can I do this before the nodes are even expanded?
> 
> 
> 
> 
> 
> 
> 
> 
> From: users-bounces at geoext.org [users-bounces at geoext.org] On Behalf Of Andrew Stewart [Andrew.Stewart at reddeer.ca]
> Sent: November 22, 2010 4:22 PM
> To: users at geoext.org
> Subject: Re: [Users] Question on using WMS GetLegendGraphic with        a       GeoExt.tree.LayerNode
> 
> So I have tried to change the icon of each childNode after the expand event like so -
> 
> 
> 'expand' : {fn: function(node) {
> var count = (node.childNodes.length -1);
> while (count >= 0)
> {node.childNodes[count].setIcon("../images/minus.png");
> count -=1;
> }
> }}
> 
> But this does not seem to work, anything else I can try?
> 
> 
> 
> ________________________________
> From: users-bounces at geoext.org [mailto:users-bounces at geoext.org] On Behalf Of Andrew Stewart
> Sent: November 22, 2010 3:51 PM
> To: users at geoext.org
> Subject: [Users] Question on using WMS GetLegendGraphic with a GeoExt.tree.LayerNode
> 
> Is it possible to show a legend graphic which is returned from my WMS GetLegendGraphic request next to each item on the LayerNode after it is expanded? (or before.. Or whenever as long as it shows).
> 
> I declare my layernode like so -
> 
> //Trails layerList
>        layerList_Trails = new GeoExt.tree.LayerNode({
>        "layer": layer_Trails,
>        "isLeaf": false,
>        "checked": false,
>        "enableDD": true,
>        "cls": "rootnode",
>        "singleClickExpand": true,
>        "listeners": {
>        'checkchange' :  function(node, checked)
>            {
>            // If a parent node is unchecked, uncheck all the children
>            if (node.getUI().isChecked()) {
>                node.expand();
>            }
>            if (!node.getUI().isChecked())
>            {
>                node.collapse();
>            }
>    }
>  },
>        "loader": {
>            "param": "LAYERS"
>        }
>        });
> 
> Which is added to my root -
> layerRoot_Legend.appendChild(layerList_Trails);
> 
> And then my treepanel
> 
> var layerRoot_Legend = new Ext.tree.TreeNode({
>        enableDD: true,
>        text: "All Legend Items",
>        loaded: true,
>        expanded: true
>        });
> 
>        var layerTree_Legend = new Ext.tree.TreePanel({
>        title: '',
>        root: layerRoot_Legend,
>        enableDD: true,
>        applyLoader: true,
>        rootVisible: false
>        });
> 
> 
> Except previously when I declared my layers individually I had put an <img> tag with the right layer next to each.. But now I am declaring them in groups like -
>         //Trails Group
>         var layer_Trails = new OpenLayers.Layer.WMS("<img src='http://localhost/WebService/Request.aspx?request=GetLegendGraphic&version=1.1.1&format=image/png&layer=Asphalt' alt=''/>Trails", "http://localhost/WebService/Request.aspx",
>                {
>         layers: ['Onstreet_Bike_Route', 'Mountain_-_Stunt_Biking', 'Equestrian', 'Gravel_or_Shale', 'Asphalt'],
>                     VERSION: "1.1.1",
>                     transparent: true
>                    },
>                    { isBaseLayer: false,
>                      singleTile: true,
>                      visibility: false,
>                      buffer: 1,
>                      ratio: 1
>                    }
> But this only puts the image on the actual group name and I need it to be beside each legend entry when it is expanded. Is there a place somewhere I can stick this image tag and either hard code the layer name or have it be returned from the childNodes of the tree and get it to show this image beside each childNode? Appreciate any assistance!
> 
> 
> 
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-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.