How to load images in TreePanel in Ext JS

While creating an Ext.TreePanel, I wanted to include an image in the node along with the text containing the URL to the image. However, I encountered an issue where the image was not loading on the page, only the text was visible. Is there a way to display the image?

Here is the code snippet:

var root1 = new Tree.AsyncTreeNode({
    text: 'Legenda degli starti PAT',
    draggable:true, // disable root node dragging
    id:'source'
});

var tree1 = new Tree.TreePanel({
    renderTo : 'legend',
    animate:true, 
    loader: new Tree.TreeLoader({dataUrl:'legend.php'}),
    containerScroll: true,
    root: root1,
});

Below is the response from the TreePanel request:

[{"text":"comuni","id":"co","leaf":false,"cls":"folder","children":[{"text":"http:\/\/localhost\
/cgi-bin\/mapserv?map=\/home\/gis\/mapserver\/cartocomune_wms.map&SERVICE=wms&FORMAT=png&VERSION=1.1
.1&LAYER=comuni&REQUEST=GetLegendGraphic","id":"comuni","leaf":true,"cls":"file"}]},{"text":"idrografia"
,"id":"id","leaf":false,"cls":"folder","children":[{"text":"http:\/\/localhost\/cgi-bin\/mapserv
?map=\/home\/gis\/mapserver\/cartocomune_wms.map&SERVICE=wms&FORMAT=png&VERSION=1.1.1&LAYER=idrografia
&REQUEST=GetLegendGraphic","id":"idrografia","leaf":true,"cls":"file"}]},{"text":"viabilita","id":"via"
,"leaf":false,"cls":"folder","children":[{"text":"http:\/\/localhost\/cgi-bin\/mapserv?map=\/home
\/gis\/mapserver\/cartocomune_wms.map&SERVICE=wms&FORMAT=png&VERSION=1.1.1&LAYER=viabilita&REQUEST=GetLegendGraphic"
,"id":"viabilita","leaf":true,"cls":"file"}]},{"text":"uso_suolo","id":"uso","leaf":false,"cls":"folder"
,"children":[{"text":"http:\/\/localhost\/cgi-bin\/mapserv?map=\/home\/gis\/mapserver\/cartocomune_wms
.map&SERVICE=wms&FORMAT=png&VERSION=1.1.1&LAYER=uso_suolo&REQUEST=GetLegendGraphic","id":"uso_suolo"
,"leaf":true,"cls":"file"}]},{"text":"catasto","id":"cat","leaf":false,"cls":"folder","children":[{"text"
:"http:\/\/localhost\/cgi-bin\/mapserv?map=\/home\/gis\/mapserver\/cartocomune_wms.map&SERVICE=wms
&FORMAT=png&VERSION=1.1.1&LAYER=catasto&REQUEST=GetLegendGraphic","id":"catasto","leaf":true,"cls":"file"
}]}]

Thank you, Luca

javascriptimageextjstreepanel

Answer №1

Make sure to add an "iconCls" attribute to each node in your JSON data that points to a CSS class defining the image you want to display for that specific node.

According to the extjs.com API documentation:

// include the iconCls property in the class configuration: ... iconCls: 'my-icon'

// define a CSS class with the background image for the icon: .my-icon { background-image: url(../images/my-icon.gif) 0 6px no-repeat !important; }

Your JSON structure should follow this format:

[{"text":"comuni","id":"co","leaf":false,"cls":"folder","children":[{"text":"http://localhost\ /cgi-bin/mapserv?map=/home/gis/mapserver/cartocomune_wms.map&SERVICE=wms&FORMAT=png&VERSION=1.1 .1&LAYER=comuni&REQUEST=GetLegendGraphic","id":"comuni","leaf":true,"cls":"file", "iconCls": "my-icon"}]},{"text":"idrografia" ,"id":"id","leaf":false,"cls":"folder", "iconCls": "my-icon"} ... etc.. etc...}]

Answer №2

It appears that the issue at hand is not entirely clear - are you noticing placeholders where images should be? If so, it would be wise to verify that Ext.BLANK_IMAGE_URL is configured correctly. If you are attempting to load custom images, analyze the tree nodes in Firebug to ensure that the image tags are being rendered accurately with the correct URLs. Additionally, review the Net tab in Firebug to identify any broken image references.

Answer №3

Make sure your Ext.BLANK_IMAGE_URL is pointing correctly to the s.gif file

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