How can I specify explicitly on expansion of a particular node by the user

[YanniShin]

Hi,

It expands all the nodes in the tree. How can I specify explicitly on expansion of a particular node by the user, the action should happen.

Please provide some pointers to this problem.

[evant]

myTree.on('expandnode', function(node)
{
   if (node.id == 1)
   {
      //do something special
   }
}
);

[YanniShin]

Thanks for your help!
But I Know,How can I specify explicitly on expansion of a particular node by the user when tree render.

Ext.onReady(function() {
		    // shorthand
		    //Ext.QuickTips.init();
		    var Tree = Ext.tree;

		    var tree = new Tree.TreePanel({
		        el:'treeBox',
		        border : false,
		        autoScroll:true,
		        animate:true,
		        rootVisible:false,
		        enableDD:true,
	          //selModel: new Ext.tree.MultiSelectionModel(),
		        containerScroll: true,
		        loader: new Tree.TreeLoader(),
		        collapseFirst:false
			});

		    // set the root node
		    //var root = new Tree.TreeNode(
		    var root = new Tree.AsyncTreeNode(
		    //{text: 'Tree',allowDrop:false,id:'D10'}
		    <c:out value='${treeNode}' escapeXml='false' />
		    );

		    /*
		    var json = [<c:out value='${treeNode}' escapeXml='false' />];

			for(var i = 0, len = json.length; i < len; i++) {
        		root.appendChild(tree.getLoader().createNode(json[i]));
    		}
    		*/


		    tree.setRootNode(root);

		    tree.render();
		    //tree.expandAll();


		    /*
		    var CallBackHandler = {success: handleExpand};

			function handleExpand() {
				var n = tree.getNodeById("D10");
				alert(n);
				if (n !== undefined) {
					this.tree.getLoader ().load (n);
					n.expand (true, true);
				}
			}
			*/


		    //root.expand(false,false,CallBackHandler);
		    //root.expand(false,false,handleExpand);
			root.expand(false, false, function() {
				root.firstChild.expand(false);
			});

			tree.on('beforenodedrop', doDrop);
		    tree.on('click', doClick);

		    root.on('expandnode', function(node) {
		    	alert(node.id);
   				if (node.id == "DELETE") {
      				alert("1");
   				}
			});

		    Ext.get('expand').on('click', function() {
				tree.expandAll();
			});

			Ext.get('collapse').on('click', function() {
				tree.collapseAll();
			});
		});