# Yahoo! UI Library

### TreeView Widget 2.5.1

Yahoo! UI Library > treeview > RootNode.js (source view)

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    /**
     * A custom YAHOO.widget.Node that handles the unique nature of
     * the virtual, presentationless root node.
     * @namespace YAHOO.widget
     * @class RootNode
     * @extends YAHOO.widget.Node
     * @param oTree {YAHOO.widget.TreeView} The tree instance this node belongs to
     * @constructor
     */
    YAHOO.widget.RootNode = function(oTree) {
    	// Initialize the node with null params.  The root node is a
    	// special case where the node has no presentation.  So we have
    	// to alter the standard properties a bit.
    	this.init(null, null, true);

    	/*
    	 * For the root node, we get the tree reference from as a param
    	 * to the constructor instead of from the parent element.
    	 */
    	this.tree = oTree;
    };

    YAHOO.extend(YAHOO.widget.RootNode, YAHOO.widget.Node, {

        // overrides YAHOO.widget.Node
        getNodeHtml: function() {
            return "";
        },

        toString: function() {
            return "RootNode";
        },

        loadComplete: function() {
            this.tree.draw();
        },

        collapse: function() {},
        expand: function() {}

    });

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