# Yahoo! UI Library

### TreeView Widget

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

    /**
     * A menu-specific implementation that differs from TextNode in that only
     * one sibling can be expanded at a time.
     * @namespace YAHOO.widget
     * @class MenuNode
     * @extends YAHOO.widget.TextNode
     * @param oData {object} a string or object containing the data that will
     * be used to render this node
     * @param oParent {YAHOO.widget.Node} this node's parent node
     * @param expanded {boolean} the initial expanded/collapsed state
     * @constructor
     */
    YAHOO.widget.MenuNode = function(oData, oParent, expanded) {
    	if (oData) {
    		this.init(oData, oParent, expanded);
    		this.setUpLabel(oData);
    	}

        /*
         * Menus usually allow only one branch to be open at a time.
         */
    	this.multiExpand = false;

        this.logger     = new YAHOO.widget.LogWriter(this.toString());

    };

    YAHOO.extend(YAHOO.widget.MenuNode, YAHOO.widget.TextNode, {

        toString: function() {
            return "MenuNode (" + this.index + ") " + this.label;
        }

    });

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