# Yahoo! UI Library

### TreeView Widget 2.8.1

Yahoo! UI Library > treeview > TextNode.js (source view)
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    (function () {
        var Dom = YAHOO.util.Dom,
            Lang = YAHOO.lang,
            Event = YAHOO.util.Event;
    /**
     * The default node presentation.  The first parameter should be
     * either a string that will be used as the node's label, or an object
     * that has at least a string property called label.  By default,  clicking the
     * label will toggle the expanded/collapsed state of the node.  By
     * setting the href property of the instance, this behavior can be
     * changed so that the label will go to the specified href.
     * @namespace YAHOO.widget
     * @class TextNode
     * @extends YAHOO.widget.Node
     * @constructor
     * @param oData {object} a string or object containing the data that will
     * be used to render this node.
     * Providing a string is the same as providing an object with a single property named label.
     * All values in the oData will be used to set equally named properties in the node
     * as long as the node does have such properties, they are not undefined, private or functions.
     * All attributes are made available in noderef.data, which
     * can be used to store custom attributes.  TreeView.getNode(s)ByProperty
     * can be used to retrieve a node by one of the attributes.
     * @param oParent {YAHOO.widget.Node} this node's parent node
     * @param expanded {boolean} the initial expanded/collapsed state (deprecated; use oData.expanded)
     */
    YAHOO.widget.TextNode = function(oData, oParent, expanded) {

        if (oData) {
            if (Lang.isString(oData)) {
                oData = { label: oData };
            }
            this.init(oData, oParent, expanded);
            this.setUpLabel(oData);
        }

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

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

        /**
         * The CSS class for the label href.  Defaults to ygtvlabel, but can be
         * overridden to provide a custom presentation for a specific node.
         * @property labelStyle
         * @type string
         */
        labelStyle: "ygtvlabel",

        /**
         * The derived element id of the label for this node
         * @property labelElId
         * @type string
         */
        labelElId: null,

        /**
         * The text for the label.  It is assumed that the oData parameter will
         * either be a string that will be used as the label, or an object that
         * has a property called "label" that we will use.
         * @property label
         * @type string
         */
        label: null,

        /**
         * The text for the title (tooltip) for the label element
         * @property title
         * @type string
         */
        title: null,

        /**
         * The href for the node's label.  If one is not specified, the href will
         * be set so that it toggles the node.
         * @property href
         * @type string
         */
        href: null,

        /**
         * The label href target, defaults to current window
         * @property target
         * @type string
         */
        target: "_self",

        /**
         * The node type
         * @property _type
         * @private
         * @type string
         * @default "TextNode"
         */
        _type: "TextNode",

        /**
         * Sets up the node label
         * @method setUpLabel
         * @param oData string containing the label, or an object with a label property
         */
        setUpLabel: function(oData) {

            if (Lang.isString(oData)) {
                oData = {
                    label: oData
                };
            } else {
                if (oData.style) {
                    this.labelStyle = oData.style;
                }
            }

            this.label = oData.label;

            this.labelElId = "ygtvlabelel" + this.index;

        },

        /**
         * Returns the label element
         * @for YAHOO.widget.TextNode
         * @method getLabelEl
         * @return {object} the element
         */
        getLabelEl: function() {
            return Dom.get(this.labelElId);
        },

        // overrides YAHOO.widget.Node
        getContentHtml: function() {
            var sb = [];
            sb[sb.length] = this.href?'<a':'<span';
            sb[sb.length] = ' id="' + this.labelElId + '"';
            sb[sb.length] = ' class="' + this.labelStyle  + '"';
            if (this.href) {
                sb[sb.length] = ' href="' + this.href + '"';
                sb[sb.length] = ' target="' + this.target + '"';
            }
            if (this.title) {
                sb[sb.length] = ' title="' + this.title + '"';
            }
            sb[sb.length] = ' >';
            sb[sb.length] = this.label;
            sb[sb.length] = this.href?'</a>':'</span>';
            return sb.join("");
        },

      /**
         * Returns an object which could be used to build a tree out of this node and its children.
         * It can be passed to the tree constructor to reproduce this node as a tree.
         * It will return false if the node or any descendant loads dynamically, regardless of whether it is loaded or not.
         * @method getNodeDefinition
         * @return {Object | false}  definition of the tree or false if this node or any descendant is defined as dynamic
         */
        getNodeDefinition: function() {
            var def = YAHOO.widget.TextNode.superclass.getNodeDefinition.call(this);
            if (def === false) { return false; }

            // Node specific properties
            def.label = this.label;
            if (this.labelStyle != 'ygtvlabel') { def.style = this.labelStyle; }
            if (this.title) { def.title = this.title; }
            if (this.href) { def.href = this.href; }
            if (this.target != '_self') { def.target = this.target; }

            return def;

        },

        toString: function() {
            return YAHOO.widget.TextNode.superclass.toString.call(this) + ": " + this.label;
        },

        // deprecated
        onLabelClick: function() {
            return false;
        },
        refresh: function() {
            YAHOO.widget.TextNode.superclass.refresh.call(this);
            var label = this.getLabelEl();
            label.innerHTML = this.label;
            if (label.tagName.toUpperCase() == 'A') {
                label.href = this.href;
                label.target = this.target;
            }
        }

    });
    })();

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