treeview.js

这是YUI的源码及相关示例。里面有很多很炫的Javascript效果。

        if (node.expanded) {
            // wait until the animation is complete before deleting to
            // avoid javascript errors
            if (this._collapseAnim) {
                this.subscribe("animComplete", 
                        this._removeChildren_animComplete, this, true);
                Widget.Node.prototype.collapse.call(node);
                return;
            }

            node.collapse();
        }

        while (node.children.length) {
            this._deleteNode(node.children[0]);
        }

        if (node.isRoot()) {
            Widget.Node.prototype.expand.call(node);
        }

        node.childrenRendered = false;
        node.dynamicLoadComplete = false;

        node.updateIcon();
    },

    /**
     * Deletes the node and recurses children
     * @method _deleteNode
     * @private
     */
    _deleteNode: function(node) { 
        // Remove all the child nodes first
        this.removeChildren(node);

        // Remove the node from the tree
        this.popNode(node);
    },

    /**
     * Removes the node from the tree, preserving the child collection 
     * to make it possible to insert the branch into another part of the 
     * tree, or another tree.
     * @method popNode
     * @param {Node} the node to remove
     */
    popNode: function(node) { 
        var p = node.parent;

        // Update the parent's collection of children
        var a = [];

        for (var i=0, len=p.children.length;i<len;++i) {
            if (p.children[i] != node) {
                a[a.length] = p.children[i];
            }
        }

        p.children = a;

        // reset the childrenRendered flag for the parent
        p.childrenRendered = false;

         // Update the sibling relationship
        if (node.previousSibling) {
            node.previousSibling.nextSibling = node.nextSibling;
        }

        if (node.nextSibling) {
            node.nextSibling.previousSibling = node.previousSibling;
        }

        node.parent = null;
        node.previousSibling = null;
        node.nextSibling = null;
        node.tree = null;

        // Update the tree's node collection 
        delete this._nodes[node.index];
    },

	/**
	* Nulls out the entire TreeView instance and related objects, removes attached
	* event listeners, and clears out DOM elements inside the container. After
	* calling this method, the instance reference should be expliclitly nulled by
	* implementer, as in myDataTable = null. Use with caution!
	*
	* @method destroy
	*/
	destroy : function() {
		// Since the label editor can be separated from the main TreeView control
		// the destroy method for it might not be there.
		if (this._destroyEditor) { this._destroyEditor(); }
		var el = this.getEl();
		Event.removeListener(el,'click');
		Event.removeListener(el,'dblclick');
		Event.removeListener(el,'mouseover');
		Event.removeListener(el,'mouseout');
		Event.removeListener(el,'keydown');
		for (var i = 0 ; i < this._nodes.length; i++) {
			var node = this._nodes[i];
			if (node && node.destroy) {node.destroy(); }
		}
		el.parentNode.removeChild(el);
		this._hasEvents = false;
	},
		
			


    /**
     * TreeView instance toString
     * @method toString
     * @return {string} string representation of the tree
     */
    toString: function() {
        return "TreeView " + this.id;
    },

    /**
     * Count of nodes in tree
     * @method getNodeCount
     * @return {int} number of nodes in the tree
     */
    getNodeCount: function() {
        return this.getRoot().getNodeCount();
    },

    /**
     * Returns an object which could be used to rebuild the tree.
     * It can be passed to the tree constructor to reproduce the same tree.
     * It will return false if any node loads dynamically, regardless of whether it is loaded or not.
     * @method getTreeDefinition
     * @return {Object | false}  definition of the tree or false if any node is defined as dynamic
     */
    getTreeDefinition: function() {
        return this.getRoot().getNodeDefinition();
    },

    /**
     * Abstract method that is executed when a node is expanded
     * @method onExpand
     * @param node {Node} the node that was expanded
     * @deprecated use treeobj.subscribe("expand") instead
     */
    onExpand: function(node) { },

    /**
     * Abstract method that is executed when a node is collapsed.
     * @method onCollapse
     * @param node {Node} the node that was collapsed.
     * @deprecated use treeobj.subscribe("collapse") instead
     */
    onCollapse: function(node) { }

};

/* Backwards compatibility aliases */
var PROT = TV.prototype;
 /**
     * Renders the tree boilerplate and visible nodes.
     *  Alias for render
     * @method draw
     * @deprecated Use render instead
     */
PROT.draw = PROT.render;

/* end backwards compatibility aliases */

YAHOO.augment(TV, YAHOO.util.EventProvider);

/**
 * Running count of all nodes created in all trees.  This is 
 * used to provide unique identifies for all nodes.  Deleting
 * nodes does not change the nodeCount.
 * @property YAHOO.widget.TreeView.nodeCount
 * @type int
 * @static
 */
TV.nodeCount = 0;

/**
 * Global cache of tree instances
 * @property YAHOO.widget.TreeView.trees
 * @type Array
 * @static
 * @private
 */
TV.trees = [];

/**
 * Global method for getting a tree by its id.  Used in the generated
 * tree html.
 * @method YAHOO.widget.TreeView.getTree
 * @param treeId {String} the id of the tree instance
 * @return {TreeView} the tree instance requested, null if not found.
 * @static
 */
TV.getTree = function(treeId) {
    var t = TV.trees[treeId];
    return (t) ? t : null;
};


/**
 * Global method for getting a node by its id.  Used in the generated
 * tree html.
 * @method YAHOO.widget.TreeView.getNode
 * @param treeId {String} the id of the tree instance
 * @param nodeIndex {String} the index of the node to return
 * @return {Node} the node instance requested, null if not found
 * @static
 */
TV.getNode = function(treeId, nodeIndex) {
    var t = TV.getTree(treeId);
    return (t) ? t.getNodeByIndex(nodeIndex) : null;
};


/**
     * Class name assigned to elements that have the focus
     *
     * @property TreeView.FOCUS_CLASS_NAME
     * @type String
     * @static
     * @final
     * @default "ygtvfocus"

	*/ 
TV.FOCUS_CLASS_NAME = 'ygtvfocus';

/**
 * Attempts to preload the images defined in the styles used to draw the tree by
 * rendering off-screen elements that use the styles.
 * @method YAHOO.widget.TreeView.preload
 * @param {string} prefix the prefix to use to generate the names of the
 * images to preload, default is ygtv
 * @static
 */
TV.preload = function(e, prefix) {
    prefix = prefix || "ygtv";


    var styles = ["tn","tm","tmh","tp","tph","ln","lm","lmh","lp","lph","loading"];
    // var styles = ["tp"];

    var sb = [];
    
    // save the first one for the outer container
    for (var i=1; i < styles.length; i=i+1) { 
        sb[sb.length] = '<span class="' + prefix + styles[i] + '">&#160;</span>';
    }

    var f = document.createElement("div");
    var s = f.style;
    s.className = prefix + styles[0];
    s.position = "absolute";
    s.height = "1px";
    s.width = "1px";
    s.top = "-1000px";
    s.left = "-1000px";
    f.innerHTML = sb.join("");

    document.body.appendChild(f);

    Event.removeListener(window, "load", TV.preload);

};

Event.addListener(window,"load", TV.preload);
})();
(function () {
	var Dom = YAHOO.util.Dom,
		Lang = YAHOO.lang,
		Event = YAHOO.util.Event;
/**
 * The base class for all tree nodes.  The node's presentation and behavior in
 * response to mouse events is handled in Node subclasses.
 * @namespace YAHOO.widget
 * @class Node
 * @uses YAHOO.util.EventProvider
 * @param oData {object} a string or object containing the data that will
 * be used to render this node, and any custom attributes that should be
 * stored with the node (which is available in noderef.data).
 * All values in 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.
 * @param oParent {Node} this node's parent node
 * @param expanded {boolean} the initial expanded/collapsed state (deprecated, use oData.expanded)
 * @constructor
 */
YAHOO.widget.Node = function(oData, oParent, expanded) {
    if (oData) { this.init(oData, oParent, expanded); }
};

YAHOO.widget.Node.prototype = {

    /**
     * The index for this instance obtained from global counter in YAHOO.widget.TreeView.
     * @property index
     * @type int
     */
    index: 0,

    /**
     * This node's child node collection.
     * @property children
     * @type Node[] 
     */
    children: null,

    /**
     * Tree instance this node is part of
     * @property tree
     * @type TreeView
     */
    tree: null,

    /**
     * The data linked to this node.  This can be any object or primitive
     * value, and the data can be used in getNodeHtml().
     * @property data
     * @type object
     */
    data: null,

    /**
     * Parent node
     * @property parent
     * @type Node
     */
    parent: null,

    /**
     * The depth of this node.  We start at -1 for the root node.
     * @property depth
     * @type int
     */
    depth: -1,

    /**
     * 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's expanded/collapsed state
     * @property expanded
     * @type boolean
     */
    expanded: false,

    /**
     * Can multiple children be expanded at once?
     * @property multiExpand
     * @type boolean
     */
    multiExpand: true,

    /**
     * Should we render children for a collapsed node?  It is possible that the
     * implementer will want to render the hidden data...  @todo verify that we 
     * need this, and implement it if we do.
     * @property renderHidden
     * @type boolean
     */
    renderHidden: false,

    /**
     * This flag is set to true when the html is generated for this node's
     * children, and set to false when new children are added.
     * @property childrenRendered
     * @type boolean
     */
    childrenRendered: false,

    /**
     * Dynamically loaded nodes only fetch the data the first time they are
     * expanded.  This flag is set to true once the data has been fetched.
     * @property dynamicLoadComplete
     * @type boolean
     */
    dynamicLoadComplete: false,

    /**
     * This node's previous sibling
     * @property previousSibling
     * @type Node
     */
    previousSibling: null,

    /**
     * This node's next sibling
     * @property nextSibling
     * @type Node
     */
    nextSibling: null,

    /**
     * We can set the node up to call an external method to get the child
     * data dynamically.
     * @property _dynLoad
     * @type boolean
     * @private
     */
    _dynLoad: false,

    /**
     * Function to execute when we need to get this node's child data.
     * @property dataLoader
     * @type function
     */
    dataLoader: null,

    /**
     * This is true for dynamically loading nodes while waiting for the
     * callback to return.
     * @property isLoading
     * @type boolean
     */
    isLoading: false,

    /**
     * The toggle/branch icon will not show if this is set to false.  This
     * could be useful if the implementer wants to have the child contain
     * extra info about the parent, rather than an actual node.
     * @property hasIcon
     * @type boolean
     */
    hasIcon: true,

    /**
     * Used to configure what happens when a dynamic load node is expanded
     * and we discover that it does not have children.  By default, it is
     * treated as if it still could have children (plus/minus icon).  Set
     * iconMode to have it display like a leaf node instead.
     * @property iconMode
     * @type int
     */
    iconMode: 0,

    /**
     * Specifies whether or not the content area of the node should be allowed
     * to wrap.
     * @property nowrap
     * @type boolean