treeview.js

一个很不错的...ajax树..支持复选框

     * @TODO i changed this method add a param oIndex
     */
    init: function(oData, oParent, expanded, oIndex) {

        this.data       = oData;
        this.children   = [];
        this.index      = oIndex;
        ++YAHOO.widget.TreeView.nodeCount;
        this.expanded   = expanded;

        /**
         * The parentChange event is fired when a parent element is applied
         * to the node.  This is useful if you need to apply tree-level
         * properties to a tree that need to happen if a node is moved from
         * one tree to another.
         *
         * @event parentChange
         * @type CustomEvent
         */
        this.createEvent("parentChange", this);

        // oParent should never be null except when we create the root node.
        if (oParent) {
            oParent.appendChild(this);
        }
    },

    /**
     * Certain properties for the node cannot be set until the parent
     * is known. This is called after the node is inserted into a tree.
     * the parent is also applied to this node's children in order to
     * make it possible to move a branch from one tree to another.
     * @method applyParent
     * @param {Node} parentNode this node's parent node
     * @return {boolean} true if the application was successful
     */
    applyParent: function(parentNode) {
        if (!parentNode) {
            return false;
        }

        this.tree   = parentNode.tree;
        this.parent = parentNode;
        this.depth  = parentNode.depth + 1;

        if (!this.href) {
            this.href = "javascript:" + this.getToggleLink();
        }

        // @todo why was this put here.  This causes new nodes added at the
        // root level to lose the menu behavior.
        // if (! this.multiExpand) {
            // this.multiExpand = parentNode.multiExpand;
        // }

        this.tree.regNode(this);
        parentNode.childrenRendered = false;

        // cascade update existing children
        for (var i=0, len=this.children.length;i<len;++i) {
            this.children[i].applyParent(this);
        }

        this.fireEvent("parentChange");

        return true;
    },

    /**
     * Appends a node to the child collection.
     * @method appendChild
     * @param childNode {Node} the new node
     * @return {Node} the child node
     * @private
     */
    appendChild: function(childNode) {
        if (this.hasChildren()) {
            var sib = this.children[this.children.length - 1];
            sib.nextSibling = childNode;
            childNode.previousSibling = sib;
        }
        this.children[this.children.length] = childNode;
        childNode.applyParent(this);

        return childNode;
    },

    /**
     * Appends this node to the supplied node's child collection
     * @method appendTo
     * @param parentNode {Node} the node to append to.
     * @return {Node} The appended node
     */
    appendTo: function(parentNode) {
        return parentNode.appendChild(this);
    },

    /**
    * Inserts this node before this supplied node
    * @method insertBefore
    * @param node {Node} the node to insert this node before
    * @return {Node} the inserted node
    */
    insertBefore: function(node) {
        var p = node.parent;
        if (p) {

            if (this.tree) {
                this.tree.popNode(this);
            }

            var refIndex = node.isChildOf(p);
            p.children.splice(refIndex, 0, this);
            if (node.previousSibling) {
                node.previousSibling.nextSibling = this;
            }
            this.previousSibling = node.previousSibling;
            this.nextSibling = node;
            node.previousSibling = this;

            this.applyParent(p);
        }

        return this;
    },
 
    /**
    * Inserts this node after the supplied node
    * @method insertAfter
    * @param node {Node} the node to insert after
    * @return {Node} the inserted node
    */
    insertAfter: function(node) {
        var p = node.parent;
        if (p) {

            if (this.tree) {
                this.tree.popNode(this);
            }

            var refIndex = node.isChildOf(p);

            if (!node.nextSibling) {
                this.nextSibling = null;
                return this.appendTo(p);
            }

            p.children.splice(refIndex + 1, 0, this);

            node.nextSibling.previousSibling = this;
            this.previousSibling = node;
            this.nextSibling = node.nextSibling;
            node.nextSibling = this;

            this.applyParent(p);
        }

        return this;
    },

    /**
    * Returns true if the Node is a child of supplied Node
    * @method isChildOf
    * @param parentNode {Node} the Node to check
    * @return {boolean} The node index if this Node is a child of 
    *                   supplied Node, else -1.
    * @private
    */
    isChildOf: function(parentNode) {
        if (parentNode && parentNode.children) {
            for (var i=0, len=parentNode.children.length; i<len ; ++i) {
                if (parentNode.children[i] === this) {
                    return i;
                }
            }
        }

        return -1;
    },

    /**
     * Returns a node array of this node's siblings, null if none.
     * @method getSiblings
     * @return Node[]
     */
    getSiblings: function() {
        return this.parent.children;
    },

    /**
     * Shows this node's children
     * @method showChildren
     */
    showChildren: function() {
        if (!this.tree.animateExpand(this.getChildrenEl(), this)) {
            if (this.hasChildren()) {
                this.getChildrenEl().style.display = "";
            }
        }
    },

    /**
     * Hides this node's children
     * @method hideChildren
     */
    hideChildren: function() {

        if (!this.tree.animateCollapse(this.getChildrenEl(), this)) {
            this.getChildrenEl().style.display = "none";
        }
    },

    /**
     * Returns the id for this node's container div
     * @method getElId
     * @return {string} the element id
     */
    getElId: function() {
        return "ygtv" + this.index;
    },

    /**
     * Returns the id for this node's children div
     * @method getChildrenElId
     * @return {string} the element id for this node's children div
     */
    getChildrenElId: function() {
        return "ygtvc" + this.index;
    },

    /**
     * Returns the id for this node's toggle element
     * @method getToggleElId
     * @return {string} the toggel element id
     */
    getToggleElId: function() {
        return "ygtvt" + this.index;
    },


    /*
     * Returns the id for this node's spacer image.  The spacer is positioned
     * over the toggle and provides feedback for screen readers.
     * @method getSpacerId
     * @return {string} the id for the spacer image
     */
    /*
    getSpacerId: function() {
        return "ygtvspacer" + this.index;
    }, 
    */

    /**
     * Returns this node's container html element
     * @method getEl
     * @return {HTMLElement} the container html element
     */
    getEl: function() {
        return document.getElementById(this.getElId());
    },

    /**
     * Returns the div that was generated for this node's children
     * @method getChildrenEl
     * @return {HTMLElement} this node's children div
     */
    getChildrenEl: function() {
        return document.getElementById(this.getChildrenElId());
    },

    /**
     * Returns the element that is being used for this node's toggle.
     * @method getToggleEl
     * @return {HTMLElement} this node's toggle html element
     */
    getToggleEl: function() {
        return document.getElementById(this.getToggleElId());
    },

    /*
     * Returns the element that is being used for this node's spacer.
     * @method getSpacer
     * @return {HTMLElement} this node's spacer html element
     */
    /*
    getSpacer: function() {
        return document.getElementById( this.getSpacerId() ) || {};
    },
    */

    /*
    getStateText: function() {
        if (this.isLoading) {
            return this.loadingText;
        } else if (this.hasChildren(true)) {
            if (this.expanded) {
                return this.expandedText;
            } else {
                return this.collapsedText;
            }
        } else {
            return "";
        }
    },
    */

    /**
     * Generates the link that will invoke this node's toggle method
     * @method getToggleLink
     * @return {string} the javascript url for toggling this node
     */
    getToggleLink: function() {
        return "YAHOO.widget.TreeView.getNode(\'" + this.tree.id + "\'," + 
            this.index + ").toggle()";
    },

    /**
     * Hides this nodes children (creating them if necessary), changes the
     * @method collapse
     * toggle style.
     */
    collapse: function() {
        // Only collapse if currently expanded
        if (!this.expanded) { return; }

        // fire the collapse event handler
        var ret = this.tree.onCollapse(this);

        if (false === ret) {
            return;
        }

        ret = this.tree.fireEvent("collapse", this);

        if (false === ret) {
            return;
        }


        if (!this.getEl()) {
            this.expanded = false;
        } else {
            // hide the child div
            this.hideChildren();
            this.expanded = false;

            this.updateIcon();
        }

        // this.getSpacer().title = this.getStateText();

        ret = this.tree.fireEvent("collapseComplete", this);

    },

    /**
     * Shows this nodes children (creating them if necessary), changes the
     * toggle style, and collapses its siblings if multiExpand is not set.
     * @method expand
     */
    expand: function() {
        // Only expand if currently collapsed.
        if (this.expanded) { return; }

        // fire the expand event handler
        var ret = this.tree.onExpand(this);

        if (false === ret) {
            return;
        }
        
        ret = this.tree.fireEvent("expand", this);

        if (false === ret) {
            return;
        }

        if (!this.getEl()) {
            this.expanded = true;
            return;
        }

        if (! this.childrenRendered) {
            this.getChildrenEl().innerHTML = this.renderChildren();
        } else {
        }

        this.expanded = true;

        this.updateIcon();

        // this.getSpacer().title = this.getStateText();

        // We do an extra check for children here because the lazy
        // load feature can expose nodes that have no children.

        // if (!this.hasChildren()) {
        if (this.isLoading) {
            this.expanded = false;
            return;
        }

        if (! this.multiExpand) {
            var sibs = this.getSiblings();
            for (var i=0; i<sibs.length; ++i) {
                if (sibs[i] != this && sibs[i].expanded) { 
                    sibs[i].collapse(); 
                }
            }
        }

        this.showChildren();

        ret = this.tree.fireEvent("expandComplete", this);
    },

    updateIcon: function() {
        if (this.hasIcon) {
            var el = this.getToggleEl();
            if (el) {
                el.className = this.getStyle();
            }
        }
    },

    /**
     * Returns the css style name for the toggle
     * @method getStyle
     * @return {string} the css class for this node's toggle
     */
    getStyle: function() {
        if (this.isLoading) {
            return "ygtvloading";
        } else {
            // location top or bottom, middle nodes also get the top style
            var loc = (this.nextSibling) ? "t" : "l";

            // type p=plus(expand), m=minus(collapase), n=none(no children)
            var type = "n";
            if (this.hasChildren(true) || (this.isDynamic() && !this.getIconMode())) {
            // if (this.hasChildren(true)) {
                type = (this.expanded) ? "m" : "p";
            }

            return "ygtv" + loc + type;
        }
    },

    /**
     * Returns the hover style for the icon
     * @return {string} the css class hover state