treecontextmenu.js

dojo与json创建无限级树的时候,当在父结点下添加了一个新结点,我怎么让父亲结点重新调用json加载一下子结点内容.

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.widget.TreeContextMenu");
dojo.provide("dojo.widget.TreeMenuItem");

dojo.require("dojo.event.*");
dojo.require("dojo.io.*");
dojo.require("dojo.widget.Menu2");


dojo.widget.tags.addParseTreeHandler("dojo:TreeContextMenu");
dojo.widget.tags.addParseTreeHandler("dojo:TreeMenuItem");



dojo.widget.TreeContextMenu = function() {
	dojo.widget.PopupMenu2.call(this);

	this.listenedTrees = [];

}


dojo.inherits(dojo.widget.TreeContextMenu, dojo.widget.PopupMenu2);

dojo.lang.extend(dojo.widget.TreeContextMenu, {

	widgetType: "TreeContextMenu",

	open: function(x, y, parentMenu, explodeSrc){

		var result = dojo.widget.PopupMenu2.prototype.open.apply(this, arguments);

		/* publish many events here about structural changes */
		dojo.event.topic.publish(this.eventNames.open, { menu:this });

		return result;
	},

	listenTree: function(tree) {
		/* add context menu to all nodes that exist already */
		var nodes = tree.getDescendants();

		for(var i=0; i<nodes.length; i++) {
			if (!nodes[i].isTreeNode) continue;
			this.bindDomNode(nodes[i].labelNode);
		}


		/* bind context menu to all nodes that will be created in the future (e.g loaded from server)*/
		var _this = this;
		dojo.event.topic.subscribe(tree.eventNames.createDOMNode, this, "onCreateDOMNode");
		dojo.event.topic.subscribe(tree.eventNames.moveFrom, this, "onMoveFrom");
		dojo.event.topic.subscribe(tree.eventNames.moveTo, this, "onMoveTo");
		dojo.event.topic.subscribe(tree.eventNames.removeNode, this, "onRemoveNode");
		dojo.event.topic.subscribe(tree.eventNames.addChild, this, "onAddChild");
		dojo.event.topic.subscribe(tree.eventNames.treeDestroy, this, "onTreeDestroy");

		this.listenedTrees.push(tree);

	},

	unlistenTree: function(tree) {
		/* clear event listeners */

		dojo.event.topic.unsubscribe(tree.eventNames.createDOMNode, this, "onCreateDOMNode");
		dojo.event.topic.unsubscribe(tree.eventNames.moveFrom, this, "onMoveFrom");
		dojo.event.topic.unsubscribe(tree.eventNames.moveTo, this, "onMoveTo");
		dojo.event.topic.unsubscribe(tree.eventNames.removeNode, this, "onRemoveNode");
		dojo.event.topic.unsubscribe(tree.eventNames.addChild, this, "onAddChild");
		dojo.event.topic.unsubscribe(tree.eventNames.treeDestroy, this, "onTreeDestroy");

		for(var i=0; i<this.listenedTrees.length; i++){
           if(this.listenedTrees[i] === tree){
                   this.listenedTrees.splice(i, 1);
                   break;
           }
		}
	},

	onTreeDestroy: function(message) {
		this.unlistenTree(message.source);
	},

	bindTreeNode: function(node) {
		var _this = this;
		//dojo.debug("bind to "+node);
		dojo.lang.forEach(node.getDescendants(),
			function(e) {_this.bindDomNode(e.labelNode); }
		);
	},


	unBindTreeNode: function(node) {
		var _this = this;
		//dojo.debug("Unbind from "+node);
		dojo.lang.forEach(node.getDescendants(),
			function(e) {_this.unBindDomNode(e.labelNode); }
		);
	},

	onCreateDOMNode: function(message) {
		this.bindTreeNode(message.source);
	},


	onMoveFrom: function(message) {
		if (!dojo.lang.inArray(this.listenedTrees, message.newTree)) {
			this.unBindTreeNode(message.child);
		}
	},

	onMoveTo: function(message) {
		if (dojo.lang.inArray(this.listenedTrees, message.newTree)) {
			this.bindTreeNode(message.child);
		}
	},

	onRemoveNode: function(message) {
		this.unBindTreeNode(message.child);
	},

	onAddChild: function(message) {
		if (message.domNodeInitialized) {
			// dom node was there already => I did not process onNodeDomCreate
			this.bindTreeNode(message.child);
		}
	}


});






dojo.widget.TreeMenuItem = function() {
	dojo.widget.MenuItem2.call(this);

}


dojo.inherits(dojo.widget.TreeMenuItem, dojo.widget.MenuItem2);


dojo.lang.extend(dojo.widget.TreeMenuItem, {

	widgetType: "TreeMenuItem",

	// treeActions menu item performs following actions (to be checked for permissions)
	treeActions: "",

	initialize: function(args, frag) {

		this.treeActions = this.treeActions.split(",");
		for(var i=0; i<this.treeActions.length; i++) {
			this.treeActions[i] = this.treeActions[i].toUpperCase();
		}

	},

	getTreeNode: function() {
		var menu = this;

		while (! (menu instanceof dojo.widget.TreeContextMenu) ) {
			menu = menu.parent;
		}

		var source = menu.getTopOpenEvent().target;

		while (!source.getAttribute('treeNode') && source.tagName != 'body') {
			source = source.parentNode;
		}
		if (source.tagName == 'body') {
			dojo.raise("treeNode not detected");
		}
		var treeNode = dojo.widget.manager.getWidgetById(source.getAttribute('treeNode'));

		return treeNode;
	},


	menuOpen: function(message) {
		var treeNode = this.getTreeNode();

		this.setDisabled(false); // enable by default

		var _this = this;
		dojo.lang.forEach(_this.treeActions,
			function(action) {
				_this.setDisabled( treeNode.actionIsDisabled(action) );
			}
		);

	},

	toString: function() {
		return "["+this.widgetType+" node "+this.getTreeNode()+"]";
	}

});