AsyncTreeNode.js
资源名称:ext-3.0.0.zip [点击查看]
上传用户:shuoshiled
上传日期:2018-01-28
资源大小:10124k
文件大小:4k
源码类别:
中间件编程
开发平台:
JavaScript
- /*! * Ext JS Library 3.0.0 * Copyright(c) 2006-2009 Ext JS, LLC * licensing@extjs.com * http://www.extjs.com/license */ /**
- * @class Ext.tree.AsyncTreeNode
- * @extends Ext.tree.TreeNode
- * @cfg {TreeLoader} loader A TreeLoader to be used by this node (defaults to the loader defined on the tree)
- * @constructor
- * @param {Object/String} attributes The attributes/config for the node or just a string with the text for the node
- */
- Ext.tree.AsyncTreeNode = function(config){
- this.loaded = config && config.loaded === true;
- this.loading = false;
- Ext.tree.AsyncTreeNode.superclass.constructor.apply(this, arguments);
- /**
- * @event beforeload
- * Fires before this node is loaded, return false to cancel
- * @param {Node} this This node
- */
- this.addEvents('beforeload', 'load');
- /**
- * @event load
- * Fires when this node is loaded
- * @param {Node} this This node
- */
- /**
- * The loader used by this node (defaults to using the tree's defined loader)
- * @type TreeLoader
- * @property loader
- */
- };
- Ext.extend(Ext.tree.AsyncTreeNode, Ext.tree.TreeNode, {
- expand : function(deep, anim, callback, scope){
- if(this.loading){ // if an async load is already running, waiting til it's done
- var timer;
- var f = function(){
- if(!this.loading){ // done loading
- clearInterval(timer);
- this.expand(deep, anim, callback, scope);
- }
- }.createDelegate(this);
- timer = setInterval(f, 200);
- return;
- }
- if(!this.loaded){
- if(this.fireEvent("beforeload", this) === false){
- return;
- }
- this.loading = true;
- this.ui.beforeLoad(this);
- var loader = this.loader || this.attributes.loader || this.getOwnerTree().getLoader();
- if(loader){
- loader.load(this, this.loadComplete.createDelegate(this, [deep, anim, callback, scope]), this);
- return;
- }
- }
- Ext.tree.AsyncTreeNode.superclass.expand.call(this, deep, anim, callback, scope);
- },
- /**
- * Returns true if this node is currently loading
- * @return {Boolean}
- */
- isLoading : function(){
- return this.loading;
- },
- loadComplete : function(deep, anim, callback, scope){
- this.loading = false;
- this.loaded = true;
- this.ui.afterLoad(this);
- this.fireEvent("load", this);
- this.expand(deep, anim, callback, scope);
- },
- /**
- * Returns true if this node has been loaded
- * @return {Boolean}
- */
- isLoaded : function(){
- return this.loaded;
- },
- hasChildNodes : function(){
- if(!this.isLeaf() && !this.loaded){
- return true;
- }else{
- return Ext.tree.AsyncTreeNode.superclass.hasChildNodes.call(this);
- }
- },
- /**
- * Trigger a reload for this node
- * @param {Function} callback
- * @param {Object} scope (optional) The scope in which to execute the callback.
- */
- reload : function(callback, scope){
- this.collapse(false, false);
- while(this.firstChild){
- this.removeChild(this.firstChild).destroy();
- }
- this.childrenRendered = false;
- this.loaded = false;
- if(this.isHiddenRoot()){
- this.expanded = false;
- }
- this.expand(false, false, callback, scope);
- }
- });
- Ext.tree.TreePanel.nodeTypes.async = Ext.tree.AsyncTreeNode;