Extjs 与 struts2 实现 异步加载树的实例 急用啊！！！！！！！！！！！

Question

就是页面首先有一根节点，点击根节点从数据库查找他的子节点，点击子节点，再查找他的子节点。急用啊！！！！！

Answer 1

其实也不难！大致思路如下
this.initUserTreepanel = function() {
 this.userTreepanel = new Ext.tree.TreePanel({
             renderTo : 'tree_menu_'+this.pageId,
             region:'north',
             split:true,
             width: 200,
             height : (this.getBodyHeight(0)-10),
             collapsible: false,
             margins:'5 0 5 0',
             loader: this.treeLoader,
             rootVisible:true,
             lines: false,
             singleClickExpand : true,
             autoScroll:true,
             root: new Ext.tree.AsyncTreeNode({text:"树",id:'-1',expanded:true}),
            listeners: {            
           'click' : function(node,e) {
              this.commit(node);
           }
        }      
         });
};this.commit = function(node) {  
if(typeof node == "undefined") {
node =  this.userTreepanel.getSelectionModel().getSelectedNode();
}
if (node.attributes.id == -1) {  //判断一下，就OK了
this.refreshDatas();
} else {
this.loadCompanyUsers(node.attributes.id);
}

};

Answer 2

refreshDatas（）这个如何实现的呀？