treeloader数据源

treeloader数据源 - Web 开发 / Ajax
怎么通过后台的action把数据传到树的节点，传递的数据格式有没有限制

[解决办法]
Ext.onReady(function(){

Ext.BLANK_IMAGE_URL = "../ext/resources/images/default/s.gif";

var loader = new Ext.tree.TreeLoader({
url: 'result.jsp'
});

var root = new Ext.tree.AsyncTreeNode({
text: '系统功能',
loader: loader
});

var tree = new Ext.tree.TreePanel({
title: '菜单',
width: 200,
height: 200,
renderTo: Ext.getBody(),
root: root // 根节点
});

tree.expandAll();

});

result.jsp:

<%@ page language="java" pageEncoding="utf-8"%>
[
{
text: '产品管理',
children: [
{
text: '增加产品',
listeners:{
'click':function(){
alert('增加产品成功！');
}
},
leaf: true
},
{
text: '维护产品',
href: 'a.jsp',
hrefTarget: 'main',
leaf: true
}
]
},
{
text: '入库单管理',
leaf: true
},
{
text: '用户管理',
leaf: true
}
]

[解决办法]
可以传xml也可以传json的。

JScript code

Ext.onReady(function(){    // shorthand    var Tree = Ext.tree;        var tree = new Tree.TreePanel({        el:'tree-div',        useArrows:true,        autoScroll:true,        animate:true,        enableDD:true,        containerScroll: true,         loader: new Tree.TreeLoader({            dataUrl:'get-nodes.jsp'        })    });    // set the root node    var root = new Tree.AsyncTreeNode({        text: 'Ext JS',        draggable:false,        id:'source'    });    tree.setRootNode(root);    // render the tree    tree.render();    root.expand();});
[解决办法]
使用json-lib
String json = JSONArray.fromObject(beanList).toString();
response.setContentType("text/json;charset=UTF-8");
response.getWriter().println(json);
格式为 [{id: 'a1',text: '节点1',leaf: true},{id: 'a2',text: '节点2',leaf: true}]

request.getParameter("node"); 树异步加载时 这个能得到每次父节点的id 如 a1,a2