这篇文章显示树形菜单的方式则不再采用layout:'accordion'布局方式.显示的效果就是一棵完整的树.这种效果适合菜单根级节点较多的情况下,因为如果根节点较多,再使用'accordion'布局就会导致树不能够完整显现,或者即使显示了,页面的高度还是有限的,即使出现滚动条,看起来也还是很不舒服的.具体哪种用法,只能够结合具体的项目需求.
树的显示,Ext将其封装的太简单,仅仅几行代码,效果却非同凡响.同时在这个树形菜单里面也同样实现了在节点右键出现菜单的操作.
还是让我们先看看效果图吧.
下面就将页面代码贴出来供大家参考.
1,页面客户端代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="Example_TreeAutoLoad_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<link rel="Stylesheet" type="text/css" href="ExtJS/resources/css/ext-all.css" />
<link rel="Stylesheet" type="text/css" href="ExtJS/resources/css/xtheme-purple.css" />
<script type="text/javascript" src="ExtJS/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ExtJS/ext-all.js"></script>
<script type="text/javascript" src="ExtJS/ext-lang-zh_CN.js"></script>
<style type="text/css">
.panel_icon { background-image:url(images/first.gif)}
.center_icon { background-image:url(images/center.png)}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<script type="text/javascript">
function makeTree()
{
var url = "Json2.aspx";
var loader = new Ext.tree.TreeLoader({url:url});
var root = new Ext.tree.AsyncTreeNode
({
id:"0",
text:"系统管理",
leaf:false,
loader:loader,
expandable:true,
expanded:true
});
var tree = new Ext.tree.TreePanel
({
id:"tree",
root:root,
singleExpand:true,
autoHeight:true,
autoWidth:true,
frame:false,
animate:true
});
var panelTree = new Ext.Panel
({
height:500,
frame:true,
title:"树形菜单之系统管理示例",
items:tree,
renderTo:document.body,
collapsible:true
});
tree.on("contextmenu",function(node,e)
{
var treeMenu = new Ext.menu.Menu
([
{xtype:"button",text:"打开",icon:"images/plugin.gif",pressed:true},
{xtype:"button",text:"添加",icon:"images/plugin.gif",pressed:true},
{xtype:"button",text:"编辑",icon:"images/plugin.gif",pressed:true},
{xtype:"button",text:"隐藏",icon:"images/plugin.gif",pressed:true},
{xtype:"button",text:"删除",icon:"images/plugin.gif",pressed:true}
]);
treeMenu.showAt(e.getPoint());
});
}
</script>
<script type="text/javascript">
function ready()
{
makeTree();
}
Ext.onReady(ready);
</script>
</div>
</form>
</body>
</html>
2,后台代码,这里仅仅将Cs的逻辑部分贴出来,供大家参考.相关实体类的实现请参看提高篇的第七篇文章
using Ext;
using System.Collections.Generic;
using Newtonsoft.Json;
public partial class Json2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request["node"] == null || Convert.ToString(Request["node"]) == "")
return;
List<Ext.TreeNode> nodes = new List<Ext.TreeNode>();
string res2 = "";
try
{
DataSet ds = DataBusiness.GetMoreRow(Convert.ToString(Request["node"]));
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
DataRow row = ds.Tables[0].Rows[i] as DataRow;
Ext.TreeNode node = new Ext.TreeNode();
node.id = Convert.ToString(row["ID"]);
node.parentNodeId = Convert.ToString(Request["node"]); //Convert.ToString(row["ParentID"]);
node.IsRoot = false;
node.leaf = (DataBusiness.HasChildNode(node.id));
node.draggable = true;
node.text = Convert.ToString(row["TypeCName"]);
node.TypeID = Convert.ToString(row["ID"]);
node.PID = Convert.ToString(Request["node"]);
node.TypeTitle = Convert.ToString(row["TypeCName"]);
node.TypeEName = Convert.ToString(row["TypeCName"]);
node.DelFlag = Convert.ToBoolean(row["DelFlag"]);
nodes.Add(node);
}
}
res2 = JavaScriptConvert.SerializeObject(nodes);
}
catch (Exception ee)
{
string error = ee.Message;
}
Response.Write(res2);
}
}
这个功能很具有实用价值,只需对数据库的表换下就能够在不修改任何代码的情况下直接运行.
posted @ 2008-10-28 08:43
殷良胜 阅读(1366)
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