Extjs入门之动态加载树代码

作者: 性福不幸福231455
来源: 51数据库
2020-08-07

Extjs动态加载树的实现代码，需要的朋友可以参考下。 Extjs动态加载树，首先在数据库里面设计存放树信息的表

复制代码代码如下:

 
USE [KimiExtjs] 
GO 
/****** 对象: Table [dbo].[Trees] 脚本日期: 04/08/2010 22:12:25 ******/ 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
SET ANSI_PADDING ON 
GO 
CREATE TABLE [dbo].[Trees]( 
[Tid] [varchar](40) COLLATE Chinese_PRC_CI_AS NOT NULL,---节点ID 主键 Guid 
[ParentId] [varchar](40) COLLATE Chinese_PRC_CI_AS NULL,---父亲节点ID 0表示为根目录 
[ContentText] [varchar](800) COLLATE Chinese_PRC_CI_AS NULL,---节点现实内容 
[StrHref] [varchar](800) COLLATE Chinese_PRC_CI_AS NULL,---节点链接地址 
[hrefTarget] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,---Target 
CONSTRAINT [PK_Trees] PRIMARY KEY CLUSTERED 
( 
[Tid] ASC 
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY] 
) ON [PRIMARY] 
GO 
SET ANSI_PADDING OFF 

构建完数据表后，我们将开始应运程序的开发，首先页面的设计，html代码如下：

复制代码代码如下:

 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Main.aspx.cs" Inherits="Com.KimiYang.Web.Main" %> 
<!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 id="Head1" runat="server"> 
<title>无标题页</title> 
<link  rel="stylesheet" type="text/css" /> 
<link  rel="stylesheet" type="text/css" /> 
<link  rel="stylesheet" type="text/css" /> 
<script src="Extjs3.2.0/adapter/ext/ext-base.js" type="text/javascript"></script> 
<script src="Extjs3.2.0/ext-all.js" type="text/javascript"></script> 
<script src="Extjs3.2.0/src/locale/ext-lang-zh_CN.js" type="text/javascript"></script> 
<script src="JS/Main.js" type="text/javascript"></script> 
<script src="JS/NowTime.js" type="text/javascript"></script> 
<base target="_self" /> 
</head> 
<body onload="getCurrentTime()"> 
<form id="form1" runat="server"> 
<div id="loading-mask" style=""></div> 
<div id="loading"> 
<div class="loading-indicator"><img src="Extjs3.2.0/resources/images/vista/s.gif" width="32" height="32" style="margin-right:8px;" align="absmiddle"/>Loading...</div> 
</div> 
<div id="header"><h1>KimiYang</h1></div> 
<div class="menu"> 
<span style="float: left">欢迎  <b>admin  <span id="myTime"/></span></b>   
  </span> 
<span id="aLoginOut" runat="server" style="float: right"><a onclick="if (!window.confirm('您确认要注消当前登录用户吗？')){return false;}" 
>注销</a></span> 
</div> 
<div id="north"></div> 
<div id="west"> 
</div> 
<div id="center"> 
</div> 
<div id="west_content" style="height:300px; "> 
</div> 
</form> 
</body> 
</html> 

js代码如下所示:

复制代码代码如下:

 
Ext.onReady(function(){ 
Ext.BLANK_IMAGE_URL="Extjs3.2.0/resources/images/default/s.gif"; 
var Tree = Ext.tree; 
var tree = new Tree.TreePanel({ 
el:'west_content',//渲染到 
useArrows:true, 
autoHeight:true, 
split:true, 
lines:true, 
autoScroll:true, 
animate:true, 
enableDD:true, 
border:false, 
containerScroll: true, 
loader: new Tree.TreeLoader({ 
dataUrl:'ServletHandlers/GetTrees.ashx' 
}) 
}); 
var root = new Tree.AsyncTreeNode({ 
text: 'KimiYang', 
draggable:true, 
id:'0' 
}); 
tree.setRootNode(root); 
tree.render(); 
root.expand(); 
var viewport = new Ext.Viewport({ 
layout:'border', 
items:[{ 
region:'west', 
id:'west', 
title:'菜单导航', 
split:true, 
width: 200, 
minSize: 200, 
maxSize: 400, 
collapsible: true, 
margins:'60 0 2 2', 
cmargins:'60 5 2 2', 
layout:'fit', 
layoutConfig:{ activeontop:true}, 
defaults: { bodyStyle: 'margin:0;padding:0;'}, 
items: 
new Ext.TabPanel({ 
border:false, 
activeTab:0, 
tabPosition:'bottom', 
items:[{ 
contentEl:'west_content', 
title:'系统管理', 
autoScroll:true, 
bodyStyle:'padding:5px;' 
}, 
{ 
title:'网上办公', 
autoScroll:true, 
bodyStyle:'padding:5px;' 
}] 
}) 
},{ 
region:'center', 
el:'center', 
deferredRender:false, 
margins:'60 0 2 0', 
html:'<iframe id="center-iframe" width="100%" height=100% name="main" frameborder="0" scrolling="auto" style="border:0px none; background-color:#BBBBBB; " ></iframe>', 
autoScroll:true 
}, 
{ 
region:'south', 
margins:'0 0 0 2', 
border:false, 
html:'<div class="menu south">Copyright © 2009 浙江新昌 Kimi Yang All Rights Reserved</div>' 
} 
] 
}); 
setTimeout(function(){ 
Ext.get('loading').remove(); 
Ext.get('loading-mask').fadeOut({remove:true}); 
}, 250) 
}); 

C#代码如下图所示:

复制代码代码如下:

 
using System; 
using System.Collections; 
using System.Data; 
using System.Linq; 
using System.Web; 
using System.Web.Services; 
using System.Web.Services.Protocols; 
using System.Xml.Linq; 
namespace Com.KimiYang.Web.ServletHandlers 
{ 
/// <summary> 
/// $codebehindclassname$ 的摘要说明 
/// </summary> 
[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
public class GetTrees : IHttpHandler 
{ 
public void ProcessRequest(HttpContext context) 
{ 
string strSql = "select Tid,ParentId,ContentText,StrHref,hrefTarget from Trees"; 
dbOperator db = new dbOperator(); 
DataTable dt = db.Execute(strSql); 
string strResult = "["; 
if (dt.Rows.Count > 0) 
{ 
DataRow[] dr = dt.Select("ParentId='0'"); 
strResult = DtTreeToJson(dt, strResult, dr); 
} 
strResult += "]"; 
context.Response.ContentType = "text/plain"; 
context.Response.Write(strResult.ToString()); 
context.Response.End(); 
} 
private static string DtTreeToJson(DataTable dt, string strResult, DataRow[] dr) 
{ 
if (dr.Length > 0) 
{ 
for (int i = 0; i < dr.Length; i++) 
{ 
strResult += "{"; 
strResult += "text:'" + dr[i]["ContentText"] + "',"; 
strResult += "id:'" + dr[i]["Tid"] + "',"; 
DataRow[] drChild = dt.Select("ParentId='" + dr[i]["Tid"] + "'"); 
if (drChild.Length > 0) 
{ 
strResult += "leaf:false,"; 
strResult += "children:["; 
strResult = DtTreeToJson(dt, strResult, drChild); 
strResult += "]"; 
} 
else 
{ 
strResult += "href:'" + dr[i]["StrHref"] + "',"; 
strResult += "hrefTarget:'" + dr[i]["hrefTarget"] + "',"; 
strResult += "leaf:true"; 
} 
strResult += "}"; 
if (i != dr.Length - 1) 
strResult += ","; 
} 
} 
return strResult; 
} 
public bool IsReusable 
{ 
get 
{ 
return false; 
} 
} 
} 
} 

页面效果图：

源代码下载ExtjsTree.rar