Ajax Tree (转)

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Ajax Tree</title>
<link type="text/css" href="http://www.cnblogs.com/Styles/tree_css/tree.css" rel="stylesheet">
</head>
<body>
<form id="Form1" runat="server">
<div class="TreeMenu" id="CategoryTree" style=" 100%; height: 489px">
</div>
<script language="javascript" type="text/javascript">
function el(id)
{
return document.getElementById(id);
}
function ExpandSubCategory(iCategoryID)
{
var li_father = el("li_" + iCategoryID);
if (li_father.getElementsByTagName("li").length > 0) //分类已下载
{
ChangeStatus(iCategoryID);
return;
}

li_father.className = "Opened";

switchNote(iCategoryID, true);
AjaxMethod.GetSubCategory(iCategoryID, GetSubCategory_callback);
}

function GetSubCategory_callback(response)
{
var dt = response.value.Tables[0];
if (dt.Rows.length > 0)
{
var iCategoryID = dt.Rows[0].FatherID;
}
var li_father = el("li_" + iCategoryID);
var ul = document.createElement("ul");
for (var i = 0;i < dt.Rows.length;i++)
{
if (dt.Rows[i].IsChild == 1) //叶子节点
{
var li = document.createElement("li");
li.className = "Child";
li.id = "li_" + dt.Rows[i].CategoryID;

var img = document.createElement("img");
img.id = dt.Rows[i].CategoryID;
img.className = "s";
img.src = "http://www.cnblogs.com/Styles/tree_css/s.gif";

var a = document.createElement("a");
var id = dt.Rows[i].CategoryID;
a.onmouseover = function()
{
PreviewImage(id);
};
a.href = "javascript:OpenDocument('" + dt.Rows[i].CategoryID + "');";
a.innerHTML = dt.Rows[i].CategoryName;
}
else
{
var li = document.createElement("li");
li.className = "Closed";
li.id = "li_" + dt.Rows[i].CategoryID;

var img = document.createElement("img");
img.id = dt.Rows[i].CategoryID;
img.className = "s";
img.src = "http://www.cnblogs.com/Styles/tree_css/s.gif";
img.onclick = function () {
ExpandSubCategory(this.id);
};
img.alt = "展开/折叠";

var a = document.createElement("a");
a.href = "javascript:ExpandSubCategory(" +
dt.Rows[i].CategoryID + ");";
a.innerHTML = dt.Rows[i].CategoryName;
}
li.appendChild(img);
li.appendChild(a);
ul.appendChild(li);
}
li_father.appendChild(ul);

switchNote(iCategoryID, false);
}

// 叶子节点的单击响应函数
function OpenDocument(iCategoryID)
{
// 预加载信息
PreloadFormUrl(iCategoryID);
}

function PreviewImage(iCategoryID)
{

}

function ChangeStatus(iCategoryID)
{
var li_father = el("li_" + iCategoryID);
if (li_father.className == "Closed")
{
li_father.className = "Opened";
}
else
{
li_father.className = "Closed";
}
}

function switchNote(iCategoryID, show)
{
var li_father = el("li_" + iCategoryID);
if (show)
{
var ul = document.createElement("ul");
ul.id = "ul_note_" + iCategoryID;

var note = document.createElement("li");
note.className = "Child";

var img = document.createElement("img");
img.className = "s";
img.src = "http://www.cnblogs.com/Styles/tree_css/s.gif";

var a = document.createElement("a");
a.href = "javascript:void(0);";
a.innerHTML = "请稍候";

note.appendChild(img);
note.appendChild(a);
ul.appendChild(note);
li_father.appendChild(ul);
}
else
{
var ul = el("ul_note_" + iCategoryID);
if (ul)
{
li_father.removeChild(ul);
}
}
}

// 加载根节点
var tree = el("CategoryTree");
var root = document.createElement("li");
root.id = "li_0";
tree.appendChild(root);

// 加载页面时显示第一级分类
ExpandSubCategory(0);

function PreloadFormUrl(iCategoryID)
{
// 采用同步调用的方式获取图片的信息
var ds = AjaxMethod.GetFormsList(iCategoryID).value;
// 如果返回了结果
if (ds)
{
// 判断数据表是否不为空
if (ds.Tables[0].Rows.length > 0)
{
// 返回的信息数据表
dt = ds.Tables[0];
el("furl").src = dt.Rows[0].FormUrl;
}
else // 分类下没有
{
}
}
}
</script>
</form>
</body>
</html>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using AjaxPro;

public partial class Pages_Home_HomePage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
AjaxPro.Utility.RegisterTypeForAjax(typeof(AjaxMethod));
}
}

a
{
text-decoration:none;
}
a,a:visited
{
color:#000;
background:inherit;
}
body
{
margin:0;
padding:20px;
font:12px tahoma,宋体,sans-serif;
}
dt
{
font-size:22px;
font-weight:bold;
margin:0 0 0 15px;
}
dd
{
margin:0 0 0 15px;
}
h4
{
margin:0;
padding:0;
font-size:18px;
text-align:center;
}
p
{
margin:0;
padding:0 0 0 18px;
}
p a,p a:visited
{
color:#00f;
background:inherit;
}

.TreeMenu img.s
{
cursor:hand;
vertical-align:middle;
}
.TreeMenu ul
{
padding:0;
}
.TreeMenu li
{
list-style:none;
padding:0;
}
.Closed ul
{
display:none;
}
.Child img.s
{
background:none;
cursor:default;
}

#CategoryTree ul
{
margin:0 0 0 17px;
}
#CategoryTree img.s
{
width:34px;
height:18px;
}
#CategoryTree .Opened img.s
{
background:url(skin3/opened.gif) no-repeat 0 1px;
}
#CategoryTree .Closed img.s
{
background:url(skin3/closed.gif) no-repeat 0 1px;
}
#CategoryTree .Child img.s
{
background:url(skin3/child.gif) no-repeat 13px 2px;
}

#CategoryTree
{
float:left;
width:249px;
border:1px solid #99BEEF;
background:#D2E4FC;
color:inherit;
margin:3px;
padding:3px;
height:600px;
}

using System;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using AjaxPro;

/**//// <summary>

/// Summary description for AjaxMethod

/// </summary>

public class AjaxMethod

{

public AjaxMethod()

{

// TODO: Add constructor logic here

}

[AjaxMethod(HttpSessionStateRequirement.ReadWrite)]

public static DataSet GetSubCategory(int iCategoryID)

{

string sql = string.Format("SELECT CategoryID, CategoryName, FatherID, dbo.IsLeaf(CategoryID) as IsChild FROM Category WHERE FatherID = {0}", iCategoryID);

return GetDataSet(sql);

}

[AjaxMethod(HttpSessionStateRequirement.ReadWrite)]

public static DataSet GetFormsList(int iCategoryID)

{

string sql = string.Format("SELECT * FROM forms WHERE form_category_id = {0}", iCategoryID);

return GetDataSet(sql);

}

public static string ConnectionString = ConfigurationSettings.AppSettings["ConnectionString"].ToString();

public static DataSet GetDataSet(string sql)

{

SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);

DataSet ds = new DataSet();

sda.Fill(ds);

if (ds != null)

return ds;

else

return null;

}

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Category]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

drop table [dbo].[Category]

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Forms]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

drop table [dbo].[Forms]

CREATE TABLE [dbo].[Category] (

[CategoryID] [int] IDENTITY (1, 1) NOT NULL ,

[CategoryName] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,

[FatherID] [int] NULL

) ON [PRIMARY]

CREATE TABLE [dbo].[Forms] (

[FormID] [int] IDENTITY (1, 1) NOT NULL ,

[FormName] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,

[FormUrl] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,

[Form_category_id] [int] NULL ,

[target] [char] (10) COLLATE Chinese_PRC_CI_AS NULL

) ON [PRIMARY]

CREATE FUNCTION IsLeaf (@cat_id int)

RETURNS int AS

BEGIN

declare @count int

select @count = (select count(*) from Category where FatherID=@cat_id)

if (@count=0)

return 1

return 0

END