日期:2011-07-10  浏览次数:20380 次

注:ajax的.net组件可以到此网下载,我用的是for .net 1.1版本的。
       http://ajax.schwarz-interactive.de/
  1. 在引用中添加引用Ajax.dll。(这个很废话)

  2.在web.config中建立HttpHandler(这个当然是在system.web串里的)

<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
</httpHandlers> 

  3.在Global的Application_Start里加上个设置

protected void Application_Start(Object sender, EventArgs e)
{
 Ajax.Utility.HandlerPath = "ajax";
}

  4.新建一个类DemoMethods,这个类里面提供了更新数据库和输出列表的方法。其实主要思想就是获得控件运行后生成的html,然后输出。

1 [Ajax.AjaxMethod]
2 public int AddAjaxTable(string name)
3 {
4  //输入一个字符串,然后更新
5  SqlConnection conn = new SqlConnection( System.Configuration.ConfigurationSettings.AppSettings["connectionString"] );
6  SqlCommand cmd = new SqlCommand("insert into ajaxTable(name) values(’"+name+"’)", conn);
7  cmd.Connection.Open();
8  int result = cmd.ExecuteNonQuery();
9  conn.Dispose();
10  cmd.Dispose();
11  return result;
12 }
13
14 [Ajax.AjaxMethod]
15 public string GetAjaxTable()
16 {
17  //这个方法就是拿到datagrid生成出来的html
18  SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["connectionString"]);
19  SqlCommand cmd = new SqlCommand("select * from ajaxTable order by id", conn);
20  SqlDataAdapter ap = new SqlDataAdapter( cmd );
21  DataSet ds = new DataSet();
22  ap.SelectCommand.Connection.Open();
23  ap.Fill( ds, "db" );
24
25  conn.Dispose();
26  cmd.Dispose();
27
28  //实例化一个datagird类并设置好数据源
29  DataGrid dg = new DataGrid();
30  dg.DataSource = ds.Tables["db"];
31  dg.DataBind();
32
33  //实例化一个HtmlTextWriter的类
34  System.Text.StringBuilder strb = new System.Text.StringBuilder();
35  System.IO.StringWriter sw = new System.IO.StringWriter( strb );
36  System.Web.UI.HtmlTextWriter htw = new HtmlTextWriter( sw );
37
38  //执行控件的render并输出到HtmlTextWriter里
39  dg.RenderControl( htw );
40
41  string s = strb.ToString();
42
43  return s;//最后就是返回这个html啦
44 }

  5.然后再建一个default.js文件,用作存放 js方法

function AddAjax(name)
{
 DemoMethods.AddAjaxTable(name);
 LoadGrid();
}

function LoadGrid()
{
 var cc=document.getElementById("UCtd");
 cc.innerHTML=DemoMethods.GetAjaxTable().value;
}

  6.建一个default.aspx,在pageload事件里面加个注册的东西

private void Page_Load(object sender, System.EventArgs e)
{
 Ajax.Utility.RegisterTypeForAjax(typeof(AjaxTestPrjLib.DemoMethods));
}

  7.最后就是default.aspx的html和js了。

<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false" Inherits="AjaxTextPrjWeb._default" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
 <title>default</title>
 <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
 <meta name="CODE_LANGUAGE" Content="C#">
 <meta name="vs_defaultClients cript" content="Javas cript">
 <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5";>
<s cript language="javas cript" src="default.js"></s _fcksavedurl=""default.js"></s" cript>
</HEAD>
<body >
<form id="Form1" method="post" runat="server">
 <INPUT type="text" id="AddTextBox" maxlength="10"><INPUT type="button" value="添加" >
 <table>
  <tr>
   <td id="UCtd"></td>
  </tr>
 </table>
</form>
</body>
</HTML>