前两天在网上下了个ajax组件体验了一下,感觉很不错。但后来开始想怎样能让它跟server控件交互呢,例如我上输出一个列表,就只有用js一条一条html的输出吗?不!!现在我说说怎样与 datagrid交互。
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
DataSetds = 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_defaultClientScript" content="JavaScript"
>
<
meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"
>
<
script language="javascript" src="/default.js"
><
/script
>
<
/HEAD
>
<
body onload="LoadGrid()"
>
<
form id="Form1" method="post" runat="server"
>
<
INPUT type="text" id="AddTextBox" maxlength="10"
><
INPUT type="button" value="
添加
" onclick="javascript:AddAjax(form.AddTextBox.value);"
>
<
table
>
<
tr
>
<
td id="UCtd"
><
/td
>
<
/tr
>
<
/table
>
<
/form
>
<
/body
>
<
/HTML
>