Ajax使用初步 (.net)

Ajax定义为“Asynchronous html" class="wordstyle">JavaScript + XML”的简称，也就是异步的html" class="wordstyle">JavaScript和XML处理。从原理上看，主要是Ajax可以通过调用HttpRequest实现与服务器的异步通讯，并最终在网页中实现丰富友好的用户界面
Ajax使用初步，配置步骤
1.把Ajax.dll copy到应用系统bin目录下，然后在工程引用中引用Ajax.dll，如果没有的话可以到网上下载
2.配置web.config，添加如下信息

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"><httpHandlers>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"></httpHandlers>

3.假设应用系统叫Document，目录格式为Pages\AjaxTest
4.在Pages\AjaxTest下建立cs文件AjaxForm.cs，添加如下方法

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">//[Ajax.AjaxMethod]

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">public static string GetNIVNumber(string str)

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">{

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> return str;

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">}

5.在Pages\AjaxTest下建立页面AjaxForm.html" class="wordstyle">aspx

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"><HTML>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <HEAD>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <title>AjaxForm</title>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <meta name="CODE_LANGUAGE" Content="C#">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <meta name="vs_defaultClientScript" content="html" class="wordstyle">JavaScript">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <script language="html" class="wordstyle">javascript">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> function testAjax(owner, item, evt)

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">{

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> var first=document.getElementById("txtfirst");

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> AjaxMethod.GetNIVNumber(first.value,callback_GetNIVNumber);

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> }

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> function callback_GetNIVNumber(res)

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">{

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> var obj=document.getElementById("txtsecond");

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> obj.value=res.value;

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> }

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> </script>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> </HEAD>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <body MS_POSITIONING="GridLayout">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <form id="Form1" method="post" runat="server">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <INPUT style="Z-INDEX: 101; LEFT: 208px; POSITION: absolute; TOP: 40px" type="button" value="Button"

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> onclick="testAjax();">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <html" class="wordstyle">asp:TextBox id="txtfirst" style="Z-INDEX: 102; LEFT: 40px; POSITION: absolute; TOP: 40px" runat="server"></html" class="wordstyle">asp:TextBox>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> <html" class="wordstyle">asp:TextBox id="txtsecond" style="Z-INDEX: 103; LEFT: 40px; POSITION: absolute; TOP: 72px" runat="server"></html" class="wordstyle">asp:TextBox>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> </form>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> </body>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"></HTML>

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">protected System.Web.UI.WebControls.TextBox txtfirst;

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">protected System.Web.UI.WebControls.TextBox txtsecond;

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">private void Page_Load(object sender, System.EventArgs e)

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">{

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> //注册,其中Document.Pages.AjaxTest.AjaxMethod为AjaxMethod.cs方法所在的命名空间

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)"> Ajax.Utility.RegisterTypeForAjax(typeof(Document.Pages.AjaxTest.AjaxMethod));

javascript:window.open(this.src);" style="CURSOR: pointer" onload="return imgzoom(this,550)">}

然后运行就可以了，

现效果：在第一个textbox中输入内容，点击button，就把内容显示到第二textbox中。这只是一个简单的示例，还可以修改调用方法，从数据库读取以及更复杂的操作

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