如果您有任何意见,请留下您宝贵的意见以便告知 操作环境:Visual Studio.Net2003操作系统:window Xp SP2
就上次分析的简易Ajax框架一篇没能给你带来什么，只能告诉你，或者是对Ajax的进一步理解，现在用那个框架实现简单的加减乘除运算，希望能给你带来点什么
显示的页面：
Calculate.aspx
<%@ Page language="c#" Codebehind="Calculate.aspx.cs" AutoEventWireup="false" Inherits="AjaxFrmClass.Calculate.Calculate" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML> <HEAD> <title>Calculate</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="jscript" src="../Javascript/CallBackObject.js"></script> <script language="jscript"> function DoCalculate() { var f = document.Form1; if((f.num1.value !="") && (f.num2.value!= "" )) { var cbo = new CallBackObject(); cbo.OnComplete = Cbo_Complete; cbo.onError = Cbo_Error; cbo.DoCallBack("Ajax.aspx?num1="+f.num1.value+"&num2="+f.num2.value+"&drpSelect="+ f.drpSelect.value); } else if(f.num1.value == "" ) { document.getElementById("lblMessage").innerHTML = "第一个数不能为空!" ; } else if(f.num2.value == "" ) { document.getElementById("lblMessage").innerHTML = "第二个数不能为空!" ; } } function Cbo_Complete(responseText, responseXML) { alert(responseText); } function Cbo_Error() { alert(responseText); } </script> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <TABLE id="Table1" style="Z-INDEX: 105; LEFT: 224px; WIDTH: 192px; POSITION: absolute; TOP: 216px; HEIGHT: 80px" cellSpacing ="1" cellPadding="1" width="192" border="1"> <TR> <TD bgcolor="#ff9933" style="WIDTH: 44px; HEIGHT: 7px" colSpan="4"> <DIV style="DISPLAY: inline; WIDTH: 224px; HEIGHT: 18px" ms_positioning="FlowLayout">基于Ajax的简单计算</DIV> </TD> </TR> <TR> <TD style="WIDTH: 56px; HEIGHT: 24px"> <INPUT id="num1" style="WIDTH: 59px; HEIGHT: 22px" type="text" size="4"></TD> <TD style="WIDTH: 46px; HEIGHT: 24px"> <SELECT id="drpSelect" style="WIDTH: 50px"> <OPTION value="jia" selected>+</OPTION> <OPTION value="jian">-</OPTION> <OPTION value="cheng">*</OPTION> <OPTION value="chu">/</OPTION> </SELECT> </TD> <TD style="WIDTH: 50px; HEIGHT: 24px"> <INPUT id="num2" style="WIDTH: 48px; HEIGHT: 22px" type="text" size="2"></TD> <TD style="HEIGHT: 24px"> <INPUT id="btnCalculate" type="button" onclick="DoCalculate()" value="计算"></TD> </TR> <TR> <TD style="WIDTH: 56px" colSpan="4"> <DIV id="lblMessage" style="DISPLAY: inline; WIDTH: 224px; HEIGHT: 16px" ms_positioning="FlowLayout"></DIV> </TD> </TR> </TABLE> </form> </body> </HTML>
Calculate.aspx .cs里面不需要做处理，因为我们要的是客户端的异步回掉
解释下：<script language="jscript" src="../Javascript/CallBackObject.js"></script> 这里指代的CallBackObject.js就是另篇文章简易Ajax框架，你可以讲代码Copy出来就可以了
以上是客户端，Ajax已经发送请求到服务器端了，下面看看服务器端的处理过程
Ajax.aspx.cs
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;namespace AjaxFrmClass.Calculate{ /// <summary> /// Ajax 的摘要说明。 /// </summary> public class Ajax : System.Web.UI.Page { private void Page_Load(object sender, System.EventArgs e) { string number1 = HttpContext.Current.Request.QueryString["num1" ]; string number2 = HttpContext.Current.Request.QueryString["num2" ]; string fuhao = HttpContext.Current.Request.QueryString["drpSelect" ]; int i = 0 ; int j = 0 ; bool status = true ; if(number1 != null ) { try { i = int .Parse(number1); } catch (Exception errExce) { Response.Write(errExce.Message); } } if(number2 != null ) { try { j = int .Parse(number2); } catch (Exception errExce1) { Response.Write(errExce1.Message); } } if (status) { switch (fuhao) { case "jia" : Response.Write(i+ j); break ; case "jian" : Response.Write(i- j); break ; case "cheng" : Response.Write(i* j); break ; default : Response.Write(i/ j); break ; } Response.End(); } } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base .OnInit(e); } /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this .Page_Load); } #endregion }}
同样，Ajax.aspx客户端中也不要做任何的处理，因为请求传到了服务器端，只要在服务器端做处理就行了
做到这步，如果你是按照我的步骤往下走的，Ctrl + F5 你就成功了，假如还有错你得好好检查，面对脚本错误不用着急，一些基本的错误还是会看出来的
