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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="LogIn.aspx.cs" Inherits="LogIn" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <script src="Script/jquery-1.7.1.min.js"></script> <script type="text/javascript"> function myXMLHttpRequest() { //创建AJAX对象，不同浏览器创建方法不同，在这简写了 var xmlhttp; if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); } else { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } //AJAX对象状态发生改变时触发 xmlhttp.onreadystatechange = function () { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { //responseText 响应返回类型为Text时，用这个属性接收 //修改相应标签的属性 document.getElementById("sp").innerHTML = xmlhttp.responseText; } } var url = "/AJAX练习/xiangying.aspx?username=" + $("#txt").val(); //发出请求 //第一个参数GET/POST方式 //第二个参数请求页面的地址 //第三个参数是否使用异步机制，true xmlhttp.open("GET", url, true); xmlhttp.send(); } </script> </head> <body> <form id="form1" runat="server"> <div> <table> <tr> <td> 用户名： </td> <td> <input id="txt" type="text" onkeyup="myXMLHttpRequest()" /> </td> <td> </td> <td> <span id="sp"></span> </td> </tr> <tr> <td> 密码： </td> <td> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> </td> </tr> </table> </div> </form> </body> </html>
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class xiangying : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //接收请求 string userna = Request["username"].ToString(); //响应请求 if (userna=="abc") { Response.Write("可以"); } else { Response.Write("不可以"); } } }
以下是用JQuery写的 返回类型是XML格式
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <script src="Js/jquery-1.11.2.js" type="text/javascript" ></script> <script> $(document).ready( function () { $("#txtUid").blur( function () { var txt = $(this).val(); //ajax发送文本信息出去 $.ajax({ url:"Default2.aspx",//接收请求的页面 type: "POST",//请求发送方式 data: { uid: txt },//数据 datatype: "XML",//接收回送的信息格式设定 success: function (data) {//回调函数 var c = $(data).text(); $("#Literal1").html("用户名可用"); } }); } ); } ); </script> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="txtUid" runat="server"></asp:TextBox> <div id="Literal1"></div> <br /> </div> </form> </body> </html>
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class Default2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string uid = Request["uid"].ToString(); Response.Write("<?xml version=‘1.0‘?>"); Response.Write("<count id=‘count‘>OK</count>"); Response.End(); } }
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原文地址：http://www.cnblogs.com/happinesshappy/p/4698558.html
