操作：頁面(CheckName.aspx)輸入使用者名---->點選Check按鈕---->經由背景驗證(Check.aspx.cs)---->傳回驗證資訊
CheckName.aspx頁面代碼
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CheckName.aspx.cs" Inherits="JSTest.CheckName" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function(){
var userNameVal = $("#txtUserName");
$("#btnCheckUserName").click(function(){
var userName = userNameVal.val();
if(userName==""){
alert("使用者名不允許為空！");
}else{
$("#img").show();
$.get("Check.aspx?userName="+userName,null,function(response){
$("#msg").html(response);
$("#img").hide();
});
}
});
userNameVal.keyup(function(){
var value = userNameVal.val();
$("#msg").html(" ");
if(value==""){
userNameVal.addClass("userText");
}else{
$(this).removeClass("userText");
}
});
});
</script>
<style type="text/css">
.userText{
border:1px solid red;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<table >
<tr>
<th>标題</th>
<th>内容</th>
<th>按鈕</th>
</tr>
<tr>
<td><label for="txtUserName">使用者名</label></td>
<td><input id="txtUserName" type="text" class="userText" /></td>
<td><input id="btnCheckUserName" type="button" value="Check" /></td>
</tr>
</table>
<div id="msg"></div>
<div id="img" style="display:none"><img title="" alt="" src="img/ggg.gif" /></div>
</form>
</body>
</html>
Check.aspx.cs代碼
protected void Page_Load(object sender, EventArgs e)
{
string userName = Request.QueryString["userName"].ToString();
if (userName == "綠樹臨風之丘")
{
Thread.Sleep(3000);//延遲一下
Response.Write("使用者名已存在！");
}
else
{
Thread.Sleep(3000);
Response.Write("此使用者名還未被注冊！");
}
}
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