无刷新判断用户名是否存在
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无刷新判断用户名是否存在
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兩個頁面：
Default.aspx? 輸入username去驗證
checkUser.aspx 處理驗證信息
?
Default頁面代碼
?
Code<!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>無刷新判斷用戶名是否存在</title>
????<script?type="text/javascript"?language="javascript">
????var?xmlHttp=null;
????function?CheckUser()
????{
????try
????{
????????xmlHttp=new?ActiveXObject("Msxml2.XMLHTTP");
????}
????catch(err1)
????{
????????try
????????{
????????xmlHttp?=new?ActiveXObject("Microsoft.XMLHTTP");
????????}
????????catch(err2)
????????{
????????xmlHttp?=new?XMLHttpRequest();
????????}
????}
????var?Text1=document.getElementById("Text1");
????var?url="checkUser.aspx?userid="+Text1?.value;
????xmlHttp.open("GET",url,true);
????xmlHttp.onreadystatechange=OnHandler;
????xmlHttp.send(null);
????
????}
????
????
????function?OnHandler()
????{
????????if?(xmlHttp.readyState==4)
????????{
????????var?isValid=xmlHttp.responseText;
????????var?exists=document.getElementById("exsits");
????????exists.innerHTML=isValid.substring(0,4);
????????}
????}
????</script>
</head>
<body>
????<form?id="form1"?runat="server">
????<div>
????Only?when?the?input?text?is?"zhangkai"?there?will?be?exist.<br?/>
????????<input?id="Text1"?type="text"?onblur="CheckUser()"?/>
????????
????????<label?id="exsits"?style="color:Red;?font-size:10px;"></label><br?/>
????????<button??value="asd"?visible="true"?type="button"?onclick="CheckUser()">Validate</button>
????</div>
???
????</form>
</body>
</html>
?
?
CheckUser頁面代碼
?
Code????????if?(!Page.IsPostBack)
????????{
????????????if?(Request.QueryString["userid"]?!=?null)
????????????{
????????????????string?getUserID?=?string.Empty;
????????????????getUserID?=?Request.QueryString["userid"].ToString();
????????????????if?(getUserID.Equals("zhangkai"))
????????????????{
????????????????????Response.Write("存在");
????????????????}
????????????????else
????????????????{
????????????????????Response.Write("不存在");
????????????????}
????????????}
????????}
?
?
?關于 ActiveXObject函數請見上篇文章 ActiveXObject函數【轉】
轉載于:https://www.cnblogs.com/beyond0309/archive/2009/11/02/1594876.html
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