Ajax自动印证用户是否存在
日期：2014-05-16 浏览次数：20697 次
Ajax自动验证用户是否存在
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
var XmlHttpRequest;
function createXMLHttpRequest(){
if(window.ActiveXObject){
XmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");
}else{
XmlHttpRequest=new XMLHttpRequest();
}
}
function checkName(uname){
createXMLHttpRequest();
XmlHttpRequest.open("post","CheckUserServlet","true");
XmlHttpRequest.onreadystatechange=callback;
XmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
XmlHttpRequest.send("uname="+uname.value);
}
function callback(){
if(XmlHttpRequest.readyState==4&&XmlHttpRequest.status==200){
var bl=XmlHttpRequest.responseText;
if(bl=="true"){
document.getElementById("id1").innerHTML="<font color=red>用户名不能使用</font>";
}else{
document.getElementById("id1").innerHTML="";
}
}
}
</script>
</head>
<body>
<form action="CheckUserServlet" method="post">
用户名：<input type="text" name="uname" onblur="checkName(this)"><div id="id1" style="display:inline"></div><br/>
密码：<input type="password" name="pwd">
<input type="submit">
</form>
</body>
</html>
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