📄 index.jsp
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<%@ page language="java" pageEncoding="UTF-8"%>
<html>
<head>
<title>
注册
</title>
<script type="text/javascript">
var req;
function UserNameCheck()
{
var username = document.getElementById('username').value;
var url = "pre?user_name=" + escape(username);
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET", url, true);
req.onreadystatechange = callback;
req.send(null);
}
}
function callback() {
if (req.readyState == 4) {
if (req.status == 200) {
parseMessage();
// update the HTML DOM based on whether or not message is valid
}else{
alert ("Not able to retrieve description" + req.statusText);
}
}
else
{
document.getElementById("check_username").innerHTML = "正在验证用户名....";
}
}
function parseMessage() {
var xmlDoc = req.responseXML.documentElement;
var node = xmlDoc.getElementsByTagName('info');
document.getElementById('check_username').innerHTML = node[0].firstChild.nodeValue;
}
function Form_Submit()
{
if(regForm.username.value=="")
{
alert("用户名不能为空!");
return false;
}
else if(regForm.password.value=="")
{
alert("密码不能为空!");
return false;
}
else if(regForm.password.value!=regForm.repassword.value)
{
alert("两次输入的密码不一致!");
return false;
}
regForm.submit();
}
</script>
</head>
<body>
<div align="center">
<form name="regForm" method="post" action="/dynareg/regservlet">
<table width="70%" border="1">
<tr align="center">
<td colspan="2">
用户注册
</td>
</tr>
<tr>
<td width="24%" align="center">
用户名:
</td>
<td width="76%">
<input name="username" type="text" id="username" onBlur="UserNameCheck()">
<span id="check_username"></span>
</td>
</tr>
<tr>
<td align="center">
密码:
</td>
<td>
<input name="password" type="password" id="password">
</td>
</tr>
<tr>
<td align="center">
重复密码:
</td>
<td>
<input name="repassword" type="password" id="repassword">
</td>
</tr>
<tr>
<td align="center">
email:
</td>
<td>
<input name="email" type="text" id="email">
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="button" name="Submit" value="按钮" onClick="Form_Submit()">
</td>
</tr>
</table>
</form>
</div>
</body>
</html>
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