JSP页面表单验证:2个表单和2个脚本
JSP页面表单验证:2个表单和2个脚本
提问于 2017-04-03 10:55:15
我的JSP页面中有两个表单，应该由两个嵌入式JS脚本进行验证(参见下面的代码)。问题是脚本不能正常工作，并且忽略了第一个条目(用户名和loginName )的验证。我有两个外部Javascript文件来进行验证，但也有类似的问题。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Scotia Login Page</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></meta>
<!-- <script type="text/javascript" src="scripts/stafflogin.js"></script> -->
<!--<script type="text/javascript" src="scripts/userlogin.js"></script> -->
<link rel="stylesheet" type="text/css" href="styles/DWBA.css"/>
</head>
<body>
<div class="outer">
<div class="header"><h1>Scotia Island & Wildlife Cruises</h1></div>
<div class="box"><h2>Login Page</h2>
<script>
function validateform1() {
var username = document.stafflogin.username.value;
var password = document.stafflogin.password.value;
if (username === null || username === "") {
alert("Please enter the admin username");
document.stafflogin.username.focus();
return false;
} else if (password === null || password === "") {
alert("Please enter the admin password");
document.stafflogin.password.focus();
return false;
}
}
</script>
<form name="stafflogin" action="CustomerServlet" onsubmit="return validateform1()"><!-- -->
<h3>Staff Login with username and password</h3>
<p> To login, enter details below:</p>
<table cellspacing="8" border="0">
<tr>
<td align="left"><p>Staff Username:</p></td><!-- USERNAME is admin -->
<td><input type="text" name="username" id="username" /></td>
</tr>
<tr>
<td align="left"><p>Staff Password:</p></td><!-- PASSWORD is admin -->
<td><input type="password" name="password" id="password" /></td>
</tr>
<tr>
<td align="left"><input type="submit" value="stafflogin" name="submit" style="width:75px" /></td>
<td><br /><input type="hidden" name="username" value="" /></td>
</tr>
</table>
</form>
<br />
<script>
function validateform2() {
var name = document.userlogin.loginName.value;
var password = document.userlogin.loginPasswd.value;
if (name === null || name === "") {
alert("Please enter your username");
document.userlogin.loginName.focus();
return false;
} else if (password === null || password === "") {
alert("Please enter your password");
document.userlogin.loginPasswd.focus();
return false;
}
}
</script>
<form name="userlogin" method="POST" action="LoginServlet" onsubmit="return validateform2()">
<h3>Customer Login with login name and login password</h3>
<p> To login, enter details below:</p>
<table cellspacing="8" border="0">
<tr>
<td align="left"><p>Login name:</p></td><!-- -->
<td><input type="text" name="loginName" id="loginName"/></td>
</tr>
<tr>
<td align="left"><p>Login password:</p></td><!-- -->
<td><input type="password" name="loginPasswd" id="loginPasswd"/></td>
</tr>
<tr>
<td align="left"><input type="submit" value="userlogin" name="submit" style="width:75px" /><br /></td>
<td><input type="hidden" name="loginName" value="" /></td>
</tr>
</table>
</form>
<br />
<form name="Form" action="CustomerServlet">
<h3>New Customer registration</h3>
<p>To register, click on "register" below:</p>
<table cellspacing="8" border="0">
<tr>
<td><input type="submit" value="register" name="submit" style="width:75px" /></td>
</tr>
</table>
</form>
</div>
<div class="footer"><div align="center"><!-- ALIGNS EVERYTHING WITHIN DIV -->
<p>© Copyright Scotia Island & Wildlife Cruises, Harbour Road, Morar, Invernessshire.</p>
<form>
<tr>
<td><input type="submit" value="home" name="submit" style="width:75px" /></td>
</tr><br />
</form></div>
</div><br />
</div>
</body>
</html>由于我是Javascript的新手，我需要一些帮助来理解为什么两个单独的表单和验证脚本不能像预期的那样工作。(我有其他带有单个外部Javascript验证脚本的JSP页面，它们都按预期工作)。有人能提出解决办法吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-04-07 19:14:49
答案是从每个表单中删除隐藏的输入。
<input type="hidden" name="username" value="" />和
<input type="hidden" name="loginName" value="" />表格看起来是这样的：
<script type='text/javascript'>
function validateform1() {
'use strict';
var username = document.stafflogin.username.value;
var password = document.stafflogin.password.value;
if (username === null || username === "") {
alert("Please enter the admin username");
document.stafflogin.username.focus();
return false;
} else if (password === null || password === "") {
alert("Please enter the admin password");
document.stafflogin.password.focus();
return false;
} else {
document.stafflogin.submit();
}
}
</script>
<form name="stafflogin" action="CustomerServlet" onsubmit="return validateform1()">
<h3>Staff Login with username and password</h3>
<p> To login, enter details below:</p>
<table cellspacing="8" border="0">
<tr>
<td align="left"><p>Staff Username:</p></td>
<td><input type="text" name="username" id="username" required /></td>
</tr>
<tr>
<td align="left"><p>Staff Password:</p></td>
<td><input type="password" name="password" id="password" /></td>
</tr>
<tr>
<td align="left"><input type="submit" value="stafflogin" name="submit" style="width:75px" /></td>
</tr>
</table>
</form>这是：
<script type='text/javascript'>
function validateform2() {
'use strict';
var name = document.userlogin.loginName.value;
var password = document.userlogin.loginPasswd.value;
if (name === null || name === "") {
alert("Please enter your username");
document.userlogin.loginName.focus();
return false;
} else if (password === null || password === "") {
alert("Please enter your password");
document.userlogin.loginPasswd.focus();
return false;
} else {
document.userlogin.submit();
}
}
</script>
<form name="userlogin" method="POST" action="LoginServlet" onsubmit="return validateform2()">
<h3>Customer Login with login name and login password</h3>
<p> To login, enter details below:</p>
<table cellspacing="8" border="0">
<tr>
<td align="left"><p>Login name:</p></td>
<td><input type="text" name="loginName" id="loginName"/></td>
</tr>
<tr>
<td align="left"><p>Login password:</p></td>
<td><input type="password" name="loginPasswd" id="loginPasswd"/></td>
</tr>
<tr>
<td align="left"><input type="submit" value="userlogin" name="submit" style="width:75px" /><br /></td>
</tr>
</table>
</form>总之，Javascript没有什么问题。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/43182775
复制相关文章
相似问题
腾讯云开发者
Copyright © 2013 - 2026 Tencent Cloud. All Rights Reserved. 腾讯云 版权所有
深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 
粤公网安备44030502008569号
腾讯云计算（北京）有限责任公司 京ICP证150476号 | 京ICP备11018762号