我的JSP页面中有两个表单，应该由两个嵌入式JS脚本验证（参见下面的代码）。问题是脚本无法正常工作，省略了验证第一个条目（分别是username和loginName）。我有两个外部Javascript文件来进行验证，但是有类似的问题。
<!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，我需要一些帮助来解决为什么两个单独的表单和验证脚本无法按预期工作的原因。 （我有其他JSP页面，其中包含单个外部Javascript验证脚本，它们都按预期工作）。 有人可以提出解决方案吗？
答案 0 :(得分：1)
答案是从每个表单中删除隐藏的输入，例如
<input type="hidden" name="username" value="" />
和
<input type="hidden" name="loginName" value="" />
所以表格看起来像这样：
<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>
和此：
<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>
简而言之，Javascript没有任何问题。