我正在按照教程进行登录系统，但不幸的是，事情对我不起作用。当我尝试登录时，我总是被重定向到登录表单，而不是我希望的k_panel.php！我已经用教程中提供的代码检查了一万亿次，但仍然一无所获......
我把它火虫了，我得到了这个错误：
"document.logform.pass is undefined"，它指向验证代码的这一部分"if （ document.logform.pass.value == " ） { "。
这是什么意思？！我该怎么办？
我将在下面发布完整的代码，以便任何人都可以更好地了解：
<?php
if ($_POST['email']) {
//Connect to the database through our include
include_once "connect_to_mysql.php";
$email = stripslashes($_POST['email']);
$email = strip_tags($email);
$email = mysql_real_escape_string($email);
$password = ereg_replace("[^A-Za-z0-9]", "", $_POST['password']); // filter everything but numbers and letters
$password = md5($password);
// Make query and then register all database data that -
// cannot be changed by member into SESSION variables.
// Data that you want member to be able to change -
// should never be set into a SESSION variable.
$sql = mysql_query("SELECT * FROM members WHERE email='$email' AND password='$password' AND emailactivated='1'");
$login_check = mysql_num_rows($sql);
if($login_check > 0){
while($row = mysql_fetch_array($sql)){
// Get member ID into a session variable
$id = $row["id"];
session_register('id');
$_SESSION['id'] = $id;
// Get member username into a session variable
$username = $row["username"];
session_register('username');
$_SESSION['username'] = $username;
// Update last_log_date field for this member now
mysql_query("UPDATE members SET lastlogin=now() WHERE id='$id'");
// Print success message here if all went well then exit the script
header("location: k_panel.php?id=$id");
exit();
} // close while
} else {
// Print login failure message to the user and link them back to your login page
print '<br /><br /><font color="#fd0404", line-height:30px; vertical-align:middle; color:#fff; font-weight:bold;">Du finns inte i vårt system. Var vänlig och försök igen!</font><br />
<br /><a href="login.php">Klicka här</a> för att logga in.';
exit();
}
}// close if post
?>
<!DOCTYPE html>
<head>
<!-- Form Validation -->
<script type="text/javascript">
function validate_form ( ) {
valid = true;
if ( document.logform.email.value == "" ) {
alert ( "Var vänlig och skriv ditt användarnamn!" );
valid = false;
}
if ( document.logform.pass.value == "" ) {
alert ( "Var vänlig och skriv ditt lösenord!" );
valid = false;
}
return valid;
}
</script>
<!-- Form Validation -->
</head>
<body>
<form action="login.php" method="post" enctype="multipart/form-data" name="logform" id="logform" onsubmit="return validate_form ( );">
Skriv ditt e-post adress här:<br>
<input name="email" type="text" id="email" size="30" maxlength="64" class="user"/><br><br>
Skriv ditt lösenord här:<br>
<input name="password" type="password" id="password" size="30" maxlength="24" class="pass"/><br><br>
<input type="submit" name="submit" value="Login" class="login">
</form>
</body>
</html>
这是它应该进入的页面的代码（k_panel.php）：
这是我在页面上应该指向的代码：
<?php
session_start(); // Must start session first thing
// See if they are a logged in member by checking Session data
$toplinks = "";
if (isset($_SESSION['id'])) {
// Put stored session variables into local php variable
$username = $_SESSION['username'];
$toplinks = '<p style="background:#48c248; line-height:30px; vertical-align:middle; color:#fff; font-weight:bold;">Välkomen . $username . </a> | <a href="logout.php">Log Out</a></p>';
} else {
header("Location: login.php");
}
?>
是的，这将产生这种错误，因为您的表单中不存在"pass"类型的实体所以，这将给出未定义。"document.logform.pass is undefined "，它指向验证代码的这一部分"if （ document.logform.pass.value == " ） { "
如果您检查您使用的是名称"密码"而不是"通行证"。
更正这行代码，例如..
if ( document.logform.password.value == "" ) {
如果您仍有问题，请告诉我。
问候