【发布时间】：2014-11-09 13:08:35
【问题描述】：
我正在开发一个使用表单的 php 电子邮件程序，该表单需要重定向到我无权访问以添加代码的“谢谢”页面。用户输入通过一些简单的 preg_match 函数发送，以确保它匹配必要的格式。如果其中一项功能失败，则会回显一个 javascript 弹出窗口，让用户知道他们需要更改什么。如果成功，数据将存储在 SESSION 变量中，并传递到页面，在该页面中将数据添加到必要的 html 中，并作为简单的 html 电子邮件发送。然后 process.php 页面重定向到 results.php 清除会话，并将用户带到“谢谢”页面。
我的问题是，当用户输入错误数据然后更正并提交时，在到达“谢谢”页面后按下“返回”按钮会让我在返回之前获得这些“确认表单重新提交”页面之一表格。一旦它在第二次点击“返回”后真正返回到表单，旧的、坏的数据就会在表单中代替好数据。我想修复它，使“确认表单重新提交”页面永远不会出现，如果用户只点击一次后退按钮，他们就会返回到空白表单。我的html：
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post">
<table id="form_table" style="280px; border:0px; padding: 0 0 5px 0; border-spacing: 0px;">
<tr>
<td>
<span style="font-size: 12px;">*First name</span>
</td>
</tr>
<tr>
<td>
<input style="padding: 5px; font-size: 12px;" name="firstName" type="text" size="50" value="<?php if(isset($_POST['firstName'])) { echo htmlentities($_POST['firstName']); }?>" />
</td>
</tr>
<tr>
<td style="padding-top: 7px;">
<span style="font-size: 12px;">*Last name</span>
</td>
</tr>
<tr>
<td>
<input style="padding: 5px; font-size: 12px;" name="lastName" type="text" size="50" value="<?php if(isset($_POST['lastName'])) { echo htmlentities($_POST['lastName']); }?>" />
</td>
</tr>
<tr>
<td style="padding-top: 7px;">
<span style="font-size: 12px;">*Email</span>
</td>
</tr>
<tr>
<td>
<input style="padding: 5px; font-size: 12px;" name="emailAddy" type="text" size="50" value="<?php if(isset($_POST['emailAddy'])) { echo htmlentities($_POST['emailAddy']); }?>" />
</td>
</tr>
<tr>
<td style="padding-top: 7px;">
<span style="font-size: 12px;">Phone number</span>
</td>
</tr>
<tr>
<td>
<input style="padding: 5px; font-size: 12px;" name="phoneNumber" type="text" size="50" value="<?php if(isset($_POST['phoneNumber'])) { echo htmlentities($_POST['phoneNumber']); }?>" />
</td>
</tr>
<tr>
<td style="padding-top: 15px;">
<span style="font-size: 12px;">Tell us how we can help</span>
</td>
</tr>
<tr>
<td>
<input style="padding: 5px 5px 15px 5px; font-size: 12px;" name="howHelp" type="text" size="50" value="<?php if(isset($_POST['howHelp'])) { echo htmlentities($_POST['howHelp']); } ?>" />
</td>
</tr>
</table>
<div style="width: inherit;">
<input type="image" id="saveform" src="http://www.fivemm.com/client/tristar/images/consult-btn.jpg" alt="Submit Question!" style="width: 100%; height: 96px; border: none;" />
</div>
<?php echo $msg_to_user ?>
</form>
处理代码，位于同一页面底部：
<?php
if(isset($_POST['firstName'])) {
function died($error) {
$error = 'So sorry, but it looks like there are some issues with your form.\\n\\n'.$error;
echo '<script type="text/javascript"> alert("'.$error.'")</script>';
die();
}
$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
$string_exp = "/^[A-Za-z .'-]+$/";
$msg_exp = "/^$|^[A-Za-z ?!.'-:]+$/";
if(!preg_match($string_exp,$_POST['firstName'])) {
$error_message .= 'The first name you entered contains invalid characters or is blank.\\n\\n';
}
if(!preg_match($string_exp,$_POST['lastName']) && strlen($_POST['lastName']) > 0) {
$error_message .= 'The last name you entered contains invalid characters.\\n\\n';
}
if(!preg_match($email_exp,$_POST['emailAddy'])) {
$error_message .= 'The email address you entered does not appear to be valid or is blank.\\n\\n';
}
if(strlen($error_message) > 0) {
died($error_message);
}
function clean_string($string) {
$bad = array("content-type","bcc:","to:","cc:","href");
return str_replace($bad,"",$string);
}
$_SESSION['firstName'] = $_POST['firstName']; // required
$_SESSION['lastName'] = $_POST['lastName']; // required
$_SESSION['emailAddy'] = $_POST['emailAddy']; // required
$_SESSION['phoneNumber'] = htmlspecialchars(clean_string($_POST['phoneNumber'])); // required
$_SESSION['howHelp'] = clean_string($_POST['howHelp']);
echo ("<SCRIPT LANGUAGE='JavaScript'>window.location.href='process.php';</SCRIPT>");
}
?>
process.php 页面：
<?php
session_start();
if(isset($_SESSION['firstName']) && isset($_SESSION['page1'])) {
$_SESSION['page2']="2";
$first_name = $_SESSION['firstName'];
$last_name = $_SESSION['lastName'];
$email_addy = $_SESSION['emailAddy'];
$phone_number = $_SESSION['phoneNumber'];
$how_help = $_SESSION['howHelp'];
// EDIT THESE 2 LINES BELOW AS REQUIRED
$email_to = 'someguy@domainname.com'; // use for testing
$email_subject = "This Guy Wants To Contact You!"; // Enter intended message here
$email_message = '<html>';
$email_message .= '<head>';
$email_message .= '</head>';
$email_message .= '<body>';
$email_message .= '<h3>You have a new email message!</h3>';
$email_message .= '<table>';
$email_message .= '<tr><td>Name</td><td>'.$first_name.' '.$last_name.'</td></tr>';
$email_message .= '<tr><td>Email Address</td><td>'.$email_addy.'</td></tr>';
$email_message .= '<tr><td>Phone Number</td><td>'.$phone_number.'</td></tr>';
$email_message .= '<tr><td>How can we help?</td><td>'.$how_help.'</td></tr>';
$email_message .= '</table>';
$email_message .= '</body>';
$email_message .= '</html>';
// create email headers
$headers = "From: ".$first_name." \r\n";
$headers .= "Bcc: otherguy@otherdomain.com, otherdude@yetanotherdomain.com\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
$headers .= "\r\n";
// $headers .= 'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);
header('Location: results.php');
}
?>
最后是 results.php 页面：
<?php
session_start();
if (isset($_SESSION['page2']))
{
session_destroy();
header('Location: http://www.domainname.com/thank-you/');
}
else
{
header('Location: index.php');
}
?>
【问题讨论】：
-
你可以试试： if ( window.history.replaceState ) { window.history.replaceState( null, null, window.location.href ); } 在您正在弹出的页面顶部
标签： javascript php html forms