提交后保留字段值

我需要此表单的操作来调用我的脚本，然后如果电子邮件地址已经在数据库中，它应该显示警报。提交后保留字段值

这个工程，但很明显，我被指向我的空白脚本页面，当我回到表单时，数据已经消失。

我希望被重定向到数据完整的窗体并显示警报。

我已经尝试了整天，让会议工作，现在我只是困惑。

如果有人能告诉我什么以及为每个页面添加会话代码的位置，我会非常感激。

本页面握住我的形式：

<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title>Untitled Document</title> 

    <script src='http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js'></script> 
    <script src='http://ajax.microsoft.com/ajax/jquery.validate/1.7/additional-methods.js'></script> 
    <script src='http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.js'></script> 

    <script src="../js/register_validate.js" type="text/javascript"></script> 

    <link href="../css/styles.css" rel="stylesheet" type="text/css"> 

    <base target="_top"> 
</head> 

<body> 

    <p><?php include ('register_form2.php') ?></p>      

</body> 
</html>

这是包含表单页面：

<form action="register_script2.php" method="POST" name="form_register" id="form_registerID" accept-charset="UTF-8"> 

    <aside class="field_reg_form"> 

    <input name="field_email1" type="text" required id="field_email1ID" /><br /><br /> 
    <input name="field_email2" type="text" required id="field_email2ID" /><br /><br /> 
    <input type="submit" value="submit" id="submit" name="submit" /> 

    </aside> 


</form>

下面是PHP脚本：

<?php 

require_once('../scripts/connect.php'); 

$con = mysqli_connect(DBHOST, DBUSER, DBPASS, DBNAME) or die('Could not connect to database server.'); 

if(isset($_POST['submit'])) { 

    $var_Email1 = mysqli_real_escape_string($con, $_POST['field_email1']); 
    $var_Email2 = mysqli_real_escape_string($con, $_POST['field_email2']); 

     if ($var_Email1 == $var_Email2){ 

      $sql = mysqli_query($con, "SELECT * FROM membership WHERE Email = '$var_Email1' "); 

       if(mysqli_num_rows($sql) > 0){ 
        print '<script type="text/javascript">'; 
        print 'alert("The email address '. $_POST['field_email1'].' is already in our database")'; 
        print '</script>'; 
         exit(); 
       } 

     echo "not in database"; 
    } 

} 
?>

来源

2014-11-03 Lori

是的，你可以实现（某种）在这种情况下，闪光灯会：

所以在提交：

<?php 

session_start(); // don't forget 
require_once('../scripts/connect.php'); 

$con = mysqli_connect(DBHOST, DBUSER, DBPASS, DBNAME) or die('Could not connect to database server.'); 

if(isset($_POST['submit'])) { 

    $var_Email1 = mysqli_real_escape_string($con, $_POST['field_email1']); 
    $var_Email2 = mysqli_real_escape_string($con, $_POST['field_email2']); 

    if ($var_Email1 == $var_Email2){ 

     $sql = mysqli_query($con, "SELECT * FROM membership WHERE Email = '$var_Email1' "); 
     if(mysqli_num_rows($sql) > 0){ 
      // set session 
      $_SESSION['email_exists'] = $var_Email1; 
      header('Location: the_starting_php.php'); 
      exit; 
     } 
    } 

    echo "not in database"; 

} 
?>

然后在表单页面中添加以下内容：

<?php 
session_start(); 

// check if there is 
$email = ''; 
if(isset($_SESSION['email_exists'])) { 
    $email = $_SESSION['email_exists']; 
    unset($_SESSION['email_exists']); // unset it 
    echo " 
     <script type='text/javascript'> 
     alert('The email address $email already exists'); 
     </script> 
    "; 
} 

?> 


<form action="register_script2.php" method="POST" name="form_register" id="form_registerID" accept-charset="UTF-8"> 

    <aside class="field_reg_form"> 
      <input name="field_email1" type="text" required id="field_email1ID" value="<?php echo $email; ?>" /> 
      <br /><br /> 
      <input name="field_email2" type="text" required id="field_email2ID" value="<?php echo $email; ?>" /> 
      <br /><br /> 
      <input type="submit" value="submit" id="submit" name="submit" /> 
    </aside> 

</form>

旁注：我建议使用预准备语句。

<?php 

session_start(); // don't forget 
require_once('../scripts/connect.php'); 

$con = mysqli_connect(DBHOST, DBUSER, DBPASS, DBNAME) or die('Could not connect to database server.'); 

if(isset($_POST['submit'])) { 

    $var_Email1 = $_POST['field_email1']; 
    $var_Email2 = $_POST['field_email2']; 

    if ($var_Email1 == $var_Email2){ 

     $sql = 'SELECT * FROM membership WHERE Email = ?'; 
     $select = $con->prepare($sql); 
     $select->bind_param('s', $var_Email1); 
     $select->execute(); 
     if($select->num_rows > 0){ 
      // set session 
      $_SESSION['email_exists'] = $var_Email1; 
      header('Location: the_starting_php.php'); 
      exit; 
     } 
    } 

    echo "not in database"; 

} 
?>

来源

2014-11-03 00:58:18 Ghost

非常好！这正是我需要的。非常感谢！！ – Lori 2014-11-03 01:26:15

@Lori很高兴这有帮助 – Ghost 2014-11-03 01:28:12

您可以使用ajax发送数据，然后显示您的php脚本的回报，如下所示：

$.ajax({ 
    type: 'POST', 
    url: 'register_script2.php', 
    data: $('form#form_register').serialize() 
}) 
.done(function(msg) { 
     if(msg != 'error'){ 
      alert('The email address '+msg+' is already in our database'); 
     } else { 
      // init your form 
     } 
});

在你的PHP代码中这样做;

... 

if(mysqli_num_rows($sql) > 0){ 
    echo $var_Email1; 
} else { 
    echo 'error'; 
} 

...

来源

2014-11-03 00:35:50 akmozo

您应该进一步扩展以使其成为正确的答案，因为它目前只是一条评论。 – Darren 2014-11-03 00:36:52

谢谢，但我需要使用会话。 – Lori 2014-11-03 00:41:15

这是一个选择，或者你没有告诉我们所有的东西！因为我没有看到这种情况下的兴趣！ – akmozo 2014-11-03 00:55:25

我知道你发布的代码，但我仍然;不确定工作流程。但是，我会给你一个“例如”，看看你是否至少可以用这个想法来运行。

鉴于你的形式，还提供value属性和从$_POST值拉他们：

register_form.php

<!-- keeping it brief... --> 
<form method="POST"> 
    <input type="email" name="email1" value="<?= $_POST['email1']; ?>" /> 
    <input type="email" name="email2" value="<?= $_POST['email2']; ?>" /> 
    <input type="submit" value /> 
</form>

然后在原来的要求，其输出：

<!-- ... --> 
<?php include('register_form.php'); ?> 
<!-- ... -->

然后，在您提交的页面中也调用它（这次它“会被传入值预填）：

<!-- ... --> 
<?php if (isset($_POST['submit'])) { ... } ?> 
<!-- ... --> 
<?php include('register_form.php'); ?> 
<!-- ... -->

来源

2014-11-03 00:43:40

提交后保留字段值

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