提交后如何留在页面

Question

发送表单后如何才能保持同一页面？ 我目前只在JS中收到此消息，并转发给handler.php页面。

    echo "<script> alert ('Vielen Dank für Ihre Anfragen, wie werden Sie so rasch wie möglich kontaktieren!'); </script>";

这是我的html表单：

        <!-- Start Contact Form -->
    <div class="triangle"></div>
    <div id="cform" class="container">
        <div class="row">
            <h3 class="my-title contact-title">Kontaktformular</h3>
            <hr>
            <div class="col-md-12">
                <form id="my-form" method="post" action="handler.php">
                    <ul class="contact-form">
                        <li>
                            <div class="col-md-6">
                                <input name="name" placeholder="Name" required="required" size="8" type="text">
                            </div>

                            <div class="col-md-6">
                                <input name="email" placeholder="E-Mail" required="required" size="8" type="email">
                            </div>
                        </li>

                        <li>
                            <div class="col-md-6">
                                <input name="telefon" placeholder="Telefon" size="8" type="text">
                            </div>

                            <div class="col-md-6">
                                <input name="firma" placeholder="Firma" size="8" type="text">
                            </div>
                        </li>

                        <li>
                            <div class="col-md-6">
                                <label>Ihr Budget</label>
                                <div id="slider-range-min" class="ui-slider ui-slider-horizontal ui-widget ui-widget-content ui-corner-all">
                                    <div class="ui-slider-range ui-widget-header ui-corner-all ui-slider-range-min" style="width: 1%;">
                                        </div><span class="ui-slider-handle ui-state-default ui-corner-all" tabindex="0" style="left: 8%;"></span></div>
                            </div>
                            <div class="col-md-6">
                                <input name="amount" id="amount" readonly>
                            </div>
                        </li>

                        <li>

                            <div class="col-md-12">
                                <textarea class="span12" name="details" placeholder="Ihre Projektbeschreibung" required="required"></textarea>
                            </div>
                        </li>

                        <li>
                            <div class="col-md-12">
                                <button id="my-btn" type="submit">Senden <span class="glyphicon glyphicon-arrow-right" aria-hidden="true"></span></button>
                                <span id="status"></span>
                            </div>
                        </li>
                        <div id="msgSubmit" class="h3 text-center hidden"></div>


                    </ul>
                </form>
            </div>

        </div>
    </div>

    <!-- End Contact Form -->

这是我的php代码

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<?php
if(isset($_POST['email'])) {
 
    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "mail@info.com";
    $email_subject = "Your email subject line";
 
    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
 
 
    // validation expected data exists
    if(!isset($_POST['name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telefon']) ||
        !isset($_POST['firma']) ||
        !isset($_POST['amount']) ||
        !isset($_POST['details'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
 
     
 
    $first_name = $_POST['name']; // required
    $email_from = $_POST['email']; // required
    $firma = $_POST['firma']; // required
    $telephone = $_POST['telefon']; // not required
    $amount = $_POST['amount'];
    $comments = $_POST['details']; // required
 
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
 
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
 
    $string_exp = "/^[A-Za-z .'-]+$/";
 
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
 
  if(!preg_match($string_exp,$firma)) {
    $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }
 
  if(strlen($comments) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
 
  if(strlen($error_message) > 0) {
    died($error_message);
  }
 
    $email_message = "Form details below.\n\n";
 
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
 
     
 
    $email_message .= "First Name: ".clean_string($first_name)."\n";
  
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telephone: ".clean_string($telephone)."\n";
    $email_message .= "Firma: ".clean_string($firma)."\n";
    $email_message .= "Amount: ".clean_string($amount)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";
 
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
 
}

?>
 
<!-- include your own success html here -->
 

 <?php
 	echo "<script> alert ('Vielen Dank für Ihre Anfragen, wie werden Sie so rasch wie möglich kontaktieren!'); </script>";
 ?>
 
 
 

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对不起，但是我不得不像这样放一个php代码狙击手，谢谢大家的帮助