PHP联系表单与Jquery验证无法正常工作

Problem is, whatever I tried did not work. Tried my own script, tried everything, then found some on google and tried them but no, don't know what's missing but, it doesn't work. The closest so far, I had empty emails. This is the latest version. Can anyone tell me what's missing ?

HTML

<div class="container-fluid">
                        <p id="returnmessage"></p>
                        <form action="sendEmail.php" id="contact_form" method="post">
                            <h2 style="font-size:14px;line-height:18px;font-weight:600;padding-bottom:0;">Bize Yazın</h2>
                            <ul class="contactform">
                                <li>
                                    <div id="name_error" class="error" style="color:#aa3939; font-size:8px; line-height:8px;"> <i class="fa fa-exclamation"></i> Lütfen adınızı giriniz.</div>
                                    <span class="contact-input-icon" style="text-align:left"><i class="fa fa-user"></i></span>
                                    <div class="input-field">
                                        <input type="text" style="border:1px solid rgba(220,220,220,0.5)" name="contactName" id="contactName" value="" class="required requiredField" placeholder="Ad Soyad"/>
                                    </div>
                                </li>
                                <li>
                                    <div id="email_error" class="error" style="color:#aa3939; font-size:8px; line-height:8px;"> <i class="fa fa-exclamation"></i> Lütfen eposta adresinizi giriniz.</div>
                                    <span class="contact-input-icon"><i class="fa fa-envelope"></i></span>
                                    <div class="input-field">
                                        <input type="email" style="border:1px solid rgba(220,220,220,0.5)" name="contactEmail" id="contactEmail" value="" class="required requiredField email" placeholder="Eposta"/>
                                    </div>
                                </li>
                                <li>
                                        <input type="text" style="border:1px solid rgba(220,220,220,0.5)" name="contactSubject" id="contactSubject" value="" class="hidden" placeholder=""/>
                                </li>
                                <li class="textarea">
                                    <div id="message_error" class="error" style="color:#aa3939; font-size:8px; line-height:8px;"> <i class="fa fa-exclamation"></i> Lütfen mesajınızı giriniz.</div>
                                    <span class="contact-input-icon"><i class="fa fa-pencil"></i></span>
                                    <div class="input-field">
                                        <textarea name="contactMessage" style="border:1px solid rgba(220,220,220,0.5)" id="contactMessage" rows="6" cols="20" class="required requiredField" placeholder="Mesajınız"></textarea>
                                    </div>
                                    <div id="mail_success" class="success" style="color:#00CC00"><i class="fa fa-check"></i> İlginiz için teşekkürler. En kısa sürede sizinle irtibata geçeceğiz.</div>
                                    <div id="mail_fail" class="error" style="color:#aa3939"><i class="fa fa-times"></i> Üzgünüz, mesajınız iletilemedi. Daha sonra lütfen tekrar deneyin.</div>
                                </li>
                                <li class="buttons">
                                    <div id="cf_submit_p">
                                    <input type="hidden" style="border:1px solid rgba(220,220,220,0.5)" name="submitted" id="submitted" value="true" />
                                    <button type="submit" style="border:1px solid #3f97cf" class="button" id="send_message"><i class="fa fa-paper-plane-o" style="font-size:20px;color:#3f97cf"></i></button>
                                    </div>
                                </li>
                            </ul>
                        </form>
                    </div> <!--end container-fluid-->
                </div><!-- #contact-canvas -->

JS validation

<script type="text/javascript">
    $(document).ready(function(){
        $('#send_message').on('submit',function(e){
            e.preventDefault();
            var error = false;
            var name = $('#contactName').val();
            var email = $('#contactEmail').val();
            var subject = $('#contactSubject').val();
            var message = $('#contactMessage').val();
            if(name.length == 0){
                var error = true;
                $('#name_error').fadeIn(500);
            } else {
                $('#name_error').fadeOut(500);
            }
            if(email.length == 0 || email.indexOf('@') == '-1'){
                error = true;
                $('#email_error').fadeIn(500);
            } else {
                $('#email_error').fadeOut(500);
            }
            if(message.length == 0){
                error = true;
                $('#message_error').fadeIn(500);
            } else {
                $('#message_error').fadeOut(500);
            } if(error == false){
                $('#cf_submit_p').attr({'disabled' : 'true', 'value' : 'Gönderiliyor...' });
                $.post("send_email.php", $("#contact_form").serialize(),function(result){
                    if(result == 'sent'){
                        $('#cf_submit_p').remove();
                        $('#mail_success').fadeIn(500);
                    } else {
                        $('#mail_fail').fadeIn(500);
                        $('#cf_submit_p').removeAttr('disabled').attr('value', 'Gönder');
                    }
                });
            }
            return false;
        });
    });
</script>

And PHP

<?php



//Değiştir. Site admini eposta adresi. 

$akaEmail = 'kreaft@outlook.com';





if($_POST) {



   $name = trim(stripslashes($_POST['contactName']));

   $email = trim(stripslashes($_POST['contactEmail']));

   $subject = trim(stripslashes($_POST['contactSubject']));

   $contact_message = trim(stripslashes($_POST['contactMessage']));



   // İsim doğrulama

    if (strlen($name) < 2) {

        $error['name'] = "Lütfen adınızı girin.";

    }

    // Email doğrulama

    if (!preg_match('/^[a-z0-9&\'\.\-_\+]+@[a-z0-9\-]+\.([a-z0-9\-]+\.)*+[a-z]{2}/is', $email)) {

        $error['email'] = "Lütfen geçerli bir eposta adresi girin.";

    }

    // Mesaj doğrulama

    if (strlen($contact_message) < 15) {

        $error['message'] = "Lütfen mesajınızı girin. (Min. 15 karakter)";

    }

   // Konu

    if ($subject == '') { $subject = "Site İletişim Formu"; }





   // Mesajı oluşturuyoruz

   $message .= "Gönd.: " . $name . "<br />";

   $message .= "Eposta: " . $email . "<br />";

   $message .= "Mesaj: <br />";

   $message .= $contact_message;

   $message .= "<br /> ----- <br /> Bu eposta site iletişim formu üzerinden gönderilmiştir. <br />";



   // Başlıkları oluşturuyoruz

   $from =  $name . " <" . $email . ">";



   // Başlıklar

    $headers = "From: " . $from . "
";

    $headers .= "Reply-To: ". $email . "
";

    $headers .= "MIME-Version: 1.0
";

    $headers .= "Content-Type: text/html; charset=ISO-8859-1
";





   if (!$error) {



      ini_set("sendmail_from", $akaEmail); // windows server için

      $mail = mail($akaEmail, $subject, $message, $headers);



        if ($mail) { echo "OK"; }

      else { echo "Bir hata oluştu. Lütfen tekrar deneyin."; }



    } # hiç bir doğrulama hatası çıkmazsa bitir, çıkarsa hataları listeliyoruz.



    else {



        $response = (isset($error['name'])) ? $error['name'] . "<br /> 
" : null;

        $response .= (isset($error['email'])) ? $error['email'] . "<br /> 
" : null;

        $response .= (isset($error['message'])) ? $error['message'] . "<br />" : null;



        echo $response;



    } # bir doğrulama hatası olmuşsa burada bitir.



}



?>

Notice: Undefined variable: message in /Users/kobigo/Sites/yedikitamuhendislik.com/sendEmail.php on line 61

Look at what appears to be line 61:

$message .= "Gönd.: " . $name . "<br />";

You're trying to append to $message, but you never defined it in the first place. You can append to it after it's been defined, but on this first line you need to simply define it and assign to it:

$message = "Gönd.: " . $name . "<br />";

The remaining similar lines can append to it.


You're also attaching to the wrong event in your JavaScript code:

$('#send_message').on('submit',function(e){

#send_message is a button, not a form. It doesn't have a submit event. Attach to the form instead:

$('#contact_form').on('submit',function(e){

You trying to append to $message variable on line 61 without initializing it first. Fix line 61 by removing append sign .

 $message = "Gönd.: " . $name . "<br />";

Or initializing variable first like:

 $message = "";