Mengapakah penyerahan borang jQuery saya tidak sampai ke pelayan PHP saya?

<code class="html"><form id="contactForm" name="contactForm" method="post">
    <!-- Input fields and textarea -->
    <input id="submitBtn" type="submit" name="submit" value="Trimite">
</form></code>

<code class="javascript">$(document).ready(function(e) {
    $("#contactForm").submit(function() {
        $.post("getcontact.php", $("#contactForm").serialize())
        .done(function(data) {
            if (data.trim().length > 0) {
                $("#sent").text("Error");
            } else {
                $("#sent").text("Success");
            }
        });

        return false;
    })
});</code>

<code class="php">$nume = $_REQUEST["nume"]; // Empty
$email = $_REQUEST["email"]; // Empty
$telefon = $_REQUEST["telefon"]; // Empty
$comentarii = $_REQUEST["comentarii"]; // Empty</code>

<code class="javascript">var datastring = $("#contactForm").serialize();
$.ajax({
    type: "POST",
    url: "your url.php",
    data: datastring,
    contentType: false,
    processData: false,
    dataType: "json", // If desired
    success: function(data) {
        // Handle success
    },
    error: function() {
        // Handle error
    }
});</code>