ajax

<!-- ======================= custom.js==================== -->

(function($) {
  $('.input-text').on("change", function () {
    //get the selected value

    var selectedValue = $(this).val();
        $('.fuck').text( selectedValue );
        // alert($(this).val());

    //make the ajax call
    $.ajax({
      url: "testos.php",
      type: "POST",
      data: {url : selectedValue},
      success: function(){
        alert('success');
      },
      error: function(){
        alert('error !');
      }
    });
  });
})(jQuery);

<!-- ======================= testos.php ==================== -->

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>

  <?php
  $display_data = isset( $_POST['url'] ) ? $_POST['url'] : '';
  echo $display_data;
  var_dump($display_data);
  ?>

  <form action="" method="post">
    <input type="text" class="input-text" name="inputtxt" placeholder="Input Your Text">
  </form>

<script src="jquery-1.11.1.js"></script>
<script src="custom.js"></script>
</body>
</html>