JQuery -> Ajax -> PHP -> 500 internal server error

Question

I am struggling with a 500 internal server error. I have made just a basic script to test, but its just getting 500 anyways. Do you see a typo or logic errors? I am to blind right now to see an error.

AJAX

$("#select_kjede").change(function(){
         var kjede = $("#select_kjede option:selected").val();

        $.ajax({
          type: "POST",
          url: "bestilling/controller.php",
          data: { 
            kjede: kjede 
          }
          })
          .done(function( msg ) {
               alert(msg);
          });
});

PHP

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $message = $_POST["kjede"];
    echo "<script type='text/javascript'>console.log("."OLOL ".$message."</script>";
}

In the PHP-script i have tried a numerous methods, included if(isset($_POST['kjede'])

EDIT: In Chrome console under the error -

send 
b.extend.ajax 
(anonymous function) 
b.event.dispatch 
v.handle

How can i console out the server errors?

Answer 1

I wanted to ask what your form looks like. But I could not comment. Your code works fine with the following form.

<form id="select_kjede">
    <select>
        <option>option_one</option>
        <option>option_two</option>
        <option>option_three</option>
    </select>
    <input type="submit" value="save"/> 
</form>