php - How do I get the value of textarea that is created in while loop

I have the problem, that I can't access the value my textareas which are created in awhile loop of php. I guess that they are not registered in the DOM. Same is for the button that is attached to it. So I do know, that I have to access the button via jquery with the special event listener because of this dynamically creation. I get all the IDs that I need, but I am not able to get the value of the textarea, even that I can get its correct ID, as it somehow seems to be just empty. As I can't post a php fiddle in here, here is an example of how it works.

                    include"connection.php";
                    $stuff="here is the query";     
                    for ($n = 1; $n <= 13; $n++) {
                    $xy=$con->query($stuff);
                    while($row=mysqli_fetch_assoc($xy))
                        {
                        $value = $row['value'];
                        echo"<div id='$n' class='antworten'>$value<br>
                              <div id='notizcontainer$n' class='antwortcontainer'>Notizen:</div>
                              <div class='antwortcontainer' id='notizerstellen$n'>Notiz erstellen:<br>
                              <textarea id='notizfeld' class='textarea'></textarea><br>
                              <button id='absenden' class='notizabsenden'>Notiz absenden</button></div>
                              </div>";
                            }
                     }
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jQuery:

    $(document).on('click', '.notizabsenden', function(){ //do this bc its not registered and .click() is not working, also I need the click event on the button class to know on which button the event is going on
            var parentid = $(this).parent().attr('id'); //get parentid of button
            var notizid = $('#'+parentid).find('textarea').attr('id'); //find id of textarea of parent 
            var notiz = $('#'+notizid).val(); //this should give me the text of the textarea... but it returns empty/blank
            console.log(notizcontainer); //this turns out correct
            console.log(parentid); //this turns out correct
            console.log(notiz); //this returns empty/blank as if the textarea has nothing in it... which it does
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