I have this html code:

    <form method="POST" action="location/files/myscript.php">
      <input type="radio" name="choice" value="ex1">
      <input type="radio" name="choice" value="ex2">
      <button type="button" id="print">
    </form>

I know there is no submit button, but I send a request with ajax like this:

$('#print').on('click', () => {
request = $.ajax({
            url: "location/files/myscript.php",
            type: "POST",
            data: dataD
        });
}

And my php file looks like this:

$choice = $_POST['choice'];

if($choice == 'ex1') {
   echo "yes";
} else {
   echo "no";
}

I tried with isset and empty too, but I still get Undefined array key "choice"

EDIT: no, I don't want the warning just to disappear. The problem is that I select a radio button and it is still returning that warning. I want it to work, not no hide the warning