Prevent Enter key from proceeding movie

Question

I am using this code to get the user to enter the answer 16
in an input text field. It works but if the user hits the enterkey
after they've gotten the question right, the playhead starts and
moves to incorrect. This is not happening only in the testing
environment, the published file continues when Enter is pressed.
Can anyone help?
keyListener = new Object();
keyListener.onKeyUp = function() {
if (input_txt2.text == "16" and Key.getCode() == 13) {
//13 is key code for 'Enter'//
gotoAndPlay("1_3_13a");
_root.answer1 = "Correct!";
} else if (input_txt2.text != "16" and Key.getCode() == 13)
//13 is key code for 'Enter'//
_root.answer1 = "Incorrect.";
gotoAndPlay("1_3_13b");
Key.addListener(keyListener);

Answer 1

I'm not following what "…activated when the enter key
is pressed even after the event has occurred." means. You mean that
even after this first entry you press enter and the value of
input_txt2.text != "16" so it is jumping to 1_3_13B?
I think I know what you mean, maybe. Notice how you are
setting up a listener? Well it keeps listening, it isn't a one time
deal. It listens for a keyUp until you tell it to stop. So just
because it works once why would you expect it to stop working? :)
What you need to do is either inside your conditionals or
perhaps just inside the onKeyUp function put a
Key.removeListener(keyListener); to tell it to stop listening. If
you are doing some kind of remediation at 1_3_13b and then want
them to have another try, perhaps you will want to leave the
listener or you might want to remove it and then add it back. I
don't know the exact structure of what you are doing, but I hope
this points you in the correct direction.