My submit button stays disabled?

Can anyone tell me where the error is in this code and why it won't submit even when password and confirm password match? $("form span").hide();

function isPasswordValid() { return $password.val().length > 8; }

function arePasswordsMatching() { return $password.val() === $confirmPassword.val() }

function canSubmit() { return isPasswordValid() && arePasswordsMatching(); }

var $password = $("#password"); var $confirmPassword = $("#confirmPassword");

function passwordEvent() { if(isPasswordValid()) { $password.next().hide(); } else { $password.next().show();
} }

function confirmPasswordEvent() { if(arePasswordsMatching()) { $confirmPassword.next().hide(); } else { $confirmPassword.next().show(); } }

function enableSubmitEvent() { $("#submit").prop("disabled", !canSubmit()); }

$password.focus(passwordEvent).keyup(passwordEvent).keyup(confirmPasswordEvent).keyup(enableSubmitEvent);

$confirmPassword.focus(confirmPasswordEvent).keyup(confirmPasswordEvent).keyup(enableSubmitEvent);

enableSubmitEvent();