javascript - Recaptcha 2 how to check if user cancels puzzle -
    how detect if user cancelling recaptcha puzzle:   it possible click outside dialog box , close dialog. however, there doesn't seem callback action. necessary return user previous action.   we initializing recaptcha 2 programmatically this:   grecaptcha.render('grecaptchacontainer', {   'sitekey': our_site_key,   'callback': grecaptcha_responds,   'expired-callback': grecaptcha_expires, });   the callback  function called, no problem.   the expired-callback  function never called. figured function called when user cancels/waits long. not case.   could not find in docs or on web. takers?         wiki