CAPTCHA onComplete Event?

I know theres a way to know when the captcha has been complete by using grecaptcha.getResponse() However is there an event handler or something that can fire when it's complete? I'm asking this because I want to implement a system where the login button is disabled and when the captcha is complete it fires a js function which enables the login button. Any suggestions appreciated! -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.