title: jQuery Validation Enable Submit Button when Valid
body: <p>I am using jQuery validation on my form and I would like to be able to disable the submit button and change its class, when the form validates. I know I could bind a function on the key up event but I want to know if this is possible from within the jQuery validate framework.  I tried doing what <a href="https://stackoverflow.com/questions/882406/jquery-disable-button-not-submit-until-field-validates-validation-plugin">this guy</a> suggested, but got nowhere.</p>
  
  <p>I am using <a href="http://docs.jquery.com/Plugins/Validation" rel="nofollow noreferrer">jQuery Validate</a></p>