I assume the issue is that you've entered some invalid value and expected parsley to come up with an error-msg when you left the field?
I'm currently struggling with that, too - and it seems to be that way "by design": https://github.com/guillaumepotier/Parsley.js/issues/262 Also the "classy demo" on http://parsleyjs.org/documentation.html does not validate when you immediately enter invalid data, it only does so when you try to send the form.
Anyway, I have opened an issue on https://github.com/guillaumepotier/Parsley.js/issues/385 and hope to understand the problem a bit better and maybe even get that changed ;-)