title: How to trigger validation before submission in parsley?
body: <p>I'm now using parsley 2 to validate my form, it works fine except this problem: only after you submit your form for the first time, the validation will be triggered when you change your input, but before submission, it will do nothing.</p>
  
  <p>That said, I want to trigger validation before the first submission. How can I achieve this?</p>