Getting Parsley 2 working with Bootstrap 4
<p>By default, Parsley only handles updating a single element's class (usually the input field in which the invalid entry is). However, with Bootstrap 4 we must update both the form-group and the input field classes to render them with the validation icons. Otherwise, only the border colour is changed.</p>

<p>How can I use Parsley to correctly, completely style my input fields when validating user input in the client?</p>