[danik.js]

<script src="//code.jquery.com/jquery.min.js"></script>
<script>
$(document).on('change','.parentClass form',function(){
            alert('changed'); return;
            $(this).parents('.parentClass').addClass('changed')
        });
</script>


<div class ="parentClass">
              <form class = "form">
                     <input type = 'text'>
                     <input type = 'text'>
                     <select>
                        <option>Bla bla</option>
                        <option>Option</option>
                     </select>
              </form>
</div>