title: jQuery toggleClass callback how to?
body: <p>I have this simple jQuery event with <code>toggleClass</code>:</p>
  
  <pre><code>$(this).on("click", function() {
      $(this).toggleClass("fa-stop-circle");
  });
  </code></pre>
  
  <p>I would like to call some method if <code>fa-stop-circle</code> is added. How can I monitor this event?</p>