title: performing few actions when adding a new specific class
body: <p>When my page is loading the is no class "changed_value" in the page.
  I am adding the calss "changed_value" in several places in the code.</p>
  
  <p>In case of adding this class I wish to perform several actions.</p>
  
  <p>The problem is that  don't wish to write all these actions each time I add the class.</p>
  
  <p>Is there a way to call to some function which will perform the few requested actions in case of adding (at the first time or every time) this new class?</p>
  
  <p>Means, is there a trigger such 'change', 'click' but for adding new class?
  Like addedClass?
  (I am sure there is no such trigger but I need this idea)...</p>
  
  <p>Thanks in advance!</p>
  
  <p>Miki</p>