title: How can I add a onScroll event to iScroll4?
body: <p>The <code>onScroll</code> event is not yet supported by the <a href="http://cubiq.org/iscroll-4" rel="noreferrer">iScroll4</a>. </p>
  
  <p>Is there a known way to extend the iScroll to support an <code>onScroll</code> event?</p>