title: detect when textarea is scrolled to bottom
body: <p>Is there a way to gauge when a user has scrolled to the bottom of an element? I know that jQuery can access the <code>scrollTop()</code> of an element, but even combining that with the element's height, I cannot calculate when an element has been scrolled to the bottom-most position. I would like to do this so when scrolling within a textarea I can prevent the body of the document from scrolling once the "scroll bottom" of the textarea is reached.</p>
  
  <p><a href="http://jsbin.com/enIyUYi/1/edit" rel="noreferrer">JSBIN</a></p>