title: Is there a way to detect when an overflow-y:auto has been triggered, and create a popup as a result?
body: <p>I have a website that allows a user to keep adding text to a box. I want them to be able to keep adding text to it <em>until</em> it gets to the point where it would create a scrollbar. Instead of creating a scrollbar, I want the website to basically stop them from adding anymore text to it, with a popup that essentially says "In order to add more text, you need to be a member."</p>
  
  <p>Is this possible? Does anyone have tips on how to best do this?</p>
  
  <p>For now, I just have a simple textarea, aka:</p>
  
  <pre><code>&lt;textarea rows="4" cols="50" style="overflow-y:auto;"&gt;
  At w3schools.com you will learn how to make a website. We offer free tutorials in all web development technologies.
  &lt;/textarea&gt;
  </code></pre>