Use window.onscroll to add the onscroll event handler
<html> <head> <title>OnScroll Example</title> <script type="text/javascript"> window.onscroll = function () { alert("scrolling"); } </script> </head> <body> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> <P>Try scrolling this window.</p> </body> </html>
