<html><head> <title>DOMMouseScroll Event Example</title> <script type="text/javascript" src="/upload/files/201702/client.js"></script> <script type="text/javascript" src="/upload/files/201702/EventUtil.js"></script></head><body> <div id="myDiv">Try scrolling your mouse wheel (Firefox only).</div> <script type="text/javascript"> EventUtil.addHandler(window, "DOMMouseScroll", function(event){ event = EventUtil.getEvent(event); alert(event.detail); }); </script></body></html>