mousewheel event is not triggering in firefox browser
This is 2017 and the right answer is now:
$(window).on('wheel', function(event){ // deltaY obviously records vertical scroll, deltaX and deltaZ exist too if(event.originalEvent.deltaY < 0){ // wheeled up } else { // wheeled down }});Works with current Firefox 51, Chrome 56, IE9+
Note: The value of the deltas will depend on the browser and the user settings.
Firefox doesn't recognize "mousewheel" as of version 3. You should use "DOMMouseScroll" instead for firefox.
check this: http://www.javascriptkit.com/javatutors/onmousewheel.shtml
Use wheel event. This page also provides polyfills for old browsers https://developer.mozilla.org/en-US/docs/Web/Events/wheel