I'm building a presentation with Impress.js I want to scroll sliders with mousewheel and not with keyboard arrows. I've tried anything possible, but I don't find a solution. With addEventListener('mousewheel') not work. Any suggest? This is found on github but not work:
document.addEventListener("mousewheel", function( event ) {
next = steps.indexOf( active ) - event.wheelDelta / Math.abs(event.wheelDelta);
next = next >= 0 ? steps[ next ] : steps[ steps.length-1 ];
select(next);
}, false);