javascript - Revolution Slider - Advance once per mouse scroll -

edit: revolution slider updated version 5 default supports mouse scrolling between slides without need additional javascript user , i've found work flawlessly.

original question:

i'm using full screen revolution slider , using code found on developers site i've managed slides advance using mousewheel scroll.

the problem slider advancing more 1 slide @ time depending on how user scrolls. need slide scroll once per mousewheel event. tried using solution found here couldn't work: removing event after 1 scroll

i'm new javascript appreciated.

here code using

(function() {   var slider = revapi1;   slider.parent().on('mousewheel dommousescroll', function(event) {   if(event.originalevent.wheeldelta > 0 || event.originalevent.detail < 0) {   slider.revprev();   }  else {   slider.revnext();   }   });  })() 

revprev() , revnext() moves happen.

deeper should find speed, steps_length...