jquery - Disable scrolling but capture scrolling data with JavaScript? -

i'm trying prevent default scrolling behavior while still determining number of pixels user has attempted scroll.

my objective (at vertical position on page) fix navigation element top of screen , hijack scroll/swipe event pull down mobile menu when user scrolls (so moving said element , down n pixels depending on how many pixels user tries scroll).

i aware of ux/accessibility concerns insofar blocking native behavior, suits want suits want.

so far have:

$('body').on({  'mousewheel' : function(e) {     e.preventdefault();      e.stoppropagation();  } });  

but stumped how access number of pixels scrolled (since element/scroll offsets no longer guide).

edit: please note question asking information regarding mouse/scroll actions while scrolling blocked. don't think has been appropriately marked duplicate.

this browser-depended because of mousewheel event using. because non-standard. don't use it!

in chrome (43.0) different properties different values:

e.originalevent.wheeldelta: -120 e.originalevent.wheeldeltay: -120 e.originalevent.deltay: 100 

in ie (11.0), can 1 property:

e.originalevent.wheeldelta: -120 

in firefox (38.0.5), capturing of mousewheel event doesn't work @ all.

solution:
use wheel event (mdn reference). event has e.originalevent.deltay property in browsers.