Calculate Scroll Speed

calculate_scroll_speed

// Calculate Scroll Speed
var lastOffset = $(window).scrollTop();
var lastDate = new Date().getTime();

$(window).scroll(function(e) {
    var delayInMs = e.timeStamp - lastDate;
    var offset = scrollTopValue - lastOffset;
    var speedInpxPerMs = offset / delayInMs;
    var scrollSpeed = Math.abs(speedInpxPerMs.toFixed(2));
    
    console.log(scrollSpeed);
    
    lastDate = e.timeStamp;
    lastOffset = scrollTopValue;
});