Tracking scroll goals in VWO

scrollEventTracker.js

var scrollPos = window.innerHeight;
window.addEventListener('scroll', function(e) {
    var pos = window.scrollY + window.innerHeight;
    window._vis_opt_queue = window._vis_opt_queue || [];
    if (scrollPos < pos) {
        // down
        if ((document.querySelector('div.top').getBoundingClientRect().top + window.scrollY) < pos) {
            window._vis_opt_queue.push(function() {
                _vis_opt_goal_conversion(200);
            });
        }
    }
    scrollPos = pos;
});