Выключить сколл

off-scroll.js

if ($(window).width() < 992) {
        var _overlay = document.getElementsByClassName('no-scrolling');
        var _clientY = null;
        for (var i = 0; i < _overlay.length; i++) {
            _overlay[i].addEventListener('touchstart', function (event) {
                if (event.targetTouches.length === 1) {
                    _clientY = event.targetTouches[0].clientY;
                }
            }, false);
            _overlay[i].addEventListener('touchmove', function (event) {
                if (event.targetTouches.length === 1) {
                    disableRubberBand(event, this);
                }
            }, false);
        }
        function disableRubberBand(event, el) {
            var clientY = event.targetTouches[0].clientY - _clientY;
            if (el.scrollTop === 0 && clientY > 0) {
                event.preventDefault();
            }
            if (isOverlayTotallyScrolled(el) && clientY < 0) {
                event.preventDefault();
            }
        }

        function isOverlayTotallyScrolled(el) {
            return el.scrollHeight - el.scrollTop <= el.clientHeight;
        }
    }