Div scrolling freezes sometimes if I use -webkit-overflow-scrolling

Question

if I use -webkit-overflow-scrolling for a scrolling div, it scrolls perfectly with native momentum. But, div itself sometimes freezes and does not respond my fi

Answer 1

For me, the freezing was repeatable and happened when trying to scroll up or down when already at the top or bottom, respectively. The fix was to add some listeners for touchstart and touchmove and detect these cases and event.preventDefault() on ’em.

Something like the following, where .scroller is the div that will actually scroll (changes to scrollTop).

var lastY = 0; // Needed in order to determine direction of scroll.
$(".scroller").on('touchstart', function(event) {
    lastY = event.touches[0].clientY;
});

$('.scroller').on('touchmove', function(event) {
    var top = event.touches[0].clientY;

    // Determine scroll position and direction.
    var scrollTop = $(event.currentTarget).scrollTop();
    var direction = (lastY - top) < 0 ? "up" : "down";

    // FIX IT!
    if (scrollTop <= 0 && direction == "up") {
      // Prevent scrolling up when already at top as this introduces a freeze.
      event.preventDefault();
    } else if (scrollTop >= (event.currentTarget.scrollHeight - event.currentTarget.outerHeight()) && direction == "down") {
      // Prevent scrolling down when already at bottom as this also introduces a freeze.
      event.preventDefault();
    }

    lastY = top;
});

I hope this helps the next poor soul that encounters this horrible bug! Good luck and keep fighting!