matt matt - 1 month ago 9
CSS Question

iOS overflow-x (or position absolute) makes scrolling choppy?

I want my webpage to be only scrollable vertically. So I've set

overflow-x:hidden;
to my
.page-wrapper
. My
.page-wrapper
holds two absolute positioned layers on top of each other. When clicking a button the top layer is sliding to the side (as mentioned
position:absolute;
) and makes the website actually wider than the 100% viewport witdh - so it would be scrollable horizontally.

To prevent the horizontal scrolling I've set
overflow-x:hidden
to my
.page-wrapper
.

If I do that, the vertical scrolling of my normal content is really buggy and doesn't work correctly.

Any ideas how to fix that?

UPDATE

-webkit-overflow-scrolling: touch;
seems to work fine as long no javascript is changing any heights. See the following example. What I'm doing here is updating the height of the body to the contents-height of the second layer - so there is no empty scrolling space once the upper layer is slid to the left. When sliding the upper layer back I remove the attribte
style
(which sets the height) from the body. After doing that the scroll is choppy again.

function showInfos(show) {

if ( show ) {
$('#videos').addClass('slid');
$('body').height($('#infos > .content').height());
$('#page-wrap').addClass('no-overflow');
} else if ( !show ) {
$('#videos').removeClass('slid');
$('#page-wrap').removeClass('no-overflow');
$('body').removeAttr('style');
}
}

Answer

You could try setting width:100% on .page-wrapper and set that to overflow:hidden and position:relative. That might prevent the horizontal scroll.

Updated 10/12/2012

Thanks for the code example. It really helped me see your intent and the issue with scrolling more clearly. It looks like you need -webkit-overflow-scrolling. Add -webkit-overflow-scrolling: touch; to page-wrapper. Here's an [updated test page] with that rule applied. You can compare with test page in my comment below to see the difference.

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