Disable background scroll when overlay gets opened for iphone devices

See more: (untagged)

When i try to open a overlay and scroll the overlay, even the background gets scrolled.

What I have tried:

I have tried with touchmove event for disable the background scroll but while tried to scroll the overlay even the background gets scrolled though its action is disabled.

$('body').on('touchmove', function(event) {
event.preventDefault();
});
$('.category-list').on('touchmove', function(event) {
event.stopPropagation();
});