I have also observed egregious redraw flicker when using JQuery's
animate() function in FireFox whenever content has scrollbars. I've
taken a hidescrollbars-animate-showscrollbars workaround. Since most
if not all of JQuery's effects are built on top of animate() it seems
that any effect that moves pixels and has scrollbars will suffer this
same bad fate.
On Dec 22 2009, 9:34 am, alexander farkas
wrote:
> Yes, this is a bigproblem. But, i don´t know a solution. I wrote two
> workarounds for that.
>
> 1. disable scrolbar on body + add padding-right in the size of the
> scrollbar width (has to dynamically calclated) for the time
> theanimationoccurs. between disabling scrollbar and callingslideuphas
> to be a short delay, so that ff can render the disabled scrollbar
> before animating.
>
> pro:
> - although this sounds very obtrusive, the delayed scrollbar change isn
> ´t noticed by normal users
> - this could be easily generalized
> con:
> sometimes the bad effect still happens (if someone knows a reason for
> this, plz tell me)
>
> 2. animate the scrolltop of body at the same time to scroll up
>
> pro:
> - if you make the upscrplling a little faster than theslideup, the
> effect doesn´t appear
>
> con:
> - you can´t generate a generalized code to do this. (multi-colum
> layout etc)
>
> On 22 Dez., 12:39, "Peter Wright" wrote:
>
> > Hello,
>
> > Has anyone else ever noticed a rather disgusting scrollbar redraw
> > causing a page to flicker when the content shrinks in size (usually
> > triggered bySlideUp())?
>
> > This occurs when the document's height is reduced gradually causing the
> > viewport's view to be invalid multiple times a second. so the scrollbar
> > has to be redrawn to handle where the viewport's location matches the
> > bottom of the page. If anyone knows of a graceful solution to implement
> > handling a cleanslideUpwhen the viewport is near the document bottom I
> > would much appreciate it, perhaps something to be considered in the 1.4
> > release?
>
> > Kind regards,
>
> > Peter Wright
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