Hi,
looking at the upcoming virtual table I think there is definetly
performance optimization potential by using a HTML-Renderer instead of a
widget-renderer, just because of the things you mentioned (the number of
DOM elements, ...)
But on the other hand...how can one address one specific cell without
wrapping a div-container around it ? The optimization of using HTML
instead of widgets for each cell makes sense if the table is simple,
that is: there is no edit behaviour, there are no cell-specific things
like background-color and so on.
So these are my thoughts.:)
Cheers,
Rob.
>>> benco <[email protected]> 10/18/2011 10:14 >>>
Hi,
MartinWittemann wrote:
>
> Hey,
> I think the main reason for that is still the virtualization only
for
> rows. The columns don't get virtualized which is ofc a problem in the
case
> of a lot of columns. So even if there is an additional factor which
> reduces the speed there, you wont get it working fast enough if you
want
> to have 160 Columns.
>
These last days, I was wondering if virtualization was still a good
solution
in the long term.
I explain why... The main problem behind the table widget speed is
mainly
the number of DOM elements.
Virtualization in general is really great when dealing with small
sized
screens.
But I recently bought a new 27'' lcd screen. In one of my qx projects,
I
have a table rendered on the whole page and I must say it becomes
really
slow when the screen resolution is high (because all the cell's dom
elements
are then taken into account of course).
As screen resolution increases from year to year, it becomes a real
problem... I'm sure that browsers will become faster and faster at the
dom
level in the long term but will it be enough ?
I think I'll start making experiments with a <canvas> based table (with
a
fallback for old browser to the current solution - or possibly
flash)... As
<canvas> is hardware accelerated, the speed would still be acceptable
and
furthermore, we then avoid the current numerous <div> cells...
Best,
Benoît.
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