nevermind...just saw the view source
--- In [email protected], "iloveyouwisconsin" <iloveyouwiscon...@...>
wrote:
>
> I should be more clear: How would I set the scrollbar to position at the
> bottom of the datagrid (and then snap to the appropriate position when it the
> user is ready to load more data) as they do here?
> http://blog.tremend.ro/2009/03/02/flex-live-scroll-datagrid/
>
> That would prevent users from retrieving too much data at one time & crashing
> the grid.
>
> --- In [email protected], "iloveyouwisconsin" <iloveyouwisconsin@>
> wrote:
> >
> > It's not a traditional dataset. We're tweaking the structure slightly.
> > How would I do somthing like the following in Flex 4?
> > http://blog.tremend.ro/2009/03/02/flex-live-scroll-datagrid/
> >
> >
> >
> > --- In [email protected], "Florian" <florian.salihovic@> wrote:
> > >
> > > But on the other Hand: why would you want to display more then a few
> > > hundred rows?
> > >
> > > There are way more efficient ways to walk through the data.
> > >
> > > --- In [email protected], "iloveyouwisconsin"
> > > <iloveyouwisconsin@> wrote:
> > > >
> > > > Thanks! I will look into that. For now, is there a quick and dirty way
> > > > to not show the scrollbar so users can't thumb through the results? I
> > > > would still need the ability to scroll through the datagrid, either
> > > > through the up/down arrow keys or the wheel on the mouse.
> > > >
> > > > thanks again!
> > > >
> > > > --- In [email protected], Jeffrey Vroom <jeff@> wrote:
> > > > >
> > > > > Back when I was at Adobe, I had a demo which did paging with 60K
> > > > > records in
> > > > > the query being scrolled. It probably could have done more if I
> > > > > tried
> > > > > since it was doing everything incrementally, though I'll admit the
> > > > > experience was not perfect, particularly if you moved the thumb too
> > > > > quickly.
> > > > >
> > > > > This was using the DataService with LCDS on the backend but it would
> > > > > be the
> > > > > same client code with "client data management" in flex builder.
> > > > >
> > > > > There were some tricks to deal with the big data sets:
> > > > > - paging automatically pages in objects but never releases the
> > > > > paged in
> > > > > objects by default. You can add this manually with the
> > > > > releaseItemsFromCollection method. You put this into a scroll event
> > > > > handler, periodically (but not too often) releasing any invisible
> > > > > data.
> > > > > - keeping the page request queue from getting too large. This
> > > > > was one
> > > > > problem I never solved completely... as you move the thumb, the data
> > > > > grid
> > > > > can request pages faster than they can be filled/released. There
> > > > > should be
> > > > > a way to either limit the page requests or keep them in a queue that
> > > > > can be
> > > > > flushed if you call the release method.
> > > > >
> > > > > I did a quick google search on "releaseItemsFromCollection" and it
> > > > > looks
> > > > > like the code from my demo made it into the LCDS docs. Not sure that
> > > > > even
> > > > > with this call it will do what you want but without that release
> > > > > call, the
> > > > > automatic paging stuff would eventually just keel-over from having
> > > > > too much
> > > > > in-memory. If that seems like the major problem, it might be worth
> > > > > trying
> > > > > it out.
> > > > >
> > > > > Jeff
> > > > >
> > > > > On Sun, Mar 14, 2010 at 11:28 AM, iloveyouwisconsin <
> > > > > iloveyouwisconsin@> wrote:
> > > > >
> > > > > >
> > > > > >
> > > > > > Maybe I'll have to wait until Flex 7 (or later) 'til they truly
> > > > > > make flex
> > > > > > able to handle large datasets smoothly. (I guess I'll also have to
> > > > > > advise
> > > > > > those at Adobe and the flex evangelists that what they define as a
> > > > > > "large"
> > > > > > dataset isn't large in practice. They probably need to moonlight as
> > > > > > interns
> > > > > > for a few of their customers to snapback into reality. There's no
> > > > > > company in
> > > > > > the real world that would define a large dataset as only a few
> > > > > > thousand
> > > > > > items)
> > > > > >
> > > > > > --- In [email protected] <flexcoders%40yahoogroups.com>,
> > > > > > "iloveyouwisconsin" <iloveyouwisconsin@> wrote:
> > > > > > >
> > > > > > > How many records is considered "too large" for a datagrid to
> > > > > > > handle? I am
> > > > > > using Flex 4 with Zend AMF & paging enabled. When I google it the
> > > > > > topic,
> > > > > > most seem to think that a "few thousand" is large, but that doesn't
> > > > > > seem
> > > > > > hardly anything to me. I thought Zend would do the trick but it
> > > > > > isn't
> > > > > > anywhere near what I need. My 15 million records didn't go over too
> > > > > > well (I
> > > > > > can use the scroll wheel on my mouse to scroll through the records
> > > > > > but it
> > > > > > kept crashing when I tried to use the scrollbar on the datagrid to
> > > > > > jump
> > > > > > around). I ask because I don't want to have to jimmy around with
> > > > > > code until
> > > > > > I'm blue in the face trying to find something flex can handle. Can
> > > > > > I do 1
> > > > > > million? 5,000? 500,000? I just want to be able to let users play
> > > > > > around w/
> > > > > > the scrollbar on the datagrid without it crashing, is all (though I
> > > > > > realize
> > > > > > that the user's machine will play a big factor in performance. All
> > > > > > of my
> > > > > > users have computers that are no more than a couple yrs old)
> > > > > > >
> > > > > > > I also ask because I am sure others would like to know for their
> > > > > > projects....is there a more efficient way to get the data than
> > > > > > Zend, like
> > > > > > Livecycle or Coldfusion? I am willing to switch the backend up a
> > > > > > bit in
> > > > > > order to increase performance of my app.
> > > > > > >
> > > > > > >
> > > > > > > many thanks!
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
