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 flexcoders@yahoogroups.com, Jeffrey Vroom <j...@...> 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 < > iloveyouwiscon...@...> 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 flexcoders@yahoogroups.com <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! > > > > > > > > > >
