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.saliho...@...> 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! > > > > > > > > > > > > > > > > > > > > > > >
