Does the lag happen when the renderer is not there?
Cause if it is, then are u loading all 1000 records into the client? Maybe you
can use FDS and the paging feature.
Dimitrios
Optimal Payments.
-----Original Message-----
From: flexcoders@yahoogroups.com on behalf of Pan Troglodytes
Sent: Thu 7/13/2006 7:41 PM
To: flexcoders
Subject: [flexcoders] efficient way of doing custom formatting on datagrid
column values
I have a datagrid with a half-dozen columns, all but one numeric. I've used
itemrenderers to make a label with a built in formatter to get them nice
looking:
<mx:DataGridColumn headerText="Htl Bkgs" paddingRight="4"
dataField="Bookings">
<mx:itemRenderer>
<mx:Component>
<mx:Label width="100%" height="100%" text="{fmt.format(data.Bookings
)}">
<mx:NumberFormatter id="fmt" useThousandsSeparator="true"/>
</mx:Label>
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
Looks cool, but makes for horribly laggy performance when scrolling around
the grid with about 1000 records. What's a better way to do this? Is there
one or are we stuck with this?
Alternately, I've modified the data so that it's formatted when the data is
loaded. But this screws up the sorting requiring me to write custom
sorters. I've also tried breaking out my renderer into another class, but I
still have to create a formatter for every instance since it can't see the
one outside of the renderer. I think this is where the bulk of the slowness
is.
Of course, this may be a moot point. I have some columns that need the text
to be colorered depending on value. When I put an item renderer label on
those with color="{data.value < 0 ? 0xFF0000 : 0x008000}", this bogs down
the scrolling, too. Not sure how I'll get around that.
This just all seems like a lot of trouble and I'm hoping I'm missing
something.
--
Jason
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