There is an example in the DataGrid example of Showcase:
http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/showcase/src/com/google/gwt/sample/showcase/client/content/cell/CwDataGrid.java?r=10228#270

Within the footer getValue() mathod, you can get all of the row data and
extract values and do some math.
John LaBanca | GWT Software Engineer | [email protected]




On Mon, Aug 15, 2011 at 2:30 PM, Mark Wengranowski
<[email protected]>wrote:

> Thanks John!
>
> Do you have an example of how i would total all of the cells in a
> particular column and set the footer (Header instance)?
>
> On Aug 15, 11:19 am, John LaBanca <[email protected]> wrote:
> > If you pass a Header instance as the footer, it will be updated every
> time
> > you push new row data.  You can also refresh footers manually using
> > CellTable#redrawFooters().
> >
> > There is also a pending change that allows you to fully customize headers
> > and footers:http://gwt-code-reviews.appspot.com/1499808/
> > John LaBanca | GWT Software Engineer | [email protected]
> >
> > On Mon, Aug 15, 2011 at 12:10 PM, Mark Wengranowski <
> [email protected]
> >
> >
> >
> > > wrote:
> > > Anyone?
> >
> > > On Aug 9, 1:05 pm, Mark Wengranowski <[email protected]> wrote:
> > > > Hi Everyone,
> >
> > > > I'm trying to add a footer to my CellTable and am having a hard time
> > > > finding information on creating a footer that would update
> dynamically
> > > > based on the cells in that column.
> >
> > > > i.e. I want the last row in my cell table to have a total footer.
> >
> > > > Adding static text is easy as you just pass an extra argument to the
> > > > constructor:
> > > >        cellTable.addColumn(qty, "Qty",Integer.toString(totalQty));
> >
> > > > Thats not what want though.
> >
> > > > If i don't set totalQty to a value before adding the column to the
> > > > CellTable then it shows up as 0. If i try using the funtion
> > > > CellTable.redrawFooters() it does not update the footer with the
> > > > updated variable value for totalQty.
> >
> > > > I see in the documentation that footers are supposed to update
> > > > automatically when set up as a type Header.
> >
> > > > I can' t find any source examples so if anyone could point me in the
> > > > right direction or post an example that would be great.
> >
> > > > Thanks,
> > > > -Mark
> >
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