What I was getting confused about doing it this way though is if I'm
allowing the data to be sorted by 4 or 5 different columns, would I
have to say something like:
if (event.isSortAscending && nameColumn) {
Collections.sort(newData, nameAscComparator)
} else if (nameColumn) {
Collections.sort(newData, nameDescComparator)
} else if (event.isSortAscending && timeRequestedColumn) {
Collections.sort(newData, timeRequestedAscComparator)
} ....
ya know where I have to have a different asc and desc comparator for
each column and figure out which column was selected before I sort?
I'm thinking that I'll have a small enough set of rows (probably max
100 rows at a time), that if I just make the columns sortable, it will
be fine if I don't use paging. So maybe I should do what Greg
mentioned and download all the data and use a ListDataProvider. What I
liked about the AsyncDataProvider though is that people can change the
value of a cell and hit enter and it's updated in the database because
this will be an application a couple are using at one time all dealing
with the same data so I need changes to show up on what other people
are seeing.
BTW, thanks a lot guys!
On Feb 14, 10:00 am, John LaBanca <jlaba...@google.com> wrote:
> If you are supporting paging, then a local sort will only sort the current
> page, whereas a database sort would sort the data return the results for the
> current page. For example, if you are on the first page and do a reverse
> sort, do you want to see all the names that start with z (database sort), or
> do you want to see all of the names that start with a in reverse order
> (local sort of the current page).
>
> That being said, you can cache the values locally in a list and use
> ListSortHandler. Alternatively, you can add a ColumnSortEvent.Handler to
> CellTable and copy and sort the return of CellTable#getVisibleItems(). The
> code would be something like the following:
>
> cellTable.addColumnSortHandler(new ColumnSortEvent.Handler() {
> public void onColumnSort(ColumnSortEvent event) {
> List<T> newData = new ArrayList(cellTable.getVisibleItems()); // Copy
> the data
> if (event.isSortAscending) {
> Collections.sort(newData, myAscComparator); // Sort ascending.
> } else {
> Collections.sort(newData, myDescComparator); // Sort descending.
> }
> cellTable.setRowData(cellTable.getVisibleRange(), newData);
> }
>
> });
>
> Thanks,
> John LaBanca
> jlaba...@google.com
>
>
>
>
>
>
>
> On Mon, Feb 14, 2011 at 12:53 AM, Josh K <kendrick.j...@gmail.com> wrote:
> > I've been developing an application in GWT that has data I've been
> > displaying in a CellTable. I've set it up with a few TextColumns and a
> > few EditTextColumns. I've got it set up to where if someone changes
> > the data in an EditText cell, it sends an asynchronous request to the
> > database and updates that row in the DB table. In short, I've got all
> > this working using AsyncCallbacks and an AsyncDataProvider.
>
> > Since 2.2 came out, I want to implement column sorting, kind of like
> > is seen in this example:
> >http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTable
> > , but with an AsyncDataProvider. I want to sort the columns locally
> > because I think it'd be faster than making an Async DB call again each
> > time someone clicks to sort (which is the impression of what was
> > supposed to happen if I used an AsyncHandler.
>
> > So I THINK what I'm looking for is some way to use a ListHandler with
> > an AsyncDataProvider?
>
> > Can anyone shed some light on this? Maybe done it before or know the
> > direction I'm supposed to? If it's even do-able?
>
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