Sven,
Thanks for your input. It seems that you do not understand the problem I have
(Wicket problem??? or my page problem???). I know how Ajax works by adding
components to Ajax request target.
When it is non-Ajax, my page runs correctly with all three controls. When
Country DDC Ajax-controls State DDC, the two DDC works correctly. The problem
is that once this Ajax control is triggered by selecting a value in Country
DDC, the State DDC list is NOT updated when the Locale DDC value is changed.
I have a feel that Wicket has a problem here. I am using Wicket 1.4.7.
Regards.
-David
--- On Sun, 3/21/10, Sven Meier <s...@meiers.net> wrote:
> From: Sven Meier <s...@meiers.net>
> Subject: Re: Ajax has too much control?
> To: users@wicket.apache.org
> Date: Sunday, March 21, 2010, 7:25 AM
> Hi David,
>
> DropDownChoice#wantOnSelectionChangedNotifications() will
> trigger
> rendering of the complete page.
> On Ajax request only those components are rendered you
> explicitely 'add'
> to the request, see AjaxRequestTarget#addComponent().
>
> If you want to have the same for Ajax requests, you can
> just 'add' the
> complete page.
>
> This is not very efficient though.
>
> Sven
>
> David Chang wrote:
> > Forgive me about this meaningless subject, but I
> cannot think of a better one.
> >
> > I have been learning Wicket through the WIA book. I
> just found out something interesting to me. Not sure it is a
> bug, design, or something I did wrong.
> >
> > I have a page with three Wicket elements:
> >
> > 1. Locale selector through a DropDownChoice list. WIA
> has complete code about how this works and I copied the
> solution into this page
> >
> > 2. Country DropDownChoice, whose values change between
> English and Chinese depending on Locale DDC.
> >
> > 3. State DropDownChoice, whose values change between
> English and Chinese depending on Locale DDC. The values in
> this DDC depends on the chosen value in Country DDC.
> >
> > Here are the experiments
> >
> > Experiment#1.
> >
> > Country DDC does not control values in State DDC via
> Ajax and it has
> >
> > protected boolean
> wantOnSelectionChangedNotifications() {
> > return true;
> > }
> >
> > Everything works like a charm, which means
> >
> > (1) when Country DDC value changes, State DDC changes
> accodingly.
> > (2) when Locale changes, both Country DDC and State
> DDC lists change display values accordingly (which means
> both DDCs show a list of values in the same language).
> >
> > Experiment#2.
> >
> > Country DDC controls values in State DDC via Ajax. In
> this case, when page is first loaded, I do not touch the
> Country DDC or State DDC. I simply change locale value any
> number of times, both Country DDC and State DDC lists change
> correctly depending on the session locale. Here is the
> strange thing. Then I change Country DDC value, State DDC
> changes correctly. Since then, HOWEVER, if I change locale
> values, ONLY Country DDC list changes correctly; State DDC
> list is not updated. It seems Wicket decides that State DDC
> is forever Aja-controlled by Country DDC only.
> >
> > Not qure sure if this a bug, design, or I did
> something wrong.
> >
> > Please let me if you have difficulty understanding the
> experiments.
> >
> > Thanks for any info or help.
> >
> > Cheers!
> >
> >
> >
> >
> >
> >
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> >
> >
>
>
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