Hi!
If you redraw something, you need to submit the form values, otherwise
the redrawn state is different... if that's your case.
**
Martin
2010/3/22 David Chang <david_q_zh...@yahoo.com>:
>
> Hello Martin,
>
> Thanks for your input and sharing your code! I will give it a try.
>
> Did you have the same problem I have now?
>
> Here is what I have for the Country DDC:
>
> countryDDC.add(new AjaxFormComponentUpdatingBehavior("onchange") {
> @Override
> protected void onUpdate(AjaxRequestTarget target) {
> if (target != null) {
> MyUser u = form.getModelObject();
> u.setState(null);
> DropDownChoice stateDDC = (DropDownChoice) form.get("state");
>
> stateDDC.setChoices(objectService.findStatesForLocale(getSession().getLocale()));
> target.addComponent(countryDDC);
> target.addComponent(stateDDC);
> }
> }
> });
>
>
> As you can see, I am using AjaxFormComponentUpdatingBehavior. Why do you use
> AjaxFormSubmitBehavior? In my case, I am not submitting a form.
>
> I am new in Wicket. Thanks for your help!
>
> Best.
> -David
>
>
>
>
>
> --- On Sun, 3/21/10, Martin Makundi <martin.maku...@koodaripalvelut.com>
> wrote:
>
>> From: Martin Makundi <martin.maku...@koodaripalvelut.com>
>> Subject: Re: Ajax has too much control?
>> To: users@wicket.apache.org
>> Date: Sunday, March 21, 2010, 11:38 AM
>> Hi David!
>>
>> Maybe you need this (at least this is what worked for me):
>>
>> /**
>> * @author Martin
>> */
>> public abstract class
>> AjaxFormSubmittingChangeListenerBehavior extends
>> AjaxFormSubmitBehavior {
>> private final static Method hiddenFieldGetter;
>> static {
>> try {
>> hiddenFieldGetter =
>> Form.class.getDeclaredMethod("getHiddenFieldId");
>>
>> hiddenFieldGetter.setAccessible(true);
>> } catch (Exception e) {
>> throw new RuntimeException(e);
>> }
>> }
>>
>> /**
>> * @see
>> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior#onBind()
>> */
>> @Override
>> protected void onBind() {
>> super.onBind();
>>
>> if (!(getComponent() instanceof
>> IOnChangeListener))
>> {
>> throw new
>> WicketRuntimeException("Behavior " + getClass().getName() +
>> " can only be added to an
>> instance of a IOnChangeListener");
>> }
>> }
>>
>> /**
>> * @param event
>> */
>> public
>> AjaxFormSubmittingChangeListenerBehavior(String event) {
>> super(event);
>> }
>>
>> /**
>> * @see
>> org.apache.wicket.ajax.form.AjaxFormSubmitBehavior#onError(org.apache.wicket.ajax.AjaxRequestTarget)
>> */
>> @Override
>> protected void onError(AjaxRequestTarget target) {
>> onSubmit(target);
>> }
>>
>> /**
>> * @see
>> org.apache.wicket.ajax.form.AjaxFormSubmitBehavior#onEvent(org.apache.wicket.ajax.AjaxRequestTarget)
>> */
>> @Override
>> protected void onEvent(AjaxRequestTarget target) {
>> HttpServletRequest httpServletRequest =
>> ((WebRequest) getComponent()
>>
>> .getRequest()).getHttpServletRequest();
>>
>> Map parameters;
>>
>> if (httpServletRequest instanceof
>> MockHttpServletRequest) {
>> parameters =
>> ((MockHttpServletRequest)
>> httpServletRequest).getParameterMap();
>> } else {
>> parameters =
>> ((org.mortbay.jetty.Request)
>> httpServletRequest).getParameters();
>> }
>>
>> parameters.put(getHiddenFieldId(getForm()),
>> getComponent().urlFor(IOnChangeListener.INTERFACE));
>>
>> final FormComponent<?> formComponent =
>> (FormComponent<?>) getComponent();
>>
>> try {
>> if (isUpdateModel()) {
>> formComponent.inputChanged();
>> formComponent.validate();
>>
>> if
>> (!formComponent.hasErrorMessage()) {
>> formComponent.valid();
>>
>> formComponent.updateModel();
>> }
>> }
>>
>> super.onEvent(target);
>> } catch (RuntimeException e) {
>>
>> Utils.errorLog(AjaxFormSubmittingChangeListenerBehavior.class,
>> e);
>> onError(target);
>> }
>> }
>>
>> /**
>> * @return boolean
>> */
>> protected boolean isUpdateModel() {
>> return true;
>> }
>>
>> /**
>> * @param form
>> * @return String
>> */
>> private String getHiddenFieldId(Form<?> form)
>> {
>> try {
>> Form<?> root =
>> form.getRootForm();
>> return (String)
>> hiddenFieldGetter.invoke(root);
>> } catch (Exception e) {
>> throw new RuntimeException(e);
>> }
>> }
>> }
>>
>>
>> public abstract class
>> AjaxFormSubmittingChangeListenerDropDownChoice<T>
>> extends
>> DropDownChoice<T> {
>> /** Initialize */ {
>> add(new
>> AjaxFormSubmittingChangeListenerBehavior(JavaScriptConstants.ONCHANGE)
>> {
>> @Override
>> protected void
>> onSubmit(AjaxRequestTarget target) {
>>
>> AjaxFormSubmittingChangeListenerDropDownChoice.this.onSubmit(target);
>> }
>> });
>> }
>>
>> /**
>> * @see
>> org.apache.wicket.MarkupContainer#toString()
>> */
>> @Override
>> public String toString() {
>> return super.toString() + " Value: " +
>> getValue();
>> }
>>
>> /**
>> * @param id
>> * @param choices
>> * @param renderer
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<List<? extends T>>
>> choices, IChoiceRenderer<T> renderer) {
>> super(id, choices, renderer);
>> }
>>
>> /**
>> * @param target
>> */
>> protected abstract void onSubmit(AjaxRequestTarget
>> target);
>>
>> /**
>> * @param target
>> */
>> protected void onError(AjaxRequestTarget target) {
>> onSubmit(target);
>> }
>>
>> /**
>> * @param id
>> * @param choices
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<List<? extends T>>
>> choices) {
>> super(id, choices);
>> }
>>
>> /**
>> * @param id
>> * @param model
>> * @param choices
>> * @param renderer
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<T> model,
>> IModel<List<? extends T>>
>> choices, IChoiceRenderer<T> renderer) {
>> super(id, model, choices, renderer);
>> }
>>
>> /**
>> * @param id
>> * @param model
>> * @param choices
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<T> model,
>> IModel<List<? extends T>>
>> choices) {
>> super(id, model, choices);
>> }
>>
>> /**
>> * @param id
>> * @param model
>> * @param data
>> * @param renderer
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<T> model,
>> List<? extends T> data,
>> IChoiceRenderer<T> renderer) {
>> super(id, model, data, renderer);
>> }
>>
>> /**
>> * @param id
>> * @param model
>> * @param choices
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> IModel<T> model,
>> List<? extends T> choices) {
>> super(id, model, choices);
>> }
>>
>> /**
>> * @param id
>> * @param data
>> * @param renderer
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> List<? extends T> data,
>> IChoiceRenderer<T> renderer) {
>> super(id, data, renderer);
>> }
>>
>> /**
>> * @param id
>> * @param choices
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id,
>> List<? extends T> choices) {
>> super(id, choices);
>> }
>>
>> /**
>> * @param id
>> */
>> public
>> AjaxFormSubmittingChangeListenerDropDownChoice(String id) {
>> super(id);
>> }
>> }
>>
>>
>> **
>> Martin
>> 2010/3/21 Sven Meier <s...@meiers.net>:
>> > David,
>> >
>> >>It seems that you do not understand the problem I
>> have
>> >
>> > obviously not ;).
>> >
>> > A quickstart would help me to understand your problem
>> better, but perhaps
>> > others have already a clue?
>> >
>> > Sven
>> >
>> > David Chang wrote:
>> >>
>> >> 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!
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>
>> >>>
>> ---------------------------------------------------------------------
>> >>>
>> >>>>
>> >>>> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org
>> >>>> For additional commands, e-mail: users-h...@wicket.apache.org
>> >>>>
>> >>>>
>> >>>>
>> >>>
>> >>>
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>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >>
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>> >>
>> >>
>> >
>> >
>> >
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>> >
>> >
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>>
>
>
>
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