The solution can be found here:
http://forum.java.sun.com/thread.jspa?messageID=4027008
Mike
--- Mike Duffy <[EMAIL PROTECTED]> wrote:
> What I am looking for is a way to automatically propagate a change from one
> drop down list to
> another without having to submit the form.
>
> This can be easily done in a pure Java Script approach using an onClick
> function. However, this
> approach breaks in JSF.
>
> As a very simple example, if dropdown "A" contains values for years, and drop
> down "B" contains
> values for car models in a given year, you can use JavaScript to change
> dropdown "B" when a user
> makes a selection from dropdown "A". You do not set up any options in your
> JSP in dropdown "B";
> the options are contained in the function and the browser puts the right
> options in the DOM when
> the function is selected.
>
> The change actually works in the browser for a JSF page; however, when the
> form is submitted an
> error is generated: "formName:carModel invalid value".
>
> It seems like JSF might be doing a validation against the possible options in
> the dropdown list
> to
> insure the the option value is valid when compared to that list; because no
> options are found,
> an
> error is generated. If this is the case, there are many JavaScript
> techniques that will not be
> valid in JSF.
>
> Any suggestions or insights would be greatly appreciated.
>
> Mike
>
>
>
> --- [EMAIL PROTECTED] wrote:
>
> > Hi!
> >
> > No the form is submitted (because a ValueChangeListener needs this)
> >
> > With the following I display the same page again, but this time with the
> > new items in the
> second
> > selectbox:
> >
> > if (event.getComponent().getId()
> > > .equalsIgnoreCase("newpartnerMandanten")) {
> > > String viewId = "/newpartner.jsp";
> > > FacesContext context =
> > > FacesContext.getCurrentInstance();
> > > UIViewRoot view =
> > > context.getApplication().getViewHandler()
> > > .createView(context, viewId);
> > > view.setViewId(viewId);
> > > context.setViewRoot(view);
> > > context.renderResponse();
> >
> >
> > -----Ursprüngliche Nachricht-----
> > Von: Mike Duffy [mailto:[EMAIL PROTECTED]
> > Gesendet: Mittwoch, 14. Dezember 2005 19:34
> > An: MyFaces Discussion
> > Betreff: Re: AW: Dynamic Drop Down Lists
> >
> >
> > Thx Andreas.
> >
> > When you make a change in the first select box, does the change
> > automatically propogate to
> > second
> > selectbox without submitting the form (or does the change just affect the
> > component tree)?
> >
> > Mike
> >
> > --- [EMAIL PROTECTED] wrote:
> >
> > > HI Mike!
> > >
> > > I have done it with a ValueChangeListener, it works fine.
> > > I get my Values for the BOX from the Database, because I have to update
> > > them very quickly.
> So
> > > I'm not sure, if you will do that yourself.
> > >
> > > Here is my code, perhaps it helps you:
> > >
> > >
> > > <!--FIRST SELECTBOX-->
> > > <h:selectOneMenu id="mandanten" styleClass="show"
> > > value="#{searchDto.mandant}"
> > > valueChangeListener="#{linker.listnewStandortsForSearch}"
> > > onchange="submit()" rendered="#{searchDto.showAlleAnzeigenMandant}" >
> > > <f:selectItem itemValue="#{searchDto.nullwert}" itemLabel="#{msg.alle}"
> > > />
> > > <f:selectItems value="#{queryHelper.mandanten}"/>
> > > </h:selectOneMenu>
> > >
> > > <!--SECOND SELECTBOX: DEPENDS ON FIRST SELECTBOX-->
> > > <h:selectOneMenu id="standorte" styleClass="show"
> > > value="#{searchDto.standort}"
> > > rendered="#{searchDto.showAlleAnzeigenStandort}">
> > > <f:selectItem itemValue="#{searchDto.nullwert}" itemLabel="#{msg.alle}"
> > > />
> > > <f:selectItems value="#{queryHelper.standorte}"/>
> > > </h:selectOneMenu>
> > >
> > > //HERE IS THE VALUECHANGEMETHOD:
> > >
> > > public void listnewStandortsForSearch(ValueChangeEvent event) {
> > >
> > > qh = (QueryHelper) FacesUtil.getManagedBean("queryHelper");
> > > searchDto = (SearchDto) FacesUtil.getManagedBean("searchDto");
> > > Long newvalue = null;
> > >
> > > // Überprüfung ob Wert der Mandanten Combobox einen anderen
> > > Wert als 0
> > > // (=Alle Anzeigen) liefert
> > > if (((Long) event.getNewValue()).compareTo(new Long(0)) != 0) {
> > > newvalue = (Long) event.getNewValue();
> > > searchDto.setMandant(newvalue);
> > >
> > > }
> > > else {
> > > searchDto.setMandant(new Long(0));
> > > }
> > >
> > > //CALL METHOD WHICH TAKES THE VALUES FOR THE 2nd BOX OUT OF THE
> > > DATABASE, DEPENDING ON THE
> > > SELECTION OF THE FIRST BOX.
> > > try {
> > > qh.liststandorts(newvalue);
> > > }
> > > catch (Exception e) {
> > > // TODO Auto-generated catch block
> > > e.printStackTrace();
> > > }
> > >
> > >
> > > //NOT SO INTERESSTING FOR YOU:
> > > if (event.getComponent().getId()
> > > .equalsIgnoreCase("newpartnerMandanten")) {
> > > String viewId = "/newpartner.jsp";
> > > FacesContext context =
> > > FacesContext.getCurrentInstance();
> > > UIViewRoot view =
> > > context.getApplication().getViewHandler()
> > > .createView(context, viewId);
> > > view.setViewId(viewId);
> > > context.setViewRoot(view);
> > > context.renderResponse();
> > > }
> > > else {
> > > String viewId = "/search.jsp";
> > > FacesContext context =
> > > FacesContext.getCurrentInstance();
> > > UIViewRoot view =
> > > context.getApplication().getViewHandler()
> > > .createView(context, viewId);
> > > view.setViewId(viewId);
> > > context.setViewRoot(view);
> > > context.renderResponse();
> > > }
> > >
> > > }
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von: Mike Duffy [mailto:[EMAIL PROTECTED]
> > > Gesendet: Mittwoch, 14. Dezember 2005 09:37
> > > An: [email protected]
> > > Betreff: Dynamic Drop Down Lists
> > >
> > >
> > > Is there any way to create dynamic drop down lists in JSF without using
> > > AJAX?
> > >
> > > Without JSF there are JavaScript techniques that can be used to
> > > dynamically change a drop
> down
> > > list (e.g., based on the selection of drop down list A, the values ion
> > > drop down list B are
> > > populated by an onclick function),
> > >
> > > However, with JSF, the changes made in JavaScript do not correspond to
> > > the values in the
> > > component
> > > tree on the server, so an error is thrown. I've tried to update the
> > > component through a
> > > "valueChangeListener", but this also generates an error.
> > >
> > > Has anyone found a way to do this in JSF? Can you send a link with an
> > > example? I Googled
> > with
> > > no
> > > success.
> > >
> > > Thx.
> > >
> > > Mike
> > >
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