Hi!
Can anybody please share some ideas or guess why the selectedIndex property
value of my session-scoped Backing-Bean TabChangeListenerBacking is
different when the value is retrieved by a lookup of the Backing-Bean? Any
help would by highly appreciated...
public void setSelectedIndex(Integer index) {
this.selectedIndex = index;
System.out.println("this.selectedIndex before lookup = " +
this.selectedIndex); // selectedIndex is 1
// getting a reference to this Backing-Bean
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
ValueBinding binding =
app.createValueBinding("#{TabChangeListenerBacking}");
TabChangeListenerBacking backing =
(TabChangeListenerBacking)binding.getValue(context);
System.out.println("backing.selectedIndex = " + backing.selectedIndex);
// selectedIndex is null ?!
System.out.println("this.selectedIndex after lookup = " +
this.selectedIndex); // selectedIndex is 1
}
Regards,
Matthias
> -----Ursprüngliche Nachricht-----
> Von: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Auftrag
> von Matthias Kahlau
> Gesendet: Samstag, 18. Februar 2006 00:31
> An: MyFaces Discussion
> Betreff: AW: Problem with panelTabbedPane's selectedIndex memory
>
>
> Hi!
>
>
> I did some further investigations and could limit the possible causes. The
> Backing-Bean's selectedIndex property is 'null' only when a Backing-Bean
> lookup is performed to read the property value (the Backing-Bean is in
> session-scope!).
>
> Example with logging output in the property's setter method
> (please note the
> comments):
>
>
> public void setSelectedIndex(Integer index) {
> this.selectedIndex = index;
>
> System.out.println("this.selectedIndex before lookup = " +
> this.selectedIndex); // e. g. 1
>
> TabChangeListenerBacking backing =
> (TabChangeListenerBacking)BackingBeanManager.lookup(
> Constants.TABCHANGE_LISTENER_BACKING); // a reference to this
> Backing-Bean
>
> System.out.println("backing.selectedIndex = " +
> backing.selectedIndex);
> // null
>
> System.out.println("this.selectedIndex after lookup = " +
> this.selectedIndex); // still 1
>
> }
>
>
> Do you know what might cause this discrepancy? It causes my
> panelTabbedPane's selectedIndex memory not to work...
>
>
>
> Regards,
>
> Matthias
>
> > -----Ursprüngliche Nachricht-----
> > Von: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] Auftrag
> > von Matthias Kahlau
> > Gesendet: Mittwoch, 15. Februar 2006 16:21
> > An: Users MyFaces
> > Betreff: Problem with panelTabbedPane's selectedIndex memory
> >
> >
> > Hi!
> >
> >
> > I encounter a strange behaviour with using a Backing-Bean in
> session-scope
> > (TabChangeListenerBacking). It stores the selected index of a
> > panelTabbedPane, which is set by a TabChangeListener.
> >
> > When I change the tabs, I can see that the TabChangeListener
> > works, because
> > logging info showed that the
> TabChangeListenerImpl.processTabChange() and
> > TabChangeListenerBacking.setSelectedIndex() methods are invoked with the
> > correct index.
> >
> > The problem happens when I come back to the panelTabbedPane after
> > leaving it
> > to a page that isn't contained in the panelTabbedPane. When I come back,
> > TabChangeListenerBacking.getSelectedIndex() is invoked to receive the
> > currently selected index, but the value is null.
> >
> > I don't understand why the selected index is 'null', it had been
> > set to the
> > real selected index before, as I could see in the logging output.
> > It's like
> > the TabChangeListenerBacking would forget its state. I tried it with a
> > primitive int variable instead of the Integer before, and the
> int had been
> > '0' instead of 'null', instead of the value that had been set by the
> > TabChangeListenerImpl.processTabChange() before leaving the
> > panelTabbedPane.
> >
> > The TabChangeListenerBacking seems to forget its state after leaving the
> > panelTabbedPane, although it's in session-scope.
> >
> > Does anybody of you have an idea what's going on? I'm clueless.
> > Please have
> > a look at the code snippets below.
> >
> >
> > faces-config:
> > ------------
> >
> > <managed-bean>
> > <managed-bean-name>TabChangeListenerBacking</managed-bean-name>
> >
> > <managed-bean-class>de.fhzw.portal.umfragesystem.view.utils.tabbed
> > Pane.TabC
> > hangeListenerBacking</managed-bean-class>
> > <managed-bean-scope>session</managed-bean-scope>
> > </managed-bean>
> >
> >
> > panelTabbedPane:
> > ------------------
> >
> > <t:panelTabbedPane
> > selectedIndex="#{TabChangeListenerBacking.selectedIndex}"
> > serverSideTabSwitch="true">
> > ...
> >
> > <t:tabChangeListener
> >
> > type="de.fhzw.portal.umfragesystem.view.utils.tabbedPane.TabChangeLi
> > stenerImpl" />
> >
> > </t:panelTabbedPane>
> >
> >
> > The TabChangeListenerImpl:
> > ---------------------------
> >
> > public TabChangeListenerImpl() {
> > this.backing = (TabChangeListenerBacking)BackingBeanManager.lookup(
> > Constants.TABCHANGE_LISTENER_BACKING);
> > }
> >
> >
> > public void processTabChange(TabChangeEvent tabChangeEvent) {
> > int newIndex = tabChangeEvent.getNewTabIndex();
> > this.backing.setSelectedIndex(new Integer(newIndex));
> > }
> >
> > TabChangeListenerBacking:
> > --------------------------
> >
> > private Integer selectedIndex;
> >
> > public void setSelectedIndex(Integer index) {
> > this.selectedIndex = index;
> > }
> >
> > public Integer getSelectedIndex() {
> > return this.selectedIndex;
> > }
> >
> >
> >
> > Regards,
> >
> > Matthias
> >
>
