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Posted to users@wicket.apache.org by jy <jy...@gmail.com> on 2007/12/12 23:21:23 UTC
accessing parent model from child component -- redundant markup element using same field
Hello.
A newbie here.
Is there a way for a child component to get access to the model added
to the parent component? I have two labels in the child component
that use the same model field. Since each label requires unique id, I
can't use CompoundPropertyModel, can i? I saw the example with
BoundCompoundPropertyModel, but that needs access to the model. So
how can i get the model that was added to the parent?
I stepped into child component in debugger. Both getParent() and
getModel() return null.
Thanks in advance,
J
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Re: accessing parent model from child component -- redundant markup element using same field
Posted by Igor Vaynberg <ig...@gmail.com>.
how exactly does this break encapsulaton?
the only drawback to providing the model if you dont use it is that
you have to store a reference to it.
-igor
On Dec 12, 2007 3:36 PM, jy <jy...@gmail.com> wrote:
> Great. Thx.
>
> I also "resolved" this problem by using the constructor that takes
> model as the second argument.
>
> It seems both approaches remove encapsulation. i.e. The parent must
> know ahead of time that child needs the handle to the model, and must
> provide explicitly.
>
> Is there any drawback (in terms of performance, resource usage, etc)
> for providing the model to the child regardless it needs it or not?
>
> --JY
>
>
>
>
> On Dec 12, 2007 2:59 PM, Igor Vaynberg <ig...@gmail.com> wrote:
> > add(new Label("label") {
> > protected IModel initModel() { return getParent().getModel(); }
> > });
> >
> > -igor
> >
> >
> > On Dec 12, 2007 2:21 PM, jy <jy...@gmail.com> wrote:
> > > Hello.
> > >
> > > A newbie here.
> > > Is there a way for a child component to get access to the model added
> > > to the parent component? I have two labels in the child component
> > > that use the same model field. Since each label requires unique id, I
> > > can't use CompoundPropertyModel, can i? I saw the example with
> > > BoundCompoundPropertyModel, but that needs access to the model. So
> > > how can i get the model that was added to the parent?
> > >
> > > I stepped into child component in debugger. Both getParent() and
> > > getModel() return null.
> > >
> > > Thanks in advance,
> > > J
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> > > For additional commands, e-mail: users-help@wicket.apache.org
> > >
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
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> >
> >
>
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Re: accessing parent model from child component -- redundant markup element using same field
Posted by jy <jy...@gmail.com>.
Great. Thx.
I also "resolved" this problem by using the constructor that takes
model as the second argument.
It seems both approaches remove encapsulation. i.e. The parent must
know ahead of time that child needs the handle to the model, and must
provide explicitly.
Is there any drawback (in terms of performance, resource usage, etc)
for providing the model to the child regardless it needs it or not?
--JY
On Dec 12, 2007 2:59 PM, Igor Vaynberg <ig...@gmail.com> wrote:
> add(new Label("label") {
> protected IModel initModel() { return getParent().getModel(); }
> });
>
> -igor
>
>
> On Dec 12, 2007 2:21 PM, jy <jy...@gmail.com> wrote:
> > Hello.
> >
> > A newbie here.
> > Is there a way for a child component to get access to the model added
> > to the parent component? I have two labels in the child component
> > that use the same model field. Since each label requires unique id, I
> > can't use CompoundPropertyModel, can i? I saw the example with
> > BoundCompoundPropertyModel, but that needs access to the model. So
> > how can i get the model that was added to the parent?
> >
> > I stepped into child component in debugger. Both getParent() and
> > getModel() return null.
> >
> > Thanks in advance,
> > J
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> > For additional commands, e-mail: users-help@wicket.apache.org
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
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Re: accessing parent model from child component -- redundant markup element using same field
Posted by Igor Vaynberg <ig...@gmail.com>.
add(new Label("label") {
protected IModel initModel() { return getParent().getModel(); }
});
-igor
On Dec 12, 2007 2:21 PM, jy <jy...@gmail.com> wrote:
> Hello.
>
> A newbie here.
> Is there a way for a child component to get access to the model added
> to the parent component? I have two labels in the child component
> that use the same model field. Since each label requires unique id, I
> can't use CompoundPropertyModel, can i? I saw the example with
> BoundCompoundPropertyModel, but that needs access to the model. So
> how can i get the model that was added to the parent?
>
> I stepped into child component in debugger. Both getParent() and
> getModel() return null.
>
> Thanks in advance,
> J
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
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