Thanks for the clarifications. I think it is not a "once per render" case. So
that means I can have a check method in a comp and do this:
<li>
<span jwcid="@Conditional" condition="ognl:someExpression">
<PageLink A>
</span>
<PageLink B></li>
Am I correct? If so, I can use this approach for let's say in my application I
have a comp that generates links for a particular group of authorized users.
The check method determines whether the page containing the comp implements an
interface to get a list of authorized groups, and then the method checks if the
user is in the groups before rendering <PageLink A>. The above snippnet would
do the job if I put it in the comp's template. Yes?
--
waimun
On 8/19/05, Geoff Longman <[EMAIL PROTECTED]> wrote:
> I don't understand why you want to override renderComponent to
> conditionally render individual wrapped components. Indeed since you
> have based your component on BaseComponent, by definition there could
> be *anything* in the body and thus it would not make sense to expect a
> particular comp to exist in there.
>
> The expression you supply to a @Conditional can invoke any old check
> you like, as simple or complex as needed.
>
> If the check you need to do is a "once per render" you can do it in a
> pageRenderListener and cache the result in property that is pulled by
> the expression in the @Conditional.
>
> If its not a "once per render" put the check in a method and call the
> method using the expression. The check method could take parms from
> the expression: ongl:doCheck(something, somethingElse) or it could be
> a no arg method that is smart enough to gather it's required data from
> other properties and return the result of the check.
> ognl:doCheck()
>
> Geoff
>
>
>
>
> On 8/19/05, Waimun Yeow <[EMAIL PROTECTED]> wrote:
> > Hi Geoff,
> >
> > Supposedly, the condition is a bit complex that requires logic checking be
> > done programmatically via code, eg. some business rules and database access
> > to reach a decision on whether <PageLink A> should be rendered. Then, how
> > should I code it in the renderComponent() body? What I am suggesting to do
> > is have writer.begin("li") and then getComponent and render, finally
> > writer.end(). But if this is the case, the static tags and content in the
> > component template would be meaningless since I am producing it from
> > writer.begin().
> >
> > Any advise? I am not facing this scenario now, but I think I would be in
> > this situation in the nearby future.
> >
> > Tks.
> >
> > --
> > waimun
> >
> > On 8/19/05, Geoff Longman <[EMAIL PROTECTED]> wrote:
> > > No need to mess with renderComponent as there is a handy prebuilt
> > > component for such tasks...
> > >
> > > PageLink A will render if someExpression evaluates to true (or any non
> > > null value).
> > >
> > > <li>
> > > <span jwcid="@Conditional" condition="ognl:someExpression">
> > > <PageLink A>
> > > </span>
> > > <PageLink B></li>
> > >
> > > Geoff
> > >
> > > On 8/19/05, Waimun Yeow <[EMAIL PROTECTED]> wrote:
> > > > Thank you so much!
> > > >
> > > > I have another question related to super.renderComponent. It's actually
> > > > not a problem in my application right now, but I am anticipating that
> > > > the following scenario might occur some time later:
> > > >
> > > > Let's suppose:
> > > >
> > > > 1) there are two PageLink components defined in the component spec
> > > >
> > > > 2) in the component template, we have <li><PageLink A><PageLink B></li>
> > > >
> > > > Therefore, a call to super.renderComponent will render all these tags.
> > > > If I wanted to add a logic that selectively render <PageLink A> and
> > > > also the enclosing <li> tag, I would getComponent for <PageLink A> and
> > > > invoke render(). But what about the <li> or the other static stuff (if
> > > > exists) in the component template?
> > > >
> > > > What would be a correct way of doing this?
> > > >
> > > > Thanks again.
> > > >
> > > > --
> > > > waimun
> > > >
> > > > On 8/19/05, Geoff Longman <[EMAIL PROTECTED]> wrote:
> > > > > override renderComponent, do your checks, then call
> > > > > super.renderComponent
> > > > >
> > > > > Geoff
> > > > >
> > > > > On 8/18/05, Waimun Yeow <[EMAIL PROTECTED]> wrote:
> > > > > > Hi,
> > > > > >
> > > > > > I am subclassing BaseComponent, and in the class renderComponent()
> > > > > > method, I would like to render the contents of the component's
> > > > > > template
> > > > > > after some logic checks are performed and determined that the
> > > > > > component
> > > > > > should render.
> > > > > >
> > > > > > How do I do that? I tried to use render() method but I get
> > > > > > stackoverflow exception.
> > > > > >
> > > > > > Please advise.
> > > > > >
> > > > > > Thanks.
> > > > > >
> > > > > > --
> > > > > > waimun
> > > > > >
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