On Thu, Jun 11, 2009 at 7:05 AM, Onno Scheffers <o...@piraya.nl> wrote:
> ${} is a shortcut to make it very easy to insert some property-value into
> your template without having to use a component for it. There are typically
> 3 ways to insert some content into your page:
>
> 1. The way you're using components, keeping most of the configuration in
> the
> Java class:
> <h1 t:id="title">Some title</h1>
>
> @Component(parameters = { "value=prop:myTitle" })
> private Output output;
>
>
> 2. Use and configure the component straight from within your template:
> <h1 t:type="Output" t:value="prop:myTitle">Some title</h1>
>
>
> 3. The easiest way is using the expansion:
> <h1>${myTitle}</h1>
>
You can also say ${message:my-key} to retrieve a localized key, or use any
other binding prefix.
>
>
> I use option 1 all the time. It makes refactoring much easier and keeps the
> templates clean for the designers. It takes more code though. This works
> for
> all components.
>
> Option 2 is typically great for quick prototyping but a lot of non-standard
> markup is added to the template which might confuse web-designers. It works
> for all components.
>
> Option 3 is a shortcut that makes it even easier to insert some property
> value directly into your page. It only works for inserting content
> retrieved
> from a property on your page.
>
> More information:
> http://tapestry.apache.org/tapestry5/guide/templates.html
>
>
> regards,
>
> Onno
>
>
> On Thu, Jun 11, 2009 at 3:38 PM, Kai Weber <kai.we...@glorybox.de> wrote:
>
> > Hi,
> >
> > I am a Tapestry beginner. I am far from knowing all the internals. I use
> > the PageLink component in one of my as follows:
> >
> > @Component(id="backLink",
> > parameters={
> > "page=${backLink}",
> > "context=backLinkContext",
> > "anchor=${prev.getUniqueIdentifier()}"})
> > private PageLink backLink;
> >
> > My question is now
> >
> > What does the ${...} do?
> >
> > I fail to see what this means: If I replace
> "context=prop:backLinkContext"
> > with "context=${backLinkContext}" I get a different link than expected.
> If I
> > replace "page=prop:backLink" with "page=${backLink}" I get no different
> > link. Why?
> >
> > Kai
> >
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> >
>
--
Howard M. Lewis Ship
Creator of Apache Tapestry
Director of Open Source Technology at Formos
