I'm doing it and it works. I create components from a class that
specificates how to create a template dinamically, so it creates the
template on the fly.
Here is a simplified version of my "findTemplate" method of ITemplateDelegate:
public ComponentTemplate findTemplate(IRequestCycle cycle,
IComponent component, Locale locale) {
//I ask here if it's a page of my magic class
if (component instanceof TemplatelessPage) {
TemplatelessPage page = (TemplatelessPage) component;
//I told the page to create a template
char[] templateChars;
templateChars = page.createTemplate();
//I create a parser for the template
TemplateParser parser = new TemplateParser();
ITemplateParserDelegate delegate = new TemplateParserDelegateImpl(
component, cycle);
//I parse the template
TemplateToken[] tokens;
try {
tokens = parser.parse(templateChars, delegate, null);
} catch (TemplateParseException e) {
throw new RuntimeException(e);
}
ComponentTemplate template = new ComponentTemplate(templateChars,
tokens);
return template;
} else {
return null;
}
}
This was a simplified version.
I've added diferent layouts to a Page, so the same specification can
render in diferent ways.
I've also added cache features, so you don't need to create a template
every time for different instances of the same page.
Tell me if it was usefull.
On 5/13/05, Mark Dillon <[EMAIL PROTECTED]> wrote:
> Perfect! Thank you very much. Are those examples out there anywhere?
> BTW, love Lucene in Action...
>
> Thanks,
> Mark
>
> On 5/13/05, Erik Hatcher <[EMAIL PROTECTED]> wrote:
> > On May 12, 2005, at 11:53 PM, Mark Dillon wrote:
> >
> > > Has anyone out there attempted to dynamically load a page template
> > > from the database at runtime? For instance, imagine I had a model
> > > property on a page specification, and that model had a string property
> > > containing template text. Would it be possible to render this as the
> > > page template (or component template for that matter)? I know this
> > > has been touched on by a few people, but I haven't found any solid
> > > examples for doing it. Just wanted to see if anyone had attempted
> > > this before re-inventing the proverbial wheel...
> >
> > I have done prototype examples of this. The plumbing is in place.
> > In Tapestry 3.0 (and surely 4.0 also) you can create an
> > ITemplateSourceDelegate and register it as an <extension> in
> > your .application file. Any time a template cannot be found in the
> > web application where its supposed to be by default, it will ask your
> > delegate for it.
> >
> > This, in my opinion, is one of Tapestry's greatest (but relatively
> > unknown) strengths!
> >
> > Erik
> >
> >
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> >
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