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From Steve Shucker <sshuc...@vmsinfo.com>
Subject Re: Tapestry 4 dynamically changing the template
Date Fri, 02 Mar 2007 14:46:48 GMT
You've got two separate problems here:
1) choosing which component to render at runtime without a fixed list of 
2) pulling the template from the database

The first problem is addressed by Michael Henderson's DynamicBlock:

I posted something on the second problem a while ago:


You should be aware that (as far as I know) tapestry cannot remove 
individual pages from its page cache so you can't modify a template and 
see the changes immediately unless you either have page caching turned 
off or you use the reset service to wipe the whole cache.  Neither of 
those are acceptable for a production environment.  The solution I came 
up with versions the templates and calls them by ID.  I have another 
class lying around that keeps track of the most recent component ID for 
a given name.

The really fun stuff was integrating this with the DynamicBlock 
component and our user preference system to produce a component that 
took a user attribute name, looked up that attribute for the current 
user and displayed the correct component.


Moore, Andrew wrote:
> Hi,
> I'm planning on writing a content management system in Tapestry.
> The plan is that the users should be able to write and design their own html
> pages, and then with a simple tapestry reference (with all the properties
> set in a page specification) get all the dynamic content entered into their
> html pages.
> If there was only one template that everybody used this would be simple, but
> as I want each user to be able to design their own template, I'm not sure if
> this is possible.
> As far as I am aware (and I'm a complete newbie to Tapestry) as the .html
> files live inside the WEB-INF directory with the .page files there probably
> isn't an easy way to do this.
> Is there any way at run time of dynamically choosing the template (.html)
> file that is used to generate the page?  - pulling a template name from a
> database?
> Cheers
> Andrew
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