Yes, but the usefulness of my answer largely depends on how clever/efficient you are trying to be doing it.
Now, there is IBinding. The one object to bind them all ;) If you work your way down the type hierarchy you'll find AbstractBinding, which holds the method you care about most - "setObject". This will be called by tapestry when managing all of the page properties "automagically" for you. Some of the magic happens in (for your exact case at least) org.apache.tapestry.enhance.ParameterPropertyWorker. The other half of the work happens in each specific binding implementation that will handle these set/get object calls..(Like ognl bindings, etc..) I'm not sure where you are going with this but I guess you could use the hivemind chain of command service sort of configuration (like I did for org.apache.tapestry.services.ComponentRenderWorker ) to generically call a single interface method for a hivemind configuration point...Then you can contribute as many workers into the chain you like if you decide that you have more than one use for it. Again...Not knowing what you are doing - and taking the exact parameters given I'd probably extend and override the default ParameterPropertyWorker (a hivemind service, so replacing it inline with what Tapestry does already should be easy ) and just override whatever section of code I needed to in that implementation to inject + call my service reference. It may look a little complicated in there at first, but the whole org.apache.tapestry.enhance package is filled with lots of different enhancement works - and most of them inject a service into the object they work on...So finding an easier to follow worker to reference before modifying ParameterPropertyWorker might be easier. Hope that helps. On 10/6/06, Epstein, Ezra <[EMAIL PROTECTED]> wrote:
I've got a component which accepts a parameter. I want to listen (receive a callback) when the parameter is set (bound). Does Tapestry provide such a facility? Thanks, Ezra Epstein
-- Jesse Kuhnert Tapestry/Dojo/(and a dash of TestNG), team member/developer Open source based consulting work centered around dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com