[TAP5-801] Add Trigger component to trigger a component event during rendering

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 5.1.0.5
• Fix Version/s: 5.2.0
• Component/s: tapestry-component-report
• Assignee: Igor Drobiazko
• Reporter: Howard Lewis Ship
• Created: 31/Jul/09 10:12
• Updated: 30/Aug/09 16:16
• Resolved: 30/Aug/09 16:16

Description

It would be nice if it were possible to trigger an arbitrary component event during rendering; this is often useful to add JavaScript to a page (via calls to the RenderSupport environmental).

Currently this can be accomplished using Delegator and providing a Renderable object (as an anonymous inner class) ... but that's ugly, i.e.

<t:delegate to="wireEventHandlers"/>

public Renderable getWireEventHandlers()
{
return new Renderable()
{
public void render(MarkupWriter writer)

{ ... }

};
}

I would rather something like:

<t:triggerevent event="wireEventHandlers"/>

void onWireEventHandlers()
{
...
}

The MarkupWriter could be passed as the event context, for handlers that need to write markup as well as perform other functions.