Documentation for Action.Listener#handleAction() method?

Vaadin 6 / 7 / 8 Framework UI
1

Hello. I was wondering if someone could tell me what the “sender” and “target” parameters represent in an Action.Listener.

I presume the sender is much like the “source” in a java.util.Event. And I presume that the target in many cases is either null or superfluous?

I could see that the target might represent the node clicked in a tree, or the cell in a table, etc. but beyond these two examples I don’t really know what else it would be.

Thanks,
Laird

2

This is exactly what it’s currently used for (as the Javadoc indicates): indicating which item the action pertains to. One could imagine some other cases, for example: a context menu could be attached to a Panel (or some other ComponentContainer) and use ‘target’ to indicate which component within the Panel was actually clicked.

Best Regards,
Marc

3

Hi.

I don’t know if this message is still active but here is my question:

I can easily identify on which row is an action (using target) but, How can I identify which column is been clicked?

thanks!!!

4

Currently, actions on a Table do not convey information about the column. This is covered by enhancement request
#4312
.

The Action mechanism could use a larger overhaul but I am skeptical about that making it to Vaadin 7.0.

5

Ok, thank you very much Henri…