Saturday' question : what's the difference ?

Hi all,
since it's saturday, I'll just ask a little question :)
In af:actionCommand, what's the difference between attributes "action" and "actionListener"
Since in either way you call a method in some bean, process code and do stuff. The only difference I see is that one return a String that gives navigation outcome, the other one has an ActionEvent has a parameter. However, you can do the very same thing with these to : get the action source, and navigate.
Why two attributes ? What happens when you got the two filled in in a unique component ?
No urgence here :)
Regards
Luc-

You have waaaay too much time on your hands if this is what you think about on Saturdays ;-) Oh, it's Sunday here, so apparently I have way too much time on my hands too!
I agree it is confusing, when teaching JSF my students get confused all the time no matter how many times I clarify it.
The simple rule is the action attribute is meant to be reserved for navigation rules (be they statically specified or dynamically derived from a backing bean String method), while the actionListener attribute firing code after the user activates a command control. The fact that you can cause navigation programmatically from the actionListener is neither here nor there, because you can in fact cause navigation from many different parts of the framework.
In addition the action and actionListener attributes are evaluated at different parts of the JSF lifecycle too, which is important to know to understand if the actionListener code fires before/after navigation.
As a JSF QA doing a review of your code, if I discovered you doing navigation in the actionListener rather than the action I'd have to question why you've gone with the non-standard approach as it will be a surprise and inconsistency for new JSF programmers on your team to pick up. This is not to say it's wrong in all cases, but I'd want to know a valid reason why you've done it. In addition the JDev IDE assists you in a number of cases with navigation via the action attribute at design time, but not so with the actionListener.
So in summary it's just the way it is, don't get too hung up on it.
I'm not that sure what you mean by "What happens when you got the two filled in in a unique component?"
Hope this helps.
Cheers,
CM.

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0xffffff80793cb660 : 0xffffff7f81795842
0xffffff80793cb680 : 0xffffff7f8175f220
0xffffff80793cb6c0 : 0xffffff7f8175c02f
0xffffff80793cb6f0 : 0xffffff7f817c4c3e
0xffffff80793cb770 : 0xffffff7f817af44b
0xffffff80793cb7d0 : 0xffffff7f817af846
0xffffff80793cb820 : 0xffffff7f817afabb
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Best regards,
Bala

Simple question: White vs. Black Iphone 4 - what are the differences? Some say that white is thinner with different camera. Some say white is "faster"?

Simple question: White vs. Black Iphone 4 - what are the differences? Some say that white is thinner with different camera. Some say white is "faster"?

White iPhone 4 vs. Black iPhone 4: Do They Have Different Cameras ...
The white iPhone: Does size matter? | iPhone Atlas - CNET Reviews

Saturday' question : what's the difference ?

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