Rails spinoffs - Feb 2007 - Prototype proposal: Custom Events / Messaging

hi all,

during developing you encounter several problems. one that frequently
occurs to me while working on rather complex user interfaces is that all
you on page modules (tag clouds, friend lists, you name it..) are to an
extend interlocked with each other. the more complex your ui gets the
more each module has to know about the others and the more hard it gets
to maintain your code.

on most window manager systems like gnome and the like (even windows)
you have a messaging mechanism for that. objects can send out a message
(ie: ''deleted a file'') and other objects can subscribe to such
a message.

this very much works like the javascript Event object and the prototype
observing. so i thought why not extend the Event object even more and
include the possibility to register new events and throw them, and
extend the methods observe() and stopObserving() to enable client
modules to observe these new custom events.

I know that the dojo toolkit has a similar thing going. but so far dojo
didn''t feel like the right tool for the job for me (no flamewars
please).

attached to this mail you can find my solution and a (admittedly very)
brief demo. some more ''documentation'' is in the head comment
of the
event.js file.


I hope you agree with me that this is a simple, clean and good solution
to my problem. if you do I would very much appreciate to share this code
with the prototype community and hereby ask for the inclusion of the
attached code.


cheers
/christian

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Hello Christian,

Thanks for your proposal.  However, it would be better posted on the 
Prototype-Core group, which is where evolutions of Prototype are 
discussed.  Spinoffs is mostly for informal tech support on the libs.

There are actually works in the pipe already, mostly by Andrew Dupont, 
on a custom event mechanism for Prototype, which is very similar in 
concept to what you suggest.  So far, it''s been mostly discussed in 
Prototype Core''s Basecamp home (which is private to Core members), but 
it will likely surface on the Prototype Core list at some point, 
allowing for external review.

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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