Comments on: Object.Event: Event model for all JS Objects

By: parag

parag — Tue, 10 Jul 2007 05:54:46 +0000

Nice work dude.

By: Ken

Ken — Fri, 22 Jun 2007 09:00:27 +0000

(to the Moo experts) how does the Moo observer implementation compare to the YUI observer implementation?

By: Todd

Todd — Thu, 21 Jun 2007 12:42:59 +0000

Its news to Prototype users. Keep up the great work Ryan.

By: Ryan Johnson

Ryan Johnson — Thu, 21 Jun 2007 05:36:36 +0000

But this one goes to 11…

By: gonchuki

gonchuki — Wed, 20 Jun 2007 23:52:57 +0000

@Ryan et al
I know what this code does, we (mootools users) were just saying this has already been part of moo for a long time and has the same functionality
(yes Ryan, just apply $extend to ‘myClass’ instead of ‘testClass’ from my pastie and that covers your second point of applying the Events to just one instance.)
Just to keep things clear, this is no bashing @ Ryan, it’s just telling this is not breaking news neither you should necessarily depend on this code to apply events on any object of your code. (except that it’s a nice tiny piece of js)

By: yaiwasright

yaiwasright — Wed, 20 Jun 2007 20:32:38 +0000

@gonchuki – Ryan Johnson’s code can do the same thing on regular objects via Object.Event.extend(myStaticObject);

By: Ryan Johnson

Ryan Johnson — Wed, 20 Jun 2007 19:35:47 +0000

Maybe this could clear it up a little bit. Object.Event can register observers in three ways:

1) to “static” objects (in Java or PHP you’d be naming the members all static because you’re never going to create an instance of the class)
2) to instance objects (anything that was created by calling new Whatever())
3) to all instances of a class (all instances created by new Whatever())

That was far from the most elegant explanation, but does that clear up confusion for folks?

By: gonchuki

gonchuki — Wed, 20 Jun 2007 16:12:21 +0000

@ithink:
let me remember you that i said *any* object.
a Class is an object, and as such you can $extend it with whatever you want, that includes Events.
what may confuse you is that in moo a Class already has an ‘implement’ method as described in Valerio’s link to the docs, nevertheless the $extend approach is still applicable in this case.
http://pastie.caboo.se/72065
test it, enjoy it :)

By: ithink

ithink — Wed, 20 Jun 2007 12:33:45 +0000

@ gonchuki – I think Ryans approach works on both classes and objects.

By: Jordan

Jordan — Wed, 20 Jun 2007 06:01:58 +0000

How is this a resemblance of Dojo? Dojo’s event system is based on AOP. The event model mentioned in this article looks just like the traditional observer-dispatcher pattern.

By: Ryan Johnson

Ryan Johnson — Wed, 20 Jun 2007 02:12:26 +0000

The Mootools Event class is indeed pretty similar. I think the class & instance observation differentiates it a little bit, but it’s pretty similar overall. I hadn’t seen that before today despite having used mootools on a few smaller projects.

By: gonchuki

gonchuki — Wed, 20 Jun 2007 01:30:56 +0000

in moo you can even have ANY object to be an Event-driven object, not only classes have that ability.

it’s as simple as this:
$extend(myDummyObject, new Events)

i’m already developing lots of stuff based on this approach.

By: mooforu

mooforu — Tue, 19 Jun 2007 20:13:54 +0000

I stand corrected. 8)

By: Valerio

Valerio — Tue, 19 Jun 2007 19:29:50 +0000

Yes, it does.

MooTools has Class Events: http://docs.mootools.net/Class/Class-Extras.js#Events

By: nomooforu

nomooforu — Tue, 19 Jun 2007 18:37:49 +0000

No I don’t believe moo does. $(myElement).addEvent() and $().fireEvent() are tied to the DOM element and not any Object.

By: Rick

Rick — Tue, 19 Jun 2007 18:12:01 +0000

MooTools has something similar. Really, really similar.

By: theIntuitionist

theIntuitionist — Tue, 19 Jun 2007 17:16:14 +0000

Hi Ryan! Well, your post answer’s my question. I wonder if you could make an alternate syntax for your library that mimics the watch syntax. A lot of Prototype functions have alternate names….

By: Ryan Johnson

Ryan Johnson — Tue, 19 Jun 2007 17:13:10 +0000

watch is great, but mozilla only the last time I checked. Have others caught up?

By: theIntuitionist

theIntuitionist — Tue, 19 Jun 2007 17:12:03 +0000

I like the look of this, but I wonder if the ‘watch’ keyword isn’t a simpler way of achieving the same effect?

By: Adam Sanderson

Adam Sanderson — Tue, 19 Jun 2007 15:57:18 +0000

Looks really handy. I’m going to keep this is mind :)