Recently I’ve been working heavily in javascript to build an application. I’ve learnt a hell of a lot about structuring an application and ideas on good design as well as patterns.
The Situation
When I started building the application, I wanted to be able to make it extensible. Everybody loves Extensible, don’t they? Well, I know I’m a fan of customisation. So I wanted to add the option that other developers could easily extend my application. Since I was using xulrunner as the environment, lucky me, I already have an addons library, BUT, that didn’t give me a way of adding functions to events, say when the program starts I wanted to alert “hello”, how would I do it?
The program had a startup function, but my event needed to fire after that ran. So I started thinking of writing a way to add events to functions, what i came out with, was EventJS.
Implementation
EventJS is pretty simple in implementation. It has only four functions, these are:
- bind
- Bind an event to a function
class, event, name, function- unbind
- Unbind an event from a function
class, event, name- trigger
- This fires the event, it’s to be used with in the function, eg. startup
class, event, [args]- change
- This changes the function of the event
class, event, name, function
Get It?
You can get a copy of EventJS from my google code repository, aka here.
License
EventJS by Micheil aka Miksago is licensed under a Creative Commons Attribution-Share Alike 2.5 Australia License.
Discuss
Feel free to write your opinion on usage and reason for using it or not as comments to this article.
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