observable

Simple abstract solution for observable pattern

##Usage

Attach the methods on / off / trigger on your observable object. Feel free to use some inheritance mechanism. No need to initialize the private fields.

Basically use on to attach a function to callback when the trigger method is called. Use off to remove the listener.

####parameters

The on method support the following syntax

observable.on( event [, data ] , function [, context ] ); 

• event if a string, it can have a postfix, separated with ":" ( for example "change:title" ).
• data can be anything but a function, it will be added to the callback arguments.
• function is the callback function
• context is the context of the callback function

The off method support the same syntax.

It additionnaly accepts theses too :

 observable.off( event );    // remove the events related to the event name 
 observable.off( context );  // remove the events related to the context 
 observable.off(  ); 	     // remove all the events

####postfix Event with a postfix will be triggered as well as one without.

"change:title" will be trigger by trigger("change")

They are remove as well as the one without

off( "change" ) will also remove the "change:title" events, but off("change:title") will off course only remove this specific event