You can have a look at how it is handled in Archetype Components (an Open Source Framework based on Prototype). It's called MethodBuilder, but this is basically a Facet in AOP.
It does not just add a before and an after for any function of a component, but it also provides some really enjoyable tools like having a "this" bound to the component in all it's function, so you don't have to put ".bind(this)" everywhere when using callbacks. Get more informations at http://archetypejs.org :) 2008/5/16 kangax <[EMAIL PROTECTED]>: > > I have done something similar in Class.addBehavior: > http://github.com/kangax/protolicious/tree/master/class.addbehavior.js > On the other hand, it's actually pretty easy to do this with plain > Function#wrap: > > (function(p){ > p.push = p.push.wrap(function(){ > var args = $A(arguments), proceed = args.shift(); > console.log('before: ' + args); > (function(){ console.log('after: ' + args) }).defer(); > return proceed.apply(proceed, args); > }) > })(Array.prototype); > > It's arguably not as "clean" as your implementation, so some could > definitely find it useful : ) > > - kangax > > On May 14, 12:13 pm, Pat Nakajima <[EMAIL PROTECTED]> wrote: > > I've started putting together a way to specify per-object before/after > > callbacks for any method. Probably not something to go in core, but > > maybe something that would be interesting to core contributors. > > > > There are some examples in a GitHub wiki (http://github.com/nakajima/ > > nakatype/wikis/callbacks), but basically, you specify callbacks like > > so: > > > > var someArray = [1,2,3]; > > > > Callbacks.add(someArray, { > > before: { > > push: function(entry) { > > var msg = 'about to push ' + entry + ' on array: ' + > > this.join(', '); > > console.info(msg); > > } > > }, > > > > after: { > > push: function(entry) { > > var msg = 'just pushed ' + entry + ' on array: ' + > > this.join(', '); > > console.info(msg); > > } > > } > > }); > > > > someArray.push(4); > > > > In addition to adding 4 to someArray, the above code snippet will log > > to the console before and after. > > > > If anybody has any suggestions/criticisms/threats, please do share! > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Prototype: Core" group. To post to this group, send email to prototype-core@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/prototype-core?hl=en -~----------~----~----~----~------~----~------~--~---
