Which Javascript AOP library do you use, and what are its key features ?
+3
A:
Here is what I found until now :
- dotvoid's implementation, clean syntax, nice to use, the article is a good introduction on why/how to use the given code, supports introductions, but is bugged,
- Dojo has what seems to be a good built-in implementation in dojox, here is a nice introduction on how to use it,
- there is a plugin for jQuery, jquery-aop, with a rougher syntax, passing objects and methods in a javascript object,
- AspectJS with an even rougher syntax (need to pass type of pointcut as arguments to a single method)
Like I said, dotvoid's code did not work. I corrected a little and got something that seems to work better :
InvalidAspect = new Error("Missing a valid aspect. Aspect is not a function.");
InvalidObject = new Error("Missing valid object or an array of valid objects.");
InvalidMethod = new Error("Missing valid method to apply aspect on.");
function doBefore(beforeFunc,func){
return function(){
beforeFunc.apply(this,arguments);
return func.apply(this,arguments);
};
}
function doAfter(func, afterFunc){
return function(){
var res = func.apply(this,arguments);
afterFunc.apply(this,arguments);
return res;
};
}
Aspects = function(){};
Aspects.prototype={
_addIntroduction : function(intro, obj){
for (var m in intro.prototype) {
obj.prototype[m] = intro.prototype[m];
}
},
addIntroduction : function(aspect, objs){
var oType = typeof(objs);
if (typeof(aspect) != 'function')
throw(InvalidAspect);
if (oType == 'function'){
this._addIntroduction(aspect, objs);
}
else if (oType == 'object'){
for (var n = 0; n < objs.length; n++){
this._addIntroduction(aspect, objs[n]);
}
}
else{
throw InvalidObject;
}
},
addBefore : function(aspect, obj, funcs){
var fType = typeof(funcs);
if (typeof(aspect) != 'function')
throw(InvalidAspect);
if (fType != 'object')
funcs = Array(funcs);
for (var n = 0; n < funcs.length; n++){
var fName = funcs[n];
var old = obj.prototype[fName];
if (!old)
throw InvalidMethod;
var res = doBefore(aspect,old)
obj.prototype[fName] = res;
}
},
addAfter : function(aspect, obj, funcs) {
if (typeof(aspect) != 'function')
throw InvalidAspect;
if (typeof(funcs) != 'object')
funcs = Array(funcs);
for (var n = 0; n < funcs.length; n++)
{
var fName = funcs[n];
var old = obj.prototype[fName];
if (!old)
throw InvalidMethod;
var res = doAfter(old,aspect);
obj.prototype[fName] = res;
}
},
addAround : function(aspect, obj, funcs){
if (typeof(aspect) != 'function')
throw InvalidAspect;
if (typeof(funcs) != 'object')
funcs = Array(funcs);
for (var n = 0; n < funcs.length; n++)
{
var fName = funcs[n];
var old = obj.prototype[fName];
if (!old)
throw InvalidMethod;
var res = aspect(old);
obj.prototype[fName] = res;
}
return true;
}
}
subtenante
2009-06-17 08:00:10
Does the code somehow work in Internet Explorer? As my tests failed, I googled around and it seems that IE doesn't have a "prototype"-property...
Heinrich Ulbricht
2009-06-29 13:08:19
I've been running tests on this on IE7. Works fine. Lower versions untested though.
subtenante
2009-06-29 13:44:23