Javascript - get class owner of a function(method)

Question

there is a way to know what class own a function? Example:

function globalFunc(){
 //alert MyObject
}

function MyObject(){
}
MyObject.prototype.test=function(){
 globalFunc();
}

var o=new MyObject();
o.test();  //alert MyObject

Now im using this workaround:

function globalFunc(){
 alert(globalFunc.caller.__class__);
}

function MyObject(){
}
MyObject.prototype.test=function(){
 globalFunc();
}
MyObject.prototype.test.__class__=MyObject;

var o=new MyObject();
o.test();  //alert MyObject

But there is a big problem, look this:

function globalFunc(){
 alert(globalFunc.caller.__class__);
}

function MyObject(){
}
MyObject.prototype.test=function(){
 var temp=function(){
  globalFunc();
 }
 temp(); 
    /* to simulate a simple closure, this may be for example:
     element.addEventListener("click",temp,false);
    */
}
MyObject.prototype.test.__class__=MyObject;

var o=new MyObject();
o.test();  //alert undefined

So, there is a clear way to obtain this? I know where is the problem(class property is a property of only test and not temp), but i can't add class to temp too.

Thanks.

---

Thanks for reply, some clarification.

Im trying to do a personal framwork OO oriented with private members.

So:

globalFunc is a special function, im using it to get "private" property and i can't call it with call method or passing some arguments, the only arguments im pass is "this":

Example, $() is global

Class({
    public:{
        MyClass:function(){
        },

        setName:function(name) {
            $(this).name=name; //set the private var name
        },
        getName:function(){
            return $(this).name;
        }
    },
    private:{
        name:"UNKNOWN"
    }
})

var o=new MyClass();
o.getName(); // UNKNOWN
o.setName("TEST!!!");
o.getName(); // TEST!!!
o.name; //undefined
$(o).name; //undefined

To works with inheritance, $(), i need to know what class call it and the object of the class.

All works good, but if i need to access a private members in a clousure i must add __class__ property to clouser!! And i not want this!

Thanks again and sorry for my bad english, im not native speaker.

Solution 1

In javascript there are no Classes. Instead several objects can "own" the same function. For example:

function myFun(){
  alert(this.name);
}

function Obj1(){
  this.name = "obj1";
}
Obj1.prototype.fun = myFun;

function Obj2(){
  this.name = "obj2";
}
Obj2.prototype.fun = myFun;
var obj1 = new Obj1();
var obj2 = new Obj2();
obj1.fun();
obj2.fun();

Solution 2

You scenario is not entirely clear but here are some options:-

 function globalFunc()
 {
     alert(this.__class__);
     //Note globalFunc now has access to much more.
 }

 function MyObject(){ }
 MyObject.prototype.test=function(){
   globalFunc.call(this);
 }
 MyObject.prototype.__class__=MyObject;

To add a closure for event handling

MyObject.prototype.test = function(){
   var self = this;
   var elem = //get some element;
   //Not cross-browser but for illustration
   elem.addEventListener('click', fnEvent);
   function fnEvent() { globalFunc.call(self); }
   elem = null
}

Solution 3

I don't understand well what you are trying to do, but here's an idea that could inspire you something.
The "constructor" property helped me well when I was trying to use JS as a OO language.

o.constructor will give you the myObject function reference.

But in my opinion, you should give functional programming a try instead of OO to get the most from Javascript

Comments

[Admin]

Yes..indeed im asking here if someone know another solution.

[Admin]

ps. i cant add class property to temp too.

[Marius]

@CoDEmanX ES6 classes are just syntax sugar. Defining a method in a class is the same as setting the method on the prototype of the constructor