On Jun 25, 1:07 pm, Tobie Langel <[EMAIL PROTECTED]> wrote:
> It's unfotunately impossible to make a
> constructor for constructors in JS. So Class isn't a constructor here.
Actually, it is possible. See the code below:
<code>
var Class = function(classDef) {
// this = function() { } // throws error - assigning to 'this' not
allowed (not to mention it would be very ugly)
var theConstructor = function() {
this.initialize.apply(this, arguments);
}
// add classDef to the definition of the class (add all elements
of classDef to 'this')
Object.extend(theConstructor.prototype, classDef);
// returning class object constructron, instead of Class object
constructor
return theConstructor; // * THE HACK *
};
// creating the Animal class - the Class object called Animal
var Animal = new Class({
initialize: function() {
document.write('I am the initializer of Animal object<br />');
},
prop1: 'foo',
say: function() {
document.write('say(): I am the instance method of the Animal
class<br />');
}
});
// Animal class - class methods (static methods)
Object.extend(Animal, {
say: function() {
document.write('say(): I am the class method of the Animal
class<br /
>');
}
});
// creating the Animal object
var my_pet = new Animal();
Animal.say();
my_pet.say();
</code>
The secret is the line marked as * HACK *.
I know, this hack isn't very pretty, but it works in all browsers, I
tested (FF 2.0.0.4, IE6, Opera9, Safari3beta3.0.2). I've checked on
Windows only. Ergo - it IS possible for constructor, to return the
constructor :-)
Full working example:
http://dawid.krysiak.net.pl/webdev/js/21.js.constructors.for.constructors.html
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