I am upgrading from 1.5.1 to 1.6 and, while trying to use the
inheritance system from Prototype, I'm a little puzzled on how the
implementation was designed.
Let say I have this object :
var baseObj = Class.create({
initialize: function() {
this.foo = function() { alert( "Hello world!" ); };
}
});
And this child object extending baseObj :
var childObj1 = Class.create(baseObj, {
initialize: function() {
this.bar = function() { alert( "bleh" ); };
}
});
In this implementation, the method childObj1.foo(); is not a
function... as it is a "private" member in the base class.
If I do this :
var childObj2 = Class.create();
Class.inherit(childObj2, baseObj); // even if I add a third
parameter called "base"
Then Prototype causes an error when executing "new childObj2();"
Now, this is the piece of code that I was using prior to Prototype
1.6 :
/**
* Inheritance support
*
* Source :
http://www.someelement.com/2007/03/multiple-inheritance-with-prototypejs.html
*
* Usage (simple) :
*
* var Class1 = Class.create();
* ....
* var Class2 = Class.create();
* Object.inherit(Class2, Class1);
* Object.extend(Class2, {
* initialize: function() {
* this.base();
* ....
* }
* } );
*
* Usage (multiple) :
*
* var Class3 = Class.create();
* Object.inherit(Class3, Class1, "baseClass1"); // baseClass1 =
constructeur Class1
* Object.inherit(Class3, Class2, "baseClass2"); // baseClass2 =
constructeur Class2
* Object.extend(Class3, {
* initialize: function() {
* this.baseClass1();
* this.baseClass2();
* ...
* }
* } );
*
*/
Object.inherit = function(subClass, baseClass, baseFuncName) {
function inheritance() {}
inheritance.prototype = baseClass.prototype;
Object.extend(subClass.prototype, new inheritance());
subClass.prototype.constructor = subClass;
if (!baseFuncName || baseFuncName == "")
baseFuncName = "base";
subClass.prototype[baseFuncName] = baseClass.prototype.initialize;
};
Which works great and can support multi inheritances.
What are your thoughts on this ? Thanks.
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