Also, check out:
http://www.someelement.com/2007/03/multiple-inheritance-with-prototypejs.html
This is my rendition of Kevin Lindsey's inheritance model, designed to
support multiple inheritance and play well with prototype.js
For what you're talking about, read the section near the bottom labeled So
how can you override base class methods and make sure that the original base
class method still gets called?
Object.extend works very well as a simple bulk property copying mechanism,
and as such does not need this extra jazz. I really think you're looking for
a true inheritance model, which Object.extend has never been, nor really
should be morphed into, IMHO.
On 5/4/07, Jerod Venema [EMAIL PROTECTED] wrote:
Greetings!
Nice bit of code there! You may want to check out this:
http://www.ivy.fr/js/extend/index.html
if you're going down that road anyway...
-Jerod
On 5/4/07, Tomasz R. [EMAIL PROTECTED] wrote:
Hi,
I've recently started using prototype.js, but I've been doing AJAX
for long time now.
I've inspected the prototype.js code, and I think I've got an
interesting addition to the Object.extend.
I might have reinvent the wheel here, so if it's nothing new please
give me some pointers as to how to accomplish the same with the native
prototype.js code.
Basically, I was looking for a way to call the original function of an
extended object. Here is my modification:
// a new version of extend
Object.extend2 = function(destination, source) {
for (var property in source) {
if(destination[property]) {
if(!destination['__super']) {
destination['__super'] = {};
}
destination['__super'][property] =
destination[property];
}
destination[property] = source[property];
}
return destination;
}
// code to be executed to see the behavior.
var a = Class.create();
a.prototype = {
initialize: function(name,link) {
this.elements = new Object();
},
test: function() {
alert('hello');
}
}
var b = Class.create();
b.prototype = Object.extend2(new a(), {
initialize: function() {
},
test: function() {
this.__super.test();
alert('hello2');
}
}
)
var B = new b();
B.test();
// END
after executing this code, you should first see the hello alert, and
then hello2.
I think this is an interesting addition, since I find myself often in
need to be able to access methods of the original object, without
having to copy/paste it's behavior to the new one.
--
Ryan Gahl
Software Architect
WebWidgetry.com / MashupStudio.com
Future Home of the World's First Complete Web Platform
Inquire: 1-262-951-6727
Blog: http://www.someElement.com
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