Rails spinoffs - Aug 2005 - extend question

Is it possible to call the super class''s version of a function from a
subclass?

SuperClass = Class.create();
SuperClass.prototype = {
   initialize: function(){
      this.varA = '''';
      this.varB = '''';
   }
}

SubClass = Class.create();
SubClass.prototype = (new SuperClass()).extend({
  initialize: function(somevar) {
    this.somevar = somevar;
  }

});
-- 
Ryan P. Miller
ryan@numinalabs.com

On 10/08/05, Ryan Miller <ninjascience@gmail.com>
wrote:
> Is it possible to call the super class''s version of a function
from a subclass?
Not with Class.create and Object.extend, but Douglas Crockford
describes a way to get classical inheritance in
http://www.crockford.com/javascript/inheritance.html

Bye,
Martin

> On 10/08/05, Ryan Miller <ninjascience@gmail.com> wrote:
>> Is it possible to call the super class''s version of a function
from a
>> subclass?
>
> Not with Class.create and Object.extend, but Douglas Crockford
> describes a way to get classical inheritance in
> http://www.crockford.com/javascript/inheritance.html
I don''t know if this was resolved or what, but here was my (very quick 
and hardly-tested) solution:

   SnapDraggable = Class.create();
   Object.extend(Object.extend(SnapDraggable.prototype, 
Draggable.prototype), {
     initialize: function(element) {
       var options = Object.extend({
         gridSize:10
       }, arguments[1] || {});

       Draggable.prototype.initialize.call(this, element, options);

     },
     draw: function(event) {
       var pointer = [Event.pointerX(event), Event.pointerY(event)];
       var offsets = Position.cumulativeOffset(this.element);
       offsets[0] -= this.currentLeft();
       offsets[1] -= this.currentTop();
       var style = this.element.style;

       var gridSize = this.options.gridSize;
		
       if((!this.options.constraint) || 
(this.options.constraint==''horizontal''))
         style.left = (Math.round((pointer[0] - offsets[0] - 
this.offsetX)/gridSize)*gridSize) + "px";
       if((!this.options.constraint) || 
(this.options.constraint==''vertical''))
         style.top  = (Math.round((pointer[1] - offsets[1] - 
this.offsetY)/gridSize)*gridSize) + "px";
       if(style.visibility=="hidden") style.visibility = "";
// fix
gecko rendering
     }
   });


-- Michael Daines