If you really wanted to avoid bind you could just use closures within
the initialize method
var Sub4 = Class.create(Super4, {
baz: "bat",
initialize: function () {
var self = this;
var f = function () {
alert("Class:"+self.fu+self.baz);
};
document.observe("click",f);
}
});
On Aug 4, 3:35 am, Cédric <[email protected]> wrote:
> On 3 août, 22:38, Matt Foster <[email protected]> wrote:
>
> > Regardless of the JS framework. A closure is necessary for attaching
> > class methods to a particular instance and preserve the instance
> > reference via the "this" keyword.
>
> This is automatic with the regular "Constructor" syntax. Defining a
> function as an object method inside a constructor creates a closure,
> so we can use #bind at the same time as the definition.
>
> The point is, Class.create acts like a prototype more than as a
> constructor. I never really thought of that. So I can't bind to my
> object instance inside Class.create. And I guess that what acts as a
> constructor in Class is the initialize method... So, maybe, I should
> define f inside initialize, something like:
>
> var Sub4 = Class.create(Super4, {
> baz: "bat",
> initialize: function () {
> this.f = function () {
> alert("Class:"+this.fu+this.baz);
> }.bind(this);
> document.observe("click", this.f);
> }
>
> });
>
> Is there a cost to operating that way? I guess I won't be able to use
> Class.addMethods...
>
> > I thought Function.bind was pretty clean myself, but I guess you've
> > got the sweet tooth for the syntax.
>
> I think #bind is awesome :) It's the "bind the function in the
> initializer" that bothers me, when I compare it to the standard syntax
> "bind the function at its definition".
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