> myMethod().  I suspect this has something to do with the "this" scope
> in my anonymous function.

It's true that `this` within the function will not be what it was
outside the function unless you do something to make it so, and
certainly that would need to be fixed if you were going to do this
this way.

But you seem to be assuming that the window load event has not already
happened when your `initialize` function is called.  When are you
calling it?  I'd suggest it would be better to call your `initialize`
function (by creating an instance via `new`) *after* the load has
occurred (from some kind of load event handler [window.load or
dom:loaded]), rather than writing the class code such that it assumes
it will be called before the load is complete.  The latter is
delicate; the class won't work correctly if the page has already been

* * * *
// Where you're defining your class
var MyClass = Class.create({
   initialize: function() {
      this.myField = new Field();
   myMethod: function() {

// You probably have some main "load" function somewhere
document.observe('dom:loaded', function() {
    someAppropriateVarHere = new MyClass();
* * * *

Re your request for bind coding help in your follow-up, there are lots
of examples out there if you look.  Some places to look:


T.J. Crowder
tj / crowder software / com
Independent Software Engineer, consulting services available

On Aug 22, 10:06 pm, Mojito <tokyot...@gmail.com> wrote:
> MyClass = Class.create({
>    initialize: function() {
>       this.myField = null;
>       Event.observe(window, 'load', function() {
>          this.myField = new Field();
>       });
>    },
>    myMethod: function() {
>       alert(this.myField);
>    }
> });
> +++++++++++++++++++++++++++++++
> Field's constructor uses Scriptaculous's sliders, which require an
> element to be already loaded.  That's why I'm only setting
> this.myField when the window has loaded.  I see that my sliders get
> initialized properly, but this.myField is still null when I call
> myMethod().  I suspect this has something to do with the "this" scope
> in my anonymous function.  How do I fix this to do what I intended?
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