Re: Prototype callbacks: return a value

greenie2600
Tue, 01 Jul 2008 00:38:44 -0000

To elaborate a little:

lucas = processRSS is an expression like any other:

lucas = processRSS
4 + 3
"My name is " + myName
!myBoolean

As with any other expression, it gets simplified first, and the
onComplete property takes on that simplified value.

In the case of the assignment operator (=), the expression simplifies
to the value being assigned (in this case, a reference to the
processRSS function).

Best to avoid this syntax entirely - I''ve seen it used as sugar, but
IMHO it''s just confusing.



On Jun 30, 6:52 am, "Frederick Polgardy"
<f...-SMQUYeM9IBBWk0Htik3J/w@public.gmane.org>
wrote:
> FYI, what you''re doing in this example is setting the value of
lucas to the
> function processRSS immediately, and then handing that value to
Ajax.Request
> as the onComplete handler.  Syntactically it may look like it''s
performing
> the assignment in the callback, but it isn''t.
>
> -Fred
>
>
>
> On Mon, Jun 30, 2008 at 3:51 AM, ljundie
<ljun...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > var lucas = 0;
>
> > function loadRSS() {
> >         var url = "sample_feeds/sample_feeds_TTblog.xhtml";
> >         var myAjax = new Ajax.Request( url, {
>
> >    method: ''get'',
>
> >    parameters: '''',
>
> >    onComplete: lucas = processRSS
>
> >    });
> >         }
>
> --
> Science answers questions; philosophy questions answers.