Geoff,
My guess is it's the for..in that's doing you in. Check out the docs
on Array
(http://www.prototypejs.org/api/array) and Enumerable
(http://www.prototypejs.org/api/enumerable)
for details. For..in does not iterate the elements of an array; it
iterates the properties of an object. These seem like the same thing
in some JavaScript implementations (but not all), but that stops
happening when Prototype adds its syntactic sugar to Array.
Separately: You are relying quite heavily on semicolon insertion,
which can tend to obscure odd bugs. It's best to always explicitly
use semicolons, never to rely on JavaScript to guess correctly where
they should go. There are good maintainability reasons for this, as
well as the pragmatic reason that you pretty much can't use minimisers
on your code if you don't put semicolons in.
Hope this helps,
--
T.J. Crowder
tj / crowder software / com
On Apr 19, 8:49 am, geoffcox <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Can anyone please see why as soon as add a link to prototype.js I get
> an error message
>
> F["B" + Next[J]] has no properties
>
> I have tried changing the variable names but still get the error
> message.
>
> Help! Cheers Geoff
>
> var Arry = [
> /* State 0 : */ [1,2],
> /* State 1 : */ [3],
> /* State 2 : */ [3],
> /* State 3 : */ [4,5],
> /* State 4 : */ [6],
> /* State 5 : */ [6],
> /* State 6 : */ [7,8],
> /* State 7 : */ [9],
> /* State 8 : */ [9],
> /* State 9 : */ [10,11]]
>
> var result =new Array();
> var test_num=1;
> function A(f) {soundManager.play('mySound'+test_num ,'../assets/audio-
> group1/Track' + (+test_num + 22) + '.mp3'); }
> function B(f) { result[test_num] = "same"; test_num++;}
> function C(f) { result[test_num] = "different";test_num++; }
>
> DoSpecificTask = [A, B, C, A, B, C, A, B, C, A, B, C]
>
> function Fn(Arg) {
> var F = Arg.form, State, J, Next
> State = Arg.value
> for (J=0 ; J<12 ; J++) F["B"+J].disabled = "disabled" // clear all
> Next = Arry[State]
> for (J in Next) F["B"+Next[J]].disabled = "" // set some
> DoSpecificTask[State](F)
>
> }
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