On Wed, Feb 11, 2009 at 1:23 PM, Ricardo Tomasi <ricardob...@gmail.com> wrote:
>
> Increment/decrement is for variables. You can't use it directly on a
> number. Try '3--'.
>
> Make it simple, if you use subtraction the type conversion is done for
> you:
>
> $index = $('#Index');
> val = $index.val()-1;

Except, as Karl pointed out, val() will return a string.

var val = parseInt($index.val());
$index.val(--val);

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