Hi,
You're probably running into equality vs. identity (loose equality vs.
strict equality). The emerging standard for what Array#indexOf is
supposed to do uses strict equality (===), not ==, whereas previously
Prototype used loose equality. This is an issue with strings because
"mpg" !== new String("mpg")
even though
"mpg" == new String("mpg")
Oddly, I can't replicate the behavior you're seeing on IE8 if I have
Prototype loaded, but I can easily do so without it by calling
isVideoFile(new String("mpg")).
HTH,
--
T.J. Crowder
tj / crowder software / com
www.crowdersoftware.com
On Sep 1, 11:14 pm, Mojito <[email protected]> wrote:
> My function works as expected in all non-IE browsers. But when I try
> it in IE8, it doesn't scan the array correctly. Any easy workaround
> rather than implementing my own indexOf()?
>
> +++++++++++++++++++++++++++++++++++++
>
> function isVideoFile(extension)
> {
> extension = extension.strip();
> alert(typeof extension);
> alert(extension);
> alert(['3g2', '3gp', 'asf', 'asx', 'avi', 'flv', 'mkv', 'mov',
> 'mp4', 'mpg', 'mpeg', 'qt', 'rm', 'vob', 'wmv'].indexOf
> (extension));
>
> }
>
> +++++++++++++++++++++++++++++++++++++
>
> The output when I pass in 'mpg':
>
> 1) string
> 2) mpg
> 3) -1
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