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Re: [gamepad] Only 4 Controllers?

From: Lars Knudsen <larsgk@gmail.com>
Date: Wed, 25 Jan 2017 14:40:43 +0100
Message-ID: <CA+jkkcjUXe=Ovqi3GCsNjTkC2UQ-qNuWSoOLA-1qFtGmLhfk9g@mail.gmail.com>
To: Boris Zbarsky <bzbarsky@mit.edu>
Cc: public-webapps <public-webapps@w3.org>
On Thu, Dec 22, 2016 at 6:43 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> On 12/22/16 6:17 AM, Florian Bösch wrote:
>> Afaik this stems from a limitation of Windows not shared by other OS'es.
>> Does Firefox behave similarly?
> The Firefox behavior is as follows:
> 1)  There is no limit.
> 2)  Only entries for gamepads that are or were present are returned.
> 3)  If a gamepad is removed, its spot in the array becomes null.
> So calling getGamepad() if there are no gamepads will return an empty
> array.  At least on Mac; I haven't tested on Windows.
> Note that the length of the array _has_ to be able to be more than 4,
> because of the connection/disconnection behavior.  If I connect and then
> disconnect 5 gamepads and then connect a 6th one, the spec requires that an
> array of length 6 be returned.
> That said, the spec allows the array to be arbitrarily longer than the
> actual set of gamepads, padded with null; this is indistinguishable from
> the state where gamepads used to exist at those indices and then were
> disconnected.  So the Chrome/IE behavior described of returning a length-4
> array filled with null (not undefined) is spec-compliant.

It's kinda interesting though - and a very good example of what can be
misinterpreted/misused if specs are not precise ;)

> -Boris
Received on Wednesday, 25 January 2017 13:41:16 UTC

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