[whatwg] Removing multiple attribute from <input type=file multiple> with selected files

Jonas Sicking jonas at sicking.cc
Mon Dec 14 11:39:48 PST 2009

On Mon, Dec 14, 2009 at 10:33 AM, Ojan Vafai <ojan at chromium.org> wrote:
> On Sun, Dec 13, 2009 at 7:47 AM, Jonas Sicking <jonas at sicking.cc> wrote:
>> On Sun, Dec 13, 2009 at 5:36 AM, TAMURA, Kent <tkent at chromium.org> wrote:
>> > What should happen to selected files in a case that a user selects
>> > multiple
>> > files for <input type=file multiple> and then a script code removes the
>> > multiple attribute from the input element?
>> >  - nothing, no change to the selected files and they will be submitted,
>> >  - cleared, or
>> >  - a single file remains
>> I ran into the same question when developing this for firefox. I don't
>> really care what happens either way since I don't see a use case for
>> removing the multiple attribute.
>> What I ended up doing was to do your first option above.
> This should be an invalid thing to do. Can we throw an exception in addition
> to leaving the list of files untouched?

I would prefer not to throw an exception. Making removeAttribute throw
an exception seems wrong since the attribute *is* in fact removed, and
making foo.multiple=false throw would mean that it would behave
differently from all other "mapped" IDL attributes.

I'd really prefer to keep things simple here as I doubt that this is
something that anyone will ever do. Much less depend on a particular

You're off course free to put a warning in a developer console or
something like that though.

/ Jonas

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