[Form] Feature request: attribute "multiple" support for FileType

[helmer]

Currently FileType lacks support for HTML5 attribute multiple for type="file" inputs. It's is really convenient and it'd be a nice to have feature.

http://dev.w3.org/html5/spec/Overview.html#file-upload-state

[stloyd]

I don't know how many browsers support it already, so i'm not sure about putting it to core. But now you can add this thought view:

{{ form_widget(form.file, { 'attr': { 'multiple': 'multiple' } }) }}

[helmer]

+1 for matching the spec (if you are smart enough to use multiple attribute for file uploads, you should be aware of limitations). Then again I'm unfamiliar of the general opinion regarding such half-supported features.

PS: Thanks for the snippet, you should also append [], sth like:
{{ form_widget(form.files, { 'attr': { 'multiple': 'multiple' }, 'full_name': form.files.get('full_name') ~ '[]' }) }}

[stof]

@bschussek ping

[gergelypolonkai]

As far as I know, all major browsers support this now. Is there a known workaround for this already?

[gergelypolonkai]

Okay, I revoke my last sentence, as IE9 still seems not to support it.

[vdroznik]

meanwhile IE10 came to the scene...

[bamarni]

Also, for validation part, currently the File constraint would fail for an array of files, what about a new Files constraint extending it?

Edit : nevermind, there is already an All constraint for this kind of use case.