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RE: Allowing IDL attributes to have different types for the getter and setter

From: Jonas Sicking <jonas@sicking.cc>
Date: Fri, 11 Oct 2013 10:34:01 -0700
Message-ID: <CA+c2ei8O_9X9R7HJQHxWr+VvoTkhDhRJfGTxgSC2Ft76or5L5Q@mail.gmail.com>
To: Domenic Denicola <domenic@domenicdenicola.com>
Cc: Boris Zbarsky <bzbarsky@mit.edu>, "public-script-coord@w3.org" <public-script-coord@w3.org>
Bringing back an old thread since we're in the process of implementing.

On Apr 18, 2013 4:21 AM, "Domenic Denicola" <domenic@domenicdenicola.com> wrote:
> From: Boris Zbarsky [mailto:bzbarsky@MIT.EDU]
> > On 4/17/13 9:58 PM, Domenic Denicola wrote:
> > > That sounds like a bizarre API to me. Access or properties should, as much as possible, behave just like normal data properties.
> >
> > OK.  What would you like to see for the specific API under discussion here?
> Assuming I'm understanding the background reading correctly,
>     myFileInput.files = new FileList([aFile]);
>     myFileInput.files = new FileList([bFile, cFile]);

Why is that better than

myFileInput.files = [aFile];
myFileInput.files = [bFile, cFile];

I'd really like to avoid introducing new XList type for every type X
that we add to the system. Taken to an extreme we'd get sillyness like

In this specific case, I stick to an earlier proposal that I made elsewhere:

myFileInput.files returns a simple raw JS Array
This array can be modified using normal JS Array functions, like any
other Array can.
myFileInput.files is settable to any other raw JS Array, i.e.
myFileInput.files = ["a", 2, myFile3] works.
x = [...]; myFileInput.files = x; myFileInput.files === x; always returns true
Submitting ignores any non-Files in the Array

When exactly the UI is updated is somewhat tricky. We can likely use
Object.observe which would lead to updating at end-of-task I think.

/ Jonas
Received on Friday, 11 October 2013 17:34:59 UTC

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