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Re: [CSSOM View] Extensions to Element.scrollLeft and Element.scrollTop are not valid WebIDL

From: Jet Villegas W3C <w3c@junglecode.net>
Date: Tue, 29 Jul 2014 15:45:51 -0700
Message-ID: <CAP82YM5fiGppPJJTE+eJOmuv+kOfz+OyK=qDy4wH62ycxYQ8iA@mail.gmail.com>
To: Kip Gilbert <kgilbert@mozilla.com>
Cc: www-style@w3c.org
It doesn't look like there are any objections to this proposal from last
week. We're going to implement the solution described in bug 26294
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=26294> unless we've got
other comments with a better idea.

Thanks,

--Jet


On Tue, Jul 22, 2014 at 5:39 PM, Kip Gilbert <kgilbert@mozilla.com> wrote:

> In the "Extensions to the Element Interface" section
> (http://www.w3.org/TR/cssom-view/#extensions-to-the-element-interface),
> the scrollTop and
> scrollLeft attributes have been extended:
>
>   attribute (double or ScrollOptionsVertical) scrollTop;
>   attribute (double or ScrollOptionsHorizontal) scrollLeft;
>
> The ScrollOptionsVertical and ScrollOptionsHorizontal dictionaries
> include the x and y position with the intent of setting the position
> and ScrollOptions simultaneously:
>
>   dictionary ScrollOptionsHorizontal : ScrollOptions {
>     double x;
>   };
>   dictionary ScrollOptionsVertical : ScrollOptions  {
>     double y;
>   };
>
> As the scrollLeft and scrollTop attributes are described in the CSSOM
> View specification as always returning double values while the setter
> functions receive either a double or dictionary value.  Setting an
> attribute with one datatype and returning a value with another data
> type is not allowed by the WebIDL specification.
>
> I have created a bug for this issue:
>
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=26294
>
> I would like to suggest that the scrollTop and scrollLeft attributes
> remain as double data type only, and that a separate method be added
> to the Element interface for scrolling with ScrollOptions:
>
>   void scrollTo(double x, double y, optional ScrollOptions options);
>
> Calling this method would be equivalent to setting both the scrollTop
> and scrollLeft attributes while simultanously specifying the
> ScrollOptions.
>
> - Kearwood "Kip" Gilbert
>
>
>
Received on Tuesday, 29 July 2014 22:46:19 UTC

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