[webkit-dev] propose an API to return Range in <textarea> etc. form control nodes (similar functionality as document.caretRangeFromPoint)

Xiaomei Ji xji at chromium.org
Fri Oct 16 10:27:03 PDT 2009

(sorry for the spam, send last time using the wrong 'from' email address to
the public mailing lists)

Hi Maciej:
Thanks for your comments.

I have a question about "interface CaretPosition":
In case of form control node, such as <textarea>,  the 'offset' is the
character offset within the <textarea> under mouse, 'offsetKind' is
"control", what is the value of 'containingNode"? Is it itself or its


On Mon, Oct 12, 2009 at 1:50 PM, Maciej Stachowiak <mjs at apple.com> wrote:

> On Oct 12, 2009, at 1:08 AM, Anne van Kesteren wrote:
>  On Fri, 09 Oct 2009 19:04:52 +0200, Xiaomei Ji <xji at chromium.org> wrote:
>>> Maybe I should propose Document.wordFromPoint() which  directly returns
>>> the word under the mouse (and handles both the DOM node and non-DOM form
>>> control nodes).
>>> It hides the information about the node and should be a useful API.
>> Don't you need at least some context information as well besides just the
>> word? Although I suppose you can get that using a combination of
>> elementFromPoint and wordFromPoint...
> I think we should consider changing caretRangeFromPoint's return type, if
> it's not too late. It's useful to get the caret position inside a text form
> control, beyond the immediate use case.
> Instead of returning a Range, caretRangeFromPoint could return an object
> like this:
> interface CaretPosition {
>    readonly attribute Node containingNode;
>    readonly attribute int offset;
>    readonly attribute DOMString offsetKind; // "document" or "control"
> }
> It could have a convenience method for converting a Range too, if that's
> really needed (which would give null or something for a control position).
> Regards,
> Maciej
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