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Re: [selection] Selection.setBaseAndExtent

From: Tim Down <tim@timdown.co.uk>
Date: Thu, 7 Aug 2014 09:13:16 +0100
Message-ID: <CAOYSAj1eBzrHAoKPjg-1O6ecOEX3-9VJEAPtqgTc7WC9q_Owng@mail.gmail.com>
To: Julie Parent <jparent@google.com>
Cc: Ben Peters <Ben.Peters@microsoft.com>, Ryosuke Niwa <rniwa@apple.com>, "James M. Greene" <james.m.greene@gmail.com>, public-webapps <public-webapps@w3.org>
One possible reason for that is that there is no documentation for it
anywhere. At least, none that I've ever been able to find, and I'm more
interested than the average developer. This goes too for other WebKit
extensions such as range.expand().

Tim


On 7 August 2014 00:43, Julie Parent <jparent@google.com> wrote:

> For what its worth, we plan to remove base and extent from Blink/Chromium (
> https://code.google.com/p/chromium/issues/detail?id=230267).  We've found
> that developers do not understand the difference between focus/anchor and
> base/extent, and since it is only supported by WebKit based browsers, it is
> not heavily used.
>
>
> On Wed, Aug 6, 2014 at 12:58 PM, Ben Peters <Ben.Peters@microsoft.com>
> wrote:
>
>>  I don’t understand the difference. setBaseAndExtent would then set all
>> 4 of these properties of selection? Do you have a definition to use for
>> this?
>>
>>
>>
>> *From:* Ryosuke Niwa [mailto:rniwa@apple.com]
>> *Sent:* Wednesday, August 6, 2014 12:43 PM
>> *To:* James M. Greene
>> *Cc:* Ben Peters; public-webapps
>> *Subject:* Re: [selection] Selection.setBaseAndExtent
>>
>>
>>
>> Focus and anchor are different concepts from base and extent. While the
>> former always coincide with start and end, base and extent may be different
>> from those two.
>>
>>
>>
>> In particular, when a user selects text by double clicking on a word,
>> base and extent stays at where the user had clicked while focus and anchor
>> will extend to the beginning and the end of the word like start and end.
>>
>> - R. Niwa
>>
>>
>> On Aug 5, 2014, at 4:58 PM, James M. Greene <james.m.greene@gmail.com>
>> wrote:
>>
>>  For consistent terminology with the rest of the API, shouldn't it be
>> `setAnchorAndFocus`?
>>
>> Sincerely,
>>     James Greene
>>     Sent from my [smart?]phone
>>
>> On Aug 5, 2014 5:54 PM, "Ben Peters" <Ben.Peters@microsoft.com> wrote:
>>
>>  I have added proposed text to this bug. Any objections to this?
>>
>>
>>
>> Proposed text, based on the text for collapse():
>>
>>
>>
>> void setBaseAndExtent (Node baseNode, unsigned long baseOffset, Node
>> extentNode, unsigned long extentOffset);
>>
>>
>>
>> The method must throw an IndexSizeError exception if offset is negative
>> or longer than node's length ([DOM4]). Otherwise, it must create a new
>> range, set ([DOM4]) its start to (baseNode, baseOffset) and its and end to
>> (extentNode, extentOffset), and set the context object's range to the
>> newly-created range.
>>
>>
>>
>> *From:* Ben Peters
>> *Sent:* Tuesday, May 20, 2014 11:37 AM
>> *To:* Ben Peters; Ryosuke Niwa; public-webapps@w3.org
>> *Subject:* RE: [selection] Selection.setBaseAndExtent
>>
>>
>>
>> I have filed a bug to track this issue [1].
>>
>>
>>
>> Ben
>>
>>
>>
>> [1] https://www.w3.org/Bugs/Public/show_bug.cgi?id=25831
>>
>>
>>
>>
>>
>> *From:* Ben Peters [mailto:Ben.Peters@microsoft.com
>> <Ben.Peters@microsoft.com>]
>> *Sent:* Monday, May 5, 2014 11:28 PM
>> *To:* Ryosuke Niwa; public-webapps@w3.org
>> *Subject:* [selection] Selection.setBaseAndExtent
>>
>>
>>
>> I noticed that some websites use selection.setBaseAndExtent [1].
>> According to what limited documentation I could find, it works similar to
>> selection.extend. Is there any intention to standardize this, or is it made
>> obsolete by selection.extend?
>>
>>
>>
>> Ben
>>
>>
>>
>> [1]
>> http://stackoverflow.com/questions/985272/jquery-selecting-text-in-an-element-akin-to-highlighting-with-your-mouse
>>
>>
>
Received on Thursday, 7 August 2014 08:13:46 UTC

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