Bug 15903 – When empty <input> is focused, getSelection() exposes shadow tree nodes

• Component: Forms
• Status: RESOLVED FIXED

[Adam Roben (:aroben)]

When an empty <input> element is focused, window.getSelection().getRangeAt(0).startContainer returns an HTMLDivElement. I believe this is the HTMLInnerTextField element we put in the shadow tree. We should be returning the HTMLInputElement itself, not this shadow child.

[Adam Roben (:aroben)]

Created attachment 17125 [details]
testcase

[Alexey Proskuryakov]

What should we return if the INPUT is not empty?

Firefox seems to behave differently - it returns last selection outside INPUT (such as (BODY, 0) - (BODY, 0)) or raises an exception because of not being able to execute getRange(), depending on some conditions that aren't clear to me.

[Adam Roben (:aroben)]

(In reply to comment #2)
> What should we return if the INPUT is not empty?
> 
> Firefox seems to behave differently - it returns last selection outside INPUT
> (such as (BODY, 0) - (BODY, 0)) or raises an exception because of not being
> able to execute getRange(), depending on some conditions that aren't clear to
> me.

I guess we'll have to test other browsers as well. I only mentioned the empty case here because it was clearly wrong.

[Alex Steitz]

I found out that this problem affects any input/textarea element whether empty or not.

I also encountered problems with the "anchorNode" and "focusNode" properties of the selection object. These properties as well as the "startContainer" and the "endContainer" are returning a DIV element as parentNode of the selected text node.

I've attached a simple testcase to demonstrate this behaviour.

[Alex Steitz]

Created attachment 22445 [details]
testcase for input/textarea elements with selection/range objects

[Eric Seidel (no email)]

Does it return the parent div, or the shadow node?  If it's the shadow node, this will go away when Ojan's patch to remove shadow nodes on <input> elements is finished.

[Alex Steitz]

> Does it return the parent div, or the shadow node?  If it's the shadow node,
> this will go away when Ojan's patch to remove shadow nodes on <input> elements
> is finished.
No, the problem is (as you can see at attached test) that the result is a DIV element with the text node inside, but the INPUT/TEXTAREA element is gone.

The result should be 

--snip--
<div>
  <input id="a" value="test input"/>
</div>
--snip--

but it returns

--snip--
<div>
    test input
</div>
--snip--

Same issue is also true for the TEXTAREA element.

[Alexey Proskuryakov]

<rdar://problem/7103776>

[Darin Adler]

*** Bug 28086 has been marked as a duplicate of this bug. ***

[Darin Adler]

Created attachment 34353 [details]
patch

[Darin Adler]

http://trac.webkit.org/changeset/46982