1360388 - "selectionchange" only fires once when entering text at end of textarea

Status: RESOLVED DUPLICATE of bug 1713334

(Core :: DOM: Selection, defect)

Description

[(inactive) Jim Chen [:jchen] [:darchons]]

Attachment: Testcase

Using the testcase in Nightly, the "selectionchange" count only increases _once_ when inputting text at the end (and only at the end) of the <textarea> field.

Comment 1

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Perhaps, this occurs when selection is collapsed at start of the trailing <br> element. I think that editor should collapse Selection at end of the end of the text node. (So, this might be an editor's bug.)

Comment 3

[alexander]

So 3 years have passed and selectionchange stopped working for Textarea/Input tags in Firefox completely? How are we suppose to track caret position without crazy hacks?

Comment 4

[alexander]

It works in Chrome, except it doesn't fire when you delete chars, only move caret around or enter.

Comment 5

[Makoto Kato [:m_kato]]

(In reply to alexander from comment #3)

So 3 years have passed and selectionchange stopped working for Textarea/Input tags in Firefox completely? How are we suppose to track caret position without crazy hacks?

Although Masayuki comments this root cause by comment #1, Gecko sets selection position to last <br> element by TextEditor::EnsureCaretNotAtEndOfTextNode at force if inserted text is last. selectionchange is dispatched when selection position (node and offset) is changed. Unfortunately, even if text node before <br> element is changed, selected node and offset value is still same value. So selectionchange won't be dispatched.

So to fix this, we need another hack for <textarea> or change this design that we don't set selection to <br> element.

Comment 6

[Kagami Rosylight [:saschanaz] (they/them)]

The repro stopped working on Chrome. Modifying line 11 to document.addEventListener("selectionchange") makes it work but then it stops working on Firefox. I guess there was a behavior change in selectionchange.

Filed Bug 1648944.

Comment 7

[Kagami Rosylight [:saschanaz] (they/them)]

Fixed in: