Bug 180465 – change event is dispatched when .files property is set at <input type="file"> element

• Status: RESOLVED
• Resolution: FIXED
• Component: Forms

Created attachment 328552 [details]
change event dispatched when .files set at <input type="file">

Programmatically set .files property of <input type="file"> element to a FileList object

Expected behaviour: change event should not be dispatched to the element
Actual result: change event is dispatched to the element

Browser: Chromium 62

See https://bugs.chromium.org/p/chromium/issues/detail?id=792336, https://github.com/whatwg/html/issues/3269

[Simon Fraser (smfr)]

Does this reproduce in Safari? Chrome bugs should be filed in the Chromium bug tracker.

[Kaiido]

This is a Safari only bug, still reproducible in current TP Release 128 (Safari 15.0, WebKit 16612.1.22.11.3)

Here is a fiddle reproducing the issue: https://jsfiddle.net/34sxmbqc/

Specs (https://html.spec.whatwg.org/multipage/input.html#dom-input-files) do not ask to fire an event here, since the change has been caused by script manipulation.

The particularly alarming point is that this event even has the `isTrusted` property set to `true`.

[Chris Dumez]

Created attachment 436325 [details]
Patch

[EWS]

Committed r281527 (240899@main): <https://commits.webkit.org/240899@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 436325 [details].

[Radar WebKit Bug Importer]

<rdar://problem/82315840>