Bug 108021 – WebKit provides wrong dropEffect on dragend/drop events

• Status: UNCONFIRMED
• Component: DOM

At least while dragging from external application.
So, I need to remember the drag operation on last dragover event. But external app get wrong dropEffect also, so it cannot properly handle dragging with 'move' operation, for example.

Can it be fixed? I'm just web-developer, I don't know C++ ((

Se also https://bugs.webkit.org/show_bug.cgi?id=101853

[Alexey Proskuryakov]

Please post detailed steps to reproduce this issue. This bug is not actionable in its current state.

Created attachment 184905 [details]
Testcase for wrong dropEffect on drop event

Open attachment, select the text you see in the document, drag and drop it in any place on document.
Browser should output dropEffect: copy. Instead webkit-based browsers output dropEffect: none

dragstart handler sets dataTransfer.effectAllowed to 'copyMove'. dragover handler sets dropEffect to 'copy'.
According to http://dev.w3.org/html5/spec-preview/dnd.html#dom-dragevent-datatransfer , browser should set dropEffect attribute "to the value corresponding to the current drag operation if e is drop or dragend;"
Since current drag operation is 'copy' (defined according to dropEffect), webkit provides 'none', what is the current issue.

Firefox, Opera work as expected. IE also has this bug.

Thanks for attention.

[Tony R.]

Almost 2 years later?  Wow…

I just discovered this bug.  At first I set `event.dataTransfer.dropEffect` to `'move'` according to prescribed writings on the web.  But when I checked the value in `drop` handler, the value was `'none'`.

Out of frustration, I eventually started setting it in EVERY handler.  But in `drop` handler, it is always `'none'`.

Please consider this an enthusiastic +1 for this bug!

[Lucas Forschler]

Mass move bugs into the DOM component.

[Ahmad Saleem]

*** Safari Technology Preview 188 / WebKit ToT ***

dropEffect: none

*** Chrome Canary 123 ***

dropEffect: none

*** Firefox Nightly 124 ***

dropEffect: copy

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Just posting latest results. Thanks!