178058 2017-10-07 19:05:15 -0700 dataTransfer.effectAllowed returns "all" when it's set to "copy" or "move" during dragstart 2024-02-07 21:43:54 -0800 1 1 1 Unclassified WebKit UI Events WebKit Nightly Build Unspecified Unspecified NEW https://jsfiddle.net/4tfzmLwo/ InRadar P2 Normal --- 1 rniwa webkit-unassigned ahmad.saleem792 darin govett vissu_nbkr webkit-bug-importer wenson_hsieh oldest_to_newest 1358004 0 rniwa 2017-10-07 19:05:15 -0700 When dataTransfer.effectAllowed to set to "copy", "move", etc... during dragstart, a subsequent drag event's dataTransfer's effectAllowed always returns "all" 1358005 1 webkit-bug-importer 2017-10-07 19:05:42 -0700 <rdar://problem/34874174> 1358012 2 wenson_hsieh 2017-10-07 19:21:50 -0700 Small test case showing the problem: <div id="source" draggable="true">Drag me!</div> <script> function write(text) { let element = document.createElement("pre"); element.textContent = text; document.body.appendChild(element); } function writeEffectAllowed(event) { write(`(${event.type}): effectAllowed = ${event.dataTransfer.effectAllowed}`); event.preventDefault(); } source.addEventListener("dragstart", event => { event.dataTransfer.effectAllowed = "move"; write("Setting the effect allowed to move!"); }); document.body.addEventListener("dragover", writeEffectAllowed); document.body.addEventListener("drop", writeEffectAllowed); </script> 1580001 3 vissu_nbkr 2019-10-14 22:54:01 -0700 Setting effectAllowed to 'copy' or 'move' has no effect in safari. The effectAllowed is always copyMove 1895680 4 govett 2022-09-01 18:28:58 -0700 This is still a problem. The behavior is slightly different on macOS and iOS: * On macOS, effectAllowed is always "copyMove" in the dragover event regardless of what was set during dragstart, unless a modifier key is set, in which case it is filtered to either copy or move. This also means that dropEffect can never be set to "link", and holding the Control key results in effectAllowed being set to "none" rather than "link". For drags initiated outside the browser, e.g. in Finder, effectAllowed is always "all" rather than "copyMove", and "link" operations work as expected. * On iOS, effectAllowed is always "all". Modifier keys have no effect. 2011645 5 ahmad.saleem792 2024-02-07 21:43:54 -0800 *** Safari Technology Preview 188 *** Copymove *** Chrome Canary 123 *** Does not allow 'text' selection but show 'move' when selected *** Firefox Nightly 124 *** Does not show any text like `copy move` or `move` but just: >> Setting the effect allowed to move! ____ Just wanted to share up-to-date test results.