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/Dart 2

onBeforeUnload property

Stream<Event> onBeforeUnload

Stream of beforeunload events handled by this Window.

Implementation

Stream<Event> get onBeforeUnload => beforeUnloadEvent.forTarget(this);

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/Window/onBeforeUnload.html