This event is emitted after a layer was dismissed.
The event is emitted on the layer's when the close animation
is starting. If the layer has no close animaton and was already removed from the DOM,
the event is emitted a second time on the document
.
Tip
To prevent a layer from being closed, listen to
up:layer:dismiss
instead.
The server response that caused this overlay to close.
Will be undefined
if the overlay was not closed in reaction to a server response.