core/dev.fritz2.core/WithEvents/beforeprintsIf

beforeprintsIf

open fun beforeprintsIf(selector: Event.() -> Boolean): Listener<Event, T>

occurs when a page is about to be printed

Return

a Listener that emits Events on its Flow

Parameters

selector

expression to evaluate, which specific event should be emitted to the Flow. It is also possible and encouraged to manipulate the event dispatching by calling stopPropagation or similar DOM-API.