Package com.vaadin.flow.router

Interface BeforeLeaveObserver

All Superinterfaces:
BeforeLeaveHandler, Serializable
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface BeforeLeaveObserver extends BeforeLeaveHandler
Any attached component implementing this interface will receive an event before leaving the current navigation state.

During this event phase there is the possibility to reroute to another navigation target or to postpone the navigation (to for instance get user input).

If a route target is left for reasons not under the control of the navigator (for instance using Page.setLocation(URI), typing a URL into the address bar, or closing the browser), listeners are not called.

Since:
1.0
Author:
Vaadin Ltd