com.vaadin.flow.router

Class BeforeLeaveEvent

java.lang.Object

java.util.EventObject

com.vaadin.flow.router.BeforeEvent

com.vaadin.flow.router.BeforeLeaveEvent

All Implemented Interfaces:

Serializable

public class BeforeLeaveEvent
extends BeforeEvent

Event created before navigation happens.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	BeforeLeaveEvent.ContinueNavigationAction The action to resume a postponed BeforeEnterEvent.

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
BeforeLeaveEvent(NavigationEvent event, Class<?> navigationTarget) Construct event from a NavigationEvent.
BeforeLeaveEvent(Router router, NavigationTrigger trigger, Location location, Class<?> navigationTarget, UI ui) Constructs a new BeforeNavigation Event.

Method Summary

Modifier and Type	Method and Description
BeforeLeaveEvent.ContinueNavigationAction	getContinueNavigationAction() Gets the action used to resume this event, if it was postponed.
boolean	isPostponed() Checks whether this event was postponed.
BeforeLeaveEvent.ContinueNavigationAction	postpone() Initiates the postponement of the current navigation transition, allowing a listener to e.g.

Methods inherited from class com.vaadin.flow.router.BeforeEvent

getErrorParameter, getLocation, getNavigationTarget, getRerouteTarget, getRouteTargetType, getSource, getTrigger, getUI, hasErrorParameter, hasRerouteTarget, rerouteTo, rerouteTo, rerouteTo, rerouteTo, rerouteTo, rerouteTo, rerouteToError, rerouteToError, rerouteToError

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BeforeLeaveEvent

public BeforeLeaveEvent(NavigationEvent event,
                        Class<?> navigationTarget)

Construct event from a NavigationEvent.

Parameters:

event - NavigationEvent that is on going

navigationTarget - Navigation target

BeforeLeaveEvent

public BeforeLeaveEvent(Router router,
                        NavigationTrigger trigger,
                        Location location,
                        Class<?> navigationTarget,
                        UI ui)

Constructs a new BeforeNavigation Event.

Parameters:

router - the router that triggered the change, not null

trigger - the type of user action that triggered this location change, not null

location - the new location, not null

navigationTarget - navigation target class

ui - the UI related to the navigation

Method Detail

postpone

public BeforeLeaveEvent.ContinueNavigationAction postpone()

Initiates the postponement of the current navigation transition, allowing a listener to e.g. display a confirmation dialog before finishing the transition.

This is only valid while leaving (deactivating) a page; if the method is called while entering / activating the new page, it will throw an IllegalStateException.

Returns:

the action to run when the transition is to be resumed, or null

isPostponed

public boolean isPostponed()

Checks whether this event was postponed.

Returns:

true if the event was postponed, false otherwise

getContinueNavigationAction

public BeforeLeaveEvent.ContinueNavigationAction getContinueNavigationAction()

Gets the action used to resume this event, if it was postponed.

Returns:

the action used to resume this event if it was postponed, or null if it is not being postponed