com.vaadin.flow.dom

Class DomEvent

java.lang.Object

java.util.EventObject

com.vaadin.flow.dom.DomEvent

All Implemented Interfaces:

Serializable

public class DomEvent
extends EventObject

Server-side representation of a DOM event fired in the browser.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
DomEvent(Element source, String eventType, elemental.json.JsonObject eventData) Creates a new DOM event.

Method Summary

Modifier and Type	Method and Description
elemental.json.JsonObject	getEventData() Gets additional data related to the event.
Optional<Element>	getEventDataElement(String eventDataExpression) Gets the closest Element corresponding to the given event data expression.
Optional<Element>	getEventTarget() Gets the closest Element that corresponds to the event.target for the DOM event.
DebouncePhase	getPhase() Gets the debounce phase for which this event is fired.
Element	getSource() Returns the element on which the listener has been attached.
String	getType() Gets the type of the event.

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

DomEvent

public DomEvent(Element source,
                String eventType,
                elemental.json.JsonObject eventData)

Creates a new DOM event.

Parameters:

source - the element on which the listener has been attached, not null

eventType - the type of the event, not null

eventData - additional data related to the event, not null

See Also:

Element.addEventListener(String, DomEventListener), DomEventListener

Method Detail

getSource

public Element getSource()

Returns the element on which the listener has been attached.

Overrides:

getSource in class EventObject

Returns:

The element on which the listener has been attached.

See Also:

Element.addEventListener(String, DomEventListener), Element.addEventListener(String, DomEventListener, String...), for event target element

getType

public String getType()

Gets the type of the event.

Returns:

the type of the event

getEventData

public elemental.json.JsonObject getEventData()

Gets additional data related to the event. An empty JSON object is returned if no event data is available.

Returns:

a JSON object containing event data, never null

See Also:

DomListenerRegistration.addEventData(String)

getPhase

public DebouncePhase getPhase()

Gets the debounce phase for which this event is fired. This is used internally to only deliver the event to the appropriate listener in cases where there are multiple listeners for the same event with different debounce settings.

Returns:

the debounce phase

getEventTarget

public Optional<Element> getEventTarget()

Gets the closest Element that corresponds to the event.target for the DOM event. This is always inside the child hierarchy of the element returned by getSource().

To get this reported, you need to call DomListenerRegistration.mapEventTargetElement() or an empty optional is always returned.

The returned element is the same as getSource() only if the event originated from that element on the browser (and not from its child).

Returns:

the element that corresponds to event.target or an empty optional

Since:

9.0

getEventDataElement

public Optional<Element> getEventDataElement(String eventDataExpression)

Gets the closest Element corresponding to the given event data expression. NOTE: this only works if you have added the expression using DomListenerRegistration.addEventDataElement(String).

If the evaluated JS expression returned an element that is not created or controlled by the server side, the closest parent element that is controlled is returned instead. Invisible elements are not reported.

In case you want the event.target element, use getEventTarget() instead.

Parameters:

eventDataExpression - the expression that was executed on the client to retrieve the element, not null

Returns:

the element that corresponds to the given expression or an empty optional

Since:

9.0