Package com.vaadin.flow.component.trigger.internal

Class SetSignalAction<T>

java.lang.Object

com.vaadin.flow.component.trigger.internal.Action

com.vaadin.flow.component.trigger.internal.CallbackAction<T>

com.vaadin.flow.component.trigger.internal.SetSignalAction<T>

Type Parameters:

T - the type the signal holds and the JSON value is decoded to

All Implemented Interfaces:

Serializable

public class SetSignalAction<T>
extends CallbackAction<T>

Named CallbackAction that calls set on a ValueSignal — the common case of bridging a client-side trigger into server-side signal state. For other server-side destinations (logging, custom events, queues, …) use CallbackAction directly with a method reference.

 ValueSignal<String> valueSignal = new ValueSignal<>("");
 DomEventTrigger input = new DomEventTrigger(textField, "input");
 input.triggers(new SetSignalAction<>(valueSignal, String.class,
         new PropertyInput<>(textField, "value", String.class)));
 

The signal's own equality checker debounces redundant updates, so emitting identical values back-to-back does not retrigger downstream effects.

For internal use only. May be renamed or removed in a future release.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.vaadin.flow.component.trigger.internal.Action

Action.Input<T>

Constructor Summary

Constructors

Constructor	Description
SetSignalAction(ValueSignal<? super T> signal, Class<T> valueType, Action.Input<? extends T> source)	Creates an action that, when the trigger fires, evaluates source on the client, sends the value to the server, decodes it as valueType, and assigns it to signal via ValueSignal.set(Object).

Method Summary

Methods inherited from class com.vaadin.flow.component.trigger.internal.CallbackAction

toJs

Methods inherited from class java.lang.Object

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

Constructor Details

SetSignalAction

public SetSignalAction(ValueSignal<? super T> signal,
 Class<T> valueType,
 Action.Input<? extends T> source)

Creates an action that, when the trigger fires, evaluates source on the client, sends the value to the server, decodes it as valueType, and assigns it to signal via ValueSignal.set(Object).

Parameters:

signal - the local value signal to update on the server, not null

valueType - runtime type the JSON value is decoded to before being passed to ValueSignal.set(Object), not null

source - input that produces the value on the client when the trigger fires, not null