Locale

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Input Style

Outlined

Filled

Free Themes

Built-in component themes created by the PrimeFaces Theme Designer.

Saga

Vela

Arya

Legacy Free Themes

Luna Amber

Luna Blue

Luna Green

Luna Pink

Nova

Nova Alt

Nova Accent

Ajax Framework Observer / Event

AutoUpdate allows you to use the observer pattern in which a component maintains a list of its dependents, called observers, and notifies them automatically of any state changes. Instead of having to list every component you want to update on a CommandButton you can subscribe components to listen to that button's event using @obs(event).

SERVER API

observer.xhtml
ObserverView.java


<div class="card">
    <h:form>
        <h:outputLabel for="name" value="Name" styleClass="mr-2" />
        <p:inputText id="name" value="#{observerView.text}">
            <p:ajax process="@this" update="@none" ignoreAutoUpdate="true"/>
        </p:inputText>

        <div class="my-3">
            <p:commandButton value="Update global" icon="pi pi-check" styleClass="mr-2" />
            <p:commandButton value="Update event1" update="@obs(event1)" icon="pi pi-check" styleClass="mr-2"/>
            <p:commandButton value="Update event2" update="@obs(event2)" icon="pi pi-check"/>
        </div>

        <h:outputText id="displayGlobal" value="Global: #{observerView.text}" styleClass="block mb-3">
            <p:autoUpdate/>
        </h:outputText>

        <h:outputText id="displayEvent1" value="Event1: #{observerView.text}" styleClass="block mb-3">
            <p:autoUpdate on="event1"/>
        </h:outputText>

        <h:outputText id="displayEvent2" value="Event2: #{observerView.text}" styleClass="block mb-3">
            <p:autoUpdate on="event2"/>
        </h:outputText>
    </h:form>
</div>


package org.primefaces.showcase.view.ajax;

import jakarta.faces.view.ViewScoped;
import jakarta.inject.Named;
import java.io.Serializable;

import io.quarkus.runtime.annotations.RegisterForReflection;

@Named
@ViewScoped
@RegisterForReflection(serialization = true)
public class ObserverView implements Serializable {

    private String text;

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }
}