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Ajax Framework Listener

A java method can be invoked in an ajax request using listener option of p:ajax.

SERVER API

listener.xhtml
ListenerView.java


<div class="card">
    <h:form>
        <h:panelGrid columns="3">
            <h:outputText value="Keyup: "/>
            <p:inputText id="counter" value="#{listenerView.text}">
                <p:ajax event="keyup" update="out" listener="#{listenerView.handleKeyEvent}"/>
            </p:inputText>
            <h:outputText id="out" value="#{listenerView.text}"/>
        </h:panelGrid>
    </h:form>
</div>


@Named
@RequestScoped
public class ListenerView {
    
    private String text;

    public String getText() {
        return text;
    }
    public void setText(String text) {
        this.text = text;
    }
    
    public void handleKeyEvent() {
        text = text.toUpperCase();
    }
}