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Ajax Framework Callback

Callback executes JavaScript on an event of a component instead of an AJAX request. Like p:ajax it is attached to an event of the component, the JavaScript gets source, event, params and ext. Returning false stops the following behaviors of the event, e.g. a p:ajax.

Callback Tag Documentation

Callback executes JavaScript on an event of the component instead of an AJAX request like p:ajax.

Name	Type	Required	Default	Description
disabled	boolean	false	false	Disables the callback.
event	String	false		Event of the component that executes the JavaScript, the default event of the component if not set.
execute	String	false		JavaScript to execute, the body of a function with the arguments source (client id of the component), event (name of the event), params (parameters of the event) and ext. Returning false stops the following behaviors of the event.

Name	Library	Target
No records found.

RESOURCES

Tag Documentation Documentation Documentation

ON THIS PAGE

Introduction Process PartialSubmit Selector Search Validation RemoteCommand Observer Callback Poll Fragment Status Lifecycle Dropdown

Usage


<p:growl id="growl" showDetail="true"/>

<h:form>
    <div class="card">
        <h5 class="mt-0">Basic</h5>
        <p:selectOneMenu id="city" widgetVar="cityMenu" styleClass="mr-3">
            <f:selectItem itemLabel="Berlin" itemValue="Berlin"/>
            <f:selectItem itemLabel="Paris" itemValue="Paris"/>
            <f:selectItem itemLabel="Rome" itemValue="Rome"/>
            <p:callback event="change"
                        execute="document.getElementById('basicOutput').textContent = event + ' of ' + source + ': ' + PF('cityMenu').getSelectedValue();"/>
        </p:selectOneMenu>
        <span id="basicOutput"></span>
    </div>

    <div class="card">
        <h5 class="mt-0">Event Parameters</h5>
        <p class="mt-0">The <i>slideEnd</i> event passes the value of the slider in <i>params</i>.</p>
        <p:inputText id="sliderInput" styleClass="mb-3"/>
        <p:slider for="sliderInput" styleClass="w-20rem">
            <p:callback event="slideEnd"
                        execute="document.getElementById('sliderOutput').textContent = 'Slide ended at ' + params[0].value;"/>
        </p:slider>
        <p id="sliderOutput" class="mb-0"></p>
    </div>

    <div class="card">
        <h5 class="mt-0">Before p:ajax</h5>
        <p class="mt-0">The AJAX request is only sent if the callback does not return <i>false</i>.</p>
        <p:toggleSwitch value="#{callbackView.active}">
            <p:callback event="change" execute="return confirm('Send the AJAX request?');"/>
            <p:ajax listener="#{callbackView.onChange}" update="growl"/>
        </p:toggleSwitch>
    </div>
</h:form>


package org.primefaces.showcase.view.ajax;

import java.io.Serializable;

import jakarta.faces.application.FacesMessage;
import jakarta.faces.context.FacesContext;
import jakarta.faces.view.ViewScoped;
import jakarta.inject.Named;

@Named
@ViewScoped
public class CallbackView implements Serializable {

    private boolean active;

    public void onChange() {
        FacesContext.getCurrentInstance().addMessage(null,
                new FacesMessage(FacesMessage.SEVERITY_INFO, "AJAX request", "Active: " + active));
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }
}

Ajax Framework Callback

Callback Tag Documentation

Basic

Event Parameters

Before p:ajax

Usage

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