Primefaces Ajax Listener

by Online Tutorials Library July 14, 2022

PrimeFaces Ajax Listener

This attribute is used to call Java method by using an Ajax request. It is an attribute of <a:ajax> component.

Here, we are creating an example that calls a method from ManagedBean. It includes the following files and code.

JSF File

// ajax-listener.xhtml

  <?xml version=’1.0′ encoding=’UTF-8′ ?>  <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN””http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>  <html xmlns=”http://www.w3.org/1999/xhtml”  xmlns:h=”http://xmlns.jcp.org/jsf/html”  xmlns:p=”http://primefaces.org/ui”>  <h:head>  <title>Ajax Listener</title>  </h:head>  <h:body>  <h2>Ajax Listener Example</h2>  <h:form>  <h:panelGrid columns=”3″>  <h:outputText value=”Enter: ” />  <p:inputText id=”counter” value=”#{listenerBean.text}” placeholder=”Enter Text”>  <p:ajax event=”keyup” update=”out” listener=”#{listenerBean.ajaxEvent()}” />  </p:inputText>  </h:panelGrid>  <h:panelGrid id=”out”>  <h2>Output</h2>  <h:outputText value=”#{listenerBean.text}” />  </h:panelGrid>  </h:form>  </h:body>  </html>  

Managed Bean

// ListenerBean.java

  package com.tutoraspire;  import javax.faces.bean.ManagedBean;  @ManagedBean  public class ListenerBean {  String text;  public String getText() {  return text;  }  public void setText(String text) {  this.text = text;  }  public void ajaxEvent() {  text = text.toUpperCase();  }  }  

Output:

It will call Java method that converts input value into uppercase.

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