The AJAX mechanism used by JSF is encapsulated in a JavaScript file, named jsf.js. This file is available in the javax.faces library. When we are using <f:ajax>, this file is loaded behind the scene without any explicit requirements.

However, jsf.js can be loaded explicitly with any of the following methods:

Focusing on <h:outputScript>, you can attach AJAX to a component as shown in the following example code:

<h:form prependId="false">             
  <h:outputScript name="jsf.js" library
="javax.faces" target="head"/>
  <h:inputText id="nameInId" value="#{ajaxBean.name}"/>
  <h:outputText id="nameOutId" value="#{ajaxBean.name}"/>
  <h:commandButton id="submit" value="Send" 
       ...