Ajax-enabled Faces applications
Jakarta Faces allows us to easily implement Asynchronous JavaScript and XML (Ajax) functionality into our web applications by simply employing the <f:ajax> tag and CDI named beans, without needing to implement any JavaScript code or having to parse JSON strings.
The following markup illustrates the typical usage of the <f:ajax> tag.
<h:form>
<h:messages/>
<h:panelGrid columns="2">
<h:outputText value="Echo input:"/>
<h:inputText id="textInput"
value="#{controller.text}">
<f:ajax render="textVal" event="keyup"/>
...
