RichFaces a4j:Param

by Online Tutorials Library July 14, 2022

RichFaces <a4j:param>

It combines the functionalities of the JavaServer Faces ( JSF) components <f:param> and <f:actionListener>. It can be used with non-Ajax components in addition to Ajax components. It includes components such as the <h:link> and <h:button> components.

The <a4j:param> requires the following attributes.

The value attribute is the initial value of the parameter.
The assignTo attribute defines the bean property. The property is updated if the parent command component performs an action event during the Process Request phase.

Example

Here, in the following example, we are implementing <a4j:param> component. This example contains the following files.

JSF File

// ajax-param.xhtml

  <html xmlns=”http://www.w3.org/1999/xhtml”  xmlns:h=”http://xmlns.jcp.org/jsf/html”  xmlns:a4j=”http://richfaces.org/a4j”>  <h:head>  <title>Ajax Log</title>  </h:head>  <h:body>  <h:form id=”form”>  <a4j:commandButton value=”Set param” render=”rep”>  <a4j:param name=”username” value=”tutoraspire” assignTo=”#{ajaxParam.name}”/>  </a4j:commandButton><br/><br/>  <h:outputText  id=”rep” value=”Hello #{ajaxParam.name}”/>  </h:form>  </h:body>  </html>  

Managed Bean

// User.java

  import javax.faces.bean.ManagedBean;  import javax.faces.bean.RequestScoped;  @ManagedBean  @RequestScoped  public class User {  String name;  public String getName() {  return name;  }  public void setName(String name) {  this.name = name;  }  }  

Output:

A new parameter is set after clicking the button.

Next TopicRichfaces <a4j:commandbutton>

RichFaces a4j:Param

RichFaces <a4j:param>

Example

JSF File

Managed Bean

Verbal Reasoning | Assertion and Reason 1

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