Passing bean properties and action methods via <ui:param>

In the previous example, you saw how to exploit <ui:param> for sending literal strings to a template or included page, but <ui:param> can be used for more than this. Let's suppose that we have the following code of the bean, TemplatesBean:

@Named
@ViewScoped
public class TemplatesBean implements Serializable {
    
  private String msgTopDefault="";
  private String msgBottomDefault="";
  private String msgCenterDefault="No center content ...press the below button!";

  //getters and setters
   
  public void topAction(String msg){
    this.msgTopDefault = msg;
  }
    
  public void bottomAction(String msg){
    this.msgBottomDefault = msg;
  }
    
  public void centerAction(){
    this.msgCenterDefault="This is default content";
  }    
}

Further, we want to display the value of the msgCenterDefault property in contentDefault.xhtml. Of course, this is very easy to accomplish...