[jboss-user] [JBoss Seam] - Re: Seam + ScopeType.EVENT

Wed Nov 29 05:08:12 EST 2006

This is comparable with a request scope. For exampe a page with a backing bean that can submit data, the backing bean can give feedback, but the data is not saved after that.

Example:

  | <!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:s="http://jboss.com/products/seam/taglib"
  | 	xmlns:ui="http://java.sun.com/jsf/facelets"
  | 	xmlns:f="http://java.sun.com/jsf/core"
  | 	xmlns:h="http://java.sun.com/jsf/html"
  | 	xmlns:c="http://java.sun.com/jstl/core">
  | <body>
  | <ui:define name="body">
  | 	<h:form id="frm_Hello">
  | 	Please fill in your name: <h:inputText id="txt_Name"
  | 			value="#{hello.name}" />
  | 		<h:commandButton id="btn_sayHello" value="Say Hello!"
  | 			action="#{hello.sayHello}" />
  | 		<br/>
  | 		<h:outputText id="greeting" value="Hello #{hello.name}"
  | 			rendered="#{not empty hello.name}" />
  | 	</h:form>
  | </ui:define>
  | </body>
  | </html>
  | 

  | package seamdemo.hello.backingbeans;
  | 
  | import javax.ejb.Remove;
  | import javax.ejb.Stateful;
  | 
  | import org.jboss.seam.ScopeType;
  | import org.jboss.seam.annotations.Destroy;
  | import org.jboss.seam.annotations.Name;
  | import org.jboss.seam.annotations.Scope;
  | 
  | @Stateful
  | @Scope(ScopeType.EVENT)
  | @Name("hello")
  | public class HelloBean implements Hello {
  | 	private String name;
  | 	
  | 	public String getName() {
  | 		return name;
  | 	}
  | 
  | 	public String sayHello() {
  | 		return "";
  | 	}
  | 
  | 	public void setName(String name) {
  | 		this.name = name;
  | 	}
  | 
  | 	@Remove @Destroy
  | 	public void destory() {
  | 	}
  | }
  | 

After showing the entered name, the name is not saved. So if you reload the page, the textfield is empty again.

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