1 2 Previous Next 17 Replies Latest reply on Jul 11, 2007 7:28 AM by Adrian Mitev

    Scopes problem

    Adrian Mitev Master

      Hi all i have the following scenario - page for creating a new project that has a few input fields for project info and data table with components related to that project. Here is the page code:

      <h:form>
       <table>
       <tr>
       <td colspan="3">
       <h:messages layout="table" globalOnly="true" styleClass="message" id="globalMessages" />
       </td>
       </tr>
      
       <tr>
       <td>
       #{projMsg.name}:
       </td>
       <td>
       <h:inputText id="prj_name" value="#{project.name}" required="true"> </h:inputText>
       </td>
       </tr>
      
       <tr>
       <td colspan="2" align="center">
       <h:message styleClass="errorMessage" for="prj_name" />
       </td>
       </tr>
      
       <tr>
       <td>
       #{projMsg.url}:
       </td>
       <td>
       <h:inputText id="prj_url" value="#{project.url}"> </h:inputText>
       </td>
       </tr>
      
       <tr>
       <td>
       #{projMsg.description}
       </td>
       <td>
       <h:inputTextarea rows="4" cols="20" id="prj_desc" value="#{project.description}" />
       </td>
       <td>
       <h:message for="prj_desc" />
       </td>
       </tr>
      
       <tr>
       <td>
       </td>
       <td>
       <h:commandButton value="#{otherMsg.create}" action="#{projectAction.createProject}" />
       </td>
       <td>
       </td>
       </tr>
      
       <tr>
       <td colspan="2">
       <rich:dataTable value="#{project.componentCollection}" var="comp">
       <f:facet name="header">
       <rich:columnGroup>
       <rich:column colspan="2">
       #{projMsg.components}
       </rich:column>
       </rich:columnGroup>
       </f:facet>
      
       <rich:column>
       #{comp.name}
       </rich:column>
       <rich:column>
       #{fn:length(comp.name)}
       </rich:column>
      
       <f:facet name="footer">
       <rich:columnGroup>
       <rich:column>
       <h:inputText value="#{component.name}"></h:inputText>
       </rich:column>
       <rich:column>
       <h:commandButton action="#{projectAction.addComponent}" value="Add" />
       </rich:column>
       </rich:columnGroup>
       </f:facet>
       </rich:dataTable>
       </td>
       </tr>
       </table>
       </h:form>


      Here is the code of the backing bean:

      @Stateful
      @Name("projectAction")
      public class ProjectActionBean implements com.amitev.bts.ejb.ProjectActionLocal {
      
       @PersistenceContext
       EntityManager em;
      
       @In
       private User user;
      
       @In @Out
       private Project project;
      
       @In @Out
       private Component component;
      
       @In
       private FacesMessages facesMessages;
      
       @Restrict("#{identity.loggedIn}")
       public String createProject() {
       List results = em.createQuery("from Project pr where pr.name = #{projectAction.project.name}").getResultList();
       if ( results.size()==0 ) {
       project.setOwnerId(user);
       em.persist(project);
       } else {
       facesMessages.addToControlFromResourceBundle("prj_name","project_exists");
       }
       return null;
       }
      
       @Restrict("#{identity.loggedIn}")
       public void addComponent() {
       String componentName = component.getName().trim().toLowerCase();
       boolean contains = false;
       System.out.println(project.getComponentCollection().size());
       for (Component comp: project.getComponentCollection()) {
       System.out.println(comp.getName());
       if (componentName.equalsIgnoreCase(comp.getName())) {
       contains = true;
       }
       }
      
       if (!contains) {
       project.getComponentCollection().add(component);
       component = new Component();
       }
      
       }
      
       @Destroy @Remove
       public void destroy() {}
      
      }
      


      When i add a component the page is redisplayed and the component is shown in the data table. But when i try to add a new component and press the back button i see that the component collection is empty (probably new Project instance is injected). What's the best way to solve this problem with seam?

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