Scopes problem
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?
