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05. Jun 2008, 20:46 CET | Link |
Hi all, I'm a beginner to Seam. Let say I have Page A and Page B in my application.
In Page A, I have a JSF commandLink below:
<h:commandLink action="#{usersV2Action.getAllUsers}" /> and my session bean as below:
@Stateless
@Name("usersV2Action")
public class UsersV2Action implements IUsersV2 {
@In(required=false) @Out(required=false, scope=ScopeType.EVENT)
private List<UserBeanV2> allUsersList;
public String getAllUsers() {
allUsersList = new ArrayList<UserBeanV2>();
UserBeanV2 ubv2 = new UserBeanV2();
ubv2.setName("User 1");
allUsersList.add(ubv2);
return "/pageB";
}
public void getAllUsersByAjax() {
allUsersList = new ArrayList<UserBeanV2>();
UserBeanV2 ubv2 = new UserBeanV2();
ubv2.setName("User 2");
allUsersList.add(ubv2);
}
}
and Page B codes below:
<t:dataTable id="userDataTable" value="#{allUsersList}" var="user">
<t:column>
<t:outputText value="#{user.name}" />
</t:column>
</t:dataTable>
<a4j:commandLink action="#{usersV2Action.getAllUsersByAjax}" reRender="userDataTable"><t:outputText value="Refresh" /></a4j:commandLink>
In this case, I am using ajax4jsf to refresh the users list.
Which scope type should I use for allUsersList in order to retain the value in the rest of Page B only and not to use Session scope? In addition, I would want the value of allUsersList to be retained in case I press F5 (refresh button).
Try conversation, which is the intent for such a thing. Just remember to start your conversation somewhere. ;)
If you need the data on that single page only and you are not even changing the data, then you can store the list in page scope.
If I am not mistaken you can do that in the getAllUsers() action handler, because writing to page scope in an action handler writes to the new page.
However I would probably rather add a page action for pageB that calls a method that retrieves the values. That way the data will always be present no matter how you navigate to the page (plus the page could be bookmarked).