Is it possible to laod navigation options after querry is displayed

Question

Hi
I have a question concerning the display of a query. Us ut possible to display a query and load the navigation options after the query has been displayed (in other words in the background)?
[I am talking about the query property on how to load a query with option A, H and X]
If yes, does it provide a relevant performance benefit in the case of using large hierarchies?
Thx,
Nana

Answer 1

There is, but the preferred way to do something like this is through
the action reference expression which is attached to a UCommand
component. So you could do something like the following:
1. set up a class which extends javax.faces.Action:
import javax.faces.Action;
public class RegisterAction extends Action {
public String invoke() {
return checkUserName();
Set up an accessor method (javabean convention) in your business
object bean that returns the Action instance:
public class Register {
public Action getRegisterAction() {
return registerAction;
2. set up a mapping for the Navigation Handler (assume user.jsp
is the page where the user enters data, and welcome.jsp is
the page that gets displayed on successful outcome). Set this up
in your faces-config.xml:
<navigation-rule>
<from-tree-id>/user.jsp</from-tree-id>
<navigation-case>
<from-outcome>success</from-outcome>
<to-tree-id>/welcome.jsp</to-tree-id>
</navigation-case>
<navigation-case>
<from-outcome>failure</from-outcome>
<to-tree-id>/user.jsp</to-tree-id>
</navigation-case>
</navigation-rule>
Make sure that the checkUserName() method above, returns a string
that matches the "from-outcome" element in your navigation mapping
(in this case - "success" or "failure").
3. attach the actionRef expression to your button component as follows
in your jsp. Something like:
<h:command_button commandName="register" actionRef="Register.registerAction"/>
Hope this helps, Roger.