Conditional redirection in JSF

Question

is there a build-in mechanism to conditionally redirect to another view? I want the user to be redirected from the login page to the "home page" if he/she is already logged in.

I already have two basic approaches, but for the first I have no idea how to achieve and the second is sort of a dirty workaround.

Add <meta http-equiv="Refresh" content="0; URL=home.jsf" /> and let it be rendered conditionally (EL : #{login.loggedIn})
Add a <h:panelGroup /> which will also be conditionally rendered, containing some JavaScript doing the redirect.

Is there a way to achieve 1 or even another, more elegant solution? :-)

Thanks

score 19 · Accepted Answer · answered Dec 06 '11 at 12:03

19

You could use <f:event type="preRenderView"> for this.

E.g.

<f:event type="preRenderView" listener="#{login.checkAlreadyLoggedin}" />

with

public void checkAlreadyLoggedin() throws IOException {
    if (isLoggedIn()) {
        ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
        ec.redirect(ec.getRequestContextPath() + "/home.xhtml");
    }
}

answered Dec 06 '11 at 12:03

BalusC

1,082,665
372
3,610
3,555

Perfect! Works like a charme, thanks. In the meantime I discovered and tried another approach: I implemented a filter that was exclusively registered for the log in page, but it failed as I could not manage to access the `@SessionScoped` `login` bean nor the `User` it manages. The session was empty...?! – Kai Dec 06 '11 at 12:37
The filter will only work for a JSF `@ManagedBean`, not for a CDI `@Named` bean. – BalusC Dec 06 '11 at 12:44
Why doesn't returning a String from the listener method of the `preRenderView` event like `return "home.xhtml?faces-redirect=true"` work (doesn't make a redirect)? – Tiny Apr 08 '14 at 22:03
2

@Tiny: because it's a listener method not an action method. Essentially, the listener method is being abused here. That's why JSF guys introduced `` in JSF 2.2, which should be the right tool for the job. – BalusC Apr 09 '14 at 05:43

score 0 · Answer 2 · edited May 23 '17 at 12:32

The solution set out by @BalusC doesn't work in case the view 'home.xhtml' is not the default view of the JSF portlet. For those who need to redirect to a non-default view during the render phase, I suggest the solution set out within this entry. That is, within the preRenderView method do the following:

FacesContext fc = FacesContext.getCurrentInstance();
NavigationHandler navigationHandler = fc.getApplication().getNavigationHandler();
navigationHandler.handleNavigation(fc, null, "/views/nonDefaultView.xhtml?faces-redirect=true");
fc.renderResponse();

Credits to @Frizz1977

Conditional redirection in JSF

2 Answers2

Linked