Localization in JSF, how to remember selected locale per session instead of per request/view

by

You need to store the selected locale in the session scope and set it in the viewroot in two places: once by UIViewRoot#setLocale() immediately after changing the locale (which changes the locale of the current viewroot and thus get reflected in the postback; this part is not necessary when you perform a redirect afterwards) and once in the locale attribute of the <f:view> (which sets/retains the locale in the subsequent requests/views).

Here’s an example how such a LocaleBean should look like:

package com.example.faces;

import java.util.Locale;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class LocaleBean {

    private Locale locale;

    @PostConstruct
    public void init() {
        locale = FacesContext.getCurrentInstance().getExternalContext().getRequestLocale();
    }

    public Locale getLocale() {
        return locale;
    }

    public String getLanguage() {
        return locale.getLanguage();
    }

    public void setLanguage(String language) {
        locale = new Locale(language);
        FacesContext.getCurrentInstance().getViewRoot().setLocale(locale);
    }

}

And here’s an example of the view should look like:

<!DOCTYPE html>
<html lang="#{localeBean.language}"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html">
<f:view locale="#{localeBean.locale}">
    <h:head>
        <title>JSF/Facelets i18n example</title>
    </h:head>
    <h:body>
        <h:form>
            <h:selectOneMenu value="#{localeBean.language}" onchange="submit()">
                <f:selectItem itemValue="en" itemLabel="English" />
                <f:selectItem itemValue="nl" itemLabel="Nederlands" />
                <f:selectItem itemValue="es" itemLabel="Español" />
            </h:selectOneMenu>
        </h:form>
        <p><h:outputText value="#{text['some.text']}" /></p>
    </h:body>
</f:view>
</html>

Which assumes that #{text} is already configured in faces-config.xml as below:

<application>
    <resource-bundle>
        <base-name>com.example.i18n.text</base-name>
        <var>text</var>
    </resource-bundle>
</application>

Note that <html lang> is not required for functioning of JSF, but it’s mandatory how search bots interpret your page. Otherwise it would possibly be marked as duplicate content which is bad for SEO.

See also:

More Related Contents:

  1. Internationalization in JSF, when to use message-bundle and resource-bundle?
  2. commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
  3. How to include another XHTML in XHTML using JSF 2.0 Facelets?
  4. Why do I need to nest a component with rendered=”#{some}” in another component when I want to ajax-update it?
  5. h:commandButton/h:commandLink does not work on first click, works only on second click
  6. Spawning threads in a JSF managed bean for scheduled tasks using a timer
  7. How do I process GET query string URL parameters in backing bean on page load?
  8. ViewParam vs @ManagedProperty(value = “#{param.id}”)
  9. How to use enum values in f:selectItem(s)
  10. Obtaining Facelets templates/files from an external filesystem or database
  11. What’s the view build time?
  12. Bean Validation @NotNull, @NotBlank and @NotEmpty does not work in JSF+Tomcat
  13. Difference between Mojarra and MyFaces
  14. How can I set id of a component/tag inside ui:repeat
  15. What is the use of faces-config.xml in JSF 2?
  16. Avoiding duplicate ids when reusing facelets compositions in the same naming container
  17. How to implement a dynamic list with a JSF 2.0 Composite Component?
  18. PrimeFaces validator not fired
  19. How to handle session expiration and ViewExpiredException in JSF 2?
  20. JSF 2 and Post/Redirect/Get?
  21. How does JSF 2 ConversationScope work?
  22. Creating FacesMessage in action method outside JSF conversion/validation mechanism?
  23. JSF does not populate @Named @RequestScoped bean with submitted input values
  24. Initialization of List in a JSF Managed bean
  25. java.lang.IllegalStateException at com.sun.faces.context.FacesContextImpl.assertNotReleased
  26. Read resource bundle properties in a managed bean
  27. How to escape f:selectItem itemLabel attribute
  28. @PreDestroy never called on @ViewScoped [duplicate]
  29. JSF 2 dataTable row index without dataModel
  30. Accessing properties file in a JSF application programmatically

Leave a Comment