Vaadin Flow app with I18N Page Title, dynamically created

What I want to show in this example is, how you could deal with a dynamic page title per view (or time or what ever) that will handle your browser Locale as well.

All tutorials are available under https://vaadin.com/tutorials

recommended to read before

It is recommended to read the tutorial about the I18NProvider first. This tutorial will use the I18NProvider.

The Solution

After playing around a few times, I developed a a solution that could handle

• message bundles
• is not inside inheritance
• is based on Annotations
• is easy to extend
• can change the language during runtime

The developer / user view

Mostly it is a good approach to develop a solution for a developer from the perspective of a developer. Here it means, what should a developer see if he/she have to use your solution.

The developer will see this Annotation. Three things can be defined here.

• The message key that will be used to resolve the message based on the actual Locale
• A default value the will be used, if no corresponding resource key was found neither fallback language is provided
• Definition of the message formatter, default Formatter will only return the translated key.

@Retention(RetentionPolicy.RUNTIME)
public @interface I18NPageTitle {
  String messageKey() default "";
  String defaultValue() default "";
  Class< ? extends TitleFormatter> formatter() default DefaultTitleFormatter.class;
}

The default usage should look like the following one.

@Route(View003.VIEW_003)
@I18NPageTitle(messageKey = "view.title")
public class View003 extends Composite<Div> implements HasLogger {
  public static final String VIEW_003 = "view003";
}

For more detailed informations about how to implement it, have a look at our tutorial about I18N - Dynamic PageTitle at https://vaadin.com/tutorials

If you have questions or something to discuss.. ping me via email mailto::sven.ruppert@gmail.com or via Twitter : https://twitter.com/SvenRuppert