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As easy as conditionals are to use inside a Tapestry template, sometimes it's even easier to do it in Java code.

Missing Keys

Wiki MarkupIf you reference a key that is not in the message catalog, Tapestry does not throw an exception (because that would make initially developing an application very frustrating). When a key can not be located, a "placeholder" message is generated, such as "\[\[missing key: key-not-found\]\]".

Reloading

If you change a property file in a message catalog, you'll see the change immediately, just as with component classes and component templates (provided you're not running in production mode).

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The PersistentLocale service can be used to programmatically override the locale. Note: You should be careful to only set the persistent locale to a supported locale.

@Inject 
private PersistentLocale persistentLocale;

void onActionFromLocaleToggle() {
    if ("en".equalsIgnoreCase(persistentLocale.get().getLanguage())) {
        persistentLocale.set(new Locale("de"));
    } else {
        persistentLocale.set(new Locale("en"));
    }
    return this;
}
public String getDisplayLanguage() {
    return persistentLocale.get().getDisplayLanguage();
}

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Fortunately, Tapestry uses all the same mechanisms for its own locale support as it provides for your application. So, to support other locales, just translate the built-in message catalog (property) files yourself:

{html

}
<style type="text/css">table.sectionMacro { width: auto; }</style>
{html}

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