问题
I want to render the text direction rtl (Right-To-Left) in an inputText when the browser's Accept-Language is arabic in my JSF application. When Accept-Language is english the text introduced by the user would be dir="ltr" (Left-To-Right). How can I do it?
回答1:
The client's Accept-Language is indirectly available via UIViewRoot#getLocale(). The UIViewRoot is in turn in EL available as #{view}. So, this should do:
<h:inputText ... dir="#{view.locale.language eq 'ar' ? 'rtl' : 'ltr'}" />
Note that the dir is also supported on all other components and HTML elements, such as <h:form> and even <html>.
<html ... dir="#{view.locale.language eq 'ar' ? 'rtl' : 'ltr'}">
It would be applied on all its children unless overridden by a differently set dir. That would save you from repeating the very same attribute over all child components/elements.
Also note that the JSF will only accept locales which are explicitly registered in <locale-config> in faces-config.xml. So if you don't already have ar in there, then the above wouldn't work irrespective of Accept-Language header.
<application>
<locale-config>
<default-locale>en</default-locale>
<supported-locale>ar</supported-locale>
...
</locale-config>
</application>
Move if necessary the logic to a managed bean so that you can end up like below:
<h:inputText ... dir="#{localeManager.dir}" />
See also:
- Localization in JSF, how to remember selected locale per session instead of per request/view
来源：https://stackoverflow.com/questions/30629814/jsf-render-dir-rtl-when-language-is-arabic