JavaEE AngularJS Bootstrap: How to Multilingual (i18n, l10n)

Damien FREMONT IT Tutorials, , , , , , , , , , , ,

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This is about dynamic Internationalization (i18n*), Localization (L10n*) , Globalization (i18n* and L10n*) and Cookies storage with angular-translate and agular-dynamic-locale.

Demo

http://localhost:8080/20151106-javaee-angularjs-bootstrap-multilingual-i18n-l10n/

A simple content where language and locale can be change by country.

ScreenShot001

Here are three countries, including two with the same language (i18n) but different currency and date format (l10n).

  • English (US): lang=en, locale=us
  • English (GB): lang=en, locale=gb
  • French (FR): lang=fr, locale=fr

ScreenShot002

By switching from US to GB, only currency and date format has changed (l10n).

ScreenShot003

With FR: language, date and currency change.

ScreenShot004

ScreenShot005

For each language, there are two files.

  • An l10n locale file (format of date, currency, calendar,etc)

ScreenShot006

  • An i18n language file (text, label translation)

 

ScreenShot007

By default, your browser language is used. But if the app does not know this language, it fallbacks to ‘English (US)’ …until you choose another with the menu.

Because this app use browser locale, cookie and fallback language, there are three scenarios at startup.

  1. 1st time : no cookies
    1. browser language is supported by the app (English or French)  => it will be the default language
    2. browser language is not supported (Deutch?) => the app fallbacks to English
  2. 2nd time : cookies
    1. => the app use the previous used language

ScreenShot008

Source

ScreenShot009

i18n/locale-en.json

{
"PARAGRAPH": "This is a paragrah in english."
}

i18n/locale-fr.json

{
"PARAGRAPH": "C’est un paragraphe en français."
}

web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
     http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <servlet>
    <servlet-name>WEBJARS</servlet-name>
    <servlet-class>org.webjars.servlet.WebjarsServlet</servlet-class>
    <init-param>
      <param-name>disableCache</param-name>
      <param-value>true</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>WEBJARS</servlet-name>
    <url-pattern>/webjars/*</url-pattern>
  </servlet-mapping>

</web-app>

app.js

'use strict';

var app = angular.module('app', 
  [ 'ngCookies',
    'pascalprecht.translate',
    'tmh.dynamicLocale']);

// i18n: LANGUAGE
app.config( function ($translateProvider) {
	
  // ADD LANG
  $translateProvider
  .useStaticFilesLoader({
    prefix: 'i18n/locale-',
    suffix: '.json'
  })
  
  // REMEMBER
  .preferredLanguage('en')
  .fallbackLanguage('en')
  .useCookieStorage()
  
  // SECURITY
  .useSanitizeValueStrategy('escape');
});

// l10n: LOCALE
app.config(function(tmhDynamicLocaleProvider) {
  const locales = 'webjars/angular-i18n/1.4.7/angular-locale_{{locale}}.js';
  tmhDynamicLocaleProvider

  // REMEMBER
  .localeLocationPattern(locales)
  .useCookieStorage();
})

app.controller('MainCtrl', function($window, $scope, $translate, $cookieStore, tmhDynamicLocale, tmhDynamicLocaleCache, $rootScope, $locale) {
  
  $scope.availableLocales = {
    'en-us': 'English (US)',
    'en-gb': 'English (GB)',
    'fr-fr': 'French (FR)'
  };
  
  // CHANGE LANG
  $scope.changeLocale = function(key) {
    $rootScope.model = {selectedLocale: key};
	// i18n
	var langKey = key.substring(0,2);
    $translate.use(langKey);
    // l10n
    tmhDynamicLocale.set(key);
  }
  
  // INIT
  $rootScope.$locale = $locale;
  var lang = $cookieStore.get('tmhDynamicLocale.locale');;
  if(!lang) {
	  lang = $window.navigator.language || $window.navigator.userLanguage;
  }
  $scope.changeLocale(lang);
  
});

index.jsp

<!DOCTYPE html>
<html ng-app="app">
<head>
<!-- LIBS CSS -->
<link rel="stylesheet" href="webjars/bootstrap/${bootstrap.version}/css/bootstrap.css">
<!-- LIBS JS -->
<script src="webjars/jquery/${jquery.version}/jquery.js"></script>
<script src="webjars/bootstrap/${bootstrap.version}/js/bootstrap.js"></script>
<script src="webjars/angularjs/${angularjs.version}/angular.js"></script>
<script src="webjars/angularjs/${angularjs.version}/angular-route.js"></script>
<script src="webjars/angularjs/${angularjs.version}/angular-resource.js"></script>
<script src="webjars/angularjs/${angularjs.version}/angular-cookies.js"></script>
<script src="webjars/angular-translate/${angular-translate.version}/angular-translate.js"></script>
<script src="webjars/angular-translate-storage-cookie/${angular-translate-storage-cookie.version}/angular-translate-storage-cookie.js"></script>
<script src="webjars/angular-translate-loader-static-files/${angular-translate-loader-static-files.version}/angular-translate-loader-static-files.js"></script>
<script src="webjars/angular-dynamic-locale/${angular-dynamic-locale.version}/dist/tmhDynamicLocale.js"></script>
<!-- YOUR JS -->
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<div class="container">
<h1>Multilingual</h1>

<!-- CHANGE LANGUAGE -->
<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" data-toggle="dropdown">
    <i class="glyphicon glyphicon-menu-hamburger"></i>
     Language ({{model.selectedLocale}})
     <span class="caret"></span>
  </button>
  <ul class="dropdown-menu">
    <li ng-repeat="(key, value) in availableLocales">
      <a href="#" 
        ng-click="changeLocale(key)">
      <img src="img/flag_icons/{{key | limitTo:2:3}}.png" /> 
      {{value}}</a></li>
  </ul>
</div>
<br/>
<div class="alert alert-info col-md-5">
<p>Current locale id: {{$locale.id}}</p>
<br/>
  
<!-- i18n: LANGUAGE -->
<strong>i18n: LANGUAGE</strong>
<p>{{ 'PARAGRAPH' | translate }}</p>
  
<br/>

<!-- l10n: LOCALE -->
<strong>l10n: LOCALE</strong>
<p>A big number: {{1234567890 | number}}</p>
<p>The Epoch was on: {{0 | date:'longDate'}}</p>
<p>The Time was on: {{0 | date:'shortTime'}}</p>
<p>One million of the local currency: {{1000000 | currency}}</p>
</div>

</div>
</body>
</html>

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.damienfremont.blog</groupId>
  <artifactId>20151106-javaee-angularjs-bootstrap-multilingual</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <!-- JAVAEE -->
    <java.version>7</java.version>
    <javaee.version>7.0</javaee.version>
    <jersey.version>2.22.1</jersey.version>
    <!-- WEB -->
    <bootstrap.version>3.3.5</bootstrap.version>
    <angularjs.version>1.4.7</angularjs.version>
    <angular-translate.version>2.8.1</angular-translate.version>
    <angular-translate-storage-cookie.version>2.8.0</angular-translate-storage-cookie.version>
    <angular-translate-loader-static-files.version>2.6.1</angular-translate-loader-static-files.version>
    <angular-dynamic-locale.version>0.1.28</angular-dynamic-locale.version>
    <angular-i18n.version>1.4.7</angular-i18n.version>
    <jquery.version>2.1.4</jquery.version>
  </properties>

  <dependencies>

    <!-- JAVA -->

    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>${javaee.version}</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.glassfish.jersey.containers</groupId>
      <artifactId>jersey-container-servlet</artifactId>
      <version>${jersey.version}</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.media</groupId>
      <artifactId>jersey-media-json-jackson</artifactId>
      <version>${jersey.version}</version>
    </dependency>

    <!-- WEB -->

    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>webjars-servlet-2.x</artifactId>
      <version>1.1</version>
    </dependency>

    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>bootstrap</artifactId>
      <version>${bootstrap.version}</version>
    </dependency>

    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>angularjs</artifactId>
      <version>${angularjs.version}</version>
    </dependency>
    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>jquery</artifactId>
      <version>${jquery.version}</version>
    </dependency>
    <!-- i18n: LANGUE -->
    <dependency>
      <groupId>org.webjars.bower</groupId>
      <artifactId>angular-translate</artifactId>
      <version>${angular-translate.version}</version>
    </dependency>
    <dependency>
      <groupId>org.webjars.bower</groupId>
      <artifactId>angular-translate-storage-cookie</artifactId>
      <version>${angular-translate-storage-cookie.version}</version>
    </dependency>
    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>angular-translate-loader-static-files</artifactId>
      <version>${angular-translate-loader-static-files.version}</version>
    </dependency>
    <!-- l10n: LOCALE -->
    <dependency>
      <groupId>org.webjars.bower</groupId>
      <artifactId>angular-dynamic-locale</artifactId>
      <version>${angular-dynamic-locale.version}</version>
    </dependency>  
    <dependency>
      <groupId>org.webjars.bower</groupId>
      <artifactId>angular-i18n</artifactId>
      <version>${angular-i18n.version}</version>
    </dependency>  

  </dependencies>
  <build>
    <resources>
      <resource>
        <directory>src/main/webapp</directory>
        <filtering>true</filtering>
        <targetPath>${project.basedir}/target/m2e-wtp/web-resources</targetPath>
        <includes>
          <include>*.jsp</include>
        </includes>
      </resource>
    </resources>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.6</version>
        <configuration>
          <webResources>
            <resource>
              <directory>src/main/webapp</directory>
              <filtering>true</filtering>
              <includes>
                <include>*.jsp</include>
              </includes>
            </resource>
          </webResources>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.${java.version}</source>
          <target>1.${java.version}</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

Project

https://github.com/DamienFremont/blog/tree/master/20151106-javaee-angularjs-bootstrap-multilingual-i18n-l10n

References

https://docs.angularjs.org/guide/i18n

http://www.ng-newsletter.com/posts/angular-translate.html

https://github.com/SlexAxton/messageformat.js

https://docs.angularjs.org/api/ngCookies/service/$cookies

http://www.famfamfam.com/lab/icons/flags/

https://docs.angularjs.org/api/ng/filter/date

https://github.com/lgalfaso/angular-dynamic-locale

6 thoughts on “JavaEE AngularJS Bootstrap: How to Multilingual (i18n, l10n)”

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