Introduction
Angular is a development platform for building WEB, mobile and desktop applications using HTML, CSS and TypeScript (JavaScript). Currently, Angular is at version 15 and Google is the main maintainer of the project.
@ngx-translate is an internationalization (i18n) component library with many configuration options.
Prerequisites
Before you start, you need to install and configure the tools:
- git
- Node.js and npm
- Angular CLI
- IDE (e.g. Visual Studio Code)
Getting started
Create the Angular application
1. Let's create the application with the Angular base structure using the @angular/cli
with the route file and the SCSS style format.
ng new angular-internationalization
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? SCSS [ https://sass-lang.com/documentation/syntax#scss ]
CREATE angular-internationalization/README.md (1073 bytes)
CREATE angular-internationalization/.editorconfig (274 bytes)
CREATE angular-internationalization/.gitignore (604 bytes)
CREATE angular-internationalization/angular.json (3339 bytes)
CREATE angular-internationalization/package.json (1090 bytes)
CREATE angular-internationalization/tsconfig.json (783 bytes)
CREATE angular-internationalization/.browserslistrc (703 bytes)
CREATE angular-internationalization/karma.conf.js (1445 bytes)
CREATE angular-internationalization/tsconfig.app.json (287 bytes)
CREATE angular-internationalization/tsconfig.spec.json (333 bytes)
CREATE angular-internationalization/src/favicon.ico (948 bytes)
CREATE angular-internationalization/src/index.html (313 bytes)
CREATE angular-internationalization/src/main.ts (372 bytes)
CREATE angular-internationalization/src/polyfills.ts (2820 bytes)
CREATE angular-internationalization/src/styles.scss (80 bytes)
CREATE angular-internationalization/src/test.ts (788 bytes)
CREATE angular-internationalization/src/assets/.gitkeep (0 bytes)
CREATE angular-internationalization/src/environments/environment.prod.ts (51 bytes)
CREATE angular-internationalization/src/environments/environment.ts (658 bytes)
CREATE angular-internationalization/src/app/app-routing.module.ts (245 bytes)
CREATE angular-internationalization/src/app/app.module.ts (393 bytes)
CREATE angular-internationalization/src/app/app.component.scss (0 bytes)
CREATE angular-internationalization/src/app/app.component.html (24617 bytes)
CREATE angular-internationalization/src/app/app.component.spec.ts (1139 bytes)
CREATE angular-internationalization/src/app/app.component.ts (233 bytes)
✔ Packages installed successfully.
2. Install and configure the Bootstrap CSS framework. Do steps 2 and 3 of the post Adding the Bootstrap CSS framework to an Angular application.
3. Install the @ngx-translate/core
and @ngx-translate/http-loader
libraries.
npm install @ngx-translate/core @ngx-translate/http-loader
4. Import the HttpClient
, HttpClientModule
, TranslateModule
, TranslateLoader
and TranslateHttpLoader
modules. Change the app.module.ts
file and add the lines as below.
import { HttpClient, HttpClientModule } from '@angular/common/http';
import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';
export function createTranslateLoader(http: HttpClient) {
return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}
imports: [
BrowserModule,
HttpClientModule,
TranslateModule.forRoot({
loader: {
provide: TranslateLoader,
useFactory: (createTranslateLoader),
deps: [HttpClient],
},
defaultLanguage: 'en-US',
}),
AppRoutingModule,
],
5. Create the de-DE.json
, en-US.json
, es-ES.json
, fr-FR.json
and pt-BR.json
files in the src/assets/i18n
folder.
6. Add the content below in the de-DE.json
file.
{
"hello": "Hallo, {{name}}!"
}
7. Add the content below in the en-US.json
file.
{
"hello": "Hello, {{name}}!"
}
8. Add the content below in the es-ES.json
file.
{
"hello": "Hola, {{name}}!"
}
9. Add the content below in the fr-FR.json
file.
{
"hello": "Bonjour, {{name}}!"
}
10. Add the content below in the pt-BR.json
file.
{
"hello": "Olá, {{name}}!"
}
11. Remove the contents of the AppComponent
class from the src/app/app.component.ts
file. Import the TranslateService
service and create the changeLanguage
method as below.
import { Component } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss'],
})
export class AppComponent {
constructor(public translateService: TranslateService) {
}
public changeLanguage(language: string): void {
this.translateService.use(language);
}
}
12. Remove the contents of the src/app/app.component.html
file. Add the buttons as below.
<div class="container-fluid py-3">
<h1>Angular Internationalization (i18n)</h1>
<div class="btn-group btn-group-sm py-5">
<button type="button" class="btn btn-sm btn-outline-secondary" (click)="changeLanguage('de-DE')" [class.active]="translateService.currentLang === 'de-DE'">Deutschland</button>
<button type="button" class="btn btn-sm btn-outline-secondary" (click)="changeLanguage('en-US')" [class.active]="!translateService.currentLang || translateService.currentLang === 'en-US'">English</button>
<button type="button" class="btn btn-sm btn-outline-secondary" (click)="changeLanguage('es-ES')" [class.active]="translateService.currentLang === 'es-ES'">Español</button>
<button type="button" class="btn btn-sm btn-outline-secondary" (click)="changeLanguage('fr-FR')" [class.active]="translateService.currentLang === 'fr-FR'">Francés</button>
<button type="button" class="btn btn-sm btn-outline-secondary" (click)="changeLanguage('pt-BR')" [class.active]="translateService.currentLang === 'pt-BR'">Português</button>
</div>
<h3>{{ "hello" | translate: { name: "Angular" } }}</h3>
</div>
13. Run the application with the command below.
npm start
> angular-internationalization@1.0.0 start
> ng serve
✔ Browser application bundle generation complete.
Initial Chunk Files | Names | Size
vendor.js | vendor | 2.57 MB
styles.css | styles | 266.58 kB
polyfills.js | polyfills | 128.54 kB
scripts.js | scripts | 76.67 kB
main.js | main | 13.03 kB
runtime.js | runtime | 6.66 kB
| Initial Total | 3.05 MB
Build at: 2021-08-15T20:12:53.818Z - Hash: 9462fdcfd1de35681ab4 - Time: 11933ms
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
✔ Compiled successfully.
14. Ready! Access the URL http://localhost:4200/
and check if the application is working. See the application working on GitHub Pages and Stackblitz.
The application repository is available at https://github.com/rodrigokamada/angular-internationalization.
This tutorial was posted on my blog in portuguese.
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