@ngx-translate with lazy-loaded module in Angular 5

@ngx-translate with lazy-loaded module in Angular 5

To use @ngx-translate with lazy-loaded modules in Angular 5, you need to set up the translation service in both your main application module and the lazy-loaded module. Here's a step-by-step guide:

1. Install @ngx-translate Packages

If you haven't already, install the necessary packages:

npm install @ngx-translate/core @ngx-translate/http-loader --save

2. Set Up TranslateModule in AppModule

In your main app.module.ts, import and configure the TranslateModule:

import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { HttpClientModule, HttpClient } from '@angular/common/http'; import { TranslateModule, TranslateLoader } from '@ngx-translate/core'; import { TranslateHttpLoader } from '@ngx-translate/http-loader'; import { AppComponent } from './app.component'; // Required for AoT compilation export function HttpLoaderFactory(http: HttpClient) { return new TranslateHttpLoader(http); } @NgModule({ declarations: [AppComponent], imports: [ BrowserModule, HttpClientModule, TranslateModule.forRoot({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpClient], }, }), ], bootstrap: [AppComponent], }) export class AppModule {}

3. Set Up the Lazy-loaded Module

In your lazy-loaded module (e.g., feature.module.ts), import TranslateModule again, but this time using forChild():

import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule } from '@ngx-translate/core'; import { FeatureComponent } from './feature.component'; @NgModule({ declarations: [FeatureComponent], imports: [ CommonModule, TranslateModule.forChild(), // Importing forChild here ], }) export class FeatureModule {}

4. Create Translation Files

Create translation JSON files in a folder (e.g., assets/i18n). For example:

assets/i18n/en.json

{ "HELLO": "Hello", "WELCOME": "Welcome to our application!" }

assets/i18n/fr.json

{ "HELLO": "Bonjour", "WELCOME": "Bienvenue dans notre application!" }

5. Use the TranslateService in Components

In your components, you can use the TranslateService to switch languages or translate text:

import { Component } from '@angular/core'; import { TranslateService } from '@ngx-translate/core'; @Component({ selector: 'app-feature', template: ` <h1>{{ 'HELLO' | translate }}</h1> <p>{{ 'WELCOME' | translate }}</p> `, }) export class FeatureComponent { constructor(private translate: TranslateService) { translate.setDefaultLang('en'); translate.use('en'); // Change to 'fr' for French } }

6. Routing and Lazy Loading

Ensure your routing is set up to lazy load the feature module. In your app-routing.module.ts:

import { NgModule } from '@angular/core'; import { RouterModule, Routes } from '@angular/router'; const routes: Routes = [ { path: 'feature', loadChildren: () => import('./feature/feature.module').then(m => m.FeatureModule) }, ]; @NgModule({ imports: [RouterModule.forRoot(routes)], exports: [RouterModule], }) export class AppRoutingModule {}

Conclusion

Now, you have configured @ngx-translate with a lazy-loaded module in Angular 5. You can use the translation service in your components and manage translations dynamically as needed.

Examples

  1. Lazy loading translations with @ngx-translate in Angular

    // In your lazy-loaded module's module file (e.g., lazy.module.ts) import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule, TranslateLoader } from '@ngx-translate/core'; import { TranslateHttpLoader } from '@ngx-translate/http-loader'; import { HttpClientModule, HttpClient } from '@angular/common/http'; // HttpLoaderFactory function for TranslateHttpLoader export function HttpLoaderFactory(http: HttpClient) { return new TranslateHttpLoader(http); } @NgModule({ declarations: [], imports: [ CommonModule, HttpClientModule, TranslateModule.forChild({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpClient] }, isolate: true // Ensures translation files are scoped to this module }) ] }) export class LazyModule { }

    Description: This code snippet demonstrates how to configure @ngx-translate for lazy-loaded modules in Angular. It sets up a TranslateModule with a TranslateHttpLoader to load translation files using HttpClient, scoped specifically to the lazy-loaded module.

  2. Lazy-loaded module with @ngx-translate and specific language initialization

    // In your lazy-loaded module's module file (e.g., lazy.module.ts) import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule, TranslateLoader } from '@ngx-translate/core'; import { TranslateHttpLoader } from '@ngx-translate/http-loader'; import { HttpClientModule, HttpClient } from '@angular/common/http'; // HttpLoaderFactory function for TranslateHttpLoader export function HttpLoaderFactory(http: HttpClient) { return new TranslateHttpLoader(http, './assets/i18n/', '.json'); } @NgModule({ declarations: [], imports: [ CommonModule, HttpClientModule, TranslateModule.forChild({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpClient] }, isolate: true // Ensures translation files are scoped to this module }) ] }) export class LazyModule { constructor(private translate: TranslateService) { // Initialize with specific language this.translate.use('en'); // Example: Initialize with English } }

    Description: This code initializes @ngx-translate in a lazy-loaded module with a specific language (in this case, English). It demonstrates how to set up TranslateModule and TranslateHttpLoader for loading translation files from a specific directory (./assets/i18n/).

  3. Lazy loading translations dynamically with @ngx-translate in Angular

    // In your lazy-loaded module's component or service import { Component } from '@angular/core'; import { TranslateService } from '@ngx-translate/core'; @Component({ selector: 'app-lazy-component', template: '<p>{{ 'HELLO' | translate }}</p>' }) export class LazyComponent { constructor(private translate: TranslateService) { // Load translations dynamically this.translate.setTranslation('en', { 'HELLO': 'Hello World!' }); this.translate.use('en'); } }

    Description: This example shows how to load translations dynamically within a lazy-loaded component or service using @ngx-translate. It sets up TranslateService to load and use translations for a specific language ('en' in this case) with a simple translation key-value pair.

  4. Lazy-loaded module with @ngx-translate and language switching

    // In your lazy-loaded module's component or service import { Component } from '@angular/core'; import { TranslateService } from '@ngx-translate/core'; @Component({ selector: 'app-lazy-component', template: ` <select (change)="switchLanguage($event.target.value)"> <option value="en">English</option> <option value="fr">French</option> </select> <p>{{ 'HELLO' | translate }}</p> ` }) export class LazyComponent { constructor(private translate: TranslateService) { } switchLanguage(language: string) { this.translate.use(language); } }

    Description: This code snippet demonstrates how to implement language switching within a lazy-loaded component using @ngx-translate. It provides a select dropdown to switch between English ('en') and French ('fr') translations dynamically.

  5. Handling multiple languages with @ngx-translate in lazy-loaded modules

    // In your lazy-loaded module's module file (e.g., lazy.module.ts) import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule, TranslateLoader } from '@ngx-translate/core'; import { TranslateHttpLoader } from '@ngx-translate/http-loader'; import { HttpClientModule, HttpClient } from '@angular/common/http'; // HttpLoaderFactory function for TranslateHttpLoader export function HttpLoaderFactory(http: HttpClient) { return new TranslateHttpLoader(http, './assets/i18n/', '.json'); } @NgModule({ declarations: [], imports: [ CommonModule, HttpClientModule, TranslateModule.forChild({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpClient] }, isolate: true // Ensures translation files are scoped to this module }) ] }) export class LazyModule { }

    Description: This module setup ensures @ngx-translate works seamlessly in lazy-loaded Angular modules, loading translation files from ./assets/i18n/ directory with TranslateHttpLoader. It isolates translations to this module to avoid conflicts with other modules.

  6. Using @ngx-translate pipe in lazy-loaded components for translations

    <!-- In your lazy-loaded component's template (e.g., lazy-component.component.html) --> <p>{{ 'HELLO' | translate }}</p>

    Description: This HTML snippet demonstrates usage of @ngx-translate's pipe (translate) within a lazy-loaded component's template to display translated text for the key 'HELLO'.

  7. Loading translations asynchronously with @ngx-translate in lazy-loaded modules

    // In your lazy-loaded module's module file (e.g., lazy.module.ts) import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule, TranslateLoader } from '@ngx-translate/core'; import { TranslateHttpLoader } from '@ngx-translate/http-loader'; import { HttpClientModule, HttpClient } from '@angular/common/http'; // HttpLoaderFactory function for TranslateHttpLoader export function HttpLoaderFactory(http: HttpClient) { return new TranslateHttpLoader(http, './assets/i18n/', '.json'); } @NgModule({ declarations: [], imports: [ CommonModule, HttpClientModule, TranslateModule.forChild({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpClient] }, isolate: true // Ensures translation files are scoped to this module }) ] }) export class LazyModule { }

    Description: This module configuration ensures @ngx-translate loads translations asynchronously in lazy-loaded Angular modules. It utilizes TranslateHttpLoader to fetch translation files (*.json) from the ./assets/i18n/ directory using HttpClient.

  8. Lazy-loaded module with @ngx-translate and handling missing translations

    // In your lazy-loaded module's component or service import { Component } from '@angular/core'; import { TranslateService } from '@ngx-translate/core'; @Component({ selector: 'app-lazy-component', template: ` <p>{{ 'MISSING_KEY' | translate }}</p> <p>{{ getTranslation('ANOTHER_KEY') }}</p> ` }) export class LazyComponent { constructor(private translate: TranslateService) { } getTranslation(key: string): string { return this.translate.instant(key); } }

    Description: This code snippet demonstrates how @ngx-translate handles missing translations within a lazy-loaded component. It shows usage of translate pipe for a missing key ('MISSING_KEY') and instant method for another key ('ANOTHER_KEY').

  9. Lazy-loaded module with @ngx-translate and preloading translations

    // In your lazy-loaded module's component or service import { Component } from '@angular/core'; import { TranslateService } from '@ngx-translate/core'; @Component({ selector: 'app-lazy-component', template: '<p>{{ 'HELLO' | translate }}</p>' }) export class LazyComponent { constructor(private translate: TranslateService) { // Preload translations this.translate.setTranslation('en', { 'HELLO': 'Hello World!' }); this.translate.use('en'); } }

    Description: This code initializes @ngx-translate in a lazy-loaded component with preloaded translations. It sets up TranslateService to load and use translations for English ('en') with a simple translation key-value pair ('HELLO': 'Hello World!').

  10. Using @ngx-translate with lazy-loaded routes in Angular

    // In your lazy-loaded module's module file (e.g., lazy.module.ts) import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { TranslateModule } from '@ngx-translate/core'; import { HttpClientModule, HttpClient } from '@angular/common/http'; import { RouterModule, Routes } from '@angular/router'; // Define routes for lazy-loaded module const routes: Routes = [ { path: '', component: LazyComponent } ]; @NgModule({ declarations: [], imports: [ CommonModule, HttpClientModule, TranslateModule.forChild(), RouterModule.forChild(routes) ] }) export class LazyModule { }

    Description: This module setup demonstrates integration of @ngx-translate with lazy-loaded routes in Angular. It imports TranslateModule.forChild() for translations and RouterModule.forChild(routes) to define routes ('' path maps to LazyComponent).

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