效果圖:
步驟一. 安裝依賴
npm install @ngx-translate/core @ngx-translate/http-loader rxjs --save
@ngx-translate/core包含供翻譯的核心程序:TranslateService和一些管道。
@ngx-translate/http-loader從網絡服務器加載翻譯文件
步驟二. 在app.module.ts中初始化TranslateModule:
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
// import ngx-translate and the http loader
import {TranslateLoader, TranslateModule} from '@ngx-translate/core';
import {TranslateHttpLoader} from '@ngx-translate/http-loader';
import {HttpClient, HttpClientModule} from '@angular/common/http';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
// ngx-translate and the loader module
HttpClientModule,
TranslateModule.forRoot({
loader: {
provide: TranslateLoader,
useFactory: HttpLoaderFactory,
deps: [HttpClient]
}
})
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
// required for AOT compilation
export function HttpLoaderFactory(http: HttpClient) {
return new TranslateHttpLoader(http);
}
步驟三. 在app.component.ts組件中設置默認語言
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(private translate: TranslateService) {
translate.setDefaultLang('en');
}
}
首先,必須構造函數中注入TranslateService。下一步是設置應用程序的默認語言 translate.setDefaultLang('en')。當然,也可以從用戶設置中加載語言。現在,重新加載應用程序會在瀏覽器控制檯中顯示錯誤:
加載資源失敗:服務器響應狀態爲404(未找到)http://localhost:4200/assets/i18n/en.json
這是因爲http加載器現在嘗試從服務器加載默認語言(en)。
步驟四. 在assets文件夾下新建i18n/en.json和zh.json
{
"app": {
"welcome": "Welcome",
"themeSwitch": "Theme switch",
"languageSwitch": "Language switch",
"chinese": "Chinese"
}
}
{
"app": {
"welcome": "歡迎",
"themeSwitch": "主題切換",
"languageSwitch": "語言切換",
"chinese": "中文"
}
}
步驟五. 在app.component.html中使用 translations
<span>{{ 'app.welcome' | translate }}</span>
步驟六. 在app.component.ts文件中,處理點擊事件,實現語言切換
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(private translate: TranslateService) {
translate.setDefaultLang('en')
}
language: string;
ngOnInit() {
this.setLanguage();
}
changeLanguage(lan: string) {
const language = localStorage.getItem('lan');
if (lan !== language) {
this.translate.use(lan);
this.saveLanguage(lan);
}
}
saveLanguage(lan: string) {
localStorage.setItem(`lan`, lan);
}
setLanguage() {
this.language = localStorage.getItem('lan') || 'en'
this.translate.use(this.language);
}
}