Angular 2/4 多语言 国际化支持

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　 ngx-translate ? 包使用

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1. ?安装

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

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2. app.module.ts

import { BrowserModule } from '@angular/platform-browser' ;
import { NgModule } from  '@angular/core' ;
import { FormsModule } from  '@angular/forms' ;
import { HttpModule, Http } from  '@angular/http' ;
import { TranslateModule, TranslateLoader } from  '@ngx-translate/core' ;
import { TranslateHttpLoader } from  '@ngx-translate/http-loader' ;

import { AppComponent } from  './app测试数据ponent' ;

 export     function   createTranslateLoader(http: Http) {
      return   new  TranslateHttpLoader(http, './assets/i18n/', '.json'   );
}
 
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
     TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useFactory: (createTranslateLoader),
                deps: [Http]
            }
        }), 
    FormsModule,
    HttpModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { } 

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加载TranslateModule的loader, parser 或者missing translations handler

 TranslateModule.forRoot();
 
默认的http loader

 TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useFactory: (createTranslateLoader),
                deps: [Http]
            }
        }), 

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实现AOT编译

export  function   createTranslateLoader(http: Http) {
      return   new  TranslateHttpLoader(http, './assets/i18n/', '.json' );
} 

TranslateHttpLoader 加载 "/assets/i18n/[lang].json"? 文件， [lang] 为语言文件名

初始化  TranslateService ?

import { Component } from '@angular/core' ;
import { TranslateService } from  '@ngx-translate/core' ;


@Component({
  selector:  'app-root' ,
  templateUrl:  './app测试数据ponent.html' ,
  styleUrls: [ './app测试数据ponent.css' ]
})
export class AppComponent {

  constructor(public translate: TranslateService) {
          //   this language will be used as a fallback when a translation isn't found in the current language 
        translate.addLangs(["en", "ch" ]);
        
        let browserLang  =  translate.getBrowserLang();
        console.log( "browser languague: " +  browserLang);
        translate.use(browserLang.match( /en|ch/) ? browserLang : 'en' );
    }
} 

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语言文件 /assets/i18n/ch.json

 {
   "HOME" : {
     "TITLE": "你好, Angular ngx-translate!" ,
     "SELECT": "更改语言" 
  }
} 

/assets/i18n/en.json

 {
   "HOME" : {
     "TITLE": "Hello Angular with ngx-translate!" ,
     "SELECT": "Change language" 
  }
} 

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app测试数据ponent.html 文件

 <  div  > 
   <  h2  > {{ 'HOME.TITLE' | translate }} </  h2  > 
   <  label  >  
    {{ 'HOME.SELECT' | translate }}
      <  select   #langSelect (change)  ="translate.use(langSelect.value)"  > 
       <  option   *ngFor  ="let lang of translate.getLangs()"   [value]  ="lang"   [selected]  ="lang === translate.currentLang"  > {{ lang }} </  option  > 
     </  select  > 
   </  label  > 
 </  div  > 

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效果

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