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我正在使用 ngx-translate,现在我想添加一个 LoadingInterceptor。因此,在发出 API 请求时显示 LoadingSpinner 的 HTTPInterceptor。

我已经在使用令牌拦截器。但是当我安装 LoadingInterceptor 时,ngx-translate 不再起作用。

这是我的 loading.interceptor.ts

import { Observable } from 'rxjs';
// import { LoadingService } from './../../../services/loading.service';
import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';

@Injectable()
export class LoadingInterceptor implements HttpInterceptor {

    // Liste von Requests
    private requests: HttpRequest<any>[] = [];

    constructor() {}

    public intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        console.log('detect request', request.url);
        return new Observable(observer => {

        });
    }

}

这是我的 app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';

// Translate
import { TranslateModule, TranslateLoader, TranslateService } from '@ngx-translate/core';
import {TranslateHttpLoader} from '@ngx-translate/http-loader';

// Interceptors
import { HTTP_INTERCEPTORS, HttpClient, HttpClientModule } from '@angular/common/http';
import { TokenInterceptor } from './interceptors/token.interceptor';
import { LoadingInterceptor } from './interceptors/loading.interceptor';

// tslint:disable-next-line:typedef
export function HttpLoaderFactory(http: HttpClient) {
  return new TranslateHttpLoader(http);
}

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    TranslateModule.forRoot({
      defaultLanguage: 'de',
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpClient]
    }
    })
  ],
  providers: [
    [
      {
        provide: HTTP_INTERCEPTORS,
        useClass: LoadingInterceptor,
        multi: true
      },
      {
        provide: HTTP_INTERCEPTORS,
        useClass: TokenInterceptor,
        multi: true
      }
    ],

    TranslateService,
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

这是我的 html 标记,其中包含要翻译的变量:

<span>{{ 'TEST' | translate }}</span>

这是我 i18n 文件夹中的 de.json 文件:

{
    "TEST": "Hello world"
}

我没有收到错误消息,只是不再显示要翻译的变量。除非我注释掉 app.module.ts 中的 LoadingInterceptor。

4

1 回答 1

1

intercept方法应该总是以某种方式返回响应,你的拦截器只是返回一个新的 Observable,它显然不再包含翻译(ngx-translate 从 .json 获取它的翻译,它也被拦截器拦截)。

public intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    console.log('detect request', request.url);
    return next.handle(request);
}

这个拦截器只是简单地返回原始请求而不修改它(无操作)

于 2021-01-12T09:11:37.393 回答