angular 8: "Schematic "拦截器在 Angular cli 中生成拦截器时出现“未在集合中找到”错误

Question

我正在执行命令

ng g interceptor error

其中错误是拦截器的名称

但遇到如下问题：

An unhandled exception occurred: Schematic "interceptor" not found in collection "@schematics/angular".

我们必须先安装任何软件包吗？

Answer 1

似乎在 CLI 9.0.0

中添加了对生成拦截器的原理图支持

因此，您可以升级到 Angular 9，或者编写您自己的自定义原理图，但在短期内，如果您不能/不想升级到 Angular 9，自己编写拦截器可能比生成拦截器更容易。

Answer 2

如果有人想要创建加载拦截器。下面是一个示例加载拦截器，如下所示创建它然后注入 LoadingInterceptor, LoadingIndicatorInterceptor in the provider's array of the parent module.

import { LoadingIndicatorService } from './file-path';
import { Injectable } from '@angular/core';
import {
    HttpEvent,
    HTTP_INTERCEPTORS,
    HttpInterceptor,
    HttpHandler,
    HttpRequest,
  } from '@angular/common/http';
  import { Observable } from 'rxjs';
  import { finalize, tap } from 'rxjs/operators';


@Injectable()
export class LoadingIndicatorInterceptor implements HttpInterceptor {

  constructor(public loadingIndicatorService: LoadingIndicatorService) {}

  intercept (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // emit onStarted event before request execution
    this.loadingIndicatorService.onStarted(req);

    return next
      .handle(req)
      // emit onFinished event after request execution
      .pipe(
        finalize(() => this.loadingIndicatorService.onFinished(req)), tap( r => {
        })
      );
  }
}

export const LoadingInterceptor = {
  provide: HTTP_INTERCEPTORS,
  useClass: LoadingIndicatorInterceptor,
  multi: true,
};

providers: [ LoadingInterceptor, LoadingIndicatorInterceptor] // 这一行应该在您希望拦截器可用的模块中

angular 8: "Schematic "拦截器在 Angular cli 中生成拦截器时出现“未在集合中找到”错误

angular 8: "Schematic "interceptor" not found in collection" error while generating interceptor in Angular cli

angular-http-interceptors

angular

angular8