angular - 错误 : No providers for Component

Question

我有一个指令，我在其中定义了一个单选按钮，我想调用一个组件的方法..
当我在构造函数中注入(inject)组件时，出现此错误:ERROR Error: No provider for FoldersComponent!
指令.ts

   import { FoldersComponent } from '../folders/folders.component';
import { Directive, ElementRef, HostListener, Input, AfterViewInit, ViewChild, EventEmitter, Output } from '@angular/core';

declare var jQuery: any;

@Directive({
  selector: '[icheck]'
})

export class IcheckDirective implements AfterViewInit {

  @Output('icheck')
  callComponentFunction: EventEmitter<any> = new EventEmitter<any>();
  constructor(private el: ElementRef, private parentCmp: FoldersComponent) {
    jQuery(this.el.nativeElement).iCheck({
      checkboxClass: 'icheckbox_square-aero',
      radioClass: 'iradio_square-aero'
    }).on('ifChecked', function(event) {
      if (jQuery('input').attr('type') === 'radio') {
        this.parentCmp.selectType();
      }
    });
  }

  ngAfterViewInit(): void {
  }
}

文件夹.component.ts

@Component({
  selector: 'app-folders',
  templateUrl: './folders.component.html',
  styleUrls: ['./folders.component.css'],
})
export class FoldersComponent implements OnInit {
   constructor(
    private route: ActivatedRoute,
    private router: Router
  ) {  }

  selectType() {
    //    alert();
    console.log("Ici");
  }
}

文件夹.component.html

<input type="radio" icheck name="filters.type" [(ngModel)]="filters.type"                   value="IN"> (IN)

我的@NgModule

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    FoldersComponent,
  ],

Answer 1

看来你错过了注册FoldersComponent至@NgModule({})
你能把你的主文件贴在你用过的地方吗NgModule