Angular 8 ngx-bootstrap modal找不到组件工厂

时间:2019-07-10 09:21:50

标签: angular ngx-bootstrap angular8

我有一个看起来像这样的模块:

@NgModule({
  imports: [
    EmployeeRoutingModule,
  ],
  declarations: [
    ListEmployeeComponent,
    EmployeeDialogComponent,
  ],
  providers: [
    EmployeeService,
    BsModalService,
  ],
  entryComponents: [
    EmployeeDialogComponent,
  ]
})
export class EmployeeModule {
}

它像这样导入到应用程序模块中

{
  path: 'employee',
  loadChildren: './employee/employee.module#EmployeeModule'
},

app.routing.ts内。

当我尝试在EmployeeDialogComponent中使用EmployeeModule时,它会不断发出错误消息

ERROR Error: No component factory found for EmployeeDialogComponent. Did you add it to @NgModule.entryComponents?

如果我将其添加到模块中(称为SharedModule),则与在应用运行时(在app.module.ts文件中加载)的方式相同。似乎有点懒惰地使用它。

问题出在哪里,我该如何解决?

以下是无法使用的最小模式的示例:

import {Component, EventEmitter, OnInit, Output} from '@angular/core';
import {BsModalRef} from 'ngx-bootstrap';

@Component({
  selector: 'modal-content',
  template: `
    <div class="modal-body text-center">
      <p class="lead mb-5">{{ message }}</p>
      <button type="button" class="btn btn-lg btn-outline-secondary mr-5" (click)="decline()" >{{ btnNoText }}</button>
      <button type="button" class="btn btn-lg btn-success" (click)="confirm()" >{{ btnYesText }}</button>
    </div>
  `
})
export class ConfirmEmployeeModalComponent implements OnInit {
  @Output() result = new EventEmitter<boolean>();

  message = 'Are you sure?';
  btnNoText = 'No';
  btnYesText = 'Yes';

  constructor(public bsModalRef: BsModalRef) {
  }

  ngOnInit() {}

  confirm(): void {
    this.result.emit(true);
    this.bsModalRef.hide();
  }

  decline(): void {
    this.result.emit(false);
    this.bsModalRef.hide();
  }
}

我在模块ListEmployeeComponent中有一个组件,其中包含这样的功能:

import {
  Component,
  NgZone,
  ElementRef,
  OnInit,
  ViewContainerRef,
  PipeTransform,
  Pipe,
  ViewChild
} from '@angular/core';
import {FormControl} from '@angular/forms';
import {DialogService, BuiltInOptions} from "ngx-bootstrap-modal";
//import { EmployeeDialogComponent } from '../employee-dialog/employee-dialog.component';
import {EmployeeService} from "../employee.service";
import {LocalStorageUtilityService, NotificationService} from "../../common/common.services";
import * as _ from 'lodash';
//import { NotifyDialogComponent } from '../../common/dialog/notify-dialog/notify-dialog.component';
import {UserService} from "../../common/user.service";
import {ConfirmModalComponent} from "../../common/confirm-modal/confirm-modal.component";
import {BsModalService} from "ngx-bootstrap/modal";
import {EmployeeDialogComponent} from "../employee-dialog/employee-dialog.component";
import {ConfirmEmployeeModalComponent} from "../confirm-employee-modal/confirm-modal.component";

@Component({
  templateUrl: 'list-employee.component.html',
  styleUrls: ['./list-employee.component.css']
})
export class ListEmployeeComponent {
  constructor(
    private modalService: BsModalService,
    public _dialogService: DialogService,
    public _companyService: EmployeeService,
    public _notificationService: NotificationService,
    private userService: UserService,
  ) {
  }

  showAddEmployeeDialog = () => {
    this.modalService.show(ConfirmEmployeeModalComponent, {}).content.result.subscribe((details: any) => {
      }
    );
  }
}

2 个答案:

答案 0 :(得分:3)

我设法在this repo中重现了您的问题,并在ModalModule.forRoot()导入中添加了EmployeeModule将解决该错误。

我对MatDialog有类似的问题,因此当我想在已经创建的MatDialog实例(可注射)中使用延迟加载的模块中的组件时,同样的错误。然后,我注意到与延迟加载的组件一起使用时,应该从头开始初始化服务。您的情况也正在发生类似的情况。

根据docs ModalModuleforRoot()一样被导入;

// RECOMMENDED
import { ModalModule } from 'ngx-bootstrap/modal';
// or
import { ModalModule } from 'ngx-bootstrap';

@NgModule({
  imports: [ModalModule.forRoot(),...]
})
export class AppModule(){}

表示BsModalService的全局单例实例已创建并在整个应用程序中使用。而且它在初始化时对延迟加载的组件一无所知。

因此,解决方案是为延迟加载的模块初始化一个新实例,以便在ModalModule.forRoot()导入中添加EmployeeModule可以解决该错误。

@NgModule({
  imports: [
    EmployeeRoutingModule,
    ModalModule.forRoot()
  ],
  declarations: [
    EmployeeDialogComponent,
    ListEmployeeComponent,
  ],
  providers: [
    BsModalService,
  ],
  entryComponents: [
    EmployeeDialogComponent,
  ]
})
export class EmployeeModule {}

但是请注意,这将创建专用于BsModalService的{​​{1}}的新实例,并且不会知道其外部的任何其他上下文,也不会知道任何外部的上下文意识到这一点。简单来说,这意味着您无法与EmployeeModule上下文以外的其他任何位置(例如关闭对话框)进行交互。

答案 1 :(得分:1)

就我而言,解决方案是在模块中添加以下内容:

import {  NgbModule } from '@ng-bootstrap/ng-bootstrap';
imports: [
    NgbModule
]