Ionic 4无法导入自定义组件不是已知元素 [英] Ionic 4 cannot import custom component is not a know element

问题描述

我是Ionic的新手，我想创建一个自定义列表视图，其中包含可扩展项，并通过以下链接:

I am new to Ionic and I want to create a custom listview with expandable items following this link : https://www.joshmorony.com/creating-an-accordion-list-in-ionic/.

问题是我的自定义组件从未被识别，我尝试了很多事情，但无济于事...我使用的是Ionic 4，他们没有在文档中谈论组件的生成.

The problem is that my custom component is never recognized, I have tried many things but nothing works... I am using Ionic 4 and they do not talk of component generation in their doc.

错误是:

Error: Template parse errors:
'expandable' is not a known element:
1. If 'expandable' is an Angular component, then verify that it is part of this module.
2. To allow any element add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.

这是我的项目文件夹

expandable.component.html:

expandable.component.html :

<div #expandWrapper class='expand-wrapper' [class.collapsed]="!expanded">
    <ng-content></ng-content>
</div>

expandable.component.ts:

expandable.component.ts :

import { Component, Input, ViewChild, ElementRef, Renderer } from '@angular/core';

@Component({
  selector: 'app-expandable',
  templateUrl: './expandable.component.html',
  styleUrls: ['./expandable.component.scss']
})
export class ExpandableComponent {

  @ViewChild('expandWrapper', {read: ElementRef}) expandWrapper;
  @Input('expanded') expanded;
  @Input('expandHeight') expandHeight;

  constructor(public renderer: Renderer) {
  }

  ngAfterViewInit(){
      this.renderer.setElementStyle(this.expandWrapper.nativeElement, 'height', this.expandHeight + 'px');   
  }

}

这就是我尝试使用它的方式:

And here is how I am trying to use it :

<expandable [expandHeight]="itemExpandHeight" [expanded]="pet.expanded">
      Hello people
</expandable>

最后，我的app.module.ts:

Finally, my app.module.ts :

@NgModule({
  declarations: [AppComponent, ExpandableComponent],
  entryComponents: [],
  imports: [
    BrowserModule,
    IonicModule.forRoot(), 
    AppRoutingModule,
    IonicStorageModule.forRoot()
  ],
  providers: [
    StatusBar,
    SplashScreen,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
    DatabaseService, 
    PetService,
    SQLite
  ],
  bootstrap: [AppComponent]
})

推荐答案

我找到了解决方案，您必须在组件的根目录下创建component.module.ts，然后添加导入文件ComponentsModule

I found the solution, you have to create a component.module.ts at the root of your component, and then add in your imports ComponentsModule

component.module

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