无法绑定到"ngForOf"，因为在Angular 9中它不是"tr"的已知属性 [英] Can't bind to 'ngForOf' since it isn't a known property of 'tr' in Angular 9

问题描述

我遇到ngFor无法在我的应用程序中工作的问题.

I'm having a problem that ngFor isn't working in my app.

我将我的应用拆分为单独的模块，并在子模块中包含了import { CommonModule } from '@angular/common';，在app.modules.ts文件中包含了import { BrowserModule } from '@angular/platform-browser';，但是在出现错误后仍然出现错误.

I splited my app into separate modules and included import { CommonModule } from '@angular/common'; into my child module and import { BrowserModule } from '@angular/platform-browser'; into my app.modules.ts file, but I still get the error following error.

Can't bind to 'ngForOf' since it isn't a known property of 'tr'.

我曾尝试研究其他问题，但所有这些问题都包括我自己的CommonModule.

I have tried looking into other questions but all those said to just include CommonModule, which I am.

这些是我的文件:

crud-list.component.html

crud-list.component.html

<table class="table table-bordered table-striped">
  <thead>
    <tr>
      <th>Id</th>
    </tr>
  </thead>
  <tbody>
    <tr *ngFor='let item of cruds'>
      <td>{{item.OrderNumber}}</td>
    </tr>
  </tbody>
</table>

crud-list.component.ts

crud-list.component.ts

import { Component, OnInit } from '@angular/core';
import { CrudRequestService } from '@modules/crud/crud-services/crud-request.service';

@Component({
  selector: 'app-crud-list',
  templateUrl: './crud-list.component.html',
  styleUrls: ['./crud-list.component.scss']
})
export class CrudListComponent {
  public cruds: Array<any>;

  constructor(private objService: CrudRequestService) {
    this.objService.get().subscribe(
      (oDataResult: any) => { this.cruds = oDataResult.value; },
      error => console.error(error)
    );
  }
}

crud.module.ts

crud.module.ts

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Routes, RouterModule } from '@angular/router';

import { CrudListComponent } from '@modules/crud/crud-list/crud-list.component';
import { CrudFormComponent } from '@modules/crud/crud-form/crud-form.component';
import { CrudComponent } from '@modules/crud/crud.component';

const routes: Routes = [
  {
    path: '', component: CrudComponent, children: [
      { path: '', component: CrudListComponent },
      { path: 'create', component: CrudFormComponent },
      { path: 'edit/:id', component: CrudFormComponent }
    ]
  },
];

@NgModule({
  imports: [CommonModule, RouterModule.forChild(routes)],
  declarations: [CrudComponent]
})

export class CrudModule { }

app.module.ts

app.module.ts

/* all the imports */

@NgModule({
  declarations: [
    AppComponent,
    ForbidenAccessComponent,
    PageNotFoundComponent,
    AppHeaderComponent,
    AppFooterComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    NgbModule,
    AppRoutingModule,
    CoreModule
  ],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: JwtInterceptor,
      multi: true,
    },
    BreadcrumbsService,
    AccordionService,
    ModalService,
    RequestService,
    IdentityProviderService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

app-routing.module.ts

app-routing.module.ts

/* imports */

const routes: Routes = [
  { path: 'home', canActivate: [AuthGuard], component: HomeComponent },
  { path: 'crud', canActivate: [AuthGuard], loadChildren: () => import('@modules/crud/crud.module').then(m => m.CrudModule)},
  { path: '', redirectTo: '/home', pathMatch: 'full' },
  // The error status pages
  { path: '403', component: ForbidenAccessComponent },
  { path: '404', component: PageNotFoundComponent },
  { path: '**', redirectTo: '/404' }
];

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forRoot(routes)
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

推荐答案

当我以堆叠式方式重新创建您的问题时，我没有问题.

When I recreate your problem in a stackblitz I don't have an issue.

https://stackblitz.com/edit/angular-60533597

确保将组件添加到模块declarations和Routes.

Make sure that you add your components to the module declarations as well as to the Routes.

这篇关于无法绑定到"ngForOf"，因为在Angular 9中它不是"tr"的已知属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！