在 Angular4 中，每当我添加表单标签时，都会出现 No Provider for ControlContainer 错误

Question

起初我在app.module.ts

中添加了ReactiveFormModule

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule, Routes} from '@angular/router';
import { ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { NewproducComponent } from './comp/newproduc/newproduc.component';
import { ProductsComponent } from './comp/products/products.component';
import { SidebarComponent } from './comp/sidebar/sidebar.component';
import { MenubarComponent } from './comp/menubar/menubar.component';


const appRoutes: Routes = [
  { path : '' , component : ProductsComponent},
  { path : 'newproduct' , component : NewproducComponent}
];


@NgModule({
  declarations: [
    AppComponent,
    NewproducComponent,
    ProductsComponent,
    SidebarComponent,
    MenubarComponent
  ],
  imports: [
    BrowserModule,
    ReactiveFormsModule,
    RouterModule.forRoot(appRoutes) 
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule {
 }

app.component.html康坦尼斯

<app-menubar></app-menubar>
<app-sidebar></app-sidebar>
<div class="container">
  <router-outlet></router-outlet>
</div>

newproduc.component.html 包含

<div id="main-body">
  <div class="main-body-header">
            <span>New Product</span>
            <button type="button">Close</button>
            <button type="button">Save</button>
  </div>

  <div class="main-body-component">
    <div class="container">
       <form>

        </form>
    </div>

  </div>

</div>

添加此表单标签时出现以下错误

Error in browser console

无论何时，我都会删除错误删除的表单标签。我不确定我在哪里犯了错误。请帮我解决这个问题。我已经堆积了最后 2 天。

Answer 1

做：

<form [formGroup]="form">

因为您正在导入 ReactiveFormsModule，<form> 标签必须有一个 formGroup。

在 Angular4 中，每当我添加表单标签时，都会出现 No Provider for ControlContainer 错误

In Angular4 whenever I am adding form tag getting No Provider for ControlContainer error

forms

angular-cli

angular-reactive-forms