无法导入反应式表单模块

Question

在app.module.ts中导入ReactiveFormsModule时，出现错误：

compiler.js:2427 Uncaught Error: Template parse errors:
No provider for ControlContainer ("<div class="container">
    <div class="row">
      [ERROR ->]<form class="col s12" id="reg-form">
        <div class="row">
          <div class="input-field col "): ng:///AppModule/LoginComponent.html@2:6
.
.
.

有人知道是什么原因造成的吗？这可能是模块的问题，因为当我删除所有 HTML 时，我仍然会得到它，并且我像在文档中一样导入它。当我删除导入应用程序时，没有错误。

Answer 1

这是导入，当然没有箭头：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
-> import { ReactiveFormsModule } from '@angular/forms';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { LoginComponent } from './components/login/login.component';
import { RegisterComponent } from './components/register/register.component';
import { HeaderComponent } from './components/header/header.component';
import { FooterComponent } from './components/footer/footer.component';
import { SidenavComponent } from './components/sidenav/sidenav.component';
import { MyworksheetsComponent } from './components/myworksheets/myworksheets.component';
import { AddworksheetComponent } from './components/addworksheet/addworksheet.component';
import { ProfileComponent } from './components/profile/profile.component';
import { ValidateService } from './services/validate/validate.service';
import { UserService } from './services/user/user.service';
@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    RegisterComponent,
    HeaderComponent,
    FooterComponent,
    SidenavComponent,
    MyworksheetsComponent,
    AddworksheetComponent,
    ProfileComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    -> ReactiveFormsModule
  ],
  providers: [
    ValidateService,
    UserService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

我创建了一个新的测试应用程序并且它可以工作，所以模块或 im 如何导入它不是问题。

Answer 2

您需要将指令添加到在所有组件中创建的任何表单中.html例：

<form [formGroup]=""> </form>

通过这样做，可以消除错误。