模块“AppModule”导入的意外值“FormBuilder”。请添加@NgModule 注释答案

【问题标题】：Unexpected value 'FormBuilder' imported by the module 'AppModule'. Please add a @NgModule annotation模块“AppModule”导入的意外值“FormBuilder”。请添加@NgModule 注释
【发布时间】：2019-12-01 01:04:58
【问题描述】：

如何在app.module中添加formbulder

模块 AppModule 导入的非预期值 FormBuilder。请添加@NgModule 注解。

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from "@angular/common/http";
import {FormBuilder, FormControl, FormGroup, Validators, FormsModule} from '@angular/forms';

    import { AppRoutingModule } from './app-routing.module';
    import { AppComponent } from './app.component';
    import { ClientComponent } from './client/client.component';
    import { ClientTaskComponent } from './clienttask/clienttask.component';
    import { ClientService } from './client/sherad/client.service';


    @NgModule({
      declarations: [
        AppComponent, ClientComponent, ClientTaskComponent, ClientService
      ],
      imports: [
        BrowserModule,
        AppRoutingModule,
        HttpClientModule,
        FormsModule,
        FormBuilder,
        FormGroup,
        FormControl
      ],
      providers: [],
      bootstrap: [AppComponent]
    })
    export class AppModule { }

【问题讨论】：

FormBuilder 不需要在模块中导入。您应该在模块中导入ReactiveFormsModule，并在组件中注入FormBuilder。

标签： javascript angular typescript ecmascript-6 single-page-application

【解决方案1】：

在我的代码中运行的真实而简单的解决方案。只需在该特定模块中评论这两个导入，即在我的代码 HomeModule.ts 评论这些 //表单模块， //表单控件

【讨论】：

【解决方案2】：

import { BrowserModule } from '@angular/platform-browser'; import { NgModule } from '@angular/core'; import { HttpClientModule, HTTP_INTERCEPTORS } from "@angular/common/http"; import {FormBuilder, FormControl, FormGroup, Validators, FormsModule} from '@angular/forms'; ........................///Remove this

import { FormsModule, ReactiveFormsModule } from "@angular/forms";..........//Add this

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ClientComponent } from './client/client.component';
import { ClientTaskComponent } from './clienttask/clienttask.component';
import { ClientService } from './client/sherad/client.service';


@NgModule({
  declarations: [
    AppComponent, ClientComponent, ClientTaskComponent, ClientService
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    FormsModule,
    FormBuilder,.........///Remove this
    FormGroup,...........///Remove this
    FormControl..........///Remove this
    ReactiveFormsModule ..........//Add this
], 
providers: [], 
bootstrap: [AppComponent] 
}) 

export class AppModule { }

并将其导入您的 .ts

import {FormBuilder, FormControl, FormGroup, Validators, FormsModule} from '@angular/forms';

永远记住

@NgModule
(

声明仅包含组件

imports 仅包含模块

providers 仅包含服务

【讨论】：

【解决方案3】：

您不能将 FormBuilder 添加到您的模块中，您只能将这些添加到您的模块中

import { FormsModule, ReactiveFormsModule } from "@angular/forms";

imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    FormsModule,
    ReactiveFormsModule
  ],

【讨论】：

【解决方案4】：

imports 数组只接受 Angular 模块。

代替

import {FormBuilder, FormControl, FormGroup, Validators, FormsModule} from '@angular/forms';

只需导入：

import {ReactiveFormsModule} from '@angular/forms';

ReactiveFormsModule 是 FormBuilder、FormControl、FormGroup、Validators 等暴露的模块。因此，要使用它们，您必须在 Angular 模块中导入 ReactiveFormsModule。

并添加 imports 数组。

@NgModule({
  declarations: [
    AppComponent, ClientComponent, ClientTaskComponent, ClientService
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    FormsModule,
    ReactiveFormsModule,
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule {}

FormBuilder、FormControl、FormGroup、Validators 等只能在组件/服务中导入并在那里使用。 Angular 模块文件中并不真正需要它们。

【讨论】：