未捕获错误：模块“AppModule”导入的意外指令“MatFormField”。请添加@NgModule注释

Question

我想使用Angular Material Date选择器但我收到此错误。

未捕获错误：模块“AppModule”导入的意外指令“MatFormField”。请添加@NgModule注释。

app.component.html

<mat-form-field>
  <input matInput [matDatepicker]="picker" placeholder="Choose a date">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';
import {MatFormField} from '@angular/material';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    MatFormField
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer 1

要导入组件和指令等，请导入其模块，而不是实际的组件和指令。所以你需要导入MatFormFieldModule而不是MatFormField：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';
import { MatFormFieldModule } from '@angular/material/form-field';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    MatFormFieldModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }