angular-material - mat-form-field 必须包含一个 MatFormFieldControl。甚至我添加了 MatFormFieldModule

Question

我是 Angular Material 的新手，请帮助我了解为什么会出现错误。我从 https://material.angular.io/components/form-field/examples 复制了代码

<div class="example-container">
  <mat-form-field>
    <input matInput placeholder="Input">
  </mat-form-field>

  <mat-form-field>
    <textarea matInput placeholder="Textarea"></textarea>
  </mat-form-field>

  <mat-form-field>
    <mat-select placeholder="Select">
      <mat-option value="option">Option</mat-option>
    </mat-select>
  </mat-form-field>
</div>

这与我从该网址复制的代码相同 App.module.ts

import {MatFormFieldModule} from '@angular/material/form-field';
import {MatInputModule} from '@angular/material/input';
  imports: [
MatFormFieldModule,MatInputModule]

Answer 1

看起来你忘记了 MatSelectModule:

import {MatFormFieldModule} from '@angular/material/form-field';
import {MatInputModule} from '@angular/material/input';
import {MatSelectModule} from '@angular/material/select';
...
imports: [MatFormFieldModule,MatInputModule,MatSelectModule]