node.js - 尝试添加 Angular Material 时组件加载错误

Question

我正在尝试在我的 Angular 项目中添加 Angular Material 。我添加了 Angular Material ，下面是我的文件。

app.module.ts

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

  import { AppRoutingModule } from './app-routing.module';
  import { AppComponent } from './app.component';
  import {MatButtonModule, MatCheckboxModule} from '@angular/material';

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

app.component.ts

  import { Component } from '@angular/core';

  @Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
  })
  export class AppComponent {

    title = 'sp';
  }

app.component.html

  <mat-menu #appMenu="matMenu">
    <button mat-menu-item>Settings</button>
    <button mat-menu-item>Help</button>
  </mat-menu>

  <button mat-icon-button [matMenuTriggerFor]="appMenu">
    <mat-icon>more_vert</mat-icon>
  </button>
  <router-outlet></router-outlet>

我在运行时遇到错误:

There is no directive with "exportAs" set to "matMenu" ("]#appMenu="matMenu"> Settings Help "): ng:///AppModule/AppComponent.html@0:10 'mat-menu' is not a known element: 1

Answer 1

您必须导入 MatMenuModule使用选择器mat-menu

imports: [
      BrowserModule,
      AppRoutingModule,
      MatButtonModule, 
      MatCheckboxModule,
      MatMenuModule
]