使用箭头键,使用Angular中的键盘

Question

我有一个Angular项目,我想实现箭头键的一些功能,我试图使用类似(keyup.[keyCode])="Move(itemArray, 'UP')_where [keyCode]代表箭头键之一的代码.没有任何作用,这里是我使用它的模板.

模板(HTML)

 <div (keyup.38)="Move(itemArray, 'UP')"
     (keyup.37)="Move(itemArray, 'LEFT')"
     (keyup.40)="Move(itemArray, 'DOWN')"
     (keyup.39)="Move(itemArray, 'RIGHT')">
  <div>
    <div class="score">
      <span>Best:</span>
      {{best}}
    </div>
    <div class="score">
      <span>Score:</span>
      {{score}}
    </div>
  </div> <br>
  <div class="game-container">
    <div class="grid-container">
      <div *ngFor="let item of itemArray">
        <div class="grid-cell-{{item.level|number}}">
          <span>{{item.level}}</span>
        </div>
      </div>
    </div>
  </div>
  <div class="button-container">
    <div>
      <button class="empty"></button>
    </div>
    <div>
      <button class="control-button" (click)="Move(itemArray, 'UP')">Up</button>
    </div>
    <div>
      <button class="empty"></button>
    </div>
    <div>
      <button class="control-button" (click)="Move(itemArray, 'LEFT')">Left</button>
    </div>
    <div>
      <button class="control-button" (click)="Move(itemArray, 'DOWN')">Down</button>
    </div>
    <div>
      <button class="control-button" (click)="Move(itemArray, 'RIGHT')">Right</button>
    </div>
  </div>
</div>

Answer 1

探索Angular的相关拉取请求,它产生的印象是此功能不支持键代码,而只支持一组键名.

(keyup.arrowup)="Move(itemArray, 'UP')"
(keyup.arrowleft)="Move(itemArray, 'LEFT')"
(keyup.arrowdown)="Move(itemArray, 'DOWN')"
(keyup.arrowright)="Move(itemArray, 'RIGHT')"

注意使用名称而不是数字.

Answer 2

如果您只想输入密钥，您可以执行以下操作：

   <button class="control-button" (keydown)="move($event)"></button>

    move(event: any) {
         console.log(event.keyCode);
    }