使用箭头键，在 Angular 中使用 keyup [英] use arrow keys, with keyup in Angular

问题描述

我有一个 Angular 项目，我想实现一些箭头键的功能，我尝试使用类似 (keyup.[keyCode])="Move(itemArray, 'UP') 的东西_其中 [keyCode] 表示箭头键之一的代码_但没有任何作用，这是我使用它的模板.

<块引用>

模板 (HTML)

 <div (keyup.38)="Move(itemArray, 'UP')"(keyup.37)="移动(itemArray, 'LEFT')"(keyup.40)="移动(itemArray, 'DOWN')"(keyup.39)="移动(itemArray, 'RIGHT')">
<div class="score"><span>最佳:</span>{{最好的}}</div><div class="score"><span>得分:</span>{{分数}}</div></div><br><div class="游戏容器"><div class="网格容器"><div *ngFor="let item of itemArray"><div class="grid-cell-{{item.level|number}}"><span>{{item.level}}</span></div></div></div></div><div class="按钮容器">
<button class="empty"></button></div>
<button class="control-button" (click)="Move(itemArray, 'UP')">Up</button></div>
<button class="empty"></button></div>
<button class="control-button" (click)="Move(itemArray, 'LEFT')">左</button></div>
<button class="control-button" (click)="Move(itemArray, 'DOWN')">向下</button></div>
<button class="control-button" (click)="Move(itemArray, 'RIGHT')">右</button></div></div></div>

解决方案

探索Angular的相关拉取请求，给人的印象是这个功能不支持键码，只支持一组键名.

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

注意使用名称而不是数字.

I have an Angular project, and I want to implement some functions to arrow keys, I tried to use something like (keyup.[keyCode])="Move(itemArray, 'UP') _where [keyCode] represents the code of one of arrow keys_But nothing works, here's the template where I use this.

The Template (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>

解决方案

Exploring Angular's relevant pull request, it created the impression that this feature does not support key codes, but only a set of key names.

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

Notice the usage of names instead of numbers.

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