打开模态时如何阻止TAB键事件触发 [英] How to stop TAB key event from firing when a modal is open

问题描述

显示模态时，如何禁用TAB之类的按键事件?我在页面上的表单中有多个按钮和字段，可以通过选择来选择(突出显示).我想在显示模态时禁用它.该应用程序使用Angular，模态位于子组件中.

When the modal is showing, how can I disable key events like TAB? I have multiple buttons and fields in a form on the page that can be selected (focused) by tabbing. I want to disable that when the modal is showing. The application uses Angular and the modal is in a child component.

<button tabindex="0">Button1</button>
<button tabindex="0">Button2</button>
<form>...</form>

<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">...</div>
  </div>
</div>

推荐答案

我建议这样-使用Renderer2并侦听keydown事件并通过keyCode过滤事件.然后在模式隐藏中删除该侦听器.

I'd suggest something like this - use Renderer2 and listen for a keydown event and filter events by keyCode. Then on modal hide remove that listener.

onShow() {
   this.removeTabKeyListener = this.renderer.listen('document', 'keydown', (event) => {
      if (event.keyCode === 9) { 
        event.preventDefault();
      }
    });
}

onHide() {
  this.removeTabKeyListener();
}

一个小例子- http://plnkr.co/edit/LdpmCpgapPbrA26fGO9U?p=preview

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