test/test.html at master · wddo/test · GitHub

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<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <style>
      .btns {
        text-wrap: nowrap;
        overflow: hidden; width: 100px; height: 20px; border: 1px solid red
      }
    </style>
  </head>
  <body>
    <div class="wrap">
      <br /><br /><br /><br /><br /><br /><br />
      <div class="btns" tabindex="0">
        <a href="#" role="button">btn 1</a>
        <a href="#" role="button">btn 2</a>
        <a href="#" role="button">btn 3</a>
        <a href="#" role="button">btn 4</a>
      </div>
      <div class="trace"></div>
    </div>
    <script>
      $(function () {
        const btns = document.querySelector('.btns')
        const a = document.querySelector('a')

        btns.addEventListener("scroll", (e) => {
          trace(`btns - ${e.type}`)
        });

        btns.addEventListener('focus', (e) => {
          trace(`btns - ${e.type}`)
        })

        a.addEventListener('focus', (e) => {
          trace(`${e.target.textContent} - ${e.type}`)
        })

        a.addEventListener('blur', (e) => {
          trace(`${e.target.textContent} - ${e.type}`)
        })
      })

      function trace(msg) {
        $('.trace').append(`<p>${msg}</p>`)
      }
    </script>
  </body>
</html>