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ランダムな文字列を発生させるサイトをつくる

Posted at 2020-08-18

index.html

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>ランダムな文字列発生させるサイト</title>
    <link
      rel="stylesheet"
      href="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/css/bootstrap.min.css"
      integrity="sha384-r4NyP46KrjDleawBgD5tp8Y7UzmLA05oM1iAEQ17CSuDqnUK2+k9luXQOfXJCJ4I"
      crossorigin="anonymous"
    />

    <style>
      body {
        margin: 0;
        background: #f7f7f7;
      }
      #wrap {
        overflow: hidden;
      }
      main {
        max-width: 750px;
        margin: 0 auto;
      }
    </style>
  </head>
  <body>
    <div id="wrap">
      <br />
      <main>
        <div class="input-group">
          <input type="number" id="num" class="form-control" value="8" />
          <div class="input-group-append">
            <button id="sumbit" class="btn btn-primary" type="button">
              作成
            </button>
          </div>
        </div>

        <br />
        <div class="input-group">
          <input id="text" class="form-control" readonly="" />
          <div class="input-group-append">
            <button id="copy" class="btn btn-success" type="button">
              コピー
            </button>
          </div>
        </div>
      </main>
    </div>
    <script
      src="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/js/bootstrap.min.js"
      integrity="sha384-oesi62hOLfzrys4LxRF63OJCXdXDipiYWBnvTl9Y9/TRlw5xlKIEHpNyvvDShgf/"
      crossorigin="anonymous"
    ></script>

    <script>
      document.getElementById('sumbit').onclick = () => {
        const _s = 'abcdefghijklmnopqrstuvwxyz0123456789';
        const _ret = [...Array(Number(document.getElementById('num').value))]
          .map(() => _s[Math.floor(Math.random() * _s.length)])
          .join('');
        document.getElementById('text').value = _ret;
      };

      document.getElementById('copy').onclick = () => {
        document.getElementById('text').select();
        document.execCommand('copy');
      };
    </script>
  </body>
</html>

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