HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selection length</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #bio { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; min-height: 100px; }
    #stats { margin-top: 10px; padding: 10px; background: #f0fdf4; border-radius: 6px; color: #166534; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <label for="bio">Bio textarea:</label>
  <textarea id="bio">Hello world! Select any portion of this text to see the count.</textarea>
  <div id="stats">Highlight text to see stats.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#bio").on("select", function() {
      var el = this;
      var len = el.selectionEnd - el.selectionStart;
      var text = $(el).val().substring(el.selectionStart, el.selectionEnd);
      $("#stats").text(len + " chars selected: "" + text + """);
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery select event — selected character count (Try It)