HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>:input select</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    p { color: #2563eb; font-weight: 600; min-height: 1.4em; }
    input, textarea { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    .hint { color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <p class="hint">Click and drag to select text in either field:</p>
  <input type="text" value="First input field">
  <textarea rows="3">Second field — a textarea with more text to highlight.</textarea>
  <p id="notice"></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(":input").on("select", function() {
      $("#notice").text("Something was selected").show().fadeOut(1000);
    });
  </script>
</body>
</html>

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jQuery select event — :input fade notice (Try It)