HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>val callback upper</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 480px; }

    input { padding: 10px; width: 100%; box-sizing: border-box; border: 2px solid #94a3b8; border-radius: 6px; }

    p { color: #64748b; margin-top: 10px; font-size: 14px; }

  </style>

</head>

<body>

  <input type="text" placeholder="Type and tab out">

  <p>Type something and then click or tab out of the input.</p>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("input").on("blur", function() {

      $(this).val(function(i, val) {

        return val.toUpperCase();

      });

    });

  </script>

</body>

</html>

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jQuery .val() — callback uppercase (Try It)