HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>disable double submit</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #status { margin-top: 12px; padding: 12px; background: #fef3c7; border: 1px solid #f59e0b; }
  </style>
</head>
<body>
  <form id="checkoutForm">
    <input type="text" value="Order #123">
    <input type="submit" value="Place order">
  </form>
  <div id="status">Click submit once.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#checkoutForm").on("submit", function(e) {
      e.preventDefault();
      $(this).find(":submit").prop("disabled", true);
      $("#status").text("Processing… (submit disabled)");
    });
  </script>
</body>
</html>

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Prevent double submit (Try It)