HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>flag variable</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    button { padding: 10px 16px; border: none; border-radius: 6px; cursor: pointer; margin-right: 8px; }
    button[type="submit"] { background: #6366f1; color: #fff; }
    #enable { background: #10b981; color: #fff; }
    #status { margin-top: 12px; padding: 10px; background: #fef3c7; border-radius: 6px; color: #92400e; font-size: 14px; }
  </style>
</head>
<body>
  <form id="gate" action="/demo" method="get">
    <label for="code">Access code</label>
    <input type="text" id="code" name="code" placeholder="Enter code">
    <button type="submit">Submit</button>
  </form>
  <button type="button" id="enable">Enable submit</button>
  <div id="status">Submit blocked until you click Enable.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var allowSubmit = false;
    $("#gate").on("submit", function() {
      return allowSubmit;
    });
    $("#enable").on("click", function() {
      allowSubmit = true;
      $("#status").text("Submit enabled — try the form again.");
    });
  </script>
</body>
</html>

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jQuery submit event — flag variable pattern (Try It)