HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>disable checkboxes</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin: 8px 0; }
    #btn { margin-top: 12px; padding: 10px 16px; background: #dc2626; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #msg { margin-top: 12px; color: #b91c1c; font-weight: 600; }
  </style>
</head>
<body>
  <label><input type="checkbox" class="opt" checked> Option A</label>
  <label><input type="checkbox" class="opt"> Option B</label>
  <label><input type="checkbox" class="opt" checked> Option C</label>
  <button type="button" id="btn">Disable all</button>
  <div id="msg">Click Disable all — uses .prop({ disabled: true }).</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#btn").on("click", function() {
      $("input[type='checkbox']").prop({ disabled: true });
      $("#msg").text("All checkboxes disabled via .prop({ disabled: true }).");
    });
  </script>
</body>
</html>

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jQuery .prop() — disable all checkboxes (Try It)