HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.error() trigger</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    #book { max-width: 160px; border: 2px dashed #6366f1; border-radius: 8px; display: block; margin-bottom: 12px; }
    #other { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #out { margin-top: 12px; color: #4338ca; font-weight: bold; }
  </style>
</head>
<body>
  <img id="book" src="https://via.placeholder.com/160/22c55e/ffffff?text=OK" alt="Cover" width="160" height="100">
  <br>
  <button type="button" id="other">Trigger with .error()</button>
  <div id="out">Click to fire no-argument .error().</div>
  <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  <script>
    $("#book").error(function() {
      $("#out").text("Handler for error called (via .error() trigger).");
    });
    $("#other").on("click", function() {
      $("#book").error();
    });
  </script>
</body>
</html>

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jQuery .error() — no-arg trigger (Try It)