HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxSuccess success only</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { display: block; margin-bottom: 10px; padding: 8px 14px; cursor: pointer; border-radius: 6px; border: none; text-align: left; }
    #ok { background: #2563eb; color: #fff; }
    #fail { background: #64748b; color: #fff; }
    #log { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 14px; }
    .hint { color: #64748b; font-size: 13px; margin-top: 8px; }
  </style>
</head>
<body>
  <button type="button" id="ok">Successful $.get()</button>
  <button type="button" id="fail">Failed request (HTTP 404)</button>
  <div id="log">ajaxSuccess count: 0</div>
  <p class="hint">404 triggers ajaxError, not ajaxSuccess.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var successCount = 0;

    $(document).on("ajaxSuccess", function() {
      successCount++;
      $("#log").text("ajaxSuccess count: " + successCount);
    });

    $("#ok").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts/1");
    });

    $("#fail").on("click", function() {
      $.get("https://httpbin.org/status/404");
    });
  </script>
</body>
</html>

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jQuery ajaxSuccess — success only vs 404 (Try It)