HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxError vs fail()</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 540px; }
    button { padding: 8px 14px; margin-right: 8px; margin-bottom: 8px; cursor: pointer; border-radius: 6px; border: none; background: #2563eb; color: #fff; }
    button.secondary { background: #64748b; }
    .stats { margin-top: 16px; display: grid; gap: 10px; }
    .stat { padding: 12px; border-radius: 6px; background: #f1f5f9; }
    .stat strong { display: block; margin-bottom: 4px; }
    .note { margin-top: 12px; font-size: 13px; color: #64748b; }
  </style>
</head>
<body>
  <button type="button" id="run-fail">Run two failing $.ajax() calls</button>
  <button type="button" id="run-ok" class="secondary">Run one success call (no ajaxError)</button>
  <div class="stats">
    <div class="stat"><strong>Global ajaxError count</strong><span id="global-count">0</span></div>
    <div class="stat"><strong>Per-request .fail() count</strong><span id="fail-count">0</span></div>
  </div>
  <p class="note">Success requests do not trigger ajaxError — only .fail() runs on errors.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var globalError = 0;
    var perRequestFail = 0;

    $(document).on("ajaxError", function() {
      globalError++;
      $("#global-count").text(globalError);
    });

    $("#run-fail").on("click", function() {
      $.ajax("https://httpbin.org/status/404").fail(function() {
        perRequestFail++;
        $("#fail-count").text(perRequestFail);
      });
      $.ajax("https://httpbin.org/status/500").fail(function() {
        perRequestFail++;
        $("#fail-count").text(perRequestFail);
      });
    });

    $("#run-ok").on("click", function() {
      $.ajax("https://jsonplaceholder.typicode.com/posts/1").fail(function() {
        perRequestFail++;
        $("#fail-count").text(perRequestFail);
      });
    });
  </script>
</body>
</html>
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jQuery ajaxError vs jqXHR.fail() (Try It)
