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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxSend vs ajaxComplete</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { padding: 8px 14px; cursor: pointer; border-radius: 6px; border: none; background: #2563eb; color: #fff; }
    .stats { margin-top: 16px; display: grid; gap: 10px; }
    .stat { padding: 12px; border-radius: 6px; background: #f1f5f9; }
    .stat strong { display: block; margin-bottom: 4px; }
    #order { margin-top: 14px; padding: 12px; background: #ecfdf5; border-radius: 6px; font-size: 14px; line-height: 1.6; }
  </style>
</head>
<body>
  <button type="button" id="run-two">Run two $.ajax() calls</button>
  <div class="stats">
    <div class="stat"><strong>Global ajaxSend count (before send)</strong><span id="send-count">0</span></div>
    <div class="stat"><strong>Global ajaxComplete count (after finish)</strong><span id="complete-count">0</span></div>
  </div>
  <div id="order">Event order log:</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var sendCount = 0;
    var completeCount = 0;

    $(document).on("ajaxSend", function(event, jqXHR, settings) {
      sendCount++;
      $("#send-count").text(sendCount);
      $("#order").append(" ajaxSend →");
    });

    $(document).on("ajaxComplete", function() {
      completeCount++;
      $("#complete-count").text(completeCount);
      $("#order").append(" ajaxComplete →");
    });

    $("#run-two").on("click", function() {
      $.ajax("https://jsonplaceholder.typicode.com/posts/1");
      $.ajax("https://jsonplaceholder.typicode.com/posts/2");
    });
  </script>
</body>
</html>

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jQuery ajaxSend vs ajaxComplete (Try It)