HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>ajaxStart parallel once</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    button { padding: 8px 14px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 6px; }

    .stats { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 14px; line-height: 1.6; }

  </style>

</head>

<body>

  <button type="button" id="run-two">Run two parallel $.get()</button>

  <div class="stats">ajaxStart count: <strong id="start-count">0</strong></div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    var startCount = 0;



    $(document).on("ajaxStart", function() {

      startCount++;

      $("#start-count").text(startCount);

    });



    $("#run-two").on("click", function() {

      $.get("https://jsonplaceholder.typicode.com/posts/1");

      $.get("https://jsonplaceholder.typicode.com/posts/2");

    });

  </script>

</body>

</html>

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jQuery ajaxStart — parallel requests fire once (Try It)