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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Migration .ajaxComplete vs .on</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { display: block; width: 100%; margin-bottom: 10px; padding: 10px 14px; cursor: pointer; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff; text-align: left; }
    #legacy { border-color: #fbbf24; }
    #modern { border-color: #34d399; }
    .log { margin-top: 14px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 14px; line-height: 1.5; }
  </style>
</head>
<body>
  <button type="button" id="legacy">Legacy: $(document).ajaxComplete(fn)</button>
  <button type="button" id="modern">Modern: $(document).on("ajaxComplete", fn)</button>
  <div class="log">Click a button, then run a request below.</div>
  <button type="button" id="fetch" style="margin-top:12px;background:#2563eb;color:#fff;border:none;">Run $.get()</button>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var mode = "legacy";

    $("#legacy").on("click", function() {
      mode = "legacy";
      $(".log").text("Mode: legacy .ajaxComplete() — run $.get() to test.");
    });

    $("#modern").on("click", function() {
      mode = "modern";
      $(".log").text("Mode: modern .on('ajaxComplete') — run $.get() to test.");
    });

    $(document).ajaxComplete(function() {
      if (mode === "legacy") {
        $(".log").text("Legacy .ajaxComplete(fn) fired — deprecated since jQuery 3.5.");
      }
    });

    $(document).on("ajaxComplete", function() {
      if (mode === "modern") {
        $(".log").text("Modern .on('ajaxComplete', fn) fired — use this in new code.");
      }
    });

    $("#fetch").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts/1");
    });
  </script>
</body>
</html>

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jQuery .ajaxComplete() vs .on('ajaxComplete') (Try It)