HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxPrefilter abortOnRetry</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    input { width: 100%; padding: 8px; box-sizing: border-box; border: 1px solid #cbd5e1; border-radius: 6px; }
    .log { margin-top: 14px; padding: 12px; background: #fef3c7; border-radius: 6px; font-size: 14px; }
    .hint { color: #64748b; font-size: 13px; margin-top: 8px; }
  </style>
</head>
<body>
  <label for="search">Search posts (type quickly):</label>
  <input type="text" id="search" placeholder="e.g. sunt">
  <div class="log">Results: —</div>
  <p class="hint">Prefilter aborts stale requests — only the latest keystroke wins.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var currentRequests = {};

    $.ajaxPrefilter(function(options, originalOptions, jqXHR) {
      if (options.abortOnRetry) {
        if (currentRequests[options.url]) {
          currentRequests[options.url].abort();
        }
        currentRequests[options.url] = jqXHR;
      }
    });

    var timer;
    $("#search").on("input", function() {
      clearTimeout(timer);
      var q = $(this).val();
      timer = setTimeout(function() {
        $.ajax({
          url: "https://jsonplaceholder.typicode.com/posts?q=" + encodeURIComponent(q),
          abortOnRetry: true,
          dataType: "json"
        }).done(function(posts) {
          $(".log").text("Results: " + posts.length + " posts for "" + q + """);
        }).fail(function(xhr, status) {
          if (status !== "abort") {
            $(".log").text("Request failed: " + status);
          }
        });
      }, 300);
    });
  </script>
</body>
</html>

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jQuery.ajaxPrefilter() — abortOnRetry pattern (Try It)