HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>.ajaxStart() off handler + ajaxStop</title>

  <style>

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

    button { margin-right: 8px; padding: 8px 12px; cursor: pointer; border-radius: 6px; border: none; }

    #fetch { background: #2563eb; color: #fff; }

    #remove { background: #64748b; color: #fff; }

    #loading { display: none; margin-top: 14px; padding: 12px; background: #fef3c7; border-radius: 6px; font-size: 14px; }

  </style>

</head>

<body>

  <button type="button" id="fetch">Trigger $.get()</button>

  <button type="button" id="remove">Remove start handler</button>

  <div id="loading">Loading...</div>

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

  <script>

    var count = 0;



    function onStart() {

      count++;

      $("#loading").show().text("Loading... (ajaxStart count: " + count + ")");

    }



    function onStop() {

      $("#loading").hide();

    }



    $(document).ajaxStart(onStart);

    $(document).ajaxStop(onStop);



    $("#fetch").on("click", function() {

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

    });



    $("#remove").on("click", function() {

      $(document).off("ajaxStart", onStart);

      $("#loading").show().text("Start handler removed — count stays " + count + ".");

    });

  </script>

</body>

</html>

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jQuery .ajaxStart() — remove handler + pair .ajaxStop() (Try It)