HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>undelegate namespace demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin: 8px 0 4px; font-weight: 600; }
    input, button { padding: 8px 12px; margin: 4px 0; }
    button { cursor: pointer; }
    #log { margin-top: 12px; color: #7c2d12; font-weight: bold; min-height: 2em; }
  </style>
</head>
<body>
  <form id="signup">
    <label>Name <input type="text" name="name"></label>
    <button type="button" id="validate-btn">Validate (click.whatever)</button>
    <button type="button" id="off-ns">form.undelegate(".whatever")</button>
  </form>
  <div id="log">Validator runs on button click and text keypress until namespace removed.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var foo = function() {
      $("#log").text("Validator ran on " + (this.tagName || "input") + " at " + new Date().toLocaleTimeString());
    };
    $("form").delegate(":button", "click.whatever", foo);
    $("form").delegate("input[type='text']", "keypress.whatever", foo);
    $("#off-ns").on("click", function() {
      $("form").undelegate(".whatever");
      $("#log").text("All .whatever delegated handlers removed from form.");
    });
  </script>
</body>
</html>

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jQuery .undelegate('.whatever') — namespace cleanup (Try It)