HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>type vs namespace</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    button { padding: 8px 16px; }

    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 13px; line-height: 1.8; white-space: pre-wrap; }

  </style>

</head>

<body>

  <button type="button" id="btn">Click me</button>

  <div id="log">Click the button.</div>

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

  <script>

    function log(msg) {

      $("#log").append(msg + "
");

    }

    $("#btn").on("click.pluginA", function (event) {

      log("pluginA → type: " + event.type + ", namespace: " + event.namespace);

    });

    $("#btn").on("click.pluginB", function (event) {

      log("pluginB → type: " + event.type + ", namespace: " + event.namespace);

    });

    $("#btn").on("click", function (event) {

      log("plain → type: " + event.type + ", namespace: " + (event.namespace || "(none)"));

    });

    $("#btn").one("click", function () {

      $("#log").text("");

    });

  </script>

</body>

</html>

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jQuery event.type vs event.namespace (Try It)