HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Custom event type</title>

  <style>

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

    textarea { width: 100%; height: 80px; box-sizing: border-box; padding: 8px; }

    button { margin-top: 8px; padding: 8px 16px; }

    #status { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; }

  </style>

</head>

<body>

  <textarea id="editor" placeholder="Write something…"></textarea>

  <button type="button" id="save">Save draft</button>

  <div id="status">Click Save draft.</div>

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

  <script>

    $("#editor").on("saveDraft", function (event) {

      if (event.type === "saveDraft") {

        $("#status").text("Draft saved (type: " + event.type + ")");

      }

    });

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

      $("#editor").trigger("saveDraft");

    });

  </script>

</body>

</html>

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jQuery event.type — custom saveDraft event (Try It)