HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>focusout migration</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 420px; }

    label { display: block; margin-bottom: 6px; font-weight: 600; }

    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 14px; }

    #legacy { border-color: #f59e0b; }

    #modern { border-color: #10b981; }

    #out { padding: 10px; background: #f8fafc; border-radius: 6px; color: #334155; min-height: 1.2em; }

  </style>

</head>

<body>

  <label for="legacy">Legacy field (.focusout)</label>

  <input type="text" id="legacy" placeholder="Focus then tab away">

  <label for="modern">Modern field (.on focusout)</label>

  <input type="text" id="modern" placeholder="Focus then tab away">

  <div id="out">Tab out of either field.</div>

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

  <script>

    $("#legacy").focusout(function() {

      $("#out").text("Legacy: .focusout(function(){ ... }) — deprecated since jQuery 3.3.");

    });

    $("#modern").on("focusout", function() {

      $("#out").text("Modern: .on('focusout', function(){ ... }) — use this for new code.");

    });

  </script>

</body>

</html>

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jQuery .focusout(fn) vs .on('focusout', fn) — migration (Try It)