HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>change migration</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    select { 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 select (.change)</label>
  <select id="legacy">
    <option>A</option>
    <option>B</option>
  </select>
  <label for="modern">Modern select (.on change)</label>
  <select id="modern">
    <option>A</option>
    <option>B</option>
  </select>
  <div id="out">Change either select.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#legacy").change(function() {
      $("#out").text("Legacy: .change(function(){ ... }) — deprecated since jQuery 3.3.");
    });
    $("#modern").on("change", function() {
      $("#out").text("Modern: .on('change', function(){ ... }) — use this for new code.");
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

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