HTML Code

<!DOCTYPE html>



<html lang=en>



<head>



  <meta charset=UTF-8>



  <meta name=viewport content="width=device-width,initial-scale=1">



  <title>onbeforeprint — addEventListener</title>



  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #1d4ed8;background:#2563eb;color:#fff}.log{margin-top:1rem;padding:.75rem 1rem;background:#fef9c3;border:1px solid #fde047;border-radius:8px;font-size:.8125rem;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>



</head>



<body>



  <h1>window.addEventListener("beforeprint")</h1>



  <p>Preferred modern pattern — the <code>beforeprint</code> event targets the <code>window</code>.</p>



  <button type=button id=printBtn>Print this page</button>



  <div class=log id=log>Listener ready. Open the print dialog to trigger beforeprint.</div>





  <script>window.addEventListener("beforeprint",(function(){document.getElementById("log").innerHTML="<strong>beforeprint event:</strong> dialog opening. You can also use <code>window.onbeforeprint</code>."})),document.getElementById("printBtn").addEventListener("click",(function(){window.print()}))</script>



</body>



</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

HTML onbeforeprint Attribute — addEventListener