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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onsubmit — 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}form{max-width:420px;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.25rem;font-weight:600;font-size:.875rem}input[type=email]{width:100%;padding:.5rem .75rem;margin-bottom:.75rem;border:1px solid #cbd5e1;border-radius:6px;box-sizing:border-box}button[type=submit]{padding:.5rem 1rem;border:none;border-radius:6px;background:#2563eb;color:#fff;font-weight:600;cursor:pointer}#status{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>Submit without reload</h1>

  <p>Production-style handler with <code>addEventListener</code>.</p>



  <form id=subscribeForm action=/subscribe method=post>

    <label for=email>Email</label>

    <input type=email id=email name=email required placeholder=you@example.com>

    <button type=submit>Subscribe</button>

  </form>

  <p id=status aria-live=polite>Enter an email and submit.</p>



  <script>var form=document.getElementById("subscribeForm"),status=document.getElementById("status");form.addEventListener("submit",(function(t){t.preventDefault();var e=document.getElementById("email").value.trim();status.textContent="Thanks! We saved: "+e,status.style.background="#f0fdf4",status.style.borderColor="#bbf7d0",status.style.color="#166534"}))</script>

</body>

</html>

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HTML onsubmit Attribute — preventDefault with addEventListener