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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>onchange — select dropdown</title>



  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7;transition:background .2s}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;font-weight:600;margin-bottom:.35rem}select{padding:.5rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px;min-width:160px}.status{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>



</head>



<body>



  <h1>onchange on select</h1>



  <p>For <code>&lt;select&gt;</code>, change fires immediately when the user picks a new option.</p>



  <label for=color>Theme color</label>



  <select id=color onchange=changeColor()>



    <option value="">Choose…</option>



    <option value=#fef2f2>Red tint</option>



    <option value=#f0fdf4>Green tint</option>



    <option value=#eff6ff>Blue tint</option>



  </select>



  <div class=status id=status>Pick a color to update the page background.</div>





  <script>function changeColor(){var e=document.getElementById("color").value;document.body.style.backgroundColor=e||"#f8fafc",document.getElementById("status").textContent=e?"change event: background updated to "+e:"Choose a color from the list."}</script>



</body>



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HTML onchange Attribute — Select Dropdown