HTML Code
<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>list — switch datalists</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 1rem;font-size:1.25rem;color:#0f172a}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:600}input{width:100%;max-width:280px;padding:.5rem .65rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit;box-sizing:border-box}.btns{margin-top:.75rem;display:flex;gap:.5rem;flex-wrap:wrap}button{padding:.45rem .85rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}button.is-active{background:#2563eb;color:#fff;border-color:#2563eb}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:320px}</style>

</head>

<body>

  <h1>Swap list target</h1>

  <label for=food>Pick a food</label>

  <input id=food list=fruits placeholder="Start typing…">

  <div class=btns>

    <button type=button id=btnFruits class=is-active>Fruits list</button>

    <button type=button id=btnVeg>Vegetables list</button>

  </div>

  <p class=status id=status>Current list: <strong>fruits</strong></p>



  <datalist id=fruits>

    <option value=Apple>

    </option><option value=Banana>

    </option><option value=Orange>

    </option><option value=Mango>

  </option></datalist>

  <datalist id=vegetables>

    <option value=Carrot>

    </option><option value=Broccoli>

    </option><option value=Spinach>

    </option><option value=Peas>

  </option></datalist>



  <script>var food=document.getElementById("food"),status=document.getElementById("status"),btnFruits=document.getElementById("btnFruits"),btnVeg=document.getElementById("btnVeg");btnFruits.addEventListener("click",(function(){food.setAttribute("list","fruits"),food.value="",status.innerHTML="Current list: <strong>fruits</strong>",btnFruits.classList.add("is-active"),btnVeg.classList.remove("is-active")})),btnVeg.addEventListener("click",(function(){food.setAttribute("list","vegetables"),food.value="",status.innerHTML="Current list: <strong>vegetables</strong>",btnVeg.classList.add("is-active"),btnFruits.classList.remove("is-active")}))</script>

</body>

</html>
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HTML list Attribute — Switch Datalists
