HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>dynamic htmlFor</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:500;color:#475569;cursor:pointer}input{width:100%;max-width:320px;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit;margin-bottom:.75rem}button{padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;font:inherit;cursor:pointer}.status{margin-top:1rem;font-size:.8125rem;color:#64748b}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>Dynamic htmlFor</h1>
  <label id=dynamicLabel for=fieldA>Field A:</label>
  <input id=fieldA placeholder="First field">
  <input id=fieldB placeholder="Second field">
  <button type=button id=switchBtn>Point label at Field B</button>
  <p class=status id=status>Label targets <code>fieldA</code>. Click the label to focus that input.</p>

  <script>var label=document.getElementById("dynamicLabel"),btn=document.getElementById("switchBtn"),status=document.getElementById("status"),pointingAtB=!1;btn.addEventListener("click",(function(){pointingAtB=!pointingAtB,label.htmlFor=pointingAtB?"fieldB":"fieldA",btn.textContent=pointingAtB?"Point label at Field A":"Point label at Field B",status.innerHTML="Label now targets <code>"+label.htmlFor+"</code>."}))</script>
</body>
</html>

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HTML for Attribute — Dynamic htmlFor with JavaScript