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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>method — dynamic JS</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:320px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.btns{margin-top:.75rem;display:flex;gap:.5rem;flex-wrap:wrap}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}button.is-active{background:#2563eb;color:#fff;border-color:#1d4ed8}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>form.method in JavaScript</h1>

  <form id=dynamicForm action=/api>

    <label for=topic>Topic:</label>

    <input id=topic name=topic value=HTML>

  </form>

  <div class=btns>

    <button type=button id=setGet class=is-active>Set method to GET</button>

    <button type=button id=setPost>Set method to POST</button>

  </div>

  <p class=status id=status>Current form.method: <code>get</code></p>



  <script>var form=document.getElementById("dynamicForm"),status=document.getElementById("status"),btnGet=document.getElementById("setGet"),btnPost=document.getElementById("setPost");function updateUI(t){form.method=t,status.innerHTML="Current form.method: <code>"+t+"</code>",btnGet.classList.toggle("is-active","get"===t),btnPost.classList.toggle("is-active","post"===t)}btnGet.addEventListener("click",(function(){updateUI("get")})),btnPost.addEventListener("click",(function(){updateUI("post")}))</script>

</body>

</html>

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HTML method Attribute — Dynamic form.method with JavaScript