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                <main class="container mt-5 mb-5" lang="ja">

<h1 class="mb-3">設定</h1>

<div class="bg-primary-subtle border border-light-subtle" id="messagebox" aria-live="polite">
<p class="mb-0 p-3" id="message"></p>

<form class="mt-5" id="myForm" >

<label class="form-label fs-5" for="inputField">設定項目1</label>
<input type="text" class="form-control border-dark rounded-0" id="inputField">

<fieldset class="mt-4">
<legend class="fs-5">設定項目2</legend>
<div class="form-check">
<input type="checkbox" class="form-check-input border-dark" id="checkBox1">
<label class="form-check-label" for="checkBox1">機能 A を有効にする</label>
<div class="form-check"> 
<input type="checkbox" class="form-check-input border-dark" id="checkBox2">
<label class="form-check-label" for="checkBox2">機能 B を有効にする</label>

<fieldset class="mt-4">
<legend class="fs-5">設定項目3</legend>
<div class="form-check">
<input type="radio" class="form-check-input border-dark" id="radiobutton1" name="radioGroup" value="option1">
<label class="form-check-label" for="radiobutton1">オプションその1</label>
<div class="form-check">
<input type="radio" class="form-check-input border-dark" id="radiobutton2" name="radioGroup" value="option2">
<label class="form-check-label" for="radiobutton2">オプションその2</label>

<button type="submit" class="btn btn-primary rounded-0 mt-5" id="submitButton">保存</button>



                /* JS が有効の場合にのみ、(サブミットボタンの無効化に伴って) メッセージボックスを表示させたいので、いったん display:none; にする。 */


                const form = document.getElementById("myForm");
const formControls = form.querySelectorAll("input, textarea, select");
const submitButton = document.getElementById("submitButton");
const message = document.getElementById("message");
const messagebox = document.getElementById("messagebox");

// メッセージボックスのデフォルト設定 ="block";
message.textContent = "設定を変更すると、ページ末尾の「保存」ボタンが有効になります。";

// サブミットボタンをデフォルトで disabled にする。
submitButton.setAttribute("disabled", "disabled");

// 各フォーム入力要素の初期設定
document.getElementById("inputField").value = "hogehoge" ;
document.getElementById("checkBox1").checked = "true" ;
document.getElementById("checkBox2").checked = "true" ;
document.getElementById("radiobutton1").checked = "true" ;

// コントロールの変更を監視
formControls.forEach(control => {
  control.addEventListener("input", updateSubmitButtonState);
  control.addEventListener("change", updateSubmitButtonState);

// いずれかのコントロールの値が変更された場合、submitButtonを有効化
function updateSubmitButtonState() {
  let anyValueChanged = false;
  formControls.forEach(control => {
    if (control.type !== "radio" || control.checked) {
      if (control.type === "checkbox" || control.type === "radio") {
        if (control.checked !== control.defaultChecked) {
          anyValueChanged = true;
      } else if (control.value !== control.defaultValue) {
        anyValueChanged = true;

  if (anyValueChanged) {
    submitButton.removeAttribute("disabled"); //サブミットボタンを有効化
    message.textContent = "設定が変更されました。設定内容を保存するには、ページ末尾の「保存」ボタンを押してください。";
    messagebox.classList.add("bg-danger-subtle"); //メッセージボックスの背景色を差し替え

// フォームの送信時のダミー処理
form.addEventListener("submit", function(event) {
  event.preventDefault(); // フォームの実際の送信を防ぐ
  submitButton.setAttribute("disabled", "disabled"); //サブミットボタンを無効化
  message.textContent = "設定が保存されました。";
  messagebox.classList.add("bg-success-subtle"); //メッセージボックスの背景色を差し替え