bootstrap4.css
button:not(:disabled),
[type="button"]:not(:disabled),
[type="reset"]:not(:disabled),
[type="submit"]:not(:disabled) {
  cursor: pointer;
}
bootstrap4.css
.form-control:disabled, .form-control[readonly] {
  background-color: #e9ecef;
  opacity: 1;
}
bootstrap4.css
.form-check-input:disabled ~ .form-check-label {
  color: #6c757d;
}
bootstrap4.css
.btn.disabled, .btn:disabled {
  opacity: 0.65;
}
bootstrap4.css
a.btn.disabled,
fieldset:disabled a.btn {
  pointer-events: none;
}
bootstrap4.css
.btn-primary.disabled, .btn-primary:disabled {
  color: #fff;
  background-color: #007bff;
  border-color: #007bff;
}
bootstrap4.css
.btn-primary:not(:disabled):not(.disabled):active, .btn-primary:not(:disabled):not(.disabled).active,
.show > .btn-primary.dropdown-toggle {
  color: #fff;
  background-color: #0062cc;
  border-color: #005cbf;
}
bootstrap4.css
.btn-primary:not(:disabled):not(.disabled):active:focus, .btn-primary:not(:disabled):not(.disabled).active:focus,
.show > .btn-primary.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(38, 143, 255, 0.5);
}
bootstrap4.css
.btn-secondary.disabled, .btn-secondary:disabled {
  color: #fff;
  background-color: #6c757d;
  border-color: #6c757d;
}
bootstrap4.css
.btn-secondary:not(:disabled):not(.disabled):active, .btn-secondary:not(:disabled):not(.disabled).active,
.show > .btn-secondary.dropdown-toggle {
  color: #fff;
  background-color: #545b62;
  border-color: #4e555b;
}
bootstrap4.css
.btn-secondary:not(:disabled):not(.disabled):active:focus, .btn-secondary:not(:disabled):not(.disabled).active:focus,
.show > .btn-secondary.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(130, 138, 145, 0.5);
}
bootstrap4.css
.btn-success.disabled, .btn-success:disabled {
  color: #fff;
  background-color: #28a745;
  border-color: #28a745;
}
bootstrap4.css
.btn-success:not(:disabled):not(.disabled):active, .btn-success:not(:disabled):not(.disabled).active,
.show > .btn-success.dropdown-toggle {
  color: #fff;
  background-color: #1e7e34;
  border-color: #1c7430;
}
bootstrap4.css
.btn-success:not(:disabled):not(.disabled):active:focus, .btn-success:not(:disabled):not(.disabled).active:focus,
.show > .btn-success.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(72, 180, 97, 0.5);
}
bootstrap4.css
.btn-info.disabled, .btn-info:disabled {
  color: #fff;
  background-color: #17a2b8;
  border-color: #17a2b8;
}
bootstrap4.css
.btn-info:not(:disabled):not(.disabled):active, .btn-info:not(:disabled):not(.disabled).active,
.show > .btn-info.dropdown-toggle {
  color: #fff;
  background-color: #117a8b;
  border-color: #10707f;
}
bootstrap4.css
.btn-info:not(:disabled):not(.disabled):active:focus, .btn-info:not(:disabled):not(.disabled).active:focus,
.show > .btn-info.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(58, 176, 195, 0.5);
}
bootstrap4.css
.btn-warning.disabled, .btn-warning:disabled {
  color: #212529;
  background-color: #ffc107;
  border-color: #ffc107;
}
bootstrap4.css
.btn-warning:not(:disabled):not(.disabled):active, .btn-warning:not(:disabled):not(.disabled).active,
.show > .btn-warning.dropdown-toggle {
  color: #212529;
  background-color: #d39e00;
  border-color: #c69500;
}
bootstrap4.css
.btn-warning:not(:disabled):not(.disabled):active:focus, .btn-warning:not(:disabled):not(.disabled).active:focus,
.show > .btn-warning.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(222, 170, 12, 0.5);
}
bootstrap4.css
.btn-danger.disabled, .btn-danger:disabled {
  color: #fff;
  background-color: #dc3545;
  border-color: #dc3545;
}
bootstrap4.css
.btn-danger:not(:disabled):not(.disabled):active, .btn-danger:not(:disabled):not(.disabled).active,
.show > .btn-danger.dropdown-toggle {
  color: #fff;
  background-color: #bd2130;
  border-color: #b21f2d;
}
bootstrap4.css
.btn-danger:not(:disabled):not(.disabled):active:focus, .btn-danger:not(:disabled):not(.disabled).active:focus,
.show > .btn-danger.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(225, 83, 97, 0.5);
}
bootstrap4.css
.btn-light.disabled, .btn-light:disabled {
  color: #212529;
  background-color: #f8f9fa;
  border-color: #f8f9fa;
}
bootstrap4.css
.btn-light:not(:disabled):not(.disabled):active, .btn-light:not(:disabled):not(.disabled).active,
.show > .btn-light.dropdown-toggle {
  color: #212529;
  background-color: #dae0e5;
  border-color: #d3d9df;
}
bootstrap4.css
.btn-light:not(:disabled):not(.disabled):active:focus, .btn-light:not(:disabled):not(.disabled).active:focus,
.show > .btn-light.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(216, 217, 219, 0.5);
}
bootstrap4.css
.btn-dark.disabled, .btn-dark:disabled {
  color: #fff;
  background-color: #343a40;
  border-color: #343a40;
}
bootstrap4.css
.btn-dark:not(:disabled):not(.disabled):active, .btn-dark:not(:disabled):not(.disabled).active,
.show > .btn-dark.dropdown-toggle {
  color: #fff;
  background-color: #1d2124;
  border-color: #171a1d;
}
bootstrap4.css
.btn-dark:not(:disabled):not(.disabled):active:focus, .btn-dark:not(:disabled):not(.disabled).active:focus,
.show > .btn-dark.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(82, 88, 93, 0.5);
}
bootstrap4.css
.btn-outline-primary.disabled, .btn-outline-primary:disabled {
  color: #007bff;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-primary:not(:disabled):not(.disabled):active, .btn-outline-primary:not(:disabled):not(.disabled).active,
.show > .btn-outline-primary.dropdown-toggle {
  color: #fff;
  background-color: #007bff;
  border-color: #007bff;
}
bootstrap4.css
.btn-outline-primary:not(:disabled):not(.disabled):active:focus, .btn-outline-primary:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-primary.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.btn-outline-secondary.disabled, .btn-outline-secondary:disabled {
  color: #6c757d;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-secondary:not(:disabled):not(.disabled):active, .btn-outline-secondary:not(:disabled):not(.disabled).active,
.show > .btn-outline-secondary.dropdown-toggle {
  color: #fff;
  background-color: #6c757d;
  border-color: #6c757d;
}
bootstrap4.css
.btn-outline-secondary:not(:disabled):not(.disabled):active:focus, .btn-outline-secondary:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-secondary.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
}
bootstrap4.css
.btn-outline-success.disabled, .btn-outline-success:disabled {
  color: #28a745;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-success:not(:disabled):not(.disabled):active, .btn-outline-success:not(:disabled):not(.disabled).active,
.show > .btn-outline-success.dropdown-toggle {
  color: #fff;
  background-color: #28a745;
  border-color: #28a745;
}
bootstrap4.css
.btn-outline-success:not(:disabled):not(.disabled):active:focus, .btn-outline-success:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-success.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
}
bootstrap4.css
.btn-outline-info.disabled, .btn-outline-info:disabled {
  color: #17a2b8;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-info:not(:disabled):not(.disabled):active, .btn-outline-info:not(:disabled):not(.disabled).active,
.show > .btn-outline-info.dropdown-toggle {
  color: #fff;
  background-color: #17a2b8;
  border-color: #17a2b8;
}
bootstrap4.css
.btn-outline-info:not(:disabled):not(.disabled):active:focus, .btn-outline-info:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-info.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
}
bootstrap4.css
.btn-outline-warning.disabled, .btn-outline-warning:disabled {
  color: #ffc107;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-warning:not(:disabled):not(.disabled):active, .btn-outline-warning:not(:disabled):not(.disabled).active,
.show > .btn-outline-warning.dropdown-toggle {
  color: #212529;
  background-color: #ffc107;
  border-color: #ffc107;
}
bootstrap4.css
.btn-outline-warning:not(:disabled):not(.disabled):active:focus, .btn-outline-warning:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-warning.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
}
bootstrap4.css
.btn-outline-danger.disabled, .btn-outline-danger:disabled {
  color: #dc3545;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-danger:not(:disabled):not(.disabled):active, .btn-outline-danger:not(:disabled):not(.disabled).active,
.show > .btn-outline-danger.dropdown-toggle {
  color: #fff;
  background-color: #dc3545;
  border-color: #dc3545;
}
bootstrap4.css
.btn-outline-danger:not(:disabled):not(.disabled):active:focus, .btn-outline-danger:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-danger.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
}
bootstrap4.css
.btn-outline-light.disabled, .btn-outline-light:disabled {
  color: #f8f9fa;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-light:not(:disabled):not(.disabled):active, .btn-outline-light:not(:disabled):not(.disabled).active,
.show > .btn-outline-light.dropdown-toggle {
  color: #212529;
  background-color: #f8f9fa;
  border-color: #f8f9fa;
}
bootstrap4.css
.btn-outline-light:not(:disabled):not(.disabled):active:focus, .btn-outline-light:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-light.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(248, 249, 250, 0.5);
}
bootstrap4.css
.btn-outline-dark.disabled, .btn-outline-dark:disabled {
  color: #343a40;
  background-color: transparent;
}
bootstrap4.css
.btn-outline-dark:not(:disabled):not(.disabled):active, .btn-outline-dark:not(:disabled):not(.disabled).active,
.show > .btn-outline-dark.dropdown-toggle {
  color: #fff;
  background-color: #343a40;
  border-color: #343a40;
}
bootstrap4.css
.btn-outline-dark:not(:disabled):not(.disabled):active:focus, .btn-outline-dark:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-dark.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
}
bootstrap4.css
.btn-link:disabled, .btn-link.disabled {
  color: #6c757d;
  pointer-events: none;
}
bootstrap4.css
.dropdown-item.disabled, .dropdown-item:disabled {
  color: #6c757d;
  pointer-events: none;
  background-color: transparent;
}
bootstrap4.css
.custom-control-input:not(:disabled):active ~ .custom-control-label::before {
  color: #fff;
  background-color: #b3d7ff;
  border-color: #b3d7ff;
}
bootstrap4.css
.custom-control-input:disabled ~ .custom-control-label {
  color: #6c757d;
}
bootstrap4.css
.custom-control-input:disabled ~ .custom-control-label::before {
  background-color: #e9ecef;
}
bootstrap4.css
.custom-checkbox .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-checkbox .custom-control-input:disabled:indeterminate ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-radio .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-switch .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-select:disabled {
  color: #6c757d;
  background-color: #e9ecef;
}
bootstrap4.css
.custom-file-input:disabled ~ .custom-file-label {
  background-color: #e9ecef;
}
bootstrap4.css
.custom-range:disabled::-webkit-slider-thumb {
  background-color: #adb5bd;
}
bootstrap4.css
.custom-range:disabled::-webkit-slider-runnable-track {
  cursor: default;
}
bootstrap4.css
.custom-range:disabled::-moz-range-thumb {
  background-color: #adb5bd;
}
bootstrap4.css
.custom-range:disabled::-moz-range-track {
  cursor: default;
}
bootstrap4.css
.custom-range:disabled::-ms-thumb {
  background-color: #adb5bd;
}
bootstrap4.css
.nav-link.disabled {
  color: #6c757d;
  pointer-events: none;
  cursor: default;
}
bootstrap4.css
.nav-tabs .nav-link.disabled {
  color: #6c757d;
  background-color: transparent;
  border-color: transparent;
}
bootstrap4.css
.navbar-light .navbar-nav .nav-link.disabled {
  color: rgba(0, 0, 0, 0.3);
}
bootstrap4.css
.navbar-dark .navbar-nav .nav-link.disabled {
  color: rgba(255, 255, 255, 0.25);
}
bootstrap4.css
.page-item.disabled .page-link {
  color: #6c757d;
  pointer-events: none;
  cursor: auto;
  background-color: #fff;
  border-color: #dee2e6;
}
bootstrap4.css
.list-group-item.disabled, .list-group-item:disabled {
  color: #6c757d;
  pointer-events: none;
  background-color: #fff;
}
bootstrap4.css
.close:not(:disabled):not(.disabled):hover, .close:not(:disabled):not(.disabled):focus {
  opacity: .75;
}
bootstrap4.css
a.close.disabled {
  pointer-events: none;
}
■リストグループ:list-group:コンポーネント:リスト項目を無効状態にする

  • リスト項目1
  • リスト項目2
  • リスト項目3
  <section class="w-50 m-auto">
      <ul class="list-group">
    <li class="list-group-item disabled">リスト項目1</li>
    <li class="list-group-item">リスト項目2</li>
    <li class="list-group-item">リスト項目3</li>
  </ul>
</section>
■リストグループ:list-group:コンポーネント:aタグ リストグループ

  <section class="w-50 m-auto">
      <div class="list-group">
    <a href="#" class="list-group-item list-group-item-action">リスト項目1</a>
    <a href="#" class="list-group-item list-group-item-action">リスト項目2</a>
    <a href="#" class="list-group-item list-group-item-action disabled">リスト項目3</a>
  </div>
</section>
■リストグループ:list-group:コンポーネント:リストグループ aタグ

  <section class="w-50 m-auto">
      <div class="list-group">
    <a href="#" class="list-group-item list-group-item-action">リスト項目1</a>
    <a href="#" class="list-group-item list-group-item-action">リスト項目2</a>
    <a href="#" class="list-group-item list-group-item-action disabled">リスト項目3</a>
  </div>
</section>
■リストグループ:list-group:コンポーネント:ボタンのリストグループ button

  <section class="w-50 m-auto my-5">
    <div class="list-group">
      <button type="button" class="list-group-item list-group-item-action">リスト項目1</button>
      <button type="button" class="list-group-item list-group-item-action">リスト項目2</button>
      <button type="button" class="list-group-item list-group-item-action" disabled>リスト項目3</button>
    </div>
  </section>
■ページネーション:pagination:コンポーネント:ページネーションの配置 中央寄せ(justify-content-center)

    <nav aria-label="ページネーションの例">
      <ul class="pagination justify-content-center">
        <li class="page-item disabled"><a class="page-link" href="#" tabindex="-1">前</a></li>
        <li class="page-item"><a class="page-link" href="#">1</a></li>
        <li class="page-item"><a class="page-link" href="#">2</a></li>
        <li class="page-item"><a class="page-link" href="#">3</a></li>
        <li class="page-item"><a class="page-link" href="#">次</a></li>
      </ul>
    </nav>
■ページネーション:pagination:コンポーネント:ページネーションの配置 右寄せ(justify-content-end)

    <nav aria-label="Page navigation example">
      <ul class="pagination justify-content-end">
        <li class="page-item disabled"><a class="page-link" href="#" tabindex="-1">前</a>        </li>
        <li class="page-item"><a class="page-link" href="#">1</a></li>
        <li class="page-item"><a class="page-link" href="#">2</a></li>
        <li class="page-item"><a class="page-link" href="#">3</a></li>
        <li class="page-item"><a class="page-link" href="#">次</a></li>
      </ul>
    </nav>
■ページネーション:pagination:コンポーネント:リンクの無効状態やアクティブ状態を指定する

  <nav aria-label="ページネーションの例">
    <ul class="pagination">
      <li class="page-item disabled"><a class="page-link" href="#" tabindex="-1">前</a></li>
      <li class="page-item"><a class="page-link" href="#">1</a></li>
      <li class="page-item active"><a class="page-link" href="#">2 <span class="sr-only">(現ページ)</span></a></li>
      <li class="page-item"><a class="page-link" href="#">3</a></li>
      <li class="page-item"><a class="page-link" href="#">次</a></li>
    </ul>
  </nav>
■ページネーション:pagination:コンポーネント:ページネーションのサイズ pagination-lg

  <nav aria-label="ページネーションの例">
    <ul class="pagination pagination-lg">
      <li class="page-item disabled"><a class="page-link" href="#" tabindex="-1">前</a></li>
      <li class="page-item"><a class="page-link" href="#">1</a></li>
      <li class="page-item"><a class="page-link" href="#">2</a></li>
      <li class="page-item"><a class="page-link" href="#">3</a></li>
      <li class="page-item"><a class="page-link" href="#">次</a></li>
    </ul>
  </nav>
■ページネーション:pagination:コンポーネント:ページネーションのサイズ pagination-sm

  <nav aria-label="ページネーションの例">
    <ul class="pagination pagination-sm">
      <li class="page-item disabled"><a class="page-link" href="#" tabindex="-1">次</a></li>
      <li class="page-item"><a class="page-link" href="#">1</a></li>
      <li class="page-item"><a class="page-link" href="#">2</a></li>
      <li class="page-item"><a class="page-link" href="#">3</a></li>
      <li class="page-item"><a class="page-link" href="#">前</a></li>
    </ul>
  </nav>
■ページネーション:pagination:コンポーネント:span要素でリンクの無効状態やアクティブ状態を指定する

<nav aria-label="ページネーションの例">
  <ul class="pagination">
    <li class="page-item disabled"><span class="page-link">前</span></li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active"><span class="page-link">2<span class="sr-only">(現ページ)</span></span></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item"><a class="page-link" href="#">次</a></li>
  </ul>
</nav>
<script>
  $(function() {
    $('.disabled > a.page-link').click(function() {
      return false;
    });
  });
</script>
■ドロップダウン:dropdown-menu:コンポーネント:メニュー項目に無効やアクティブの状態を設定する

  <!-- ボタングループ -->
  <div class="btn-group">
    <!-- 切り替えボタン -->
    <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">ドロップダウン</button>
    <!-- ドロップダウンメニュー -->
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#">メニュー01</a>
      <a class="dropdown-item disabled" href="#">メニュー02(無効)</a>
      <a class="dropdown-item active" href="#">メニュー03(アクティブ)</a>
    </div>
  </div>
■フォーム:form-group:コンポーネント:カスタムフォームのチェックボックスとラジオボタンを無効にする

  <form>
    <!-- チェックボックスを無効にする -->
    <div class="custom-control custom-checkbox">
      <input type="checkbox" class="custom-control-input" id="checkbox11" disabled>
      <label class="custom-control-label" for="checkbox11">
        チェック(無効)
      </label>
    </div>
    <!-- ラジオボタンを無効にする -->
    <div class="custom-control custom-radio">
      <input type="radio" name="radioDisabled" id="checkbox12" class="custom-control-input" disabled>
      <label class="custom-control-label" for="checkbox12">
        オプション(無効)
      </label>
    </div>
  </form>
■フォーム:form-group:コンポーネント:一連の入力グループをまとめて無効にする

  <form>
    <fieldset disabled>
      <div class="form-group">
        <label for="disabledTextInput">無効な入力欄</label>
        <input type="text" id="disabledTextInput" class="form-control" placeholder="Disabled input"> </div>
      <div class="form-group">
        <label for="disabledSelect">無効なプルダウンメニュー</label>
        <select id="disabledSelect" class="form-control">
          <option>Disabled select</option>
        </select>
      </div>
      <div class="form-check">
        <input class="form-check-input" type="checkbox" id="disabledCheck" disabled>
        <label class="form-check-label" for="disabledCheck">無効なチェックボックス</label>
      </div>
      <button type="submit" class="btn btn-primary">無効な送信ボタン</button>
    </fieldset>
  </form>
■フォーム:form-group:コンポーネント:水平配置のフォームを作成する

ラジオボタン
チェックボックス
  <form>
    <div class="form-group row">
      <label for="inputEmail" class="col-sm-2 col-form-label">メールアドレス</label>
      <div class="col-sm-10">
        <input type="email" class="form-control" id="inputEmail" placeholder="メールアドレスを入力">
      </div>
    </div>
    <div class="form-group row">
      <label for="inputPassword" class="col-sm-2 col-form-label">パスワード</label>
      <div class="col-sm-10">
        <input type="password" class="form-control" id="inputPassword" placeholder="パスワードを入力">
      </div>
    </div>
    <fieldset class="form-group">
      <div class="row">
        <legend class="col-form-label col-sm-2 pt-0">ラジオボタン</legend>
        <div class="col-sm-10">
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios1" value="option1" checked>
            <label class="form-check-label" for="radios1">
              オプション1
            </label>
          </div>
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios2" value="option2">
            <label class="form-check-label" for="radios2">
              オプション2
            </label>
          </div>
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios3" value="option3" disabled>
            <label class="form-check-label" for="radios3">
              オプション3(無効)
            </label>
          </div>
        </div>
      </div>
    </fieldset>
    <div class="form-group row">
      <div class="col-sm-2">チェックボックス</div>
      <div class="col-sm-10">
        <div class="form-check">
          <input class="form-check-input" type="checkbox" id="check1">
          <label class="form-check-label" for="check1">
            チェックする
          </label>
        </div>
      </div>
    </div>
    <div class="form-group row">
      <div class="col-sm-10">
        <button type="submit" class="btn btn-primary">サインイン</button>
      </div>
    </div>
  </form>
■ボタン:button:コンポーネント:無効状態のボタンを作成する a要素で role=button

  <a href="#" class="btn btn-primary btn-lg disabled" role="button" aria-disabled="true">無効ボタン</a>
  <a href="#" class="btn btn-primary btn-lg" role="button">通常ボタン</a>
■ボタン:button:コンポーネント:無効状態のボタンを作成する disabled

  <button class="btn btn-lg btn-primary" disabled>無効ボタン</button>
  <button class="btn btn-lg btn-primary">通常ボタン</button>
■ナビゲーションバー:navbar:コンポーネント:ナビゲーション:div要素を使用したナビゲーション

  <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <a class="navbar-brand" href="#">ブランド</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="ナビゲーション切替">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <div class="navbar-nav">
        <a class="nav-item nav-link active" href="#">リンク1<span class="sr-only">(現位置)</span></a>
        <a class="nav-item nav-link" href="#">リンク2</a>
        <a class="nav-item nav-link" href="#">リンク3</a>
        <a class="nav-item nav-link disabled" href="#">無効</a>
      </div>
    </div>
  </nav>
■ナビゲーションバー:navbar:コンポーネント:ナビゲーション:ul要素を使用したナビゲーション

  <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <a class="navbar-brand" href="#">ブランド</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="ナビゲーション切替">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav">
        <li class="nav-item active"><a class="nav-link" href="#">リンク1<span class="sr-only">(現位置)</span></a></li>
        <li class="nav-item"><a class="nav-link" href="#">リンク2</a></li>
        <li class="nav-item"><a class="nav-link" href="#">リンク3</a></li>
        <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
      </ul>
    </div>
  </nav>
■ナビゲーションバー:navbar:コンポーネント:ナビゲ―ション項目の幅を調整 nav要素を使用したナビゲーション

    <nav class="nav nav-pills nav-fill">
    <a class="nav-item nav-link active" href="#">アクティブ</a>
    <a class="nav-item nav-link" href="#">リンク</a>
    <a class="nav-item nav-link disabled" href="#">無効</a>
  </nav>
■ナビゲーションバー:navbar:コンポーネント:ナビゲ―ション項目の幅を調整 nav-fillクラスが無い時

  <ul class="nav nav-pills">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーションバー:navbar:コンポーネント:ナビゲ―ション項目の幅を調整 nav-fillクラスを追加した時

    <ul class="nav nav-pills nav-fill">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーションバー:navbar:コンポーネント:flexユーティリティを利用したレスポンシブなナビゲーション

  <nav class="nav nav-pills flex-column flex-sm-row">
    <a class="flex-sm-fill text-sm-center nav-link active" href="#">アクティブ</a>
    <a class="flex-sm-fill text-sm-center nav-link" href="#">リンク</a>
    <a class="flex-sm-fill text-sm-center nav-link disabled" href="#">無効</a>
  </nav>
■ナビゲーションバー:navbar:コンポーネント:ピル型ナビゲーション

  <ul class="nav nav-pills">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーションバー:navbar:コンポーネント:ドロップダウンを組み込んだピル型ナビゲーション

  <ul class="nav nav-pills">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">ドロップダウン</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">リンク1</a>
        <a class="dropdown-item" href="#">リンク2</a>
        <a class="dropdown-item" href="#">リンク3</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">その他リンク</a>
      </div>
    </li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーションバー:navbar:コンポーネント:タブ型ナビゲーション

  <ul class="nav nav-tabs">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーションバー:navbar:コンポーネント:ドロップダウンを組み込んだタブ型ナビゲーション

  <ul class="nav nav-tabs">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">ドロップダウン</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">リンク1</a>
        <a class="dropdown-item" href="#">リンク2</a>
        <a class="dropdown-item" href="#">リンク3</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">その他リンク</a>
      </div>
    </li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
  
■ナビゲーション水平方向、均等:nav:コンポーネント:ナビゲーション:水平方向

    <ul class="nav">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーション水平方向、均等:nav:コンポーネント:ナビゲーション:中央寄せ

    <ul class="nav justify-content-center"><!-- 中央寄せ -->
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーション水平方向、均等:nav:コンポーネント:ナビゲーション:右寄せ

    <ul class="nav justify-content-end">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーション水平方向、均等:nav:コンポーネント:ナビゲーションを垂直(縦)に並べる:ul要素

    <ul class="nav flex-column">
    <li class="nav-item"><a class="nav-link active" href="#">アクティブ</a></li>
    <li class="nav-item"><a class="nav-link" href="#">リンク</a></li>
    <li class="nav-item"><a class="nav-link disabled" href="#">無効</a></li>
  </ul>
■ナビゲーション水平方向、均等:nav:コンポーネント:ナビゲーションを縦に並べる:nav要素、li使わないaのみ

    <nav class="nav flex-column">
    <a class="nav-link active" href="#">アクティブ</a>
    <a class="nav-link" href="#">リンク</a>
    <a class="nav-link disabled" href="#">無効</a>
  </nav>