Twitter bootstrap 在引导4中，使导航右侧的下拉菜单（语言选择器）始终可见

我正试图在汉堡按钮前放置一个下拉列表。挑战在于，即使导航栏崩溃，也要让它保持在同一位置。 即使我把它放在折叠导航栏折叠div之外，它也总是与其他导航元素一起折叠。 有比“绝对”更好的解决方案吗

<nav class="navbar navbar-expand-lg navbar-light fixed-top" id="navbar">
    <a class="navbar-brand" href="#">
        <img src="#" alt="" id="logo">
    </a>

    <button class="navbar-toggler hamburger hamburger--slider" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"  id="toggleNav">
<span class="hamburger-box">
<span class="hamburger-inner" ></span>
</span>
    </button> 
    <div class="language-picker">
        <ul class="navbar-nav ml-auto">
                  <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="index.html" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Language
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                    <a class="dropdown-item" href="#">English</a>
                    <a class="dropdown-item" href="#">French</a>
                    <!-- <div class="dropdown-divider"></div>
              <a class="dropdown-item" href="#">THE BEST SOLUTION</a> -->
            </div>
            </li>
        </ul>
    </div>

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mx-auto">
            <li class="nav-item">
                <a class="nav-link" href="#"><span>CONTACT</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#"><span>LOGIN</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link chatIcon" href="#"><img src="img/icons/account_icon.png" alt="a chat icon"></a>
            </li>
        </ul>
        </div>
        <!-- end collapse navbar-collapse -->
</nav>

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将下拉列表和切换程序包装在一个分区中

另一个选项是在下拉列表中使用ml auto，并将其从导航栏nav中删除：

<nav class="navbar navbar-expand-lg navbar-light fixed-top" id="navbar">
    <a class="navbar-brand" href="#">
        <img src="//placehold.it/30" alt="" id="logo">
    </a>
    <div class="d-flex flex-row">
        <div class="language-picker">
            <ul class="navbar-nav ml-auto">
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle mr-2" href="index.html" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Language
                </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" href="#">English</a>
                        <a class="dropdown-item" href="#">French</a>
                        <!-- <div class="dropdown-divider"></div>
              <a class="dropdown-item" href="#">THE BEST SOLUTION</a> -->
                    </div>
                </li>
            </ul>
        </div>
        <button class="navbar-toggler hamburger hamburger--slider" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" id="toggleNav">
            <span class="hamburger-box navbar-toggler-icon">
            <span class="hamburger-inner"></span>
            </span>
        </button>
    </div>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mx-auto">
            <li class="nav-item">
                <a class="nav-link" href="#"><span>CONTACT</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#"><span>LOGIN</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link chatIcon" href="#"><img src="//placehold.it/30" alt="a chat icon"></a>
            </li>
        </ul>
    </div>
    <!-- end collapse navbar-collapse -->
</nav>