Bootstrap 4：下拉菜单将在屏幕右侧显示

Question

我似乎无法将下拉项目移到页面上。我尝试了BS3的一些东西，但它们似乎不起作用。我不确定是不是因为ml-auto。 （忽略if-else语句）

继承人 http://codepen.io/bbennett36/pen/oByzgw

<div class="container-fluid">
        <nav class="navbar fixed-top navbar-toggleable-md navbar-inverse" style="background-color: #3c763d!important;">

            <button class="navbar-toggler navbar-toggler-right navbar-toggler-custom" type="button" data-toggle="collapse" data-target="#searchNav" aria-controls="searchav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>

    </button>

            <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>



    </button>

            <!-- <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button> -->

            <div id="logo">
                <a class="navbar-brand" href="/">Company</a>
            </div>

            <div class="collapse navbar-collapse" id="searchNav">
                <ul class="navbar-nav mx-auto">

                    <form action="/search" class="form-inline">
                        <input class="form-control mr-sm-2" id="keyword" name="keyword" :value='keyword' type="text" placeholder="Search for jobs" />
                        <!-- <div class="input-group"> -->

                        <input class="form-control mr-sm-2" id="location" name="location" :value='location' type="text" placeholder="Location" />
                        <!-- <button class="btn btn-secondary" type="button">Find Jobs</button> -->
                        <!-- </span> -->
                        <!-- </div> -->

                        <button class="btn btn-secondary my-2 my-sm-0" type="submit">Find Jobs</button>
                    </form>

                </ul>
            </div>
            <div class="collapse navbar-collapse" id="navbarNav">

                <ul class="navbar-nav ml-auto">
                    <li class="nav-item"><a href="/post" class="nav-link"><strong>Post Job</strong></a></li>

                    <div class="hidden-lg-up">

                    <li v-if="!user_logged" class="nav-item">
                        <a v-if="!user_logged" href="/signup" class="nav-link"><strong>Register</strong></a>
                    </li>

                    <li v-if="user_logged && user_type === 'user'" class="nav-item">
                        <a v-if="user_logged && user_type === 'user'" href="/profile" class="nav-link"><strong>Profile</strong></a>
                    </li>

                    <li v-if="user_logged && user_type === 'user'" class="nav-item">
                      <a v-if="user_logged && user_type === 'user'" href="/applied" class="nav-link"><strong>My Jobs</strong></a>
                    </li>

                    <li v-if="user_logged && user_type === 'user'" class="nav-item">
                      <a v-if="user_logged && user_type === 'user'" href="/searches" class="nav-link"><strong>My Searches</strong></a>
                    </li>

                    <li v-if="user_logged && user_type === 'company'" class="nav-item">
                        <a v-if="user_logged && user_type === 'company'" href="/dashboard" class="nav-link"><strong>Employer Dashboard</strong></a>
                    </li>

                    <li v-if="!user_logged" class="nav-item">
                        <a v-if="!user_logged" href="/login" class="nav-link"><strong>Login</strong></a>
                    </li>

                    <li v-if="user_logged" class="nav-item">
                        <a v-if="user_logged" href="/logout" class="nav-link"><strong>Logout</strong></a>
                    </li>
                  </div>

                    <div class="hidden-md-down">
                        <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="/" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                                <strong>Account</strong>
                            </a>
                            <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">

                                <!-- <li v-if="!user_logged" class="nav-item"> -->
                                <a v-if="!user_logged" href="/signup" class="dropdown-item"><strong>Register</strong></a>
                                <!-- </li> -->

                                <!-- <li v-if="user_logged && user_type === 'user'" class="nav-item"> -->
                                <a v-if="user_logged && user_type === 'user'" href="/profile" class="dropdown-item"><strong>Profile</strong></a>
                                <a v-if="user_logged && user_type === 'user'" href="/applied" class="dropdown-item"><strong>My Jobs</strong></a>
                                <a v-if="user_logged && user_type === 'user'" href="/searches" class="dropdown-item"><strong>My Searches</strong></a>

                                <!-- </li> -->

                                <!-- <li v-if="user_logged && user_type === 'company'" class="nav-item"> -->
                                <a v-if="user_logged && user_type === 'company'" href="/dashboard" class="dropdown-item"><strong>Employer Dashboard</strong></a>
                                <!-- </li> -->

                                <!-- <li v-if="!user_logged" class="nav-item"> -->
                                <a v-if="!user_logged" href="/login" class="dropdown-item"><strong>Login</strong></a>
                                <!-- </li> -->

                                <!-- <li v-if="user_logged" class="nav-item"> -->
                                <a v-if="user_logged" href="/logout" class="dropdown-item">
                                  <div class="dropdown-divider"></div>
                                  <strong>Logout</strong>
                                </a>
                                <!-- </li> -->
                            </div>

                        </li>
                    </div>

                </ul>
            </div>
        </nav>



    </div>

Answer 1

Bootstrap已内置此功能：请参阅Menu Alignment。只需将dropdown-menu-right类添加到dropdown-menu div。

即可

<div class="dropdown-menu dropdown-menu-right">

工作示例：

.navbar {
  background-color: #3c763d;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet" />

<div class="container-fluid">
  <nav class="navbar fixed-top navbar-toggleable-md navbar-inverse">

    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div id="logo">
      <a class="navbar-brand" href="#">Company</a>
    </div>

    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav mr-auto hidden-md-down">
        <form action="#" class="form-inline">
          <input class="form-control" id="keyword" name="keyword" :value='keyword' type="text" placeholder="Search for jobs" />
          <input class="form-control" id="location" name="location" :value='location' type="text" placeholder="Location" />
          <button class="btn btn-secondary" type="submit">Find Jobs</button>
        </form>
      </ul>

      <ul class="navbar-nav ml-auto">
        <li class="nav-item"><a href="#" class="nav-link"><strong>Post Job</strong></a>
        </li>

        <div class="hidden-lg-up">
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>Register</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>Profile</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>My Jobs</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>My Searches</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>Employer Dashboard</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>Login</strong></a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link"><strong>Logout</strong></a>
          </li>
        </div>

        <li class="nav-item dropdown hidden-md-down">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <strong>Account</strong>
          </a>
          <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdownMenuLink">
            <a class="dropdown-item"><strong>Register</strong></a>
            <a href="#" class="dropdown-item"><strong>Profile</strong></a>
            <a href="#" class="dropdown-item"><strong>My Jobs</strong></a>
            <a href="#" class="dropdown-item"><strong>My Searches</strong></a>
            <a href="#" class="dropdown-item"><strong>Employer Dashboard</strong></a>
            <a href="#" class="dropdown-item"><strong>Login</strong></a>
            <a href="#" class="dropdown-item">
              <div class="dropdown-divider"></div>
              <strong>Logout</strong>
            </a>
          </div>
        </li>

      </ul>
    </div>

  </nav>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>

Answer 2

在您的样式表中，.dropdown-menu将left: 0;更改为right: 0;。

Answer 3

为了使那些在谷歌搜索时偶然发现此问题但正在使用反应的人受益，公认的答案（虽然正确）不会为您解决问题。当您手动将其添加到className时，React会忽略“ dropdown-menu-right”。相反，将您的代码更新到下面，即可正确设置相同的类。

对于javascript

<DropdownMenu right>

对于打字稿

<DropdownMenu right={true}>

将其放入此处是因为在我搜索该问题时出现了该线程，花了我相当长的时间才能找出反应（reactstrap）中引导程序4的正确解决方案。

Answer 4

在 Bootstrap 5（测试版 2）中，您可以使用 dropdown-menu-end：

<div class="dropdown-menu dropdown-menu-end">
  ...
</div>

Answer 5

我正在查看您的代码，我认为已接受的答案解决了另一个问题。如果菜单移动到页面的左侧或右侧而不是按钮的下方，那是因为您缺少父类.btn-group，并且好像您的.dropdown-toggle和.dropdown-menu类的元素错误。这是Bootstrap 4文档中最基本的示例。

<div class="btn-group">
  <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Right-aligned menu
  </button>
  <div class="dropdown-menu dropdown-menu-right">
    <button class="dropdown-item" type="button">Action</button>
    <button class="dropdown-item" type="button">Another action</button>
    <button class="dropdown-item" type="button">Something else here</button>
  </div>
</div>

我只浏览了一小段代码，但是在大屏幕上出现下拉菜单时，我专注于此。

 <li class="nav-item dropdown"> <!--- change this line --->
            <a class="nav-link dropdown-toggle" href="/" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              <strong>Account</strong>
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">

              <!-- <li v-if="!user_logged" class="nav-item"> -->
              <a v-if="!user_logged" href="/signup" class="dropdown-item"><strong>Register</strong></a>
              <!-- </li> -->

              <!-- <li v-if="user_logged && user_type === 'user'" class="nav-item"> -->
              <a v-if="user_logged && user_type === 'user'" href="/profile" class="dropdown-item"><strong>Profile</strong></a>
              <a v-if="user_logged && user_type === 'user'" href="/applied" class="dropdown-item"><strong>My Jobs</strong></a>
              <a v-if="user_logged && user_type === 'user'" href="/searches" class="dropdown-item"><strong>My Searches</strong></a>

              <!-- </li> -->

              <!-- <li v-if="user_logged && user_type === 'company'" class="nav-item"> -->
              <a v-if="user_logged && user_type === 'company'" href="/dashboard" class="dropdown-item"><strong>Employer Dashboard</strong></a>
              <!-- </li> -->

              <!-- <li v-if="!user_logged" class="nav-item"> -->
              <a v-if="!user_logged" href="/login" class="dropdown-item"><strong>Login</strong></a>
              <!-- </li> -->

              <!-- <li v-if="user_logged" class="nav-item"> -->
              <a v-if="user_logged" href="/logout" class="dropdown-item">
                <div class="dropdown-divider"></div>
                <strong>Logout</strong>
              </a>
              <!-- </li> -->
            </div>

          </li>

到

 <li class="nav-item btn-group">
            <a class="nav-link dropdown-toggle" href="/" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              <strong>Account</strong>
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">

              <!-- <li v-if="!user_logged" class="nav-item"> -->
              <a v-if="!user_logged" href="/signup" class="dropdown-item"><strong>Register</strong></a>
              <!-- </li> -->

              <!-- <li v-if="user_logged && user_type === 'user'" class="nav-item"> -->
              <a v-if="user_logged && user_type === 'user'" href="/profile" class="dropdown-item"><strong>Profile</strong></a>
              <a v-if="user_logged && user_type === 'user'" href="/applied" class="dropdown-item"><strong>My Jobs</strong></a>
              <a v-if="user_logged && user_type === 'user'" href="/searches" class="dropdown-item"><strong>My Searches</strong></a>

              <!-- </li> -->

              <!-- <li v-if="user_logged && user_type === 'company'" class="nav-item"> -->
              <a v-if="user_logged && user_type === 'company'" href="/dashboard" class="dropdown-item"><strong>Employer Dashboard</strong></a>
              <!-- </li> -->

              <!-- <li v-if="!user_logged" class="nav-item"> -->
              <a v-if="!user_logged" href="/login" class="dropdown-item"><strong>Login</strong></a>
              <!-- </li> -->

              <!-- <li v-if="user_logged" class="nav-item"> -->
              <a v-if="user_logged" href="/logout" class="dropdown-item">
                <div class="dropdown-divider"></div>
                <strong>Logout</strong>
              </a>
              <!-- </li> -->
            </div>

          </li>