Bootstrap 4:下拉菜单将在屏幕右侧显示

Question

我似乎无法让下拉项目离开页面.我尝试了BS3的一些东西,但它们似乎没有用.我不确定它是不是因为ml-auto.(忽略if-else语句)

下面是编码器
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:请参阅菜单对齐.只需将该dropdown-menu-right类添加到dropdown-menudiv即可.

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

工作实例:

.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 Bootstrap 5（beta 2）中，您可以使用dropdown-menu-end：

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

Answer 3

为了那些在谷歌搜索时偶然发现这个问题但正在使用反应的人的利益，接受的答案（虽然正确）不会为你解决问题。当您手动将其添加到 className 时，React 会忽略 'dropdown-menu-right'。相反，将您的代码更新为下面的代码，它会正确设置相同的类。

对于 JavaScript

<DropdownMenu right>

对于打字稿

<DropdownMenu right={true}>

把它放在这里，因为当我在谷歌搜索这个问题时出现了这个线程，我花了很长时间才找出反应（reactstrap）中引导程序 4 的正确解决方案。

Answer 4

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