使用用户配置文件下拉列表引导 4-beta.3 导航栏

Question

我正在努力拥有一个带有搜索表单和"配置文件"下拉菜单的标准 Bootstrap 4 顶部导航栏。唯一的问题是配置文件下拉列表应该一直正确，发生的情况是下拉项从屏幕向右滚动。我只需要一些右边距设置即可将其拉入还是我的导航栏类属性中缺少某些内容？

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <button class="navbar-toggler" type="button" data-toggle="collapse"
            data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" 
            aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">
        <img src="http://www.bobmazzo.com/wp-content/uploads/2009/07/bobmazzoCD.jpg" width="30" height="30" >
    </a>
    <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
        <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Patients</a>
            </li>
            <li class="nav-item">
                <a class="nav-link disabled" href="#">Reports</a>
            </li>
            
        </ul>
        <form id="searchForm" class="form-inline my-2 my-lg-0">
            <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
        <ul class="navbar-nav ">
            <!-- PROFILE DROPDOWN - scrolling off the page to the right -->
            <li class="nav-item dropdown">
                <a href="#" class="nav-link dropdown-toggle" id="navDropDownLink" 
                    data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Profile
                </a>
                <div class="dropdown-menu" aria-labelledby="navDropDownLink">
                    <a class="dropdown-item" href="#">Preferences</a>
                    <div class="dropdown-divider"></div>
                    <a class="dropdown-item" href="#">Logout</a>
                </div>
            </li>
        </ul>
               
    </div>
    
</nav>

扑克：https://plnkr.co/edit/VM1VEbVcTmadljARolaq?p=preview

Answer 1

Bootstrap 有 JavaScript 和 jQuery 依赖项，你没有在那里加载。这就是原因。

尝试加载这些：

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

主要问题是你没有使用container。

试试这个代码：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <div class="container">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
</button>
        <a class="navbar-brand" href="#">
    <img src="http://www.bobmazzo.com/wp-content/uploads/2009/07/bobmazzoCD.jpg" width="30" height="30" >
</a>
        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
            <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Patients</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" href="#">Reports</a>
                </li>
            </ul>
            <form id="searchForm" class="form-inline my-2 my-lg-0">
                <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
                <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
            </form>
            <ul class="navbar-nav ">
                <!-- PROFILE DROPDOWN - scrolling off the page to the right -->
                <li class="nav-item dropdown">
                    <a href="#" class="nav-link dropdown-toggle" id="navDropDownLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                Profile
            </a>
                    <div class="dropdown-menu" aria-labelledby="navDropDownLink">
                        <a class="dropdown-item" href="#">Preferences</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">Logout</a>
                    </div>
                </li>
            </ul>
        </div>
    </div>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

容器对于导航栏不是绝对必要的，但它确实有助于防止他的本质问题，以及防止导航栏在宽 4K 屏幕上一直跨越

Answer 2

将下拉菜单的对齐方式更改为右侧对我有用。将 Boostrap 类.dropdown-menu-right添加到下拉菜单中。在下拉菜单中查看菜单对齐方式