Bootstrap 4-beta.3 带有用户配置文件下拉菜单的导航栏

Question

我正在努力打造一个标准的 Bootstrap 4 顶部导航栏，带有搜索表单和 "profile" 下拉菜单。唯一的问题是配置文件下拉菜单应该一直都是正确的，而发生的事情是下拉菜单项从屏幕向右滚动。我是否只需要一些 margin-right 设置来拉入它，或者我是否在我的导航栏 class 属性中遗漏了一些东西？

<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>

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

Answer 1

Bootstrap 有 JavaScript 和 jQuery 依赖项，您没有在那里加载它们。就是这个原因。

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>

主要问题是您没有使用 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其性质的问题以及防止您的导航栏一直跨越宽 4K 屏幕。

Answer 2

将下拉菜单的对齐方式更改为右对齐对我有用。添加 Boostrap class .dropdown-menu-right 到下拉菜单。查看 menu alignment in dropdowns

Bootstrap 4-beta.3 带有用户配置文件下拉菜单的导航栏

Bootstrap 4-beta.3 navbar with User Profile dropdown

navbar

bootstrap-4

angular5