【发布时间】：2018-12-27 19:52:33
【问题描述】：
我有一个奇怪的问题，我的 Bootstrap4 导航栏折叠在窄模式下展开菜单时没有堆叠导航项。我认为这与搜索输入的配置与全宽导航项有关。为了让搜索输入堆叠到左侧和导航链接堆叠到右侧，我将它们放入两个单独的 ul 中，并将带有 justify-content-between 的 flex-row 应用到父 div。这给了我想要的全宽外观，但完全破坏了折叠菜单中的堆叠。
以下是 chrome 中折叠和展开结果的图像。
这是完整的代码，因为它只是我在玩 Bootstrap4
nav{
-webkit-box-shadow: 0px 6px 15px 0px rgba(0,0,0,0.5);
-moz-box-shadow: 0px 6px 15px 0px rgba(0,0,0,0.5);
box-shadow: 0px 6px 15px 0px rgba(0,0,0,0.5);
}<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" integrity="sha384-Smlep5jCw/wG7hdkwQ/Z5nLIefveQRIY9nfy6xoR1uRYBtpZgI6339F5dgvm/e9B" crossorigin="anonymous">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.1.1/css/all.css" integrity="sha384-O8whS3fhG2OnA5Kas0Y9l3cfpmYjapjI0E4theH4iuMD+pLhbf6JI0jIMfYcK3yZ" crossorigin="anonymous">
<link rel="stylesheet" href="../C4 Boiler/css/nav.css">
<title>Boiler Plate</title>
</head>
<body>
<nav class="navbar sticky-top navbar-expand-md navbar-dark bg-dark">
<a class="navbar-brand" href="#">
<img src="https://picsum.photos/50" width="50" height="50" alt="Test">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-between" id="navbarNavDropdown">
<ul class="navbar-nav flex-row">
<form class="form-inline mr-auto">
<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">
<i class="fas fa-search fa-lg"></i>
</button>
</form>
</ul>
<ul class="navbar-nav flex-row-reverse">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Profile
</a>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Info
</a>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
</ul>
</div>
</nav>
<div class="title-box container">
<div>
</div>
</div>
<div class="project-box container">
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js" integrity="sha384-o+RDsa0aLu++PJvFqy8fFScvbHFLtbvScb8AjopnFD+iEQ7wo/CG0xlczd+2O/em" crossorigin="anonymous"></script>
</body>
</html>如果有人有任何建议，我将不胜感激。
谢谢 马特
【问题讨论】：
标签： html responsive-design bootstrap-4 navbar