目前，我正在使用Bootstrap 3和Mega Menu建立一个网站。除了一个不愉快的时刻，一切都很好-我的超级菜单定位错误。它没有在memmove内部打开，而是忽略了容器并在容器外部打开。您可以全屏打开该代码段，并看到它在容器外部打开。我摔断了头，但我仍然不明白问题出在哪里。
memmove.container
答案 0 :(得分：1)
您必须相对于导航栏（或容器，取决于要实现的大型菜单的宽度）添加位置
.navbar-collapse {
position: relative;
}
.navbar-nav>li>.dropdown-menu {
margin-top: 20px;
border-top-left-radius: 4px;
border-top-right-radius: 4px;
}
.mega-dropdown {
position: static !important;
}
.mega-dropdown-menu {
padding: 20px 0px;
width: 100%;
box-shadow: none;
-webkit-box-shadow: none;
max-width: 1300px;
margin: 0 auto;
}
.mega-dropdown-menu:before {
content: "";
border-bottom: 15px solid #fff;
border-right: 17px solid transparent;
border-left: 17px solid transparent;
position: absolute;
top: -15px;
left: 285px;
z-index: 10;
}
.mega-dropdown-menu:after {
content: "";
border-bottom: 17px solid #ccc;
border-right: 19px solid transparent;
border-left: 19px solid transparent;
position: absolute;
top: -17px;
left: 283px;
z-index: 8;
}
.mega-dropdown-menu > li > ul {
padding: 0;
margin: 0;
}
.mega-dropdown-menu > li > ul > li {
list-style: none;
}
.mega-dropdown-menu > li > ul > li > a {
display: block;
padding: 3px 20px;
clear: both;
font-weight: normal;
line-height: 1.428571429;
color: #999;
white-space: normal;
}
.mega-dropdown-menu > li ul > li > a:hover,
.mega-dropdown-menu > li ul > li > a:focus {
text-decoration: none;
color: #444;
background-color: #f5f5f5;
}
.mega-dropdown-menu .dropdown-header {
color: #428bca;
font-size: 18px;
font-weight: bold;
}
.mega-dropdown-menu form {
margin: 3px 20px;
}
.mega-dropdown-menu .form-group {
margin-bottom: 3px;
}
.navbar-collapse {
position: relative;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="container">
<nav class="navbar navbar-inverse navbar-fixed-top sticky-navbar">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse" data-target="#myNavbar">
<i class="fa fa-bars" aria-hidden="true"></i>
</button>
</div>
<div class="collapse navbar-collapse" id="navMain">
<ul class="nav navbar-nav pull-right custom-pull">
<li><a href="about.html">Home</a></li>
<li><a href="about.html">About</a></li>
<li><a href="attorneys.html">Attorneys</a></li>
<li><a href="practice-areas.html">Practice Areas</a></li>
<li><a href="contact.html">Contact Us</a></li>
<li class="dropdown mega-dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Collection <i class="fa fa-angle-down" aria-hidden="true"></i>
</a>
<ul class="dropdown-menu mega-dropdown-menu row">
<li class="col-sm-3">
<ul>
<li class="dropdown-header">New in Stores</li>
<div id="myCarousel" class="carousel slide" data-ride="carousel">
<div class="carousel-inner">
<div class="item active">
<a href="#"><img src="http://placehold.it/254x150/3498db/f5f5f5/&text=New+Collection" class="img-responsive" alt="product 1"></a>
<h4><small>Summer dress floral prints</small></h4>
<button class="btn btn-primary" type="button">49,99 €</button>
<button href="#" class="btn btn-default" type="button"><span class="glyphicon glyphicon-heart"></span> Add to Wishlist</button>
</div>
<!-- End Item -->
<div class="item">
<a href="#"><img src="http://placehold.it/254x150/ef5e55/f5f5f5/&text=New+Collection" class="img-responsive" alt="product 2"></a>
<h4><small>Gold sandals with shiny touch</small></h4>
<button class="btn btn-primary" type="button">9,99 €</button>
<button href="#" class="btn btn-default" type="button"><span class="glyphicon glyphicon-heart"></span> Add to Wishlist</button>
</div>
<!-- End Item -->
<div class="item">
<a href="#"><img src="http://placehold.it/254x150/2ecc71/f5f5f5/&text=New+Collection" class="img-responsive" alt="product 3"></a>
<h4><small>Denin jacket stamped</small></h4>
<button class="btn btn-primary" type="button">49,99 €</button>
<button href="#" class="btn btn-default" type="button"><span class="glyphicon glyphicon-heart"></span> Add to Wishlist</button>
</div>
<!-- End Item -->
</div>
<!-- End Carousel Inner -->
</div>
<!-- /.carousel -->
<li class="divider"></li>
<li><a href="#">View all Collection <span class="glyphicon glyphicon-chevron-right pull-right"></span></a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Dresses</li>
<li><a href="#">Unique Features</a></li>
<li><a href="#">Image Responsive</a></li>
<li><a href="#">Auto Carousel</a></li>
<li><a href="#">Newsletter Form</a></li>
<li><a href="#">Four columns</a></li>
<li class="divider"></li>
<li class="dropdown-header">Tops</li>
<li><a href="#">Good Typography</a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Jackets</li>
<li><a href="#">Easy to customize</a></li>
<li><a href="#">Glyphicons</a></li>
<li><a href="#">Pull Right Elements</a></li>
<li class="divider"></li>
<li class="dropdown-header">Pants</li>
<li><a href="#">Coloured Headers</a></li>
<li><a href="#">Primary Buttons & Default</a></li>
<li><a href="#">Calls to action</a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Accessories</li>
<li><a href="#">Default Navbar</a></li>
<li><a href="#">Lovely Fonts</a></li>
<li><a href="#">Responsive Dropdown </a></li>
<li class="divider"></li>
<li class="dropdown-header">Newsletter</li>
<form class="form" role="form">
<div class="form-group">
<label class="sr-only" for="email">Email address</label>
<input type="email" class="form-control" id="email" placeholder="Enter email">
</div>
<button type="submit" class="btn btn-primary btn-block">Sign in</button>
</form>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
</div>