Bootstrap4导航栏切换无法正常工作

乌萨尔·阿尔塔斯

我有一些关于切换导航栏按钮的问题。它没有正确切换。当我按下按钮时，立即切换背景显示和消失。这是我的代码和Fiddle文件：

<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark sticky-top bg-custom">
    <div class="container-fluid">
        <a class="navbar-brand" href="#">Brand</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
            aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse text-center" id="navbarSupportedContent">
            <ul class="navbar-nav navbar-center">
                <li class="nav-item active">
                    <a class="nav-link" href="#top-img">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#games-tag">Games</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#team-tag">Team</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About Us</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

.bg-gray{
    background-color: #b8b8b8;
}

.bg-custom{
    background-color: #170c37;
}

.navbar-brand{
    font-family: roboto-thin;
    font-weight: bold;
    font-size: 28px;
}

.navbar-dark .navbar-nav .nav-link{
    font-family: roboto-thin;
    font-weight: 700;
    font-size: 16px;
}

.navbar-dark .navbar-nav .nav-item{
    margin: 0 15px;
}

.navbar-center{
    position: absolute; 
    left: 50%; 
    transform: translatex(-50%)
}

我认为绝对位置是造成问题的原因，但是如果没有它，我将无法正确居中放置物品。感谢您的帮助。

Yogendra Chauhan

如果从中删除CSS，.navbar-center则它将按预期运行，并且不会对菜单项的对齐产生任何影响，默认情况下，它们位于对齐的中心。

要么

只需添加min-height: 160px;课程.collapse.show，它将起作用。

这是工作示例：

.collapse.show {
    min-height: 160px;
}

.bg-gray{
    background-color: #b8b8b8;
}

.bg-custom{
    background-color: #170c37;
}

.navbar-brand{
    font-family: roboto-thin;
    font-weight: bold;
    font-size: 28px;
}

.navbar-dark .navbar-nav .nav-link{
    font-family: roboto-thin;
    font-weight: 700;
    font-size: 16px;
}

.navbar-dark .navbar-nav .nav-item{
    margin: 0 15px;
}

.navbar-center{
    position: absolute; 
    left: 50%; 
    transform: translatex(-50%)
}

<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>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark sticky-top bg-custom">
    <div class="container-fluid">
        <a class="navbar-brand" href="#">Brand</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
            aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse text-center" id="navbarSupportedContent">
            <ul class="navbar-nav navbar-center">
                <li class="nav-item active">
                    <a class="nav-link" href="#top-img">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#games-tag">Games</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#team-tag">Team</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About Us</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

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