我创建了一个 Angular 5 应用程序,并通过 index.html 包含 Bootstrap 4。我制作了一个基本的导航栏组件,并尝试将其包含在我的应用程序中。但是在响应模式下,我看不到切换器,它显示为白色,但在检查时我可以看到它以及单击它还会显示菜单。为什么它没有正确显示?
我正在使用一个简单的导航栏,如下所示:
<nav class="navbar navbar-expand-lg shift">
<a class="navbar-brand" href="#">
<img src="logo.png" alt="Brand Logo" />
</a>
<button class="navbar-toggler navbar-toggler-right" 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" id="navbarNavDropdown">
<ul class="nav nav-pills ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Exams</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
这是我的小提琴:jsfiddle
导航元素(导航栏灯(中缺少颜色主题:
<nav class="navbar navbar-expand-lg shift navbar-light">
在这里摆弄
在响应模式下,切换器图标不显示,因为此图标类具有某些依赖项。如果您像这样更改代码,则将显示:
<nav class="navbar navbar-light">
导航栏-切换器-图标类具有父类。 因此,您应该添加父类导航栏-浅色、导航栏-深色
试试这个:我只是添加了bar和一点点css样式
<nav class="navbar navbar-expand-lg shift">
<a class="navbar-brand" href="#">
<img src="logo.png" alt="Brand Logo" />
</a>
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon">
<div class="bar1"></div>
<div class="bar1"></div>
<div class="bar1"></div>
</span>
</button>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="nav nav-pills ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Exams</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
CSS 样式
/* NAVIGATION */
nav ul li {
display: inline-block;
}
nav ul li a {
display: block;
padding: 15px;
text-decoration: none;
color: #343b40;
font-weight: 800;
text-transform: uppercase;
margin: 0 10px;
}
nav ul li a,
nav ul li a:after,
nav ul li a:before {
transition: all .5s;
}
nav ul li a:hover {
color: white;
}
/* SHIFT */
nav.shift ul li a {
position:relative;
z-index: 1;
}
nav.shift ul li a:hover {
color: white;
}
nav.shift ul li a:after {
display: block;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
width: 100%;
height: 1px;
content: '.';
color: transparent;
background: #34caf7;
visibility: none;
opacity: 0;
z-index: -1;
}
nav.shift ul li a:hover:after {
opacity: 1;
visibility: visible;
height: 100%;
}
.navbar-toggler-right{
background-color:red;
}
.navbar-toggler-icon{
background-color:white;
}
.bar1{
width: 30px;
height: 2px;
background-color: #000;
margin: 6px 0;
transition: 0.4s;
}
}
根据需要更改颜色和样式!看看这个!https://jsfiddle.net/t4h0w4pw/3/