我制作了一个包含下拉菜单的侧边栏。如果下拉菜单打开。我想要<li class="nav-item nav-item-sidebar">
(位于整个下拉列表的顶部)具有一定的 CSS 样式。这是
border-left: 3px solid #1ABB9C;
padding: 8px 8px 8px 5px;
background-color: #222732;
我怎样才能实现这一目标?
HTML
<li class="nav-item nav-item-sidebar">
<a class="nav-link" href="#pageSubmenu" data-toggle="collapse" aria-expanded="false">
<i class="fal fa-thumbs-up fa-lg sidebar-icon"></i>
<span class="sidebar-link">Dropdown</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow rotate-effect"></span>
</a>
<ul class="collapse list-unstyled" id="pageSubmenu">
<li class="nav-item">
<a href="#Bier1" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-copy fa-lg sidebar-icon"></i>
<span class="sidebar-link">Files</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
<li class="nav-item">
<a href="#Bier2" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-comments fa-lg sidebar-icon"></i>
<span class="sidebar-link">Comments</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
<li class="nav-item">
<a href="#Bier3" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-image fa-lg sidebar-icon"></i>
<span class="sidebar-link">Pictures</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
</ul>
</li>
我猜这与a[aria-expanded="true"]
有关但我不确定。
如何实现上述目标?
最佳答案
这里,当调用下拉菜单时,折叠类将更改元素的颜色。 btnBackground 是从 jquery 调用的,它将应用 css。试试这个。
在下拉项中,效果是在加载默认 css 后发生的,但是您可以在加载下拉项时更改它,这是为了显示颜色如何从默认更改为您添加的 css。
$(".dropdown-toggle").click(function() {
$(this).toggleClass("btnBackground");
});
.btnBackground {
border-left: 3px solid #1ABB9C;
padding: 8px 8px 8px 5px;
background-color: #222732;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<li class="nav-item nav-item-sidebar dropdown-toggle">
<a class="nav-link" href="#pageSubmenu" data-toggle="collapse" aria-expanded="false">
<i class="fal fa-thumbs-up fa-lg sidebar-icon"></i>
<span class="sidebar-link">Dropdown</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow rotate-effect"></span>
</a>
<ul class="collapse list-unstyled" id="pageSubmenu">
<li class="nav-item">
<a href="#Bier1" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-copy fa-lg sidebar-icon"></i>
<span class="sidebar-link">Files</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
<li class="nav-item">
<a href="#Bier2" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-comments fa-lg sidebar-icon"></i>
<span class="sidebar-link">Comments</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
<li class="nav-item">
<a href="#Bier3" class="nav-link sidebar-dropdown-nav-link">
<i class="fal fa-image fa-lg sidebar-icon"></i>
<span class="sidebar-link">Pictures</span>
<span class="fal fa-angle-right fa-lg sidebar-arrow"></span>
</a>
</li>
</ul>
</li>
<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>
关于html - Bootstrap 4 侧边栏下拉咏叹调扩展背景颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48475692/