我正在尝试制作 this Bootstrap 可折叠侧边栏模板工作，但不能。它看起来应该看起来像，但在按下按钮时没有反应，即使我已经从 https://getbootstrap.com/docs/4.1/getting-started/download/ 下载了“编译的 CSS 和 Js”和 jquery 并像这样包含它:
<html>
<head>
<link rel="stylesheet" href="${pageContext.request.contextPath}/bootstrap-4.1.3/css/bootstrap.css">
<script src="${pageContext.request.contextPath}/bootstrap-4.1.3/js/bootstrap.js"></script>
<script src="${pageContext.request.contextPath}/bootstrap-4.1.3/js/jquery-3.3.1.min.js"></script>
<style>style from template</style>
<script>script from template</script>
</head>
<body>
body from template
</body>
</html>
当我点击折叠或菜单上的任何位置时，它根本没有反应，这与人们在模板中看到的正确 react 相反。
为什么会发生这种情况以及如何解决？
编辑:真实链接:https://www.codeply.com/go/3e0RAjccRO/bootstrap-4-collapsing-sidebar-menu
最佳答案
虽然您提供的链接(有问题的第 5 个词)没有指向任何入门模板。如果您正在谈论可折叠的侧边栏，如下面的屏幕截图所示:
然后它为我工作。我所做的只是为超棒的字体 css 添加了缺少的 link。请参阅下面的完整代码片段:
#sidebar .list-group-item {
border-radius: 0;
background-color: #333;
color: #ccc;
border-left: 0;
border-right: 0;
border-color: #2c2c2c;
white-space: nowrap;
}
/* highlight active menu */
#sidebar .list-group-item:not(.collapsed) {
background-color: #222;
}
/* closed state */
#sidebar .list-group .list-group-item[aria-expanded="false"]::after {
content: " \f0d7";
font-family: FontAwesome;
display: inline;
text-align: right;
padding-left: 5px;
}
/* open state */
#sidebar .list-group .list-group-item[aria-expanded="true"] {
background-color: #222;
}
#sidebar .list-group .list-group-item[aria-expanded="true"]::after {
content: " \f0da";
font-family: FontAwesome;
display: inline;
text-align: right;
padding-left: 5px;
}
/* level 1*/
#sidebar .list-group .collapse .list-group-item {
padding-left: 20px;
}
/* level 2*/
#sidebar .list-group .collapse > .collapse .list-group-item {
padding-left: 30px;
}
/* level 3*/
#sidebar .list-group .collapse > .collapse > .collapse .list-group-item {
padding-left: 40px;
}
@media (max-width:48em) {
/* overlay sub levels on small screens */
#sidebar .list-group .collapse.in, #sidebar .list-group .collapsing {
position: absolute;
z-index: 1;
width: 190px;
}
#sidebar .list-group > .list-group-item {
text-align: center;
padding: .75rem .5rem;
}
/* hide caret icons of top level when collapsed */
#sidebar .list-group > .list-group-item[aria-expanded="true"]::after,
#sidebar .list-group > .list-group-item[aria-expanded="false"]::after {
display:none;
}
}
/* change transition animation to width when entire sidebar is toggled */
#sidebar.collapse {
-webkit-transition-timing-function: ease;
-o-transition-timing-function: ease;
transition-timing-function: ease;
-webkit-transition-duration: .2s;
-o-transition-duration: .2s;
transition-duration: .2s;
}
#sidebar.collapsing {
opacity: 0.8;
width: 0;
-webkit-transition-timing-function: ease-in;
-o-transition-timing-function: ease-in;
transition-timing-function: ease-in;
-webkit-transition-property: width;
-o-transition-property: width;
transition-property: width;
}<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="container-fluid">
<div class="row">
<div class="col-md-3 col-1 pl-0 pr-0 collapse fade show" id="sidebar">
<div class="list-group panel">
<a href="#menu1" class="list-group-item collapsed" data-toggle="collapse" data-parent="#sidebar" aria-expanded="false"><i class="fa fa-dashboard fa-fw"></i> <span class="ml-1 hidden-sm-down"> Item 1</span> </a>
<div class="collapse" id="menu1">
<a href="#menu1sub1" class="list-group-item" data-toggle="collapse" aria-expanded="false">Subitem 1 </a>
<div class="collapse" id="menu1sub1">
<a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 1 a</a>
<a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 2 b</a>
<a href="#menu1sub1sub1" class="list-group-item" data-toggle="collapse" aria-expanded="false">Subitem 3 c </a>
<div class="collapse" id="menu1sub1sub1">
<a href="#" class="list-group-item" data-parent="#menu1sub1sub1">Subitem 3 c.1</a>
<a href="#" class="list-group-item" data-parent="#menu1sub1sub1">Subitem 3 c.2</a>
</div>
<a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 4 d</a>
<a href="#menu1sub1sub2" class="list-group-item" data-toggle="collapse" aria-expanded="false">Subitem 5 e </a>
<div class="collapse" id="menu1sub1sub2">
<a href="#" class="list-group-item" data-parent="#menu1sub1sub2">Subitem 5 e.1</a>
<a href="#" class="list-group-item" data-parent="#menu1sub1sub2">Subitem 5 e.2</a>
</div>
</div>
<a href="#" class="list-group-item" data-parent="#menu1">Subitem 2</a>
<a href="#" class="list-group-item" data-parent="#menu1">Subitem 3</a>
</div>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-film fa-fw"></i> <span class="ml-1 hidden-sm-down"> Item 2</span></a>
<a href="#menu3" class="list-group-item collapsed" data-toggle="collapse" data-parent="#sidebar" aria-expanded="false"><i class="fa fa-book fa-fw"></i> <span class="ml-1 hidden-sm-down"> Item 3 </span></a>
<div class="collapse" id="menu3">
<a href="#" class="list-group-item" data-parent="#menu3">3.1</a>
<a href="#menu3sub2" class="list-group-item" data-toggle="collapse" aria-expanded="false">3.2 </a>
<div class="collapse" id="menu3sub2">
<a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 a</a>
<a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 b</a>
<a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 c</a>
</div>
<a href="#" class="list-group-item" data-parent="#menu3">3.3</a>
</div>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-heart fa-fw"></i> <span class="ml-1 hidden-sm-down">Item 4</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-list fa-fw"></i> <span class="ml-1 hidden-sm-down">Item 5</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-clock-o fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-th fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-gear fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-calendar fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-envelope fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-bar-chart-o fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
<a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-star fa-fw"></i> <span class="ml-1 hidden-sm-down">Link</span></a>
</div>
</div>
<main class="col-md-9 col-11 pl-2 pt-2">
<a href="#sidebar" data-toggle="collapse" class="m-2"><i class="fa fa-navicon fa-2x text-muted"></i></a>
<div class="page-header">
<h1>Bootstrap 4 Sidebar Menu</h1>
</div>
<p class="lead">A responsive, multi-level vertical accordion.</p>
</main>
</div>
</div>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>关于javascript - Bootstrap : template example doesn't work - buttons don't react，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53032661/