问题
I just created a new file and copy and pasted the Bootstrap Starting Code from its official site.
But the problem is whenever I minimize the browser screen to test how this menu works in small devices, the menu toggle button does not seem to be working.
As in this image shows, when I click on the button, it does not collapse and shows the menu items, somehow:
So what's wrong with this menu?
Code:
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</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 topMenu" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
</body>
</html>
回答1:
Try this code - if you post your code then I can see what your doing. Do you definitely have the class="navigation-toggle" and data-toggle="collapse" and data-target="#navigation-id" (which links to your nav menu - this needs to be done to sync the two up.
Use the CDN
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<header class="navigation navbar" role="navigation">
<div class="container-fluid">
<div class="row">
<header class="navigation navbar" role="navigation">
<div class="container-fluid">
<div class="row">
<div class="col-sm-4">
<img class="navbar-brand contini-logo" src="contini-logo.jpg">
</div>
<nav class="col-sm-8">
<div class="row">
<div class="col-sm-12">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="contini-navigation">
<span class="sr-only">Toggle Navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div> <!--Navbar header end - wierd since it is a wrapper -->
<div class="collapse navbar-collapse" id="contini-navigation">
<ul class="nav navbar-nav" id="main-menu">
<li><a>Home</a></li>
<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown">Our Restaurants<span class="caret"></span></a>
<ul class="dropdown-menu">
<li>Contini George Street</li>
<li>Canonball Restaurant & Bar</li>
<li>The Scottish Cafe</li>
</ul>
</li>
<li><a>About</a></li>
<li><a>Events</a></li>
<li><a>What's On</a></li>
<li><a>News</a></li>
<li><a>Gifts</a></li>
</ul>
</div> <!-- id contini navigation -->
</div> <!-- col-sm-12 -->
</div> <!-- row -->
<!-- <div class="row"> ===== DON"T Understand what they have done on the original site here =====
<div class="col-sm-12">
</div>
</div> -->
</nav>
</div> <!-- row -->
</div> <!-- container -->
</header>
来源：https://stackoverflow.com/questions/49629159/bootstrap-navbar-toggle-button-does-not-work