Question

我是使用Bootstrap的新手，并且非常希望你们中的一位专业人士向我展示我犯错误的地方。

我想要实现的目标：我正在使用Bootstrap在响应式网站上工作。我希望我的导航栏固定在顶部，当网页缩小到移动尺寸时，我希望我的导航栏在按下时显示菜单项。

问题：在移动浏览器尺寸中，按下时导航栏不会显示任何菜单项。没有切换。

我尝试过：我浏览过其他用户的StackOverflow问题和评论，其中大多数人都说要确保＆＃34;数据切换＆＃34;匹配＆＃34;折叠导航栏崩溃后的ID选择器＆＃34;类。

你会发现这些匹配。 myNavbar是一个id选择器。解决方案不起作用。

              <div class="container-fluid" id="contentsOfMenu">

                <div class="navbar-header page-scroll">

                  <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span> 
                  </button>
                  <div class"page-scroll">
                  <a href="#welcome" id="brandLabel"><img src="images/brainFishIconMenu.png"/></a>
                  <a class="navbar-brand" href="#welcome" >BrainFish</a>
                 </div>

                </div><!--end of navbar-header--------------------------->

                <div class="collapse navbar-collapse" id="myNavbar">

                  <ul class="nav navbar-nav navbar-right" id="navLinkColor">

                    <li class="page-scroll"><a href="#aboutUs">About</a></li>
                    <li class="page-scroll"><a href="#services">Services</a></li> 
                    <li class="page-scroll"><a href="#approach">Approach</a></li> 
                    <li class="page-scroll"><a href="#contact">Contact</a></li>          
                  </ul>

                </div><!--end of myNavBar-->

              </div><!--end of contentsOfMenu--------------------->

      </nav><!--end of navigation-->

Answer 1

首先确保在jquery脚本标记之后包含了bootstrap.js。然后检查导航栏标记。例如：

<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="path/to/bootstrap.js" type="text/javascript"></script><!--required for navbar toggle-->

和

<div class="navbar navbar-inverse navbar-static-top navbar-topic">
            <div class="container">
            <div class="navbar-header"><!--navbar start-->
                <a  href="#"  class="navbar-brand"><!--Logo -->
                    your site
                </a>
                <button class="navbar-toggle" data-toggle="collapse" data-target=".navHeaderCollapse">
                    <span class="icon-bar"></span><!--4 icon-bar spans create the dropdown menu-->
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>

                </button>
            </div>
                <div class="collapse navbar-collapse navHeaderCollapse">
                    <ul class="nav navbar-nav navbar-right">

                        <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">More things <b class="caret"></b></a>
                        <ul class="dropdown-menu">
                            <li><a href="/html/webdesign/html.php">Html</a></li>
                            <li><a href="">Link</a></li>
                            <li><a href="">Link 2</a></li>
                            <li><a href="">Link 3</a></li>

                        </ul>


                        </li>
                        <li><a href="">Links</a></li>
                        <li><a href="">Contact</a></li>
                    </ul>
                </div>

Answer 2

您需要正确添加CDN，否则切换将无法正常工作

添加Bootstrap 4 CDN的顺序是：

的jQuery
Popper.js
Bootstrap JS

根据bootstrap 4规范要遵循的示例模板是：

<!DOCTYPE html>

<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Kulkarni Book-Stall</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
     <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <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>
        
    <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="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
                  <span class="navbar-toggler-icon"></span>
                </button>
              
                <div class="collapse navbar-collapse" id="navbarTogglerDemo02">
                  <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
                    <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">
                      <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">
                    <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
                  </form>
                </div>
     </nav>
</body>
</html>

Answer 3

您可能缺少bootstrap的javascript组件。菜单折叠功能需要它才能工作。或者，异常可能已停止Javascript。您可以在浏览器调试控制台中查看它。

Bootstrap导航栏不会切换

3 个答案: