Question

我尝试使用引导程序导航栏并编写以下代码：

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container-fluid">
            <a class="navbar-brand" href="#">Navbar</a>
            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarGeneral" aria-controls="navbarGeneral" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse" id="navbarGeneral">
                
    <ul class="nav navbar-nav">
                <li class="nav-item ">
                        <a href="http://localhost:8080/" class="nav-link">Home 
                        </a>
                    
                </li>
                <li class="nav-item active">
                        <a href="http://localhost:8080/bootstrap5" class="nav-link">bootstrap5 
                        </a>
                    
                </li>
                <li class="nav-item">
                        <a href="http://localhost:8080/home4" class="nav-link">home4 
                        </a>
                    
                </li>
                <li class="nav-item  dropdown">
                        <a href="http://localhost:8080/LoginPage" class="nav-link dropdown-toggle" data-bs-toggle="dropdown" role="button" aria-expanded="false">LoginPage 
                        </a>
                        <ul class="dropdown-menu">
                <li class="nav-item  ">
                        <a href="http://localhost:8080/LoginPage/Bootstrap-34" class="dropdown-item">Bootstrap 3.4 
                        </a>
                    
                </li>
        </ul>

                </li>
        </ul>


            </div>
        </div>
    </nav>

点击登录页面时出现错误

<块引用>

未捕获的 DOMException：无法执行 'querySelector' “文档”：“http://localhost:8080/LoginPage”不是有效的选择器。

什么问题？

Jsfiddle

Answer 1

使用它并让我知道它是否有效

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js?cdv=40" type="text/javascript"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css?cdv=40" type="text/css" rel="stylesheet"/>
</head>
<body>
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container-fluid">
            <a class="navbar-brand" href="#">Navbar</a>
            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarGeneral" aria-controls="navbarGeneral" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse" id="navbarGeneral">
                
    <ul class="nav navbar-nav">
                <li class="nav-item ">
                        <a href="http://localhost:8080/" class="nav-link">Home 
                        </a>
                    
                </li>
                <li class="nav-item active">
                        <a href="http://localhost:8080/bootstrap5" class="nav-link">bootstrap5 
                        </a>
                    
                </li>
                <li class="nav-item">
                        <a href="http://localhost:8080/home4" class="nav-link">home4 
                        </a>
                    
                </li>
                <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            LoginPage
          </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li><hr class="dropdown-divider"></li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
          </ul>
        </li>
        </ul>


            </div>
        </div>
    </nav>
</body>
</html>

Answer 2

无法切换下拉菜单，因为锚标记正在尝试导航。从 href 中删除 url...

       <li class="nav-item dropdown">
                <a href="#" class="nav-link dropdown-toggle" 
                    data-bs-toggle="dropdown" 
                    role="button" aria-expanded="false">LoginPage</a>
                <ul class="dropdown-menu">
                    <li class="nav-item ">
                        <a href="http://localhost:8080/LoginPage/Bootstrap-34" class="dropdown-item">Bootstrap 3.4 </a>
                    </li>
                </ul>
       </li>

为什么下拉菜单在 bootstrap5 导航栏中不起作用？

2 个答案: