Bootstrap 4下拉菜单不起作用？

小编典典

Bootstrap 4下拉菜单不起作用？

html

我复制了下拉菜单的官方Bootstrap 4示例，但它不起作用，没有任何内容被下拉。

<li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
    <div class="dropdown-menu" aria-labelledby="dropdown01">
    <a class="dropdown-item" href="#">Action</a>
    <a class="dropdown-item" href="#">Another action</a>
    <a class="dropdown-item" href="#">Something else here</a>
  </div>
</li>

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2020-05-10

共1个答案

小编典典

编辑：万一其他人遇到这个问题，我相信OP的解决方案是他没有导入popper.js。

检查jQuery和所有相关的Bootstrap组件是否存在。还要检查控制台，并确保没有错误。

<!DOCTYPE html>

<html lang="en">

<head>

  <!-- Required meta tags -->

  <meta charset="utf-8">

  <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-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">

</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="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">

      <span class="navbar-toggler-icon"></span>

    </button>

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

      <ul class="navbar-nav">

        <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="#">Features</a>

        </li>

        <li class="nav-item">

          <a class="nav-link" href="#">Pricing</a>

        </li>

        <li class="nav-item dropdown">

          <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">

        Dropdown link

        </a>

        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">

          <a class="dropdown-item" href="#">Action</a>

          <a class="dropdown-item" href="#">Another action</a>

          <a class="dropdown-item" href="#">Something else here</a>

        </div>

        </li>

      </ul>

    </div>

  </nav>



  <!-- 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/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>

  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>

</body>

</html>

2020-05-10