如何在导航栏中下拉以在引导程序中工作答案

【问题标题】：How to get drop down in navbar to work in bootstrap如何在导航栏中下拉以在引导程序中工作
【发布时间】：2019-07-22 09:58:54
【问题描述】：

我可以让导航栏可见，但导航栏中的下拉菜单不起作用 -- 当我单击下拉菜单时，它不会显示菜单。

我从另一个 Bootstrap 网站获得了源代码。但它在我的项目中无法正常工作。

HTML：

<nav class="mb-1 navbar navbar-expand-lg navbar-dark info-color" style="background-color: #293631; height: 2cm">

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent-4"
      aria-controls="navbarSupportedContent-4" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent-4">
      <ul class="navbar-nav ml-auto">
        <li class="nav-item active">
          <a class="nav-link" href="https://www.facebook.com/madhusanka.edirimanna">
            <i class="fab fa-facebook-f"></i> Facebook
            <span class="sr-only">(current)</span>
          </a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">
            <i class="fab fa-instagram"></i> Instagram</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink-4" data-toggle="dropdown"
            aria-haspopup="true" aria-expanded="false">
            <i class="fas fa-user" ></i> Profile </a>
          <div class="dropdown-menu dropdown-menu-right dropdown-info" aria-labelledby="navbarDropdownMenuLink-4">
            <a class="dropdown-item" href="#">My account</a>
            <a class="dropdown-item" routerLink="/home">Log out</a>
          </div>
        </li>
      </ul>
    </div>
  </nav>

【问题讨论】：

标签： html bootstrap-4 angular6

【解决方案1】：

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <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>
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <button class="navbar-toggler ml-auto" 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" id="navbarSupportedContent">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item active">
          <a class="nav-link" href="https://www.facebook.com/madhusanka.edirimanna">
            <i class="fab fa-facebook-f"></i> Facebook
            <span class="sr-only">(current)</span>
          </a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">
            <i class="fab fa-instagram"></i> Instagram</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink-4" data-toggle="dropdown"
             aria-haspopup="true" aria-expanded="false">
            <i class="fas fa-user" ></i> Profile </a>
          <div class="dropdown-menu dropdown-menu-right dropdown-info" aria-labelledby="navbarDropdownMenuLink-4">
            <a class="dropdown-item" href="#">My account</a>
            <a class="dropdown-item" routerLink="/home">Log out</a>
          </div>
        </li>
      </ul>
    </div>
  </nav>
  <script
  src="https://code.jquery.com/jquery-3.4.1.min.js"
  integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
  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>
</body>
</html>

首先检查您是否正确使用了链接。对您的建议是使用 jQuery.min CDN 而不是 Bootstrap 提供的精简版本。为此，我遇到了很多问题。另外为了保持按钮右对齐，我在button 上给出了.ml-auto。如果您希望它左对齐，只需删除该类。希望对你有帮助

【讨论】：