Symfony，引导程序下拉不起作用？

迪伦·伯恩

我试图按照引导程序模板为我的网页制作导航栏。我已将它附加到我的 Symfony 项目的 base.html.twig 文件中。除了单击时不显示的下拉菜单外，它工作正常

这是我的树枝文件

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>{% block title %}Health Centre Ireland{% endblock %}</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css"
          integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
    <link rel="stylesheet" href="{{ asset('css/styles.css') }}"/>
    {% block stylesheets %}{% endblock %}
    <link rel="icon" type="image/x-icon" href="{{ asset('redcross.ico') }}" />
</head>

<body>

<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
    <a class="navbar-brand" a href="#">Health Centre Ireland</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse"
            data-target="#navbarsExampleDDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
        <li class="nav-item">
            <a class="nav-link" href="#">Home <span class="sr-only"></span> </a>
        </li>

       <li class="nav-item">
          <a class="nav-link" href="#">Calender</a>
       </li>

        <li class="nav-item">
            <a class="nav-link" href="#">Message Board</a>
        </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" 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="#">My Profile</a>
                    <a class="dropdown-item" href="{{ logout_path('main') }}">Log Out</a>
                    <a class="dropdown-item" href="#">Delete Profile</a>
                </div>
            </li>
        </ul>
    </div>
</nav>

</body>

在关闭正文和 html 之前，我曾尝试将 JavaScript 放在文档底部，但这会使导航栏以外的页面内容消失。任何帮助将不胜感激，谢谢

尼科网

您需要像引导程序的官方文档（https://getbootstrap.com/docs/4.0/getting-started/introduction/）中所示添加javascript

<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/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>

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