菜单toogle按钮在引导4中不起作用

Question

In bootstrap 4 when the header becomes responsive the breadcrumb button not working as it is.

I have included the Bootstrap 4 CSS and bootstrap 4 js

please help me fix the issue

Code:

 .navbar { height:100px; } 

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"> <nav class="navbar navbar-expand-md navbar-light bg-light fixed-top"> <div class="container nopadding"> <a class="navbar-brand" href="#"> logo </a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" 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 ml-auto "> <li class="nav-item active"> <a class="nav-link" href="#">HOME <span class="sr-only">(current)</span></a> </li> <li class="nav-item"> <a>SERVICES</a> </li> <li class="nav-item"> <a>SUPPORT</a> </li> <li class="nav-item"> <a>TECHNOLOGY</a> </li> </ul> </div> </div> </nav> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script> 

Image:

Answer 1

Check you error in console Uncaught Error: Bootstrap's JavaScript requires jQuery. jQuery must be included before Bootstrap's JavaScript. Uncaught Error: Bootstrap's JavaScript requires jQuery. jQuery must be included before Bootstrap's JavaScript.

add jquery library before the bootstrap js

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<nav class="navbar navbar-expand-md navbar-light bg-light fixed-top">
    <div class="container nopadding">
        <a class="navbar-brand" href="#">
            logo
        </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault"
            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 ml-auto ">
                <li class="nav-item active">
                    <a class="nav-link" href="#">HOME <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a>SERVICES</a>
                </li>
                <li class="nav-item">
                    <a>SUPPORT</a>
                </li>
                <li class="nav-item">
                    <a>TECHNOLOGY</a>
                </li>

            </ul>

        </div>

    </div>

</nav>

 <script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>