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Bootstrap 4 Navbar Toggle not working (code pasted below)

I can't get the bootstrap toggle button to work on the browser, how can I identify the problem?

PS I have already added the Bootstrap CDN in my head tag and have added the jQuery and JavaScript in the body.

<nav class="navbar navbar-dark bg-dark navbar-expand-md">
      <a href="#" class="navbar-brand">NAVBAR</a>
      <button class="navbar-toggler" 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">
          <li class="nav-item">
            <a href="#" class="nav-link">HOME</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">ABOUT</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">TICKETS</a>
          </li>
        </ul>
      </div>
    </nav>
Solution

  • Try this

    remove .navbar-expand-md class to ALWAYS hide navbar links and display the toggler button.

    <!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" 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">
          <li class="nav-item">
            <a href="#" class="nav-link">HOME</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">ABOUT</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">TICKETS</a>
          </li>
        </ul>
      </div>
</nav>


</body>
</html>