Issue with Bootstrap 4 Navbar Toggle functionality (see code snippet below)

My issue with the bootstrap toggle button not working in the browser persists. How can I troubleshoot this problem?

For context, I have included the Bootstrap CDN in my head tag and added 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>
htmlcssbootstrap-4nav

Answer №1

Make sure not to start the id attribute with a pound sign (#). Instead, it should be written as: id="navbarSupportedContent"

<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>

Answer №2

Here is a solution to your issue:

To always hide the navbar links and display the toggler button, simply remove the .navbar-expand-md class.

<!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>

Answer №3

Dropdowns utilize Popper.js, a third-party library that enables dynamic positioning and viewport detection. It is important to remember to include popper.min.js before loading Bootstrap’s JavaScript files, or opt for bootstrap.bundle.min.js / bootstrap.bundle.js, which already includes Popper.js.

Check out the official Popper.js website here

This information can be found in the Bootstrap documentation section)))

Answer №4

data-id="#navbarSupportedContent"

The symbol # signifies the identifier.

The error lies in this section:

id="#navbarSupportedContent"

It should be corrected to:

id="navbarSupportedContent"

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