Bootstrap 5 Navbar Toggler Fails in ASP.Net Core 8 MVC App

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I have created a simple ASP.Net Core 8 site in VS 2022 and installed Bootstrap 5.3.3 and jQuery 3.7.1 using libman. I copied the most basic menu sample from GetBootstrap. When the screen width is small, the menu disappears and the burger icon is displayed, but nothing happens when I click it.
What could be causing this issue?

libman.json

JSON
{
  "defaultProvider": "cdnjs",
  "libraries": [
    {
      "provider": "cdnjs",
      "library": "jquery@3.7.1",
      "destination": "wwwroot/lib/jquery/"
    },
    {
      "provider": "cdnjs",
      "library": "jqueryui@1.14.1",
      "destination": "wwwroot/lib/"
    },
    {
      "provider": "cdnjs",
      "library": "twitter-bootstrap@5.3.3",
      "destination": "wwwroot/lib/bootstrap/"
    }
  ],
  "version": "1.0"
}

HTML of page:

HTML
<!DOCTYPE html>
<html lang="en-ie">
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1" />

    <link href="~/lib/bootstrap/css/bootstrap.css" rel="stylesheet" />
    <link href="~/css/custom.css" rel="stylesheet" />
    <script src="~/lib/jquery/jquery.js"></script>

</head>
<body>
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container">
            <a class="navbar-brand" href="#">Your App</a>
            <button class="navbar-toggler"
                    type="button"
                    data-toggle="collapse"
                    data-target="#navbarNav"
                    aria-controls="navbarNav"
                    aria-expanded="false"
                    aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarNav">
                <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 class="nav-link" href="#">About</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Services</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Contact</a>
                    </li>
                </ul>
            </div>
        </div>
    </nav>
    <div class="container">
        <p>test</p>
    </div>
    <script src="~/lib/bootstrap/js/bootstrap.min.js"></script>
</body>
</html>

Comments 0

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

The issue is that the data attributes for the navbar toggler are using the Bootstrap 4 naming conventions (data-toggle and data-target) instead of the Bootstrap 5 ones. In Bootstrap 5 these attributes have been renamed to include the "bs" prefix. You need to update your markup as follows:

HTML
<button class="navbar-toggler"
        type="button"
        data-bs-toggle="collapse"
        data-bs-target="#navbarNav"
        aria-controls="navbarNav"
        aria-expanded="false"
        aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
</button>

Also, ensure that you include the proper Bootstrap JS bundle (which includes Popper) if needed. For example, you might want to reference the bundle version:

HTML
<script src="~/lib/bootstrap/js/bootstrap.bundle.min.js"></script>

By updating the attributes to the Bootstrap 5 conventions and using the correct JS bundle, your menu should work as expected when the burger icon is clicked.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by PlutonianMariner787 • 1 month ago

When the screen width is small, the menu disapears and the burger bars are shown but nothing happens when I click on it?

You can try to modify the code of toggler button to specify data-bs-toggle and data-bs-target attributes as below.

HTML
<a class="navbar-brand" href="#">Your App</a>
<button class="navbar-toggler"
        type="button"
        data-bs-toggle="collapse" data-bs-target="#navbarNav"
        aria-controls="navbarSupportedContent"
        aria-expanded="false"
        aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
</button>

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Bootstrap 5 Navbar Toggler Fails in ASP.Net Core 8 MVC App

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