Troubleshooting Display Problems when Switching Bootstrap Themes in ASP.NET MVC

I recently made changes to my MVC project by switching the default Bootstrap theme to Bootswatch - Cosmos. However, I am facing an issue with the Navbar as shown in the image below:

View Header Display Issue Image

Initially, I was using Bootstrap 3.0 and Bootswatch 3.0 to avoid any version conflicts.

Here are the steps I have taken so far:

  1. Added cosmos-bootstrap.css and cosmos-bootstrap.min.css to the content folder
  2. Referenced the CSS file in my BundleConfig.cs:

    bundles.Add(new StyleBundle("~/Content/css").Include(
                  "~/Content/bootstrap.css",
                  "~/Content/cosmos-bootstrap.css",
                  "~/Content/site.css"));
    
  3. Checked my _Layout.cshtml for Styles reference:

    @Styles.Render("~/Content/css")
    
  4. Upgraded Bootstrap to v4 and tried Cosmos v4, but still encountered the same issue.

The problem seems to be specific to the Navbar, as other fonts and buttons from Cosmos display fine. I also tested other Bootstrap themes, all resulting in the same Navbar issue.

Any assistance on this matter would be highly appreciated.

EDIT: HTML code for Navbar is provided below:

<body>
<div class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            @Html.ActionLink("Portal", "Index", "Home", new { area = "" }, new { @class = "navbar-brand" })
        </div>
        <div class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li>@Html.ActionLink("Home", "Index", "Home")</li>
                <li>@Html.ActionLink("About", "About", "Home")</li>
                <li>@Html.ActionLink("Contact", "Contact", "Home")</li>
            </ul>
            @Html.Partial("_LoginPartial")
        </div>
    </div>
</div>
<div class="container body-content">
    @RenderBody()
    <hr />
    <footer>
        <p>&copy; @DateTime.Now.Year - TEST IT SOLUTIONS</p>
    </footer>
</div>

@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/bootstrap")
@RenderSection("scripts", required: false)

Answer №1

Bootstrap 4 has undergone major changes compared to Bootstrap 3, making the two versions completely incompatible with each other.

Therefore, migrating a Bootstrap theme from version 3 to version 4 requires manual adjustments. Due to the significant differences between the two versions, there is no simple or automated way to perform this migration. Any automated attempt would necessitate manual tweaking of various elements.

P.S. If your objective is to rectify the header, share the entire code snippet (HTML output) in your question so that it can be reviewed accordingly.

Edit:

After reviewing the code snippet you provided, it is evident that your theme was developed using Bootstrap 3 and is not compatible with Bootstrap 4. The existing code reflects Bootstrap 3 syntax.

Below is an example of what a Bootstrap 4 navbar code looks like (adjustments may be required for ASP.NET code; click the "run code snippet" button below to visualize it in action):

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<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/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

<nav class="navbar navbar-expand-lg navbar-dark bg-dark sticky-top">
    <div class="container">
        <a class="navbar-brand" href="#">BrandName</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 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="#">Contact</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" href="#">Action</a>
                        <a class="dropdown-item" href="#">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" href="#">Disabled</a>
                </li>
            </ul>
        </div>
    </div>
</nav>
<!-- End of navbar -->

<div style="padding:1000px 0;">hi</div>

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