The Bootstrap dropdown menu vanishes once the toggler-icon is clicked

Recently, I copied and pasted a navigation bar from Bootstrap's documentation available at https://getbootstrap.com/docs/4.3/components/navbar/

After integrating this code into my project, everything seemed to work fine except for one issue. When I resize the browser to a mobile size and click on the hamburger menu, all of my menu items briefly appear and then vanish quickly. Strangely, I have to click the hamburger menu twice for the anchor tags to remain visible. This same behavior occurs with the customized navbar code that I have included below:

Here is the code I used:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <img id="navbarLogo" src="img/Home/Crunchsoft.techSignature.png">
    <button class="navbar-toggler collapsed" type="button" data-toggle="collapse" data-target="#navbar"
        aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="navbar-collapse collapse" id="navbar">
        <div id="navbar-items" class="navbar-nav">
            <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
            <a class="nav-item nav-link" href="#">Services</a>
            <a class="nav-item nav-link" href="#">Contact</a>
            <a class="nav-item nav-link" href="#">About</a>
        </div>
    </div>
</nav>

Furthermore, I've even tried various solutions found on Stack Overflow to resolve this issue, such as:

Bootstrap dropdown disappears after clicking it

Bootstrap 4 Toggle Checkbox within Dropdown menu

Keep Bootstrap dropdown open on click

Unfortunately, none of these solutions have worked for me. To add to the frustration, creating the same navbar in a fiddle seemed to work perfectly fine, but the issue persists within my Blazor project.

https://jsfiddle.net/MaxTaylor/6rftaw3o/1/

Even after trying to isolate the problem by commenting out all stylesheets except for Bootstrap, the issue remains unresolved. I am utilizing Blazor in my .AspNetCore project, and strangely enough, the same code seems to work flawlessly in Visual Studio Code but not in my Blazor project.

Answer №1

When incorporating bootstrap into a blazor project, it is crucial to make several adjustments to ensure the smooth operation of bootstrap javascript.

In my experience, I tend to steer clear of using javascript in blazor projects for tasks that can be accomplished using C#, unless there are specific scenarios that necessitate accessing javascript APIs.

Here is a sample case where C# can handle the task:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <img id="navbarLogoWords" src="/img/home/Crunchsoft.techSignature.png"/>

        <button @onclick="toggleNavBar" class="navbar-toggler" type="button" aria-expanded="@expandedState" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="navbar-collapse collapse @cssShowMenu">
            <div id="navbar-items" class="navbar-nav">
                <a @onclick="collapsedNavBar" class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
                <a @onclick="collapsedNavBar" class="nav-item nav-link" href="Services">Services</a>
                <a @onclick="collapsedNavBar" class="nav-item nav-link" href="#">Contact</a>
                <a @onclick="collapsedNavBar" class="nav-item nav-link" href="#">About</a>
            </div>
        </div>
</nav>
@code {
    private bool expandedState = false;
    private string cssShowMenu = null;

    private void toggleNavBar()
    {
        expandedState = !expandedState;
        cssShowMenu = expandedState ? "show" : null;
    }

    private void collapsedNavBar()
    {
        expandedState = false;
        cssShowMenu = expandedState ? "show" : null;
    }
}

Hopefully, this code excerpt proves helpful to you or anyone seeking assistance. >_<

Answer №2

After thoroughly testing the two code snippets you provided, it seems that they are functioning correctly according to my observations. It is probable that there is a CSS class that is conflicting with the functionality of your hamburger menu.

Since I am unable to view the custom CSS, I recommend checking the customSoftware.css and SeanStyle.css files to see if there are any styles targeting the Button or hamburger classes.

Answer №3

After encountering compatibility issues with Bootstrap components in Blazor, I decided to create my own navbar using a Razor component.

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <img id="navbarLogoWords" src="/img/home/Crunchsoft.techSignature.png"/>

        <button onclick="toggleNavBar()" class="navbar-toggler" type="button"
                aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="navbar-collapse collapse" id="navbar">
            <div id="navbar-items" class="navbar-nav">
                <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
                <a class="nav-item nav-link" href="Services">Services</a>
                <a class="nav-item nav-link" href="#">Contact</a>
                <a class="nav-item nav-link" href="#">About</a>
            </div>
        </div>
</nav>

Instead of relying on external JavaScript files, I created my own JavaScript function within the component:

function toggleNavBar() {
    var x = document.getElementById("navbar");
    if (x.style.display === "block") {
        x.style.display = "none";
    } else {
        x.style.display = "block";
    }
}

The final step was linking the JavaScript file in my _Host.cshtml:

<script src="/javaScript/scripts.js"></script>

While considering using C# within the component for Blazor, I struggled to implement it and opted for JavaScript instead.

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