运行NuGet更新后MVC引导导航栏不起作用

问题描述

我们更新了所有NuGet软件包后，一个MVC应用程序中断了.尝试一切之后，我创建了一个新的MVC应用程序，更新了NuGet软件包和基本的导航栏...

An MVC app broke after we updated all the NuGet packages. After trying everything I created a new MVC app, updated the NuGet packages and the basic navbar...

<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>
            <a class="navbar-brand" href="/">Application name</a>
        </div>
        <div class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li><a href="/">Home</a></li>
                <li><a href="/Home/About">About</a></li>
                <li><a href="/Home/Contact">Contact</a></li>
            </ul>

<ul class="nav navbar-nav navbar-right">
    <li><a href="/Account/Register" id="registerLink">Register</a></li>
    <li><a href="/Account/Login" id="loginLink">Log in</a></li>
</ul>


        </div>
    </div>
</div>

...看起来像这样...

... looks like this ...

...然后单击图标...

...and clicking the icon...

有什么想法会导致这种情况吗?

Any ideas what could be causing this?

尝试将Bootstrap.css和Bootstrap.js手动添加到_Layout.vbhtml中，但没有区别

Have tried manually adding Bootstrap.css and Bootstrap.js to _Layout.vbhtml, but no difference

谢谢

推荐答案

最后，我管理了HTML和您的HTML.与版本3相比，Bootstrap 4有很多更改.关于标记，您必须进行以下更改:

Finally, I managed my HTML and yours.There're a lot of changes in Bootstrap 4 in compare to version 3. Regarding your markup, you have to change:

1. 将"Navbar-inverse"改为"Navbar-dark"，并使用颜色"bg-dark".
2. 为按钮添加一些属性，例如"aria-controls"，"aria-expanded"，"aria-label"和"data-target"，以链接到另一个元素.
3. 可折叠元素的属性"id".
4. 对于列表元素(标签LI)，应添加class ="nav-item"
5. 对于链接之外的列表元素，请添加class ="nav-link".
6. 我建议在"definiton"列表中添加"mr-auto".

下面的所有更改.在此处进行了测试.

All changes below. Tested here.

<nav class="navbar navbar-expand-sm navbar-dark fixed-top bg-dark">
  <div class="container">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    </button>
    <a class="navbar-brand" href="/">Application name</a>
    <div class="navbar-collapse collapse" id="navbarSupportedContent">
      <ul class="nav navbar-nav mr-auto">
        <li class="nav-item"><a href="/" class="nav-link">Home</a></li>
        <li class="nav-item"><a href="/Home/About" class="nav-link">About</a></li>
        <li class="nav-item"><a href="/Home/Contact" class="nav-link">Contact</a></li>
      </ul>

      <ul class="nav navbar-nav navbar-right mr-auto">
        <li class="nav-item"><a href="/Account/Register" id="registerLink" class="nav-link">Register</a></li>
        <li class="nav-item"><a href="/Account/Login" id="loginLink" class="nav-link">Log in</a></li>
      </ul>

    </div>
  </div>
</nav>

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