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Bootstrap v4 导航栏错误?

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本文介绍了Bootstrap v4 导航栏错误?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

问题来了.我从引导端(https://v4-alpha.getbootstrap.com/components/导航栏/).结果显示全尺寸导航栏，当屏幕变小时，导航栏可能会折叠.但是当我将代码插入到我的项目中时，它会显示:

https://ibb.co/fjBNhQ

如您所见，它始终处于折叠状态.我尝试了很多其他示例，但没有任何效果.代码如下:

<头><title>测试区域</title><link rel="stylesheet" href="media/css/bootstrap.min.css"><身体><div class="header"><div class="top-header"><div class="容器"><nav class="navbar navbar-toggleable-md navbar-light bg-faded"><button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="切换导航"><span class="navbar-toggler-icon"></span><a class="navbar-brand" href="#">Navbar</a><div class="collapse navbar-collapse" id="navbarNavAltMarkup"><div 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="#">功能</a><a class="nav-item nav-link" href="#">定价</a><a class="nav-item nav-link disabled" href="#">Disabled</a>

</nav>

<script src="media/js/jquery.min.js"></script><script src="media/js/popper.min.js"></script><script src="media/js/bootstrap.min.js"></script></html>

解决方案

您发布的代码仅适用于 Bootstrap alpha 6，不适用于 beta.这是因为 navbar-toggleable* 类在 Bootstrap 4 beta 中已更改为 navbar-expand*.

引导程序 4.0.0:https://www.codeply.com/go/0c0FC1Lrn2

 <a class="navbar-brand" href="#">Navbar</a><button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle导航"><span class="navbar-toggler-icon"></span><div class="collapse navbar-collapse" id="navbarNavAltMarkup"><div 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="#">功能</a><a class="nav-item nav-link" href="#">定价</a><a class="nav-item nav-link disabled" href="#">Disabled</a>

</nav>

另见:Bootstrap 4 导航栏布局使用 CDN 工作，使用下载的代码中断

Here is the problem. I took default navbar example from bootstrap side(https://v4-alpha.getbootstrap.com/components/navbar/). They show full size navbar in result, that can collapse, when screen gets smaller. But when I've inserted the code into my project, it shows this:

https://ibb.co/fjBNhQ

As you can see it is always collapsed. I tried a lot of other examples, but nothing workes. Here is the code:

<!DOCTYPE html>
<html>

<head>
  <title>Test area</title>
  <link rel="stylesheet" href="media/css/bootstrap.min.css">
</head>

<body>
  <div class="header">
    <div class="top-header">
      <div class="container">
        <nav class="navbar navbar-toggleable-md navbar-light bg-faded">
          <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
                              <span class="navbar-toggler-icon"></span>
                          </button>
          <a class="navbar-brand" href="#">Navbar</a>
          <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
            <div 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="#">Features</a>
              <a class="nav-item nav-link" href="#">Pricing</a>
              <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
          </div>
        </nav>
      </div>
    </div>
  </div>
  <script src="media/js/jquery.min.js"></script>
  <script src="media/js/popper.min.js"></script>
  <script src="media/js/bootstrap.min.js"></script>
</body>

</html>

解决方案

The code you posted will only work on Bootstrap alpha 6, not beta. This is because the navbar-toggleable* classes have changed to navbar-expand* as of Bootstrap 4 beta.

Bootstrap 4.0.0: https://www.codeply.com/go/0c0FC1Lrn2

   <nav class="navbar navbar-expand-lg navbar-light bg-faded">
          <a class="navbar-brand" href="#">Navbar</a>
          <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
          </button>
          <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
            <div 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="#">Features</a>
              <a class="nav-item nav-link" href="#">Pricing</a>
              <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
          </div>
   </nav>

Also see: Bootstrap 4 navbar layout works using CDN, breaks using downloaded code

这篇关于Bootstrap v4 导航栏错误?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-04 03:47
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