Bootstrap导航栏显示为垂直而不是水平 [英] Bootstrap navbar is displaying vertically instead of horizontally

问题描述

我正在使用CodePen进行项目，并且正在使用引导程序制作导航栏.但是由于某种原因，它是垂直显示而不是水平显示.即使我从 W3Schools 示例和

I'm working on a project using CodePen and I'm using bootstrap to make a navbar. But for some reason it's displaying vertically instead of horizontally. Even when I copy and paste code from the W3Schools examples and the Bootstrap website. I don't know what else to do. Please help.

    <nav class="navbar navbar-default">
      <div class="container-fluid">
        <div class="navbar-header">
          <a class="navbar-brand" href="#">WebSiteName</a>
        </div>
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a></li>
          <li><a href="#">Page 1</a></li>
          <li><a href="#">Page 2</a></li>
          <li><a href="#">Page 3</a></li>
        </ul>
      </div>

---

这是Bootstrap网站上的示例代码:

    <nav class="navbar navbar-default">
      <div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
  <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
    <span class="sr-only">Toggle navigation</span>
    <span class="icon-bar"></span>
    <span class="icon-bar"></span>
    <span class="icon-bar"></span>
  </button>
  <a class="navbar-brand" href="#">Brand</a>
</div>

<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
  <ul class="nav navbar-nav">
    <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
    <li><a href="#">Link</a></li>
    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
      <ul class="dropdown-menu">
        <li><a href="#">Action</a></li>
        <li><a href="#">Another action</a></li>
        <li><a href="#">Something else here</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Separated link</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">One more separated link</a></li>
      </ul>
    </li>
  </ul>
  <form class="navbar-form navbar-left">
    <div class="form-group">
      <input type="text" class="form-control" placeholder="Search">
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
  </form>
  <ul class="nav navbar-nav navbar-right">
    <li><a href="#">Link</a></li>
    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
      <ul class="dropdown-menu">
        <li><a href="#">Action</a></li>
        <li><a href="#">Another action</a></li>
        <li><a href="#">Something else here</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Separated link</a></li>
      </ul>
    </li>
  </ul>
</div><!-- /.navbar-collapse -->

---

两者都不起作用.是的，我已经三遍检查了< link> 和< script> 标签.

这是我的CodePen

推荐答案

首先像在注释中一样，您正在使用bootstrap 3标记，并且同时链接到bootstrap 3和4，请删除bootstrap 4 css.然后，您需要具有 collapse navbar-collapse 类的div，因此只需将其添加到id为 nav 的div中，如下所示:

First like in the comments you are using bootstrap 3 markup and you are linking to both bootstrap 3 and 4 remove the bootstrap 4 css. Then you need to have the div with the class of collapse navbar-collapse so just add this to the div that has the id of nav just like the following:

<nav class="navbar navbar-inverse">
  <div class="container-fluid">

    <div class="navbar-header">
      <a class="navbar-brand" href="#about">
        <span style="font-family: 'Source Code Pro', Monospace; color:green"><i class="fa fa-code"></i>Ryan</span></a>
    </div>
    <div class="collapse navbar-collapse"  id="nav">
    <ul class="nav navbar-nav">
      <li><a href="#about">About</a></li>
      <li><a href="#portfolio">Portfolio</a></li>
      <li><a href="#contact">Contact</a></li>
    </ul>
    </div>
  </div>
</nav> 

您可能还希望将折叠按钮添加到导航栏标题中，否则您的链接将不会以移动宽度显示，因此它看起来像:

You may want to add the collapse button to the navbar header as well otherwise your links wont show up at mobile widths so it would look like:

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#nav" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#about">
        <span style="font-family: 'Source Code Pro', Monospace; color:green"><i class="fa fa-code"></i>Ryan</span>
      </a>
    </div>
    <div class="collapse navbar-collapse"  id="nav">
    <ul class="nav navbar-nav">
      <li><a href="#about">About</a></li>
      <li><a href="#portfolio">Portfolio</a></li>
      <li><a href="#contact">Contact</a></li>
    </ul>
    </div>
  </div>
</nav> 

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