Bootstrap 4 可切换导航栏 [英] Bootstrap 4 toggleable navbar

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本文介绍了Bootstrap 4 可切换导航栏的处理方法，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

我正在尝试从 Bootstrap 3.x 迁移到 4，但我在使用新导航栏时遇到了问题.无论我选择 navbar-toggleable-x 的哪个选项，导航栏总是显示汉堡按钮，就像它被折叠一样.

此 HTML 文档演示了我的问题.我在官方文档页面上得到了它.

<头><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0LQFAsjNJ0lyAFAsJnxtz"="匿名"><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4N.;<身体><nav class="navbar navbar-toggleable-md navbar-light bg-faded"><button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" 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="navbarNavDropdown"><ul class="navbar-nav"><li class="nav-item active"><a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a><li class="nav-item"><a class="nav-link" href="#">功能</a><li class="nav-item"><a class="nav-link" href="#">定价</a><li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">下拉链接</a><div class="下拉菜单" aria-labelledby="navbarDropdownMenuLink"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><a class="dropdown-item" href="#">这里还有别的东西</a>

</nav>

解决方案

自 Bootstrap 4 beta 起，toggleable 已替换为 expand.

现在它是expand"断点，而不是toggle"断点，逻辑会相应改变，所以 navbar-toggleable-md 现在是 navbar-expand-lg...

https://www.codeply.com/go/Io0duaPkqz

</nav>

https://www.codeply.com/go/Io0duaPkqz

如果您希望导航栏水平展开，则需要一个 navbar-expand* 类，否则导航栏默认为移动的、垂直折叠的版本.

更多关于 Bootstrap 4 从 alpha 6 到 beta 的变化

I'm trying to migrate from Bootstrap 3.x to 4 and I'm having problems with the new navbar. No matter which options for navbar-toggleable-x I choose, navbar always shows hamburger button, like it is collapsed.

This HTML document demonstrates my problem. I got it on official documentation page.

<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" 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="navbarNavDropdown">
    <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="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown link
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>
</body>
</html>

解决方案

As of Bootstrap 4 beta, toggleable has been replaced with expand.

Now that it's the "expand" breakpoint, and not the "toggle" breakpoint, the logic changes accordingly so navbar-toggleable-md would now be navbar-expand-lg..

https://www.codeply.com/go/Io0duaPkqz

<nav class="navbar navbar-expand-lg navbar-light bg-faded">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" 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="navbarNavDropdown">
    <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="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown link
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

https://www.codeply.com/go/Io0duaPkqz

A navbar-expand* class is needed if you want the navbar to expand horizontally, otherwise the Navbar defaults to the mobile, vertically collapsed version.

More on Bootstrap 4 changes from alpha 6 to beta

这篇关于Bootstrap 4 可切换导航栏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IT屋！

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