Navbar Toggler Bootstrap 4-始终可见 [英] Navbar Toggler Bootstrap 4 - Always Visible

问题描述

我的问题很简单，我的 navbar-toggler 总是可见的；即使不需要它(在 lg 大小的屏幕上).

My problem is simple, my navbar-toggler is always visible; even when it doesn't need to be there (on a lg size screen).

文件

    <div class="navbar-header">
        <a href="#" class="navbar-brand">Logo</a>
    </div>
    <button type="button" class="navbar-toggle bg-dark" data-toggle="collapse" data-target="#mainNavBar" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon visible-sm"></span>
    </button>
    <div class="container-fluid">

推荐答案

您正在为导航栏使用过时且不完整的代码.

You are using outdated and incomplete code for your navbar.

navbar-expand-* 类组现在可以控制Bootstrap 4中的navbar扩展.

The navbar-expand-* class group is what controls the navbar expansion now in Bootstrap 4.

在以下代码段中， navbar-expand-lg 类使导航栏从较大的( lg )断点向上扩展(这意味着导航栏将折叠)如果屏幕小于 lg ):

In the following code snippet the navbar-expand-lg class makes the navbar expand from the large (lg) breakpoint and up (which means the navbar will be collapsed if the screen is smaller than lg):

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <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="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

参考:

https://getbootstrap.com/docs/4.0/components/navbar/

这篇关于Navbar Toggler Bootstrap 4-始终可见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！