Bootstrap 4-响应式水平导航

Question

我遇到了一个Bootstrap 4navs的问题，如果导航链接的容器宽度太小，那么导航链接就会突出。这通常是移动设备的情况。

下面是一个示例：http://codepen.io/anon/pen/ZLKGrx

<div class="container">
  <div class="row">
    <div class="col-6 offset-3 columnbg">
      <ul class="nav nav-pills">
        <li class="nav-item">
          <a class="nav-link active" href="#">LongTabName</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">LongTabName</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">LongTabName</a>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled" href="#">LongTabName</a>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled" href="#">LongTabName</a>
        </li>
      </ul>
    </div>
  </div>
</div>

我想要实现一些适合于较小显示器的东西。我该怎么做呢？

Answer 1

col-6在最小的屏幕上只有一半的宽度，所以它不能准确地模拟移动屏幕的宽度。当导航的内容对于移动宽度来说太长时，您可以使用其他实用程序类来显示较少的内容(缩写。标签或仅仅是图标)。

<ul class="nav nav-pills">
        <li class="nav-item">
          <a class="nav-link active" href="#"><span class="hidden-xs-down">LongTabName</span><span class="hidden-sm-up">TN</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#"><span class="hidden-xs-down">LongTabName</span><span class="hidden-sm-up">TN</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#"><span class="hidden-xs-down">LongTabName</span><span class="hidden-sm-up">TN</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#"><span class="hidden-xs-down">LongTabName</span><span class="hidden-sm-up">TN</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#"><span class="hidden-xs-down">LongTabName</span><span class="hidden-sm-up">TN</span></a>
        </li>
      </ul>

http://www.codeply.com/go/WXqhlCDp9o

Answer 2

Bootstrap是为移动端优先构建的。遇到这个问题的唯一原因是您没有完全实现navbar

​

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
  <button class="navbar-toggler navbar-toggler-right" 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>
  <a class="navbar-brand" href="#">Navbar</a>

  <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">
        <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="text" placeholder="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

​

Answer 3

css中有一个技巧，可以帮助你根据屏幕width.height指定元素的大小：

@media (max-width: 600px) {
  .row {
     //change width here
  }
}

如你所见，当屏幕宽度小于600px (移动端应该更小)时，@media css将被覆盖;)