Python Web开发：Bootstrap组件使用

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概述

导航条一般在网页头部显示，给用户提供整个网站的浏览功能

Bootstrap提供的导航条可以在移动设备上折叠：展开或隐藏，且在窗口宽度增加时变为水平展开模式。

nav标签 表示导航条

实现步骤

定义导航栏

可以在nav中添加一个container容器 

<nav class="navbar navbar-default">
        <div class="container">

        </div>
</nav>

导航栏主题包含两部分：导航栏头部 和导航栏目

导航栏头部

通常情况下，导航栏头包含一个折叠按钮和一个“品牌”标签链接 

            <!-- 导航栏头部 -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example1"
                    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>
            </div>
            <a class="navbar-brand" href="#">Brand</a>

data-target:用于指定需要折叠的导航栏目。

sr-only属性的含义： 

https://segmentfault.com/a/1190000008004996?utm_source=tag-newest

导航栏目

            <!-- 导航栏目 -->
            <div class="collapse navbar-collapse" id="bs-example1">
                <ul class="nav navbar-nav">
                    <li class="active">
                        <a href="#">链接1</a>
                    </li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                            aria-expanded="false">下拉链接<span class="caret"></span>
                        </a>
                        <ul class="dropdown-menu">
                            <li><a href="#">链接2</a></li>
                            <li role="separator" class="divider"></li>
                            <li><a href="#">链接3</a></li>
                        </ul>
                    </li>
                </ul>
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">链接4</a></li>
                </ul>
            </div>

全部代码

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap导航栏使用实例</title>
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js">
    </script>
    <script src="js/bootstrap.min.js"></script>
</head>

<body>
    <nav class="navbar navbar-default">
        <div class="container">
            <!-- 导航栏头部 -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example1"
                    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>
            </div>
            <a class="navbar-brand" href="#">Brand</a>
            <!-- 导航栏目 -->
            <div class="collapse navbar-collapse" id="bs-example1">
                <ul class="nav navbar-nav">
                    <li class="active">
                        <a href="#">链接1</a>
                    </li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                            aria-expanded="false">下拉链接<span class="caret"></span>
                        </a>
                        <ul class="dropdown-menu">
                            <li><a href="#">链接2</a></li>
                            <li role="separator" class="divider"></li>
                            <li><a href="#">链接3</a></li>
                        </ul>
                    </li>
                </ul>
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">链接4</a></li>
                </ul>
            </div>
        </div>
    </nav>
</body>

</html>

完整版导航栏

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap导航栏使用实例</title>
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js">
    </script>
    <script src="js/bootstrap.min.js"></script>
</head>

<body>
     <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 -->
  </div><!-- /.container-fluid -->
</nav>
</body>

</html>
取自“http://www.openbrains.net/mediawiki/index.php?title=Python_Web开发：Bootstrap组件使用&oldid=25605”