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  3. Bootstrap - Navbar( Navbar)

Bootstrap - Navbar( Navbar)

导航栏是Bootstrap站点的突出功能之一。 Navbars是响应式“元”组件，可用作应用程序或站点的导航标题。 Navbars在移动视图中折叠，并在可用视口宽度增加时变为水平。 导航栏的核心包括网站名称和基本导航的样式。

默认导航栏

要创建默认导航栏 -

  • 将类.navbar, .navbar-default到“nav”标记。

  • 将role = "navigation"添加到上面的元素，以帮助获取可访问性。

  • 将标题类.navbar-header添加到“div”元素。 包含类navbar-brand的“a”元素。 这将使文本的大小略大。

  • 要添加指向导航栏的链接，只需添加类别为.nav, .navbar-nav的无序列表。

以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
默认导航栏演示

响应Navbar

要向导航栏添加响应功能，您要折叠的内容需要包含在

与类.collapse, .navbar-collapse 。 折叠性质由具有.navbar-toggle类的.navbar-toggle ，然后具有两个数据元素。 第一个是data-toggle ，用于告诉JavaScript如何处理按钮，第二个data-target指示要切换的元素。 然后 用类.icon-bar创建我们喜欢称之为汉堡包的按钮。 这将切换.nav-collapse “div”中的元素。 要使此功能起作用，您需要包含Bootstrap Collapse Plugin 。

以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <button type = "button" class = "navbar-toggle" 
         data-toggle = "collapse" data-target = "#example-navbar-collapse">
         <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 = "#">IoWiki</a>
   </div>
   <div class = "collapse navbar-collapse" id = "example-navbar-collapse">
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
响应式Navbar演示

Navbar中的表单

而不是使用导航.navbar-form Bootstrap Forms中的默认基于类的表单，使用.navbar-form类。 这可以确保窗体在窄视口中的正确垂直对齐和折叠行为。 使用对齐选项（在“组件对齐”部分中进行说明）来确定它在导航栏内容中的位置。

以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <form class = "navbar-form navbar-left" role = "search">
         <div class = "form-group">
            <input type = "text" class = "form-control" placeholder = "Search">
         </div>
         <button type = "submit" class = "btn btn-default">Submit</button>
      </form>    
   </div>
</nav>
新页面打开

Navbar中的按钮

您可以使用类.navbar-btn将按钮添加到不存在于“窗体”中的“按钮”元素，以使它们在导航.navbar-btn垂直居中。 .navbar-btn可用于“a”和“input”元素。

不要在.navbar-nav <a>元素上使用.navbar-btn和标准按钮类 。

以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <form class = "navbar-form navbar-left" role = "search">
         <div class = "form-group">
            <input type = "text" class = "form-control" placeholder = "Search">
         </div>
         <button type = "submit" class = "btn btn-default">Submit Button</button>
      </form>  
      <button type = "button" class = "btn btn-default navbar-btn">Navbar Button</button>
   </div>
</nav>
新页面打开

Navbar中的文本

要在元素中包装文本字符串，请使用类.navbar-text 。 这通常与“p”标签一起使用，以获得正确的前导和颜色。 以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <p class = "navbar-text">Signed in as Thomas</p>
   </div>
</nav>
新页面打开

Non-nav Links

如果要使用不在常规导航栏导航组件中的标准链接，请使用类navbar-link为默认和反向导航栏选项添加适当的颜色，如以下示例所示 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <p class = "navbar-text navbar-right">
         Signed in as 
         <a href = "#" class = "navbar-link">Thomas</a>
      </p>
   </div>
</nav>
非导航链接演示

组件对齐

您可以使用实用程序类.navbar-left或.navbar-right在nav links, forms, buttons, or text左侧或右侧对齐nav links, forms, buttons, or text等组件。 这两个类都将在指定的方向上添加一个CSS浮点数。 以下示例演示了这一点 - 

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <!--Left Align-->
      <ul class = "nav navbar-nav navbar-left">
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
      <form class = "navbar-form navbar-left" role = "search">
         <button type = "submit" class = "btn btn-default">Left align-Submit Button</button>
      </form> 
      <p class = "navbar-text navbar-left">Left align-Text</p>
      <!--Right Align-->
      <ul class = "nav navbar-nav navbar-right">
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
      <form class = "navbar-form navbar-right" role = "search">
         <button type = "submit" class = "btn btn-default">
            Right align-Submit Button
         </button>
      </form> 
      <p class = "navbar-text navbar-right">Right align-Text</p>
   </div>
</nav>
组件对齐演示

固定到顶部

Bootstrap导航栏的位置可以是动态的。 默认情况下，它是一个块级元素，根据其在HTML中的位置来定位。 使用一些辅助类，您可以将其放在页面的顶部或底部，也可以使其与页面静态滚动。

如果您希望导航栏固定在顶部，请将.navbar-fixed-top类添加到.navbar class 。 以下示例演示了这一点 -

要防止导航栏位于页面正文中的其他内容之上，请在标记中添加至少50个像素的填充或尝试自己的值。 
<nav class = "navbar navbar-default navbar-fixed-top" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
固定到顶部演示

固定到底部

如果您希望导航栏固定在页面底部，请将.navbar-fixed-bottom类添加到.navbar class 。 以下示例演示了这一点 - 

<nav class = "navbar navbar-default navbar-fixed-bottom" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href="#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class ="caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
固定到底部演示

静态顶部

要创建随页面滚动的导航栏，请添加.navbar-static-top类。 此类不需要将填充添加到“正文”。 

<nav class = "navbar navbar-default navbar-static-top" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
静态顶级演示

反向导航栏

要创建具有黑色背景和白色文本的反向导航栏，只需将.navbar-inverse类添加到.navbar类，如以下示例所示 -

要防止导航栏位于页面正文中的其他内容之上，请在标记中添加至少50个像素的填充或尝试自己的值。 
<nav class = "navbar navbar-inverse" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">IoWiki</a>
   </div>
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class = "caret"></b>
            </a>
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
         </li>
      </ul>
   </div>
</nav>
反向Navbar演示
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