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                ## 下拉菜單 用于顯示鏈接列表的可切換、有上下文的菜單。如果要實現下拉菜單的交互性, 要使用JavaScript 。 **實例** 將下拉菜單按鈕觸發器和下拉菜單都包裹在`.dropdown`里,或者另一個添加了`position: relative;`的元素。然后加入組成菜單的 HTML 代碼。 為下拉菜單的父元素設置`.dropdown`類,菜單向下彈出: ```html <div class="dropdown"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu" aria-labelledby="menu1"> <li>one</li> <li>two</li> <li>three</li> <li>four</li> </ul> </div> ``` ![](https://img.kancloud.cn/b7/8b/b78b12d158241912fde5d9ebdefbaa09_574x212.png) 為下拉菜單的父元素設置`.dropup`類,菜單向上彈出(默認是向下彈出的): ```html <div class="dropup"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu" aria-labelledby="menu1"> <li>one</li> <li>two</li> <li>three</li> <li>four</li> </ul> </div> ``` ![](https://img.kancloud.cn/5d/d0/5dd023de48d74d9338a7b8c5db3ca3f9_575x209.png) ***** **對齊** 默認情況下,下拉菜單自動沿著父元素的上沿和左側被定位為 100% 寬度。給`.dropdown-menu`添加`.dropdown-menu-right`類可以讓菜單右對齊。 ```html <div class="dropdown"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu dropdown-menu-right" aria-labelledby="menu1"> <li>one</li> <li>two</li> <li>three</li> <li>four</li> </ul> </div> ``` ![](https://img.kancloud.cn/43/ba/43ba66ff07dd67a4d3b904fd0ddef427_577x226.png) ***** **標題** 如果在下拉菜單中有幾組不同的動作,可以通過添加標題(也就是在需要設為標題的標簽上添加類 .dropdown-header )來區分一組動作。 ```html <div class="dropdown"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu dropdown-menu-right" aria-labelledby="menu1"> <li class="dropdown-header">第一部分</li> <li>two</li> <li>three</li> <li>four</li> <li class="dropdown-header">第二部分</li> <li>two</li> <li>three</li> <li>four</li> </ul> </div> ``` ![](https://img.kancloud.cn/38/da/38daa9fbc34ae6a5c79aaf913a313731_828x348.png) ***** **分割線** 為下拉菜單添加一條分割線,也就是在需要分割的標簽之前添加類 .divider ,還需要添加role="separator"這個屬性,用于將多個鏈接分組。它的作用跟標題差不多。 ```html <div class="dropdown"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu dropdown-menu-right" aria-labelledby="menu1"> <li>two</li> <li>three</li> <li>four</li> <li class="divider" role="separator"></li> <li>two</li> <li>three</li> <li>four</li> </ul> </div> ``` ![](https://img.kancloud.cn/b1/7f/b17ffc36c854f48805465b35f9c9913f_629x315.png) ***** **禁用菜單選項** 為下拉菜單中的`<li>`元素添加`.disabled`類,從而禁用相應的菜單項,讓該菜單項的鏈接變灰并失去鼠標懸停效果。 ```html <div class="dropdown"> <button class="btn btn-default dropdown-toggle" id="menu1" type="button" data-toggle="dropdown" ara-haspopup="true" aria-expanded="true">Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu dropdown-menu-right" aria-labelledby="menu1"> <li><a href="#">常規鏈接</a></li> <li class="disabled"><a href="#">禁用鏈接</a></li> <li><a href="#">其他鏈接</a></li> </ul> </div> ``` ![](https://img.kancloud.cn/74/b7/74b72965cc73dc16bc881bef83e6b7a4_689x215.png) 注意:被禁用的鏈接仍然可以點擊,除非你去掉鏈接的 href 屬性,或者使用JavaScript代碼阻止用戶點擊鏈接。
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