ブートストラップ-ドロップダウン

この章では、Bootstrapドロップダウンメニューについて説明します。ドロップダウンメニューは、リンクをリスト形式で表示するための切り替え可能なコンテキストメニューです。これは、ドロップダウンJavaScriptプラグインを使用してインタラクティブにすることができます。

ドロップダウンを使用するには、クラス内でドロップダウンメニューをラップするだけです .dropdown次の例は、基本的なドロップダウンメニューを示しています-

<div class = "dropdown">
   
   <button type = "button" class = "btn dropdown-toggle" id = "dropdownMenu1" data-toggle = "dropdown">
      Topics
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu" aria-labelledby = "dropdownMenu1">
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Java</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Data Mining</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">
            Data Communication/Networking
         </a>
      </li>
      
      <li role = "presentation" class = "divider"></li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Separated link</a>
      </li>
   </ul>
   
</div>

オプション

配置

クラスを追加して、ドロップダウンメニューを右に揃えます .pull-right に .dropdown-menu。次の例はこれを示しています-

<div class = "dropdown">
   
   <button type = "button" class = "btn dropdown-toggle" id = "dropdownMenu1" data-toggle = "dropdown">
      Topics
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu pull-right" role = "menu" aria-labelledby = "dropdownMenu1">
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Java</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Data Mining</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">
            Data Communication/Networking
         </a>
      </li>
      
      <li role = "presentation" class = "divider"></li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Separated link</a>
      </li>
   </ul>
   
</div>

ヘッダー

クラスを使用して、任意のドロップダウンメニューのアクションのセクションにラベルを付けるためのヘッダーを追加できます dropdown-header。次の例はこれを示しています-

<div class = "dropdown">
   
   <button type = "button" class = "btn dropdown-toggle" id = "dropdownMenu1" data-toggle = "dropdown">
      Topics
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu" aria-labelledby = "dropdownMenu1">
      <li role = "presentation" class = "dropdown-header">Dropdown header</li>
      
      <li role = "presentation" >
         <a role = "menuitem" tabindex = "-1" href = "#">Java</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Data Mining</a>
      </li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">
            Data Communication/Networking
         </a>
      </li>
      
      <li role = "presentation" class = "divider"></li>
      <li role = "presentation" class = "dropdown-header">Dropdown header</li>
      
      <li role = "presentation">
         <a role = "menuitem" tabindex = "-1" href = "#">Separated link</a>
      </li>
   </ul>
   
</div>