html5 - dropdown menu that has a sub-dropdown menu in bootstrap -


i new bootstrap, , have problem in dropdown menu have sub-dropdown menu. try run code seems not working.

<div class="tabbable mainmenu visible-phone btn-group">                 <a class="btn dropdown-toggle" data-toggle="dropdown" href="#">                 menu                 <span class="caret"></span>                 </a>                 <ul class="dropdown-menu">                     <li><a href="#">submenu 1</a></li>                     <li>                         <a class="dropdown-toggle" data-toggle="dropdown" href="#">                         menu down                         <span class="caret"></span>                         </a>                         <ul class="dropdown-menu">                             <li>submenu 1</li>                         </ul>                     </li>                 </ul>             </div>

when click menu shows dropdown menus when click menu down didn't show sub-dropdown menu dropdown menu gone.

did wrong in code? appreciated.. in advance

i think have add class ".dropdown-submenu" "li" going keep submenu. it's shown below: 

<li class="dropdown-submenu">     <a class="dropdown-toggle" data-toggle="dropdown" href="#">          menu down          <span class="caret"></span>     </a>     <ul class="dropdown-menu">          <li>submenu 1</li>     </ul> </li>

hope helps.


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