css - Dropdown has no content (bootstrap framework) -

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hi have following code dropdown using bootstrap-sass gem:

<div class="nav-collapse collapse" style="height:0px;">             <nav>               <ul class= "nav pull-right">                 <% if signed_in? %>                     <li><%= link_to "profile", current_user %></li>                   <li><%= link_to "users", users_path %></li>                   <li id = "fat-menu" class="dropdown">                     <a href="#" class="dropdown-toggle" data-toggle="dropdown">                       account <b class="caret"></b>                     </a>                     <ul class="dropdown-menu">                       <li><%= link_to "settings", edit_user_path(current_user) %></li>                       <li class="divider"></li>                       <li>                         <%= link_to "sign out", signout_path, method: "delete" %>                       </li>                     </ul>                   </li>                   <% else %>                     <li><%= link_to "sign in", signin_path %></li>                 <%end%>               </ul>             </nav>         </div>

however when click on account shows following , not contents:

enter image description here

you can see little white triangle shows it's been clicked on no contents. when i'm debugging can see menu in chrome here: enter image description here

instead of:

<a href="#" class="dropdown-toggle" data-toggle="dropdown">   account <b class="caret"></b> </a>

you should use:

<a href="#fat-menu" class="dropdown-toggle" data-toggle="dropdown">   account <b class="caret"></b> </a>

also, please provide javascript file enables menu (it isn't including js files, must enable dropdown somewhere). this:

$(".dropdown-toggle").dropdown();

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