css - bootstrap 3.1.1 navbar wont collapse on phone -

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i have following code. on phone, navbar wont collapse after expanding, have click button toggle style. idea?

<div class="navbar navbar-inverse navbar-fixed-top">         <div class="container">             <div class="navbar-header">                 <a ui-sref="default" class="navbar-brand"></a>                  <button class="navbar-toggle" type="button" data-toggle="collapse" data-target="#navbar-main">                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                 </button>             </div>             <div class="collapse navbar-collapse" id="navbar-main">                 <ul class="nav navbar-nav">                      <li ng-repeat="top in topnav" ng-class="{active: isactive(top.view), dropdown:top.subnav.length>=0}">                         <a ui-sref="{{top.state}}" ng-show="top.subnav.length==0">{{top.name}}</a>                         <a href="" class="dropdown-toggle" ng-show="top.subnav.length > 0" data-toggle="dropdown">{{top.name}} <b class="caret"></b></a>                         <ul class="dropdown-menu" ng-show="top.subnav.length > 0">                             <li ng-repeat="sub in top.subnav">                                 <a ui-sref="{{sub.state}}">{{sub.name}}</a>                             </li>                         </ul>                     </li>                  </ul>             </div>         </div>

working fiddle

just use this;

   <div class="navbar navbar-inverse">             <div class="container">               <div class="navbar-header">                 <button data-target=".navbar-collapse" data-toggle="collapse" class="navbar-toggle" type="button">                   <span class="sr-only">toggle navigation</span>                   <span class="icon-bar"></span>                   <span class="icon-bar"></span>                   <span class="icon-bar"></span>                 </button>                 <a href="#" class="navbar-brand">project name</a>               </div>               <div class="navbar-collapse collapse">                 <ul class="nav navbar-nav">                   <li class="active"><a href="#">home</a></li>                   <li><a href="#about">about</a></li>                   <li><a href="#contact">contact</a></li>                   <li class="dropdown">                     <a data-toggle="dropdown" class="dropdown-toggle" href="#">dropdown <b class="caret"></b></a>                     <ul class="dropdown-menu">                       <li><a href="#">action</a></li>                       <li><a href="#">another action</a></li>                       <li><a href="#">something else here</a></li>                       <li class="divider"></li>                       <li class="dropdown-header">nav header</li>                       <li><a href="#">separated link</a></li>                       <li><a href="#">one more separated link</a></li>                     </ul>                   </li>                 </ul>               </div><!--/.nav-collapse -->             </div>           </div>

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