var app = angular.module('plunker', ['ui.bootstrap']);

app.controller('MainCtrl', function($scope) {
    $scope.name = 'World';
});

app.controller('DropdownCtrl', function($scope) {
 
    $scope.items = [
        "The first choice!",
        "And another choice for you.",
        "but wait! A third!"
    ];
});
<!DOCTYPE html>
<html ng-app="plunker">


<head>
  <meta charset="utf-8" />
  <title>AngularJS Plunker</title>

  <link data-require="bootstrap-css@*" data-semver="3.0.0" rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />

  <script>
    document.write('<base href="' + document.location + '" />');
  </script>
  <script data-require="angular.js@1.1.x" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.js" data-semver="1.1.5"></script>
  <script data-require="ui-bootstrap@0.5.0" data-semver="0.5.0" src="http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.6.0.js"></script>
  <script src="app.js"></script>
  <style>
    div.navbar-collapse.collapse {
      display: block;
      overflow: hidden;
      max-height: 0px;
      -webkit-transition: max-height .3s ease;
      -moz-transition: max-height .3s ease;
      -o-transition: max-height .3s ease;
      transition: max-height .3s ease;
    }
    div.navbar-collapse.collapse.in {
      max-height: 2000px;
    }
  </style>
</head>

<body ng-controller="MainCtrl">

  <nav class="navbar navbar-default" role="navigation">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">

      <button type="button" class="navbar-toggle" ng-init="navCollapsed = true" ng-click="navCollapsed = !navCollapsed">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" ng-class="!navCollapsed && 'in'">

      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link</a>
        </li>
        <li><a href="#">Link</a>
        </li>

        <li class="dropdown">
          <a href="#" class="dropdown-toggle" ng-controller="DropdownCtrl">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><a href="#">Separated link</a>
            </li>
            <li><a href="#">One more separated link</a>
            </li>
          </ul>
        </li>

      </ul>
      <form class="navbar-form navbar-left" role="search">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
      </form>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a>
        </li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">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><a href="#">Separated link</a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <!-- /.navbar-collapse -->
  </nav>

  <p>Hello {{name}}!</p>

</body>

</html>