Angular: Empty Fiddle

http://angularjs.org/

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="//code.jquery.com/jquery-1.12.0.min.js"></script>
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.0-rc.2/angular.min.js"></script>
<script type="text/ng-template" id="tree_item_renderer.html">
  <a href="#" class="dropdown-toggle" data-toggle="dropdown">{{data.name}}</a>

  <ul class="dropdown-menu">
    <li ng-if="data.nodes.length != 0" class="menu-item dropdown dropdown-submenu" ng-repeat="data in data.nodes" ng-include="'tree_item_renderer.html'"></li>
    <li ng-if="data.nodes.length == 0" class="menu-item" ng-repeat="data in data.nodes" ng-include="'tree_item_renderer.html'"></li>
  </ul>
</script>

<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu" style="display: block; position: static; margin-bottom: 5px; *width: 180px;">
  <li class="menu-item dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Menu<b class="caret"></b></a>
    <ul class="dropdown-menu" ng-app="Application" ng-controller="TreeController">
      <li class="menu-item dropdown dropdown-submenu" ng-repeat="data in tree" ng-include="'tree_item_renderer.html'"></li>
    </ul>

  </li>
</ul>

CSS

.dropdown-submenu {
  position: relative;
}
.red{
  color:red;
}
.dropdown-submenu>.dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -6px;
  margin-left: -1px;
  -webkit-border-radius: 0 6px 6px 6px;
  -moz-border-radius: 0 6px 6px 6px;
  border-radius: 0 6px 6px 6px;
}

.dropdown-submenu:hover>.dropdown-menu {
  display: block;
}

.dropdown-submenu>a:after {
  display: block;
  content: " ";
  float: right;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
  border-width: 5px 0 5px 5px;
  border-left-color: #cccccc;
  margin-top: 5px;
  margin-right: -10px;
}

.dropdown-submenu:hover>a:after {
  border-left-color: #ffffff;
}

.dropdown-submenu.pull-left {
  float: none;
}

.dropdown-submenu.pull-left>.dropdown-menu {
  left: -100%;
  margin-left: 10px;
  -webkit-border-radius: 6px 0 6px 6px;
  -moz-border-radius: 6px 0 6px 6px;
  border-radius: 6px 0 6px 6px;
}

JavaScript

angular.module("myApp", []).
controller("TreeController", ['$scope', function($scope) {
  $scope.delete = function(data) {
    data.nodes = [];
  };
  $scope.add = function(data) {
    var post = data.nodes.length + 1;
    var newName = data.name + '-' + post;
    data.nodes.push({
      name: newName,
      nodes: []
    });
  };


  $scope.tree = [{
    name: "Level1",
    nodes: [{
      name: "Link1",
      nodes: []
    }, {
      name: "Level2",
      nodes: [{
        name: "Link3",
        nodes: []
      }, {
        name: "Level3",
        nodes: [{
          name: "Link4",
          nodes: []
        }]
      }]
    }]
  }];
}]);