adding and removing classes in angularJs using ng-click

I am trying to work how to add a class with ngClick. I have uploaded up my code onto plunker Click here. Looking at the angular documentation i can't figure out the exact way it should be done. Below is a snippet of my code. Can someone guide me in the right direction

 <div ng-show="isVisible" ng-class="{'selected': $index==selectedIndex}" class="block"></div>

Controller

var app = angular.module("MyApp", []);
app.controller("subNavController", function ($scope){

        $scope.toggle = function (){
            $scope.isVisible = ! $scope.isVisible;
        };

        $scope.isVisible = false;
    });

I want to add or remove "active" class in my code dynamically on ng-click, here what I have done.

<ul ng-init="selectedTab = 'users'">
   <li ng-class="{'active':selectedTab === 'users'}" ng-click="selectedTab = 'users'"><a href="#users" >Users</a></li>
   <li ng-class="{'active':selectedTab === 'items'}" ng-click="selectedTab = 'items'"><a href="#items" >Items</a></li>
</ul>

You just need to bind a variable into the directive "ng-class" and change it from the controller. Here is an example of how to do this:

var app = angular.module("ap",[]);

app.controller("con",function($scope){
  $scope.class = "red";
  $scope.changeClass = function(){
    if ($scope.class === "red")
      $scope.class = "blue";
    else
      $scope.class = "red";
  };
});

.red{
  color:red;
}

.blue{
  color:blue;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<body ng-app="ap" ng-controller="con">
  <div ng-class="class">{{class}}</div>
  <button ng-click="changeClass()">Change Class</button>    
</body>

Here is the example working on jsFiddle

There is a simple and clean way of doing this with only directives.

<div ng-class="{'class-name': clicked}" ng-click="clicked = !clicked"></div>

you can also do that in a directive, if you want to remove the previous class and add a new class

    .directive('toggleClass', function() {
    return {
        restrict: 'A',
        link: function(scope, element, attrs) {
            element.bind('click', function() {
                if(element.attr("class") == "glyphicon glyphicon-pencil") {
                    element.removeClass("glyphicon glyphicon-pencil");
                    element.addClass(attrs.toggleClass);
                } else {
                    element.removeClass("glyphicon glyphicon-ok");
                    element.addClass("glyphicon glyphicon-pencil");
                }
            });
        }
    };
});

and in your template:

<i class="glyphicon glyphicon-pencil" toggle-class="glyphicon glyphicon-ok"></i>

adding and removing classes in angularJs using ng-click

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