Modal with directives requiring outer controller

<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.0/angular.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.13.0/ui-bootstrap.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.13.0/ui-bootstrap-tpls.js"></script>
    <script src="script.js"></script>
  </head>

  <body>
    <div ng-app="app">
      <div ng-controller="AppCtrl as ctrl">
        <outer>
          <popup-on-click>

            <div class="modal-header">
                <h3 class="modal-title">title</h3>
            </div>
            <div class="modal-body">
              <inner>
                content
              </inner>
            </div>
            <div class="modal-footer">
              footer
            </div>
          </popup-on-click>
          
        </outer>
        
        
      </div>
    </div>
    
  </body>

</html>

// Code goes here

(function (ng, undefined){
    'use strict';
    var NG_HIDE_CLASS = 'ng-hide';

    var module = ng.module('test', []);
    
    module
      .directive('outer', [function() {
        function ctrl() {
          this.outerFunctionality = function() {
            alert('context call');
          };
        }
        function link(scope, element, attr) {
        }
        return {
          restrict: 'E',
          controller: ctrl,
          link: link
        };
      }])
      .directive('inner', [function() {
        function link(scope, element, attr, outerCtrl) {
          scope.ok = function() {
            if (!outerCtrl) {
              alert('what happend to my outer ctrl?');
            } else {
              outerCtrl.outerFunctionality();
            }
          };
        }
        return {
          restrict: 'E',
          require: '^?outer',
          link: link,
          template: '<button ng-click="ok()" class="btn btn-primary">ok</button> <button ng-click="cancel()" class="btn btn-secondary">cancel</button>'
        };
      }])
      .directive('popupOnClick', ['$modal', function($modal) {
        function srModalInstanceCtrl($scope, $modalInstance) {
          $scope.ok = function () {
              $modalInstance.close($scope.row);
          };
          $scope.cancel = function () {
              $modalInstance.dismiss('cancel');
          };
        }
        
        function link(scope, element, attr, ctrl, transcludeFn) {
          var popupChild = element.find('div');
          var template = popupChild.html();
          popupChild.addClass(NG_HIDE_CLASS);

          scope.openPopup = function() {
            var modalInstance = $modal.open({
                animation: true,
                template: template,
                //futureParentEl: element,
                controller: srModalInstanceCtrl,
                size: 'lg',
                scope: scope
            });

            modalInstance.result.then(function () {
              //action on close ok
            }, function () {
              //action on cancel
            });
          };
        }
        return {
          restrict: 'E',
          scope: true,
          transclude: true,
          link: link,
          template: '<button ng-click="openPopup()" class="btn btn-primary">Open Popup</button><div ng-transclude></div>'
        };
      }]);


    ng.module('app', ['ui.bootstrap', 'test']);

    ng.module('app')
      .controller('AppCtrl', [function () {
      }]);
  
})(angular);

/* Styles go here */