app
        .directive('ngMiddleClick', function ($parse) {
            return function (scope, element, attrs) {
                var fn = $parse(attrs.ngMiddleClick);
                element.bind('click', function (event) {
                    if (event.which == 2) {
                        scope.$apply(function () {
                            event.preventDefault();
                            fn(scope, {$event: event});
                        });
                    }
                });
            };
        });