app.directive('toggle', function(){  return {    restrict: 'A',    template: 'Click Me',    replace: true,    scope: {      toggle: '&'    },    controller: function($scope) {      $scope.toggleValue = false;      $scope.f = function() {        $scope.toggleValue = !$scope.toggleValue;        $scope.toggle({message: $scope.toggleValue});      };    }  };});

You can use like this: