Edit in JSFiddle

angular.module('myApp', [])
    .controller('ParentCtrl', ['$scope', function($scope) {<br />
        $scope.message = "Child updated from parent controller";

        $scope.clickFunction = function() {
            $scope.$broadcast('update_parent_controller', $scope.message);
        };
    }
    ])
    .controller('ChildCtrl', ['$scope', function($scope) {
        $scope.message = "Some text in child controller";
       $scope.$on("update_parent_controller", function(event, message) {
            $scope.message = message;
        });
    }
]);