Unable to send data to another controller AngularJS - angularjs

Question

UPDATE PLEASE HELP:
Tried what you suggested, the problem is when i try to pass the value to another "Module". Tried creating a service but the function didn't work, maybe i missed something.
Made Example Using rootScope:
var informes = angular.module('informes', ['angular-drupal', 'ui.bootstrap']);
informes.controller('InformesCtrl', ['drupal', '$rootScope', '$scope', '$http', 'InformesFtry', function(drupal, $rootScope, $scope, $http, InformesFtry) {
$rootScope.nodeID = function(item){
var item = "hi";
console.log(item);
}
}]);
Console hi
It works in first module, but...
In my other Module with different Page...
var nodeInformes = angular.module('node-informes', ['informes']);
nodeInformes.controller('NodeInformesCtrl', ['drupal', '$rootScope', '$scope', '$http', 'InformesFtry', function(drupal, $rootScope, $scope, $http, InformesFtry) {
$scope.nodeID2 = $rootScope.nodeID(item);
console.log($scope.nodeID2);
}]);
Console: item is Undefined
I'm trying to figure out of how can i pass a function to another module, but it seems that it is impossible. I didn't try to use same module, but it works if the controller is child from the first controller.
I really apprecaite any help you can provide me to pass a function with parameter to another module with another controller. I'm trying to learn with this. Thanks!!!
EDIT: If i add the firstcontroller as a dependency it gives me Unknown Provider... Sorry for my mistake.

Answer 1

In Angular JS there are three ways for controllers to communicate with other controllers, and any other method is asking for trouble:
Use a service:
Use a service as an intermediary between controllers:
function MyService() {
this.MyObject = {};
}
function ctrl1(MyService) {
Myservice.MyObject = {
someData: "someValue"
};
}
function ctrl2(MyService) {
$scope.someValue = MyService.MyObject.someData;
}
Use the event system
function ctrl1($rootScope) {
$rootScope.$broadcast("my-event", {someData: "someValue"});
}
function ctrl2($scope) {
$scope.$on("my-event", function(event, params) {
$scope.someData = params.someData;
});
}
Scope inheritence
<div ng-controller="ctrl1">
<div ng-controller="ctrl2">
</div>
</div>
function ctrl1($scope) {
$scope.someData = "someValue";
}
function ctrl2($scope) {
console.log($scope.$parent.someData); //"someValue"
}