Sharing data between AngularJS controllers?

Question

How do I store the items I've selected in a checkbox with other controllers?

My attempt (see the plnkr for views):

script.js (controllers)

var myApp = angular.module('myApp', []);

myApp.factory('CooSelection', function () {
  return {selectedCoo: []}
})

function CooListCtrl($scope, CooSelection) {
  $scope.coos = {"Coos": ["spark", "nark", "hark", "quark"]};

  $scope.coo_list_selection = CooSelection;

  $scope.checkSelection = function (item) {
    if ($scope.coo_list_selection.indexOf(item) === -1) {
      $scope.coo_list_selection.push(item);
    } else {
      $scope.coo_list_selection.splice($scope.coo_list_selection.lastIndexOf(item), 1);
    }
  }
}

CooListCtrl.$inject = ['$scope', 'CooSelection'];

function DebugCooList($scope, CooSelection) {
  $scope.coo_selection = CooSelection;
}

DebugCooList.$inject = ['$scope', 'CooSelection'];

Answer 1

When you reference the CooSelection service, you are expecting an array, but the factory returns an object. You could do this instead:

myApp.factory('CooSelection', function () {
    return [];    // Return an array instead of an object.
})

Also, in your DebugCooList controller, your scope property does not match the name of the variable you are checking in the view. The controller code assigns to coo_selection but the view checks coo_list_selection, so you'll need to change one to match the other.