Question

My App has several views,each view has a controller.

I have several API resources returning standard JSON arrays.Whenever a view changes,the resources are re-queried for new data which is fairly slow. I’d prefer to provide my controllers with the API resources without requerying each time.

Whats the best way to do this?

Answer 1

If I understand correctly then this is what services are for. They’re kind of like a central place for controllers share data.

I looked over the jsfiddle for the code used in this tutorial:

http://onehungrymind.com/angularjs-communicating-between-controllers/

var myModule = angular.module('myModule', []);
myModule.factory('mySharedService', function($rootScope) {
    var sharedService = {};

    sharedService.message = '';

    sharedService.prepForBroadcast = function(msg) {
        this.message = msg;
        this.broadcastItem();
    };

    sharedService.broadcastItem = function() {
        $rootScope.$broadcast('handleBroadcast');
    };

    return sharedService;
});

function ControllerZero($scope, sharedService) {
    $scope.handleClick = function(msg) {
        sharedService.prepForBroadcast(msg);
    };

    $scope.$on('handleBroadcast', function() {
        $scope.message = sharedService.message;
    });        
}

function ControllerOne($scope, sharedService) {
    $scope.$on('handleBroadcast', function() {
        $scope.message = 'ONE: ' + sharedService.message;
    });        
}

function ControllerTwo($scope, sharedService) {
    $scope.$on('handleBroadcast', function() {
        $scope.message = 'TWO: ' + sharedService.message;
    });
}

ControllerZero.$inject = ['$scope', 'mySharedService'];        

ControllerOne.$inject = ['$scope', 'mySharedService'];

ControllerTwo.$inject = ['$scope', 'mySharedService'];​

---

EDIT

For resource calls, I have a service right now that uses them like this. Sorry that its in coffeescript

.factory('EventService', (SubEvent, User) ->
    subevents = {}

    return {
        getSubevent: (subevent_id) ->
            SubEvent.get {subevent_id: subevent_id}, (subevent) ->

                participants = (participant.user for participant in subevent.participants)
                User.query {participants: participants}, (users) ->
                    for user,i in users
                        subevent.participants[i].user = user

                    subevents[subevent_id] = subevent
    }
)