CODEWITHSUNDEEP
angularjscachefactory
RoyBarOn
RoyBarOn

Reputation: 987

How to retrieve data from AngularJS CacheFactory to the controller?

I'm struggling working with $cacheFactory, i'm trying to cache a simple GET request and then retrieve it from the controller - but i don't understand how can i do it.

Here is the Service

        app.service('usersService', function ($http, $cacheFactory, $q) {

            var cache = $cacheFactory("todoList");
            this.getToDos = function() {
                var deferred = $q.defer();
                var req = {
                method: 'GET',
                url:'https://jsonplaceholder.typicode.com/todos',

                cache: true
                };

                var data = cache.get("todoList");
                if (!data) {
                $http(req).then(function(payload) {
                    deferred.resolve(payload.data);
                    cache.put("todoList", payload.data);
                }, function(reason) {
                    deferred.reject(reason);
                });
                } else {
                return data;
                }
                return deferred.promise;
            };

        })

And here is the controller 

        app.controller('usersListController', function ($scope, usersService, BookService,  $cacheFactory) {

            function init() {

                $scope.refresh();
                usersService.getToDos();
                var sharedCache = $cacheFactory.get('todoList'); // getting undefined
                console.log(sharedCache);
            }

            init();

        });

I guess the problem is that the GET request is asynchronous - so by the time the controller executes the init function - the GET doesn't "get" anything .....

Upvotes: 0

Views: 35

Answers (2)

NTP
NTP

Reputation: 4448

Your guess is correct, since request is asynchronous by the time

var sharedCache = $cacheFactory.get('todoList');

is running, your todoList may or may not be set. What you can do is to return a promise from your service. 

this.getToDos = function() {
            var req = {
                method: 'GET',
                url:'https://jsonplaceholder.typicode.com/todos',
                cache: true
            };
            return req;
        };

and resolve your promise inside your controller.

var promise = usersService.getToDos();
promise.then(function (recieved) {

},
function (error) {

});

Upvotes: 0

devis makvana
devis makvana

Reputation: 11

Try to replace this one

var sharedCache = $cacheFactory.get('todoList');

to

var cache = $cacheFactory('todoList'); cache.get();

Note- Refer this link https://docs.angularjs.org/api/ng/service/$cacheFactory

Syntax - $cacheFactory(Key); //get data

Upvotes: 0

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