Error: Custom Service is behaving unpredictably

My latest project involves creating a customized service. While the service function is returning data as expected, I encounter an issue when calling it in the controller - it returns 'undefined'.

Service:

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

    toDoListServices.factory('DataTasksService', function($http){
        return {
            getTasks: function(){
                $http.get('js/data.json').success(function(data){
                    return data;
                })

            }
        }
    });

Controllers:

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

toDoListController.controller('ListController', ['$scope', 'DataTasksService', function($scope, DataTasksService){
        $scope.tasks = DataTasksService.getTasks();

}]);

App.js:

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

Answer №1

getTasks function does not have a return statement by default. Adding a return inside the success callback will not make it work as expected.

To solve this issue, you should return the $http promise directly from the getTasks method.

Here's an updated version of the code:

toDoListServices.factory('DataTasksService', function($http){
    return {
        getTasks: function(){
            // Return the $http promise
            return $http.get('js/data.json');               

        }
    }
});

In your controller, handle the promise like this:

DataTasksService.getTasks().then(function(response){
    $scope.tasks = response.data;
});

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