Create a scope variable by calling an asynchronous factory function

I run a factory in my code to fetch data from an API and store the results in a variable. However, every time I try to access the variable, it returns as undefined. Is there a way to pass the results of an async call to a variable? In my scenario, the structure of my factory is as follows.

angular.module('MyApp.services', [])
.factory('ReportService', ['$http', '$window', '$upload', 'AuthService', function ($http, $window, $upload, AuthService) {
    return {
        findAll: function (criteria) {
            criteria = criteria || [];

            return $http.get(BASE_URL + '/ajax.php?action=reports.all&' + criteria.join('&'));
        }        
    }
}])

Then, in the controller section

.controller('MyViewController', [
    '$scope', 'ReportService', 'toaster', '$modal', '$rootScope',
    function ($scope, ReportService, toaster, $modal, $rootScope) {
        ReportService
            .findAll()
            .then(
            function success(response, status, headers, config) {
                $scope.reports = response.data.reports;
            },
            function error(response, status, headers, config) {
                console.log('error');
            });
    //console.log($scope.reports) returns undefined here.
    }
]);

Is there any method to ensure that the variable is populated at the global level for the controller?

Answer №1

If you're scratching your head wondering why your variable appears to be undefined when you try to display it with console.log($scope.reports), the culprit is most likely asynchronous code at play. In these situations, it's common for the execution of console.log($scope.reports) to occur before the HTTP request has completed and actually assigned data to $scope.reports.

To break it down chronologically:

  1. You initiate the ReportService.findAll() function.
  2. You attempt to log $scope.reports to the console.
  3. [A bit later] The promise from ReportService.findAll() resolves, triggering your success callback which then assigns
    $scope.reports = response.data.reports;
    .

In essence, what this means is that at the time of step 2, your variable hasn't been defined yet. So while $scope.reports does get populated in your controller at some point, it's just not instantly available for logging with console.log($scope.reports).

Answer №2

At the moment your service sends back the response, console.log($scope.reports) is already running. This results in an output of undefined

Make sure to place your console statement within .then(function success(){

By doing this, it will no longer be undefined and will display the reports

Controller

.controller('MyViewController', [
'$scope', 'ReportService', 'toaster', '$modal', '$rootScope',
function ($scope, ReportService, toaster, $modal, $rootScope) {
    ReportService
        .findAll()
        .then(
        function success(response, status, headers, config) {
            $scope.reports = response.data.reports;
           console.log($scope.reports) // insert here // #2 won't be undefined.
        },
        function error(response, status, headers, config) {
            console.log('error');
        });
      //console.log($scope.reports) returns undefined here. //#2 remove from here
}
]);

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