AngularJS view does not wait for the completion of $http.get request

Within my controller, the code snippet below is present...

$scope.products = dataService.getJsonData();
console.log($scope.products);

The corresponding code in my dataservice is as follows:

.service('dataService', function ($http) {

        this.getJsonData = function () {
            return $http.get('path/to/json/products.json').then(function (response) {

                // Extract necessary data only
                var productData = response.data;
                console.log(productData);
                return productData;

            });

        };

Lastly, the code in my view looks like this:

<div ng-repeat="product in products">

    Name: {{ product.name }} <br>
    Price: {{ product.price }}
    <hr>
</div>

Upon rendering the view, I noticed that only 3 items are displayed out of a total of 15 objects in the 'products' array. Surprisingly, when inspecting the console, the log for 'products' appears to be

Object { then=function(), catch=function(), finally=function()}
, while the console output from the dataservice displays the expected object array. This asynchronous behavior is confusing me. How can I make the view wait for the dataservice without resorting to using a $timeout? Has anyone encountered similar issues before? Thank you for your help.

UPDATE *

After some research online, it seems like adding a resolve block to my $routeProvider might solve the issue. The current configuration for $routeProvider is as follows:

.when('/', {
      templateUrl: 'views/main.html',
      controller: 'MainCtrl',
      resolve:{
        // Placeholder for required action...
      }
  })

Answer №1

Whenever you invoke dataService.getJsonData(), it won't immediately return the data obtained from $http.get. Instead, it returns a promise that will eventually resolve with the data. I suggest familiarizing yourself with promises. You can find information on the Angular implementation here.

As previously mentioned, the function returns a promise that needs to be resolved before setting the data in the scope. Update your controller like so:

dataService.getJsonData().then(function (products) {
    $scope.products = products
})

Answer №2

Perhaps this suggestion may be beneficial, although Angular operates asynchronously. Consider implementing the following code snippet in your controller prior to accessing the data:

dataService.getJsonData().success(function (response){
  $scope.products = response
})

Answer №3

If you're using $resource, the process becomes simpler. Take a look at this example:

dataService.factory('getJsonData', ['$resource',
  function($resource) {
    return $resource('path/to/json/products.json');
  }
]);

Everything else remains unchanged.

Answer №4

To ensure the update takes place within a callback, you must encapsulate it in $apply. In the case of a service, utilizing $rootScope is necessary.

.service('dataService', function ($http,$rootScope) {

    this.getJsonData = function () {

        return $http.get('path/to/json/products.json').then(function (response) {
            $rootScope.$apply(function () {
                // retrieve and display only relevant data
                var productData = response.data;
                console.log(productData);
                return productData;

            })
        });     
    };

Referencing the angular promises documentation

// because this function runs asynchronously in a future iteration of the event loop, it's important to wrap our code within an $apply call to ensure proper observation of model changes.

Edit: As OdeToCode mentioned, this step may not be necessary after all. This is due to http.get returning an Angular promise, which already includes an internal $apply within the .then() callbacks.

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