如何在Angular JS的控制器中访问JSON的子元素

Question

I don't understand how to wait for the resource call to finish before assigning the data.properties to $scope in my controller.

here is my confusion:

i have a resource call that returns this:

[
{
    "PreAlertInventory": "5.000000",
    "SharesInInventory": "3.000000",
    "TotalSharesSold": "2.000000",
    "TotalMoneySharesSold": "18.000000",
    "TotalSharesBought": "0.000000",
    "TotalShareCost": "0.000000",
    "EstimatedLosses": "0.000000"
}
]

here is the applicable code from the controller:

$scope.alertSwap = function () {

  var data = Data.query(); // gets the data. works as expected

  //$scope.test = data; //works as expected. can access data and properties in template
  $scope.test = data.TotalMoneySharesSold; //does not work. is empty???
}

i can access the array and its properties from the template BUT not from inside the controller.

How do I access the child elements from inside the controller that called the resource?

http://plnkr.co/edit/JnLqq4v7lKlYOHg85Jma?p=preview

answer: thanks to all who helped:

I needed to assign a callback to the resource call, and assign the elements from within the function:

$scope.data = Data.query(myParams, function(data) {
  $scope.test = data[0].TotalSharesBought;
});

Answer 1

Your data would appear to be returned as an array, try $scope.testTwo = data[0].TotalSharesBought .

I've updated your Plunkr accordingly.

Answer 2

As said above it is likely you are fetching those data async. I updated your code to support promise (which makes your code async and may not fit with the rest of the application by the way).

$timeout simulates an async call. In your factory service :

var deferred = $q.defer();
$timeout(function() {
    return deferred.resolve(data);
}, 100); // set it to zero to return immediately
return deferred.promise;

In your controller call you factory factory method query() and hook the response with then , which is the promise part of the snippet:

Data.query().then(function(response) {
  $scope.test = response[0].TotalMoneySharesSold;
});

http://plnkr.co/edit/SGGCVS?p=preview