The problem:

When I was using $http service to get data from a remote API, my code below was not able to return data back to the controller.

myApp.factory('myFactory', function($http){ 
var data = { anArray:[] };
  $http.get('/api').success(function(data) { 
data.anArray.push(data);
});
  return data; 
});

This is because the return data is already executed before the $http get request finish pushing data into the array.

My solution:

In order to handle data asynchronously, the controller needs to tell the service what to do when the data is received later:

myApp.factory('myFactory', function($http){ 
return {
getData: function(){
return $http.get('/api');
} };
});
myApp.controller('MyController', ['$scope', 'myFactory', function($scope, myFactory) { 
$scope.data = [];
  var handleSuccess = function(data, status){ 
$scope.data = data;
};
  myFactory.getData().success(handleSuccess); 
}

Let me know if you have any questions ☺


Originally published at victorleungtw.com on December 27, 2014.