Issues with the functionality of Angular Factory

Issues are arising with the controller not retrieving data correctly from the factory to display in the view. When all the data was stored in the controller, it worked fine. However, upon transferring it to the factory, the data no longer showed on the view. It seems like there might be a problem either with how the controller is calling the factory data or how the factory itself is defined, but it's unclear which one is causing the issue.

Controller:

app.controller('dbCtrl', ['$scope', 'myfactory', function($scope, myfactory) {
 myfactory.success(function(data) {

$scope.test1 = results[0].data;
$scope.test2 = results[1].data;
$scope.test3 = results[2].data;

});
}]);

Factory:

app.factory('myfactory', ['$http', function($http, $q) { 

$q.all([
$http.get('/url1'),
$http.get('/url2'),
$http.get('/url3')   
]).then(function(data) { 
          return data; 
        }) 

 }]);

Answer №1

Your code syntax for creating and accessing the factory is incorrect. Make sure to refer to the Angular documentation for guidance.

To address your issue, I have prepared an example that matches yours: http://plnkr.co/edit/TJObJN?p=preview

myfactory.getResult().then(function(results) {
....  
}   
 app.factory('myfactory', ['$http', '$q', function($http, $q) {

  var _getResult = function() {

    // Returns a promise that depends on all 3 HTTP responses.
    // Parallel AJAX request.
    return $q.all([ 
      $http.get('/url1'),
      $http.get('/url2'),
      $http.get('/url3')
    ]);

  };

  // Public functions available in the controller 
  return {
    getResult: _getResult
  };

  ///////////////////
}]);

A few notes:

  1. The Angular factory you create should return an Object containing functions or properties.
  2. Ensure you include all dependencies in the array as well as in the function arguments.
  3. $q promise only has `then`, while $http promise provides `success(...)` callback. Refer to the syntax and examples here.

Answer №2

function createMyFactory($http, $q) { 
    return {
        getAllData: $q.all([
            $http.get('/urlA'),
            $http.get('/urlB'),
            $http.get('/urlC')   
        ]).
        then(function(response) { 
            return response; 
        });
    };
}

app.factory('myNewFactory', ['$http', '$q', createMyFactory]);

Then in the controller:

myNewFactory.getAllData().then( ...

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