Question

I try to use a http.get promise in an angularjs service, do some manipulation on the obtained collection and finally return it to a controller...

My question is how to use a $http.get() in a service in order to obtain and manipulate the result before returning it to the controller, like in the code bellow : The PEN code

var app = angular.module('myApp', []);

app.controller('customersCtrl', ['$scope','customer',function($scope, customer) {
  $scope.odds = customer.odds;
}]);

app.factory('customer', ['$http', function($http) {
  var all = [{'Id':88, 'Name':"A"}, {'Id':89, 'Name':"ShoutNotBeHere"}]; 
  var odds = [];

  $http.get("http://www.w3schools.com/angular/customers.php")
    .then(function(response) {
      all = response.records;
    });

  angular.forEach(all, function(c, i) {
    if (i % 2 == 1) {
      odds.push(c);
    }
  });

  return {odds: odds};
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<body>
  <div ng-app="myApp" ng-controller="customersCtrl">
    Odd ids from www.w3schools.com/angular/customers.php
    <ul>
      <li ng-repeat="c in odds">
        {{ c.Id + ', ' + c.Name }}
      </li>
    </ul>
  </div>
</body>

Answer 1

Basically you could modified the data inside the ajax success call & then return that data from the success. But for returning data from ajax success you need to use promise pattern to return out data from $http.get. you need to return the object from the $http.get promise, & inside .then function of $http.get you could manipulate data.

Factory

app.factory('customer', ['$http', function($http) {
    var all, odds = [];
    var getData = function() {
        return $http.get("http://www.w3schools.com/angular/customers.php")
        .then(function(response) {
          all = response.records;
          angular.forEach(all, function(c, i) {
            if (i % 2 == 1) {
              odds.push(c);
            }
          });
          return odds
        });
    }
    return {
        getData: getData 
    };
}]);

Controller

app.controller('customersCtrl', ['$scope','customer',function($scope, customer) {
    customer.getData().then(function(response){
         $scope.odds = response;
    });
}]);

Answer 2

I took the liberty to modify your code to return a promise from the factory, so you can set the value as soon as the promise is resolved.

var app = angular.module('myApp', []);

app.controller('customersCtrl', ['$scope','customer',function($scope, customer) {
  customer.then(function(data){
    $scope.odds = data.odds;
    customer.then(function(data){
      console.log(data);
    });
  });
}]);

app.factory('customer', ['$http', function($http) {
  var all = [{'Id':88, 'Name':"A"}, {'Id':89, 'Name':"ShoutNotBeHere"}]; 
  var odds = [];
  return $http.get("http://www.w3schools.com/angular/customers.php")
    .then(function(response) {
      all = response.data.records;
      angular.forEach(all, function(c, i) {
      if (i % 2 == 1) {
        c.Id = i;
        odds.push(c);
      }
    });
    return {odds: odds};
  });
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<body>
  <div ng-app="myApp" ng-controller="customersCtrl">
    Odd ids from www.w3schools.com/angular/customers.php
    <ul>
      <li ng-repeat="c in odds">
        {{ c.Id + ', ' + c.Name }}
      </li>
    </ul>
  </div>
</body>

use $http.get in a service/factory to return a collection

2 个答案: