javascript 在服务/工厂中使用 $http.get 返回集合
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use $http.get in a service/factory to return a collection
提问by Serge
I try to use a http.getpromise in an angularjs service, do some manipulation on the obtained collection and finally return it to a controller...
我尝试http.get在 angularjs 服务中使用承诺，对获得的集合进行一些操作，最后将其返回给控制器......
My question is how to use a $http.get()in a service in order to obtain and manipulate the result beforereturning it to the controller, like in the code bellow :
The PEN code
我的问题是如何$http.get()在服务中使用 a以便在将结果返回给控制器之前获取和操作结果，就像下面的代码一样：
PEN 代码
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>回答by Pankaj Parkar
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.getpromise, & inside .thenfunction of $http.getyou could manipulate data.
基本上，您可以修改 ajax 成功调用中的数据，然后从成功中返回该数据。但是要从 ajax 成功返回数据，您需要使用承诺模式从$http.get. 您需要从$http.get承诺中返回对象，并且您的内部.then函数$http.get可以操作数据。
Factory
工厂
app.factory('customer', ['$http', function($http) {
var all, odds = [];
var getData = function() {
return $http.get("http://www.w3schools.com/angular/customers.php")
.then(function(response) {
all = response.records;
angular.forEach(all, function(c, i) {
if (i % 2 == 1) {
odds.push(c);
}
});
return odds
});
}
return {
getData: getData
};
}]);
Controller
控制器
app.controller('customersCtrl', ['$scope','customer',function($scope, customer) {
customer.getData().then(function(response){
$scope.odds = response;
});
}]);
回答by Constantine Poltyrev
I took the liberty to modify your code to return a promise from the factory, so you can set the value as soon as the promise is resolved.
我冒昧地修改了您的代码以从工厂返回承诺，因此您可以在承诺解决后立即设置该值。
var app = angular.module('myApp', []);
app.controller('customersCtrl', ['$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>