Develop Reference

Get an element by id with Angular service

I have a service to get (with array) all post from a server. I need to filter this array by id and show only this post in a single page.
In the service I have this code.
.service('PostAPI', function($http) {
this.getAll = function() {
return $http.get("ajax/getAllPosts.php");
}
this.getOne = function(data) {
return $http.get("ajax/searchPost.php?postID=" + data);
}
this.delete = function(data) {
if (confirm("Are you sure to delete this line?")) {
return $http.delete("ajax/deletePost.php?postID=" + data);
}
}
this.update = function(data) {
return $http.put("ajax/updatePost.php?postID" + data);
}
this.create = function() {
return $http.post("ajax/addPost.php");
}
})
In the controller
.controller("PostControlador", function($scope, $routeParams, PostAPI) {
GetPost();
$scope.title = "Editar post";
function GetPost() {
PostAPI.getOne($routeParams.id).success(function(data) {
$scope.post = data;
console.log($scope.post);
});
};
In post HTML I have this.
<div>
<div>{{post.TASK}}</div>
<div>{{post.STATUS}}</div>
<b>Back</b>
</div>
I'm not able to get any data to show in the page, and also, i have no errors in my console. ¿Any idea?

Check your ajax/searchPost.php?postID= api that is this api returning single object or array, If this api returning object than it should work but If you getting array of single element in response of api then in your api success code use first element of array by data[0].
Controller code
.controller("PostControlador", function($scope, $routeParams, PostAPI) {
GetPost();
$scope.title = "Editar post";
function GetPost() {
PostAPI.getOne($routeParams.id).success(function(data) {
$scope.post = data[0];
console.log($scope.post);
});
};

use then instaed of success. .then returns a promise so that you can handle the asynchrounous calls.
Also you are calling the getPost() method before function definition. So it may not get the promise.
call your getPost(), method after the function definition and check, so that it can receive the promise.
.controller("PostControlador", function($scope, $routeParams, PostAPI) {
$scope.title = "Editar post";
function GetPost() {
PostAPI.getOne($routeParams.id).then(function(data) {
$scope.post = data[0];
console.log($scope.post);
});
};
GetPost();

Angular Service working synchronously with Controller

I'm fairly new to AngularJS and have just begun to grasp many of the concepts I especially like the MVC design pattern. But I am having a difficult time implementing the Service layer in my application.
What I am finding is that after my Controller calls a method within the service, it continues with code execution before the service returns the data; so that by the time the service does return the data, it isn't of any use to the controller.
To give a better example of what I'm saying, here is the code:
var InsightApp = angular.module('InsightApp', ['chart.js']);
// Module declaration with factory containing the service
InsightApp.factory("DataService", function ($http) {
return {
GetChartSelections: function () {
return $http.get('Home/GetSalesData')
.then(function (result) {
return result.data;
});
}
};
});
InsightApp.controller("ChartSelectionController", GetAvailableCharts);
// 2nd Controller calls the Service
InsightApp.controller("DataController", function($scope, $http, DataService){
var response = DataService.GetChartSelections();
// This method is executed before the service returns the data
function workWithData(response){
// Do Something with Data
}
}
All the examples I've found seem to be constructed as I have here or some slight variation; so I am not certain what I should be doing to ensure asynchronous execution.
In the Javascript world, I'd move the service to the inside of the Controller to make certain it executes async; but I don't how to make that happen in Angular. Also, it would be counter intuitive against the angular injection to do that anyway.
So what is the proper way to do this?

http return a promise not the data, so in your factory your returning the $http promise and can use it like a promise with then, catch, finally method.
see: http://blog.ninja-squad.com/2015/05/28/angularjs-promises/
InsightApp.controller("DataController", function($scope, $http, DataService){
var response = DataService.GetChartSelections()
.then(function(res) {
// execute when you have the data
})
.catch(function(err) {
// execute if you have an error in your http call
});
EDIT pass params to model service:
InsightApp.factory("DataService", function ($http) {
return {
GetChartSelections: function (yourParameter) {
console.log(yourParameter);
return $http.get('Home/GetSalesData')
.then(function (result) {
return result.data;
});
}
};
});
and then :
InsightApp.controller("DataController", function($scope, $http, DataService){
var response = DataService.GetChartSelections('only pie one')
.then(function(res) {
// execute when you have the data
})
.catch(function(err) {
// execute if you have an error in your http call
});

You should proceed like this :
DataService.GetChartSelections().then(function (data) {
workWithData(data);
}
Actually $http.get returns a Promise. You can call the method then to handle the success or failure of your Promise

Should it not be like this, when your $http returns a promise or you pass a callback.
With passing callback as a param.
InsightApp.factory("DataService", function ($http) {
return {
GetChartSelections: function (workWithData) {
return $http.get('Home/GetSalesData')
.then(function (result) {
workWithData(result.data);
});
}
};
});
Controller code:
InsightApp.controller("DataController", function($scope, $http, DataService){
var response = DataService.GetChartSelections(workWithData);
// This method is executed before the service returns the data
function workWithData(response){
// Do Something with Data
}
}
Or use then or success:
var response = DataService.GetChartSelections().then(function(res){
//you have your response here... which you can pass to workWithData
});

Return the promise to the controller, dont resolve it in the factory
var InsightApp = angular.module('InsightApp', ['chart.js']);
// Module declaration with factory containing the service
InsightApp.factory("DataService", function ($http) {
return {
GetChartSelections: function () {
return $http.get('Home/GetSalesData');
}
};
});
In the controller,
var successCallBk =function (response){
// Do Something with Data
};
var errorCallBK =function (response){
// Error Module
};
var response = DataService.GetChartSelections().then(successCallBk,errorCallBK);

Passing $scope variable from Controller to Service

Currently writing a prototype app in Ionic, pretty new to ionic and angular. I've written a small JSON API with about 25 objects in it, I've been able to display the list of them on a page we'll call "Library", I'm trying now to use those list items as links to an individual page for each item we will call a "Lesson". The variable $scope.lessonId is being set properly in the controller but being set as undefined in the service. Is it possible to achieve what I'm trying to, or am I just flat out doing this wrong?
.controller('LibraryLessonCtrl', function($scope, $stateParams, LessonService) {
$scope.lessonId = $stateParams.libraryId;
console.log($scope.lessonId);
LessonService.getLessonId()
.then(function(response){
$scope.lesson = response;
console.log($scope.lesson);
});
})
.service ('LessonService', function($http){
return { getLessonId: function() {
return $http.get('api/postsAPI.json')
.then(function (response, lessonId) {
console.log(lessonId);
for(i=0;i<response.data.length;i++){
if(response.data[i].post_id == lessonId){
return response.data[i];
}
}
});
}
};
})

You have to pass your $scope.lessonId variable to your service call if you like to use the value inside your service.
.controller('LibraryLessonCtrl', function($scope, $stateParams, LessonService) {
$scope.lessonId = $stateParams.libraryId;
console.log($scope.lessonId);
LessonService.getLessonId($scope.lessonId)
.then(function(response){
$scope.lesson = response;
console.log($scope.lesson);
});
}).service ('LessonService', function($http){
return { getLessonId: function(lessonId) {
return $http.get('api/postsAPI.json')
.then(function (response) {
console.log(lessonId);
for(i=0;i<response.data.length;i++){
if(response.data[i].post_id == lessonId){
return response.data[i];
}
}
});
}
};
})

You could do it by passing Id to service and storing it there. Please try not to pass $scope variable to service as it is not a good practice. You can do following:
.service ('LessonService', function($http){
var lessionId;
return {
/*other methods*/
setLessionId: function(id) {
lessionId = id;
},
getLessionId: function(){
return lessionId;
}
};
})

Using $http in Angular Service - Cannot read property 'post' of undefined

I'm trying to learn how to use Angular right, by having all my business logic in services.
When I do a post request in a service, I get the following error:
Cannot read property 'post' of undefined
Here is some code:
UrlApp.controller('UrlFormCtrl', UrlFormCtrl);
UrlApp.factory('addUrlService', addUrlService);
function UrlFormCtrl($scope, $http) {
console.log('Url Form Controller Initialized');
$scope.addUrl = addUrlService.bind(null, $http);
}
function addUrlService($scope, $http){
console.log('initializing addUrlService');
return $http.post('urls/create', {'test':'test'}).then(function(response){
return response.data;
});
}
I'm just getting the hang of Angular, so I'm not entirely sure what I'm doing wrong. See any problems?

Firstly, you don't need to inject $scope in your service.
Secondly, you don't need to inject $http service in your controller.
Thirdly, you need to inject the service in your controller.
Finally, addUrlService service is returning a promise meaning it will make a request when service is instantiated. You may want to return a function instead or an object containing several functions.
So I would change your code to:
UrlApp.controller('UrlFormCtrl', UrlFormCtrl);
UrlApp.factory('AddUrlService', AddUrlService);
function UrlFormCtrl($scope, AddUrlService) {
$scope.addUrl = AddUrlService.addUrl;
}
function AddUrlService($http) {
function addUrl() {
return $http.post('urls/create', {
'test': 'test'
}).then(function (response) {
return response.data;
});
}
return {
addUrl: addUrl
};
}

Can you try like this
UrlApp.controller('UrlFormCtrl', UrlFormCtrl);
UrlApp.factory('addUrlService', addUrlService);
function UrlFormCtrl($scope,addUrlService) {
console.log('Url Form Controller Initialized');
$scope.addUrl = addUrlService;
}
function addUrlService($http){
console.log('initializing addUrlService');
return $http.post('urls/create', {'test':'test'}).then(function(response){
return response.data;
});
}

How should I set data from an asynchronous service into a controller $scope?

All server data accesses in my page are performed by my RequestFactory provider.
(The RequestFactory uses $http to perform the actual server calls.)
My controller scope has a reference to the list of data returned from the RequestFactory.
My question is that since the RequestFactory calls are asynchronous, and the RequestFactory does not (and should not) have access to the controller scope, what is the proper way for the RequestFactory to hand off the data to the controller?
var requestFactory = {};
angular.module("myApp").factory("RequestFactory", function($http) {
requestFactory.fetch = function() {
$http.get(url).
success(function(data) {
controller.setData(data)
}).
error(function(data, status) {
console.info("fetch Failed. Error code: " + status + " Url:" + url);
}).finally(function() {
controller.setSubmitting(false);
});
};
return requestFactory;
});

You should return the promise from you factory. See below snippet.
.factory("RequestFactory", function($http) {
return {
fetch : function() {
return $http.get(url).then(function(result) {
return result.data;
});
}
}
});
In your controller you should use like
.controller('MainCtrl', function($scope, RequestFactory) {
RequestFactory.fetch().then(function(data)
$scope.foo = data;
});
});

You can do the following :
Service
(function(){
function Service($http){
function get(){
//We return a promise
return $http.get('path_to_url');
}
var factory = {
get: get
};
return factory;
}
angular
.module('app')
.factory('Request', Service);
})();
Controller
(function(){
function Controller($scope, $q, Request) {
var defer = $q.defer();
//Call our get method from the Request Factory
Request.get().then(function(response){
//When we get the response, resolve the data
defer.resolve(response.data);
});
//When the data is set, we can resolve the promise
defer.promise.then(function(data){
console.log(data);
});
}
angular
.module('app', [])
.controller('ctrl', Controller);
})();
As you know, $http service return promise, so after that, you can easily combining them.