Develop Reference

Angular Js Translation Partial Issue

I am binding translation.
The issue is , some object convert to translated value, while some like mentioned below didn't work. This issue happened only first time when I build project. On refresh it gets fine.
This is not happening to all html objects.
angular.module('App').factory('APILoader', ['localStorageService', '$http', '$q', function (localStorageService, $http, $q) {
var translationAPIUrl = "Translation/Get";
return function (options) {
var deferred = $q.defer();
$http.get(translationAPIUrl, { params: { id: culture } }).success(function (response) {
data = JSON.parse(response.data);
deferred.resolve(data);
}).error(function (data) {
deferred.reject(options.key);
});
return deferred.promise;
};
}]);
Html:
<b> {{('Heading' |translate)}}</b>

I got it.
The issue is with deferred,
It did not resolve properly and get return.
The Key line is:
deferred.promise.then(function () {});
Here is the fixed code:
angular.module('App').factory('APILoader', ['localStorageService', '$http', '$q', function (localStorageService, $http, $q) {
var translationAPIUrl = "Translation/Get";
return function (options) {
var deferred = $q.defer();
$http.get(translationAPIUrl, { params: { id: culture } }).success(function (response) {
data = JSON.parse(response.data);
deferred.resolve(data);
deferred.promise.then(function () {});
});
}).error(function (data) {
deferred.reject(options.key);
});
return deferred.promise;
};
}]);

How can I gain access to a Javascript variable from within a return function?

function storyData($http, $q) {
var URL = 'stories.json';
var storyCache = [];
this.getStories = function() {
var deferred = $q.defer();
alert(URL);
$http({method: 'GET', url: URL})
.success(function (data, status, headers, config) {
storyCache = data;
alert(storyCache); //correct data appears in the alert window, but this doesn't set the instance storyCache variable for some reason
deferred.resolve(data);
})
.error(function (data, status, headers, config) {
deferred.reject(status);
});
return deferred.promise;
};
this.stories = function() {
return storyCache;
}
}
My app -
'use strict';
var angularApp = angular.module('ccsApp', ['ngRoute', 'ngAnimate', 'ui.bootstrap']);
angularApp.config(['$routeProvider',
function($routeProvider) {
$routeProvider.
when('/', {
templateUrl: 'stories.html',
controller: 'StoryController as StoryCtrl',
resolve: {
stories: function(storyData) {
return storyData.getStories();
}
}
})
.otherwise({
redirectTo: '/'
});
}
]);
Within my controller, I'm not injecting the "stories" value from the routeProvider so that I can use my service.
Why am I unable to change storyCache from within my $http method? I'm confident this is something terribly simple, but my research hasn't led me to an answer. Thank you in advance for your help.
The async. aspect of this works fine and is not the problem. I'm ensuring that I have the data by using the resolve object on my routeProvider. Also, I'm ensuring that I have the data before the deferred.resolve(data) method executes by issuing an alert on it. I don't have the solution, but an error in my use of async. is not the solution either.

returning value to higher scope inside from a chained functions in angular js

I have a function getUsers that I want to return JSON from an web api .. but I cant seem to get the data out, I can't return the data because the function is inside $http. What should i do ?
function getUsers() {
$http({ method: 'GET', url: '/api/loginapi/userdetails' })
.success(function (data, status, headers, config) {
details = data;
});
return details;
}

$http makes an asynchronous call, so you can't immediately return fetched data.
What you can return is a promise. Good news, $http() returns one:
function getUsers() {
return $http({ method: 'GET', url: '/api/loginapi/userdetails' });
}
Then you can use your function:
getUsers().then(function(data) {
var details = data;
// Process your details!
});

You can access data there for sure, nothing is 'inside' $http, I suggest you pass in a callback to getUsers() and do whatever you want with the returned data:
var getUsers=function(callback){
$http({ method: 'GET', url: '/api/loginapi/userdetails' })
.success(function (data, status, headers, config) {
callback(data);
});
}
and use it like this inside your controller:
getUsers(function(users){
$scope.whatever = users;
})

I created plunkr for your question http://plnkr.co/edit/lqX4apmvnKM3i5jGZDQM?p=preview
$http return a promise. Please read details about promise at http://johnmunsch.com/2013/07/17/angularjs-services-and-promises/ . It is an important understanding if you want to write asynchronous application. This is another useful link - Inside my own Angular service, how do you get the return value back to the Controller that called the service? . Refer to answer. It explains how to use promise and deffered in angularjs.
var app = angular.module('plunker', []);
app.service('UserService', ['$http', '$q',
function($http, $q) {
this.getUser = function() {
return $http({
method: 'GET',
url: 'data.json'
});
};
}
]);
app.controller('MainCtrl', function($scope, UserService) {
$scope.user = {};
UserService.getUser().then(function(response){
$scope.user = response.data;
});
});

unable to get data from $q into scope

I'm trying to bind some data being returned from an API to my scope using promises with $q, I am able to pull the data from the server without any issue (I can see JSON being returned using fiddler) however the $scope variable remains empty, any help would be greatly appreciated! Thanks in advance.
Code:
toDoListService.js
app.factory("toDoListService", function ($http, $q) {
var deferred = $q.defer();
return {
get: function () {
$http({ method: 'GET', url: '/api/todo/' }).
success(function (data) {
deferred.resolve(data);
}).
error(function (data, status, headers, config) {
deferred.reject(status);
});
return deferred.promise;
}
});
toDoListController.js
app.controller("toDoListController", function($scope, toDoListService){
$scope.toDoList = toDoListService.get();
});

First of all you should put var deferred = $q.defer(); in your get function, so that every get has it's own deferred object.
Second what get actually returns is a promise. So you need to access you data in this way:
app.controller("toDoListController", function($scope, toDoListService){
toDoListService.get().then(function(data){
$scope.toDoList = data;
});
});

Right now, your $scope.toDoList is bound to a promise. This means of binding used to work, but was deprecated in, I think, 1.2.
As Michael suggests, you must do:
app.controller("toDoListController", function($scope, toDoListService){
toDoListService.get().then(function(data){
$scope.toDoList = data;
});
});
Also, using $q is not required here at all, as $http returns a promise anyway. Therefore, you could just do:
app.factory("toDoListService", function ($http){
return {
get: function () {
return $http({ method: 'GET', url: '/api/todo/' });
}
};
});

You can simplify your code by using this:
toDoListService.js
app.factory("toDoListService", function ($http, $q) {
return {
get: function () {
return $http({ method: 'GET', url: '/api/todo/' });
}
}
});
toDoListController.js
app.controller("toDoListController", function($scope, toDoListService) {
toDoListService.get().then(function(response){
$scope.toDoList = response.data;
return response;
});
});
Be sure to return response in your success callback, otherwise chained promises would not receive it.

AngularJS: Call a particular function before any partial page controllers

I want to call a particular function: GetSession() at the beginning of my application load. This function makes a $http call and get a session token: GlobalSessionToken from the server. This session token is then used in other controllers logic and fetch data from the server. I have call this GetSession()in main controller: MasterController in $routeChangeStart event but as its an asynchronous call, my code moves ahead to CustomerController before the $http response.
Here is my code:
var GlobalSessionToken = ''; //will get from server later
//Define an angular module for our app
var myApp = angular.module('myApp', ['ngRoute']);
//Define Routing for app
myApp.config(['$routeProvider', function ($routeProvider) {
$routeProvider.
when('/customer', {
templateUrl: 'partials/customer.html',
controller: 'CustomerController',
resolve: {
loadData: function($q){
return LoadData2($q,'home');
}
}
}).
otherwise({
redirectTo: '/home'
});
}]);
//controllers start here and are defined in their each JS file
var controllers = {};
//only master controller is defined in app.js, rest are in separate js files
controllers.MasterController = function($rootScope, $http){
$rootScope.$on('$routeChangeStart', function(){
if(GlobalSessionToken == ''){
GetSession();
}
console.log('START');
$rootScope.loadingView = true;
});
$rootScope.$on('$routeChangeError', function(){
console.log('ERROR');
$rootScope.loadingView = false;
});
};
controllers.CustomerController = function ($scope) {
if(GlobalSessionToken != ''){
//do something
}
}
//adding the controllers to myApp angularjs app
myApp.controller(controllers);
//controllers end here
function GetSession(){
$http({
url: GetSessionTokenWebMethod,
method: "POST",
data: "{}",
headers: { 'Content-Type': 'application/json' }
}).success(function (data, status, headers, config) {
GlobalSessionToken = data;
}).error(function (data, status, headers, config) {
console.log(data);
});
}
And my HTML has following sections:
<body ng-app="myApp" ng-controller="MasterController">
<!--Placeholder for views-->
<div ng-view="">
</div>
</body>
How can I make sure this GetSession() is always called at the very beginning of my application start and before any other controller calls and also called only once.
EDIT: This is how I added run method as per Maxim's answer. Still need to figure out a way to wait till $http call returns before going ahead with controllers.
//Some initializing code before Angular invokes controllers
myApp.run(['$rootScope','$http', '$q', function($rootScope, $http, $q) {
return GetSession($http, $q);
}]);
function GetSession($http, $q){
var defer = $q.defer();
$http({
url: GetSessionTokenWebMethod,
method: "POST",
data: "{}",
headers: { 'Content-Type': 'application/json' }
}).success(function (data, status, headers, config) {
GlobalSessionToken = data;
defer.resolve('done');
}).error(function (data, status, headers, config) {
console.log(data);
defer.reject();
});
return defer.promise;
}

Even though some of the solutions here are perfectly valid, resolve property of the routes definition is the way to go, in my opinion. Writing your app logic inside session.then in every controller is a bit too much , we're used such approach too in one of the projects and I didn't work so well.
The most effective way is to delay controller's instantiation with resolve, as it's a built-in solution. The only problem is that you have to add resolve property with similar code for every route definition, which leads to code duplication.
To solve this problem, you can modify your route definition objects in a helper function like this:
function withSession(routeConfig) {
routeConfig.resolve = routeConfig.resolve || {};
routeConfig.resolve.session = ['getSessionPromise', function(getSessionPromise) {
return getSessionPromise();
}]
return routeConfig;
}
And then, where define your routes like this:
$routeProvider.when('/example', withSession({
templateUrl: 'views/example.html',
controller: 'ExampleCtrl'
}));
This is one of the many solutions I've tried and liked the most since it's clean and DRY.

You can't postpone the initialisation of controllers.
You may put your controller code inside a Session promise callback:
myApp.factory( 'session', function GetSession($http, $q){
var defer = $q.defer();
$http({
url: GetSessionTokenWebMethod,
method: "POST",
data: "{}",
headers: { 'Content-Type': 'application/json' }
}).success(function (data, status, headers, config) {
GlobalSessionToken = data;
defer.resolve('done');
}).error(function (data, status, headers, config) {
console.log(data);
defer.reject();
});
return defer.promise;
} );
myApp.controller( 'ctrl', function($scope,session) {
session.then( function() {
//$scope.whatever ...
} );
} );
Alternative: If you don't want to use such callbacks, you could have your session request synchronous, but that would be a terrible thing to do.

You have not provided any details related to GetSession. For scenarios like this you should use the resolve property while defining your routes in $routeProvider. I see you are using resolve already.
What you can do now is to wrap the GlobalSessionToken into a Angular service like GlobalSessionTokenServiceand call it in the resolve to get the token before the route loads. Like
resolve: {
loadData: function($q){
return LoadData2($q,'home');
},
GlobalSessionToken: function(GlobalSessionTokenService) {
return GlobalSessionTokenService.getToken() //This should return promise
}
}
This can then be injected in your controller with
controllers.MasterController = function($rootScope, $http,GlobalSessionToken){