Develop Reference

Angular http json request issue

Hello I have a simple question but I'm running into problems. I edited some code that I found on line. I'm trying to utilize an Angular http service to retrieve JSON data but it doesn't seem to be working
var app = angular.module('app', []);
app.controller('MainCtrl', function($scope, $http) {
$http.get('https://www.dropbox.com/s/325d678ksplb7qs/names.json')
sucess(function(data, status, headers, config) {
$scope.posts = data;
}).
error(function(data, status, headers, config) {
// log error
});
});
My code example is below
http://codepen.io/jimmyt1001/pen/dPVveN

You spelled wrong sucess should be success
CODE
var app = angular.module('app', []);
app.controller('MainCtrl', function($scope, $http) {
$http.get('https://www.dropbox.com/s/325d678ksplb7qs/names.json')
.success(function(data, status, headers, config) {
$scope.posts = data;
}).
error(function(data, status, headers, config) {
// log error
});
});

you should use a service for this:
json.service('getJson', ['$http', function ($http) {
var promise = null;
//return service
return function () {
if (promise) {
return promise;
} else {
promise = $http.get('url');
return promise;
}
};
}]);
function MainCtrl($scope, getJson) {
getJson().success(function (data) {
$scope.json = data;
});
};
Remember to inject the service name in your controller.

tl;dr
It should be like this:
var app = angular.module('app', []);
app.controller('MainCtrl', function($scope, $http)
{
$http.get('https://www.dropbox.com/s/325d678ksplb7qs/names.json')
.success(function(data, status, headers, config)
{
$scope.posts = data;
})
.error(function(data, status, headers, config)
{
// log error
});
});
I.e. you're missing a dot (.) before success and your success is incorrectly typed (you type sucess).
Original
Your code should be structured like this:
// Simple GET request example :
$http.get('/someUrl').
success(function(data, status, headers, config) {
// this callback will be called asynchronously
// when the response is available
}).
error(function(data, status, headers, config) {
// called asynchronously if an error occurs
// or server returns response with an error status.
});
As explained in the docs.
Yours is like this:
$http.get('https://www.dropbox.com/s/325d678ksplb7qs/names.json')
sucess(function(data, status, headers, config) {
Wherea you're missing a dot (.) before the success, and your success is spelled wrong (yours is sucess).
It's decent practice to copy existing demos until you're certain on how they're really setup. Also, use your developer tools to catch easy bugs like this.
It's also possible that your dropbox call is simply invalid, but if you fix your code accordingly then the error method should be able to catch it and you should be able to see the error.

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.

Angularjs return data from the promise in controller's scope

Dear AngularJS savies,
How to set $scope.data in the controller having a promise returned from a factory. All I can do is work with the data returned in the scope of the method of the factory's object and I cannot "load" the data in a value existing in the controller's scope. How can I pass the data into controller's scope?
The code sequences as following
This is the factory:
var features = {};
// the method returns a promise tot he controller needed to be delt with .then()
features.getPromise = function(){
//make a promise
var promise = $http({method: 'GET', url: '../../LIBS/inc/getAllGeoFeatures.php'})
.success(function(data, status, headers, config){
return data;
})
.error(function(data, status, headers, config){
$log.warn(data, status, headers, config);
});
return promise;
};
This is the controller:
$scope.data = 'null';
factGetFeat.getPromise().then(function(promise){
$scope.data = promise;
$log.info($scope.data); //gets the object all right
// here I can work with the data but I cannot share it with the controller
// i.e. with the view
});
$log.info($scope.data); //$scope.data is still null and I need it loaded with the data
I need some counceling because I sense I go nowhere
I even tried to load $scope.data with the outcome of the method, but I only get the promsise object and not the data:
Object {then: function, catch: function, finally: function}
Please advise.
P.S. I use angular 1.2.x
Thank you very much for your time and patience.

It should be
factGetFeat.getPromise().then(function(promise){
$scope.data = promise;
$log.info($scope.data); //gets the object all right
}).then(function(){
// here you can see $scope.data updated with a new value
$log.info($scope.data);
});
as alternative:
var promise = factGetFeat.getPromise().then(function(promise){
$scope.data = promise;
$log.info($scope.data); //gets the object all right
});
promise.then(function(){
// here you can see $scope.data updated with a new value
$log.info($scope.data);
});
.then is evaluated when 1st promise resolved

You are doing it almost right. You only need to return the promise from your service.
If I understand you question you are concerned about $scope.data being null when you call $log.info($scope.data) on the very last page. And that is perfectly correct. $scope.data will be set later, when the HTTP call is finished successfully.
If you need to do any operations only when the data arrived, you must include it success callback.
Here is how it could look like:
var app = angular.module('app',[]);
app.factory('featuresService', ['$http', '$log', function($http, $log) {
var getPromise = function() {
//create the promise, this will be returned from this function
var promise = $http({method: 'GET', url: '../../LIBS/inc/getAllGeoFeatures.php'});
//on error do some logging here
promise.error(function(data, status, headers, config) {
$log.warn(data, status, headers, config);
});
return promise;
};
return {
getPromise: getPromise;
}
}]);
app.controller('testCtrl', 'featuresService', function($scope, featuresService) {
//set initial values
$scope.data = null;
$scope.vectorAllLibs = null;
var init = function() {
featuresService.getPromise().then(function(data) {
$scope.data = data;
$scope.vectorAllLibs = convertVectorAllLibs(data);
};
};
var convertVectorAllLibs = function(data) {
return ol.source.GeoJSON({ projection: 'EPSG:3857', object: data });
};
$scope.processVectorAllLibs = function() {
if (!$scope.vectorAllLibs) {
alert('sorry, no data yet!');
return;
}
//process here
};
init();
});

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){

Sending JSON using $http cause angular to send text/plain content type

I just want to send the following JSONobjects to my API backend:
{
"username":"alex",
"password":"password"
}
So I wrote the following function, using Angular $http:
$http(
{
method: 'POST',
url: '/api/user/auth/',
data: '{"username":"alex", "password":"alex"}',
})
.success(function(data, status, headers, config) {
// Do Stuff
})
.error(function(data, status, headers, config) {
// Do Stuff
});
I read in documentation for POST method that Content-Type header will be automatically set to "application/json".
But I realized that the content-type I receive on my backend (Django+Tastypie) api is "text/plain".
This cause my API to not respond properly to this request. How should I manage this content-type?

The solution I've moved forward with is to always initialize models on the $scope to an empty block {} on each controller. This guarantees that if no data is bound to that model then you will still have an empty block to pass to your $http.put or $http.post method.
myapp.controller("AccountController", function($scope) {
$scope.user = {}; // Guarantee $scope.user will be defined if nothing is bound to it
$scope.saveAccount = function() {
users.current.put($scope.user, function(response) {
$scope.success.push("Update successful!");
}, function(response) {
$scope.errors.push("An error occurred when saving!");
});
};
}
myapp.factory("users", function($http) {
return {
current: {
put: function(data, success, error) {
return $http.put("/users/current", data).then(function(response) {
success(response);
}, function(response) {
error(response);
});
}
}
};
});
Another alternative is to use the binary || operator on data when calling $http.put or $http.post to make sure a defined argument is supplied:
$http.put("/users/current", data || {}).then(/* ... */);

Try this;
$http.defaults.headers.post["Content-Type"] = "application/json";
$http.post('/api/user/auth/', data).success(function(data, status, headers, config) {
// Do Stuff
})
.error(function(data, status, headers, config) {
// Do Stuff
});