We Keep Coding

Create controllers in ng-repeat directive

I'd like to create dynamically controllers responsible for view of data from REST API. My idea is to use ng-repeat directive with data from service and inside it create object with ng-controller directive with parameter from ng-repeat output (The most important condition is that each one question must have its own $scope). Unfortunatelly I don't know how to pass data from service.
AngularJS service code
(function () {
'use strict';
angular
.module('App')
.factory('questionsDataService', questionsDataService);
questionsDataService.$inject = ['$http'];
function questionsDataService($http) {
return {
getMetadata: function (taskId) {
var metaData = $http.get('api/toDo/taskVariables/' + taskId).then(
function (response) {
return response.data;
});
return metaData;
},
getQuestionsData: function (taskId) {
var questionsData = $http.get('api/toDo/getQuestions/' + taskId).then(
function (response) {
return response.data;
});
return questionsData;
}
}
}
})();

I'm not sure if I understood the question, your title is misleading, but I will show how to get the data from the service. I don't think you need a new controller for each item in an ng-repeat, but without more info on why you are trying to do this, I can't help there.
(function () {
'use strict';
angular
.module('App')
.controller('myController', myController);
// you are injecting your service here, this will be whatever the string is from the .factory() call
myController.$inject = ['$scope', 'questionsDataService'];
// again, we are passing the service in to the controller function
function myController($scope, questionsDataService) {
// your service calls are returning promises
// this will get run when the controller is initialized
questionsDataService.getMetadata(1).then(function(data){
// here is where you can access the returned metadata
// save it to the scope so you can access it in the DOM
console.log(data);
})
// if you want to call your service on a button click, or with some other function
$scope.getQuestions = function (id) {
questionsDataService.getQuestionsData(id).then(function (data) {
// here is where you can access the returned data
// save it to the scope so you can access it in the DOM
console.log(data);
})
}
// I added a service method that returns a string, rather than a promise
// this will get run when the controller is initialized
var str = questionsDataService.getServiceName();
console.log(str);
}
})();
(function () {
'use strict';
angular
.module('App')
.factory('questionsDataService', questionsDataService);
questionsDataService.$inject = ['$http'];
function questionsDataService($http) {
return {
getMetadata: function (taskId) {
var metaData = $http.get('api/toDo/taskVariables/' + taskId).then(
function (response) {
return response.data;
});
return metaData;
},
getQuestionsData: function (taskId) {
var questionsData = $http.get('api/toDo/getQuestions/' + taskId).then(
function (response) {
return response.data;
});
return questionsData;
},
// adding this just to show you how to access functions that don't return promises
getServiceName: function () {
return "questionsDataService";
}
}
}
})();

How to pass param from controller to service in AngularJs

I'm currently working on a project to help me better understand angularjs! I am currently stuck on how to pass a parameter from the controller to service.
In my program, I have created a function called "GetForecastByLocation" when a user types in an input clicks on a button. From there I want to take their input and then pass it to the http call in service.js.
Originally, $http.get was in a long giant string of the API url, but I googled around and it seems that I'm supposed to use parameters when trying to change a portion of the string. As of right now, I know parameter is hardcoded to a specific city, but I want to take new input and pass the value of vm.city to the $http.get call.
If any one can help I would greatly appreciate it. Thank you!
controller.js
var app = angular.module('weatherApp.controllers', [])
app.controller('weatherCtrl', ['$scope','Data',
function($scope, Data) {
$scope.getForecastByLocation = function(myName) {
$scope.city = myName;
Data.getApps($scope.city);},
Data.getApps(city)
.then(function(data)){
//doing a bunch of things like converting units, etc
},
function(res){
if(res.status === 500) {
// server error, alert user somehow
} else {
// probably deal with these errors differently
}
}); // end of function
}]) // end of controller
service.js
.factory('Data', function($http, $q) {
var data = [],
lastRequestFailed = true,
promise;
return {
getApps: function() {
if(!promise || lastRequestFailed) {
promise = $http.get('http://api.openweathermap.org/data/2.5/weather?',{
params: {
q: Tokyo,
}
})
.then(function(res) {
lastRequestFailed = false;
data = res.data;
return data;
}, function(res) {
return $q.reject(res);
});
}
return promise;
}
}
});

Passing arguments to a factory method is no different than passing arguments to a plain old function.
First, set up getApps to accept a parameter:
.factory('Data', function($http, $q){
// ...
return {
getApps: function(city){
promise = $http.get(URL, {
params: {q: city}
}).then( /* ... */ );
// ...
return promise;
}
};
});
Then pass it your argument:
$scope.getForecastByLocation = function(myName) {
$scope.city = myName;
Data.getApps($scope.city);
}

It's just like setting a value to a function's context variable.
Services.js
Simple example of a service.
.factory('RouteService', function() {
var route = {}; // $Object
var setRoute_ = function(obj)
{
return route = obj;
};
var getRoute_ = function()
{
if(typeof route == 'string')
{
return JSON.parse(route);
}
return null;
};
return {
setRoute: setRoute_,
getRoute: getRoute_
};
})
Controllers.js
Simple example of Service usage:
.controller('RoutesCtrl', function ($scope, RouteService) {
// This is only the set part.
var route = {
'some_key': 'some_value'
};
RouteService.setRoute(route);
})

angular factory for $http service makes call twice

I created an angular factory for $http service. I am getting the response and able to use the same in the controller but the problem is, when i check the network tab in the browser, the http request is made twice
Factory:
app.factory('myService', function ($http, $q) {
var deferred = $q.defer();
var responseData = null;
var obj = {};
obj.getData = function(){
$http.get('test.json').success(function(response){
responseData = response;
deferred.resolve(responseData);
}).error(function(response){
deferred.reject(responseData);
});
return deferred.promise;
}
obj.myData = function(){
return responseData;
}
return obj;
});
Controller:
app.controller('myController', function($scope,myService){
myService.getData().then(function(){
$scope.myDetails = myService.myData();
});
});
what's wrong in my approach. Please provide me a solution

The way you are making your caching scenario is quite complicated and not really helpful. How do you know if data has already been loaded?
Maybe you can create a simple Caching Service to handle your caching at a single point (nr of code lines will go down).
angular.module("YourApp").factory("CachingService", [
"$q",
"$http",
function ($q, $http,) {
var cache = {};
return {
getFromCache: getFromCache
};
function getFromCache(url) {
var deferred = $q.defer();
if (cache[url]) {
deferred.resolve(cache[url]);
} else {
return $http.get(url).then(function (result) {
cache[url] = result;
return result;
});
}
return deferred.promise;
}
}
]);
And then, you simply call it inside your other service :
angular.module("YourApp").factory("myService", [
"CachingService",
function(CachingService){
return {
getData: getData
};
function getData(){
return CachingService.getFromCache("test.json");
}
}
]);
And then, inside your controller :
app.controller('myController', function($scope,myService){
myService.getData().then(function(result){
$scope.myDetails = result.Data;
});
});

you can return $http not deferred.promise

Serving processed data using factory, AngularJS

I am working on an application in which I am calling a webservice and get a response. I am using that response in 2 different modules. In first module I am using as it is and in second module I am doing some formatting and using it.
I created a service for getting data as follows
angular.module('myApp').factory('getData',function($http, $q, restURLS) {
var getData= {};
getData.getTree = function () {
var deferred = $q.defer();
$http.get(restURLS.getTree).
success(function (data) {
deferred.resolve(data);
}).error(deferred.reject);
return deferred.promise;
};
return getData;
});
for Serving response I created another factory as follows
angular.module('myApp').factory('tree', function($http, $q, restURLS, getData, messages) {
var tree= {};
tree.hierarchy = {};
tree.formattedHierarchy = {};
function formatHierarchy(data) {
//some formatting on data.
tree.formattedHierarchy = data;
}
function callTree() {
getData.getTree()
.then(function (data) {
tree.hierarchy = angular.copy(data);
formatHierarchy(data);
}).catch(function () {
//error
});
}
callTree();
return tree;
});
I want to call webservice only once. if data is loaded then factory('tree') should send the data to controller. Otherwise factory('tree') should call webservice and load data.

you need something to know if you got your tree or not... try this:
(UPDATED)
var myApp = angular.module('myApp', ['ngMockE2E'])
// FAKE HTTP CALL JUST FOR EMULATE
.run(function ($httpBackend) {
var tree = [{
node1: 'abcde'
}, {
node2: 'fghi'
}];
$httpBackend.whenGET('/tree').respond(function (method, url, data) {
return [200, tree, {}];
});
})
// YOUR HTTP SERVICE
.factory('getData', function ($http, $q) {
return {
getTree: function () {
var deferred = $q.defer();
$http.get("/tree").
success(function (data) {
deferred.resolve(data);
}).error(deferred.reject);
return deferred.promise;
}
}
})
.factory('TreeFactory', function ($http, $q, getData) {
var tree = {};
var updated = false;
tree.hierarchy = {};
tree.formattedHierarchy = {};
function formatHierarchy(data) {
//some formatting on data.
tree.formattedHierarchy = data;
}
return {
callTree: function() {
if(!updated){
console.log("making http call");
return getData.getTree().then(function (data) {
tree.hierarchy = angular.copy(data);
formatHierarchy(data);
updated = true;
return tree;
}).
catch (function () {
//error
});
}else{
console.log("tree already loaded");
var deferred = $q.defer();
deferred.resolve(tree);
return deferred.promise;
}
}
};
}).controller("MyCtrl", ['$scope', 'TreeFactory', function ($scope, TreeFactory) {
$scope.updateTree = function(){
TreeFactory.callTree().then(function(data){
$scope.tree = data;
});
};
}]);
HTML
<div ng-app="myApp" ng-controller="MyCtrl" ng-init="updateTree()">tree: {{tree}} <br><button ng-click="updateTree()">UPDATE TREE</button></div>
CHECK THE FIDDLE

AngularJS: Working with callbacks and promises

I am unable to wrap my brain around the concept of asynchronous requests.
I have a controller for my view, which is creating an object instance from a provider:
va.controller('VaCtrl',function($scope,$shipment){
$scope.shipment = $shipment.Shipment();
});
The provider:
Shipment.provider('$shipment',function(){
this.$get = function($http){
function Shipment(){
}
Shipment.prototype.fetchShipment = function(){
var shipment = undefined;
$http.post('../sys/core/fetchShipment.php',{
// some data to POST
}).then(function(promise){
shipment = promise.data;
});
return shipment;
};
return {
Shipment: function(){
return new Shipment();
}
}
}
});
My goal is to get access to the data from Shipment.prototype.fetchShipment() inside my controller. My approach:
$scope.fetchShipment = function(){
var shipment = $scope.shipment.fetchShipment();
console.log(shipment); // undefined
};
However, this will return undefined.
I read about $q, and defers, promises and callbacks, and now i am like WTF; all i want to do is to push the retrieved data to my controller, what is the best possible way to do so?

You should modify your code as shown below to return the promise from fetchshipment directly, and then use then() inside your controller.
Shipment.prototype.fetchShipment = function(){
return $http.post('../sys/core/fetchShipment.php',{
// some data to POST
})
};
$scope.fetchShipment = function(){
var shipment = $scope.shipment.fetchShipment().then(function(data){;
console.log(data);
});
};
Explanation to Code :
Calling $http return a promise which is resolved when you get the data from the server. In the code above, I have returned $http.post from service function which returns a promise. So in the controller you are waiting for promise to be resolved, and when the promise is resolved, the result is logged to the console.
Read about more promise documentation on angular:
http://docs.angularjs.org/api/ng.$q
http://docs.angularjs.org/api/ng.$http

Just the give you an example how to get your example working with your own promise.
It's much more simple if you use $http builtin promise, so it's an $q-example:
angular.module('myApp', []).controller("myAppCtrl", function ($scope, $shipment) {
$shipment.Shipment().fetchShipment().then(function (shipment) {
$scope.shipment = shipment
});
}).provider('$shipment', function () {
this.$get = function ($http, $q) {
function Shipment() {
}
Shipment.prototype.fetchShipment = function () {
var defered = $q.defer();
demodata = {name: "jan", id:8282};
$http.post('/echo/json/', 'json=' + encodeURIComponent(angular.toJson(demodata)), {
headers: {
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
}
}).then(function (response) {
//resolve promise
defered.resolve(response.data);
});
return defered.promise;
};
return {
Shipment: function () {
return new Shipment();
}
}
}
});
<div ng-controller="myAppCtrl">{{shipment}}</div>
JSFiddle (use JSFiddle echo-service as data provider):
http://jsfiddle.net/alfrescian/ayke2/
More about promises:
http://blog.parse.com/2013/01/29/whats-so-great-about-javascript-promises/
http://www.egghead.io/video/o84ryzNp36Q
AngularJS : Where to use promises?
stackoverflow.com/questions/15604196/… egghead.io/video/o84ryzNp36Q