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Best way to pass variables between controllers

I am using three Angular controllers:
**Controller1**
var fetchStudentDetails = function(){
var sDetails = myService.getList(//url-1 here);
sDetails.then(function (data) {
$scope.studentData = data.list;
var studentId = $scope.studentData[0].id;
});
}
fetchStudentDetails();
$scope.loadSecondLevel = function(){
$state.go('secondLevel');
}
**Controller2**
var fetchClassDetails = function(){
var sDetails = myService.getList(//url-2 here);
sDetails.then(function (data) {
$scope.classData = data.list;
var className = $scope.classData[0].name;
});
}
fetchClassDetails();
$scope.loadThirdLevel = function(){
$state.go('thirdLevel');
}
**Controller3**
$scope.putStudentDetails = function(){
// Here I need studentId,className for updateResource
var sDetails = myService.updateResource(//url-3 here);
sDetails.then(function (data) {
});
}
Where I have to pass studentId (in Controller1), className (in Controller2) into a function which in Controller3. I tried with $rootScope, it is working but when refresh the page $rootScope values become empty. Does anyone know how to do this?

Your question could be split into two aspects:
1. How to share data between controllers
The best practice to share data in Angular 1.x is using factory, store the shared data in a factory service, and expose access methods to controllers:
factory('DetailData', function(myService, $q){
var _details;
function __getDetailData(){
return details
}
function __setDetailData(){
return myService.getList().then(function(data){
_details = data;
})
}
return {
getDetailData: __getDetailData,
setDetailData: __setDetailData
}
})
controller('myContrller', function(DetailData, $scope){
$scope.data = DetailData.getDetailData();
})
2. How to persist data when page refreshed,
you can use localStorage to keep data persistent during page reloading, many tools & libraries can achieve this, for example ngStorage, or you could reset the data from server every time your angular application started:
//this would register work which would be performed
//when app finish loading and ready to start.
angular.module('app').run(function(DetailData){
DetailData.setDetailData();
})

Depending on what problem you are solving.
There are three options:
Is to save data to $rootScope
Is to use $scope.$emit & $scope.$on functions.
Use a custom Service to store the data
And if you need to save data, so it was available after full page reload - localStorage.

Hey this question are responded in Passing data between controllers in Angular JS?
But the simple response is in the services.

Setting controller attributes inside ajax call

I am new in AngularJS and I'm with a doubt about the controller attributes. I created an attribute called anuncio, this attribute has an array of objects as showed in the image bellow:
var anuncioModule = angular.module('anuncioModule',[]);
anuncioModule.controller('RegistrationController',['$http',function ($http){
this.anuncios;
this.loadAnuncios = function loadAnuncios(){
$http.get('http://localhost:8080/pederofer/anuncios/get.action').then(function(result){
this.anuncios.push.apply(this.anuncios, result.data);
});
}
}]);
When I call my webservice with the function loadAnuncios and try to set the values directly using "this.anuncios" i get the message "this.anuncios is undefined". but if i create a var called anuncs and set "this.anuncios = anucs", and instead of set my AJAX call directly into this.anuncios I set to anucs as the image bellow, It works.
var anuncioModule = angular.module('anuncioModule',[]);
var anuncs =[];
anuncioModule.controller('RegistrationController',['$http',function ($http){
this.anuncios = anuncs ;
this.loadAnuncios = function loadAnuncios(){
$http.get('http://localhost:8080/pederofer/anuncios/get.action').then(function(result){
anuncs.push.apply(anuncs, result.data);
});
}
}
My question is, why it works?

I might suggest going about what you're doing in a different way.
var anuncioModule = angular.module('anuncioModule',[]);
anuncioModule.controller('RegistrationController', ['$scope', '$http', function ($scope, $http) {
$scope.anuncios = [];
$scope.loadAnuncios = function() {
$http.get('http://localhost:8080/pederofer/anuncios/get.action').then(function(result) {
$scope.anuncios = result.data;
});
};
}
I don't know if that's exactly what you're after but maybe that will make a lightbulb go off for you.

Angular.js render data in controller

I have a rather simple question. I have a simple controller and its $scope.coords = []; renders JSON in HTML:
[24.43359375, 54.6611237221]
[25.2905273438, 54.6738309659]
[25.3344726562, 54.6102549816]
[25.2685546875, 54.6801830971]
[25.2960205078, 54.6611237221]
How can I render that JSON not in html, but in my controller itself ? The code looks like that. Please see the comment in code:
propertyModule.controller('propertyController', ['$scope', 'Property', function ($scope, Property) {
// Query returns an array of objects, MyModel.objects.all() by default
$scope.properties = Property.query();
// Getting a single object
$scope.property = Property.get({pk: 1});
$scope.coords = [];
$scope.properties = Property.query({}, function(data){
console.log(data);
angular.forEach(data , function(value){
$scope.coords.push(value.coordinates);
});
});
$scope.positions = //$Resource('realestate.property').items();
[
[54.6833, 25.2833], [54.67833, 25.3033] // those coordinates are hardcoded now, I want them to be rendered here by $scope.coords
];
}]);

First off, you're showing us a bunch of arrays, not a JSON document. But since your code seems to be working, I'll assume you do have a valid JSON to work with.
You need to consider the fact that you are making an asynchronous request here :
$scope.properties = Property.query({}, function(data) {
console.log(data);
angular.forEach(data , function(value){
$scope.coords.push(value.coordinates);
});
});
This means you won't be able to fetch data from $scope.coords before anything has arrived.
There are several ways to solve that :
You could simply fetch data while you're still in the loop :
angular.forEach(data , function(value) {
$scope.coords.push(value.coordinates);
if('your condition') {
$scope.positions.push(value.coordinates);
}
});
You could use a promise, see the angular doc.
Or you could watch over $scope.coords with $scope.$watch.

Angular Wont update the DOM but logs the data to console

Do you know why wont Angularjs update the div. However I am able to log the data to console.
What am I missing here?
I have added a fiddle;
function jsonp_example($scope, $http) {
$scope.doRequest = function() {
var url = "http://public-api.wordpress.com/rest/v1/sites/wtmpeachtest.wordpress.com/posts?callback=JSON_CALLBACK";
$http.jsonp(url)
.success(function(data){
console.log(data.found);
});
};
}
http://jsfiddle.net/a4Rc2/850/

You need to assign the result data to scope variable:
$http.jsonp(url).success(function (data) {
$scope.data = data;
console.log(data.found);
});
Otherwise Angular has no idea that you want this response data to be displayed anywhere.
Demo: http://jsfiddle.net/a4Rc2/853/

save $location parameters state AngularJS

How do I save URL parameters state throughout lifecycle of application using pushState?
Page load.
Go to "/search" via href
submitSearch() through filter fields where $location.search(fields)
Go to "/anotherPage" via href
Go back to "/search" via href
Search paramters are set back to what they last were.
Is this a built in feature somewhere?
If not what's the best way to go about this?

If you're planning on a mostly single page website through pushState, you might want to get an intimate understanding of $routeProvider (http://docs.angularjs.org/api/ngRoute.%24routeProvider).
To go further down the rabbit hole, I would recommend looking at the ui-router module: (https://github.com/angular-ui/ui-router). $stateProvider (from ui-router) and $routeProvider work very similar, so sometimes the ui-router docs can give insights that you can't find in the poor documentation of the $routeProvider.
I reccomend going through the five page ui-router documentation (https://github.com/angular-ui/ui-router/wiki) page by page.
After all that preamble, here's the practical: you would set up a factory that holds history data and use the controller defined in your $routeProvider/$stateProvider to access and manipulate that data.
Note: the factory is a service. A service is not always a factory. The namespace goes:
angular.module.<servicetype[factory|provider|service]>.
This post explains the service types: https://stackoverflow.com/a/15666049/2297328. It's important to remember that they're all singletons.
Ex:
var myApp = angular.module("myApp",[]);
myApp.factory("Name", function(){
return factoryObject
});
The code would look something like:
// Warning: pseudo-code
// Defining states
$stateProvider
.state("root", {
url: "/",
// Any service can be injected into this controller.
// You can also define the controller separately and use
// "controller: "<NameOfController>" to reference it.
controller: function(History){
// History.header factory
History.pages.push(History.currentPage);
History.currentPage = "/";
}
})
.state("search", {
url: "/search",
controller: function(History, $routeParams) {
History.lastSearch = $routeParams
}
});
app.factory('<FactoryName>',function(){
var serviceObjectSingleton = {
pages: []
currentPage: ""
lastSearch: {}
}
return serviceObjectSingleton
})
If you're wondering what the difference between $routeProvider and $stateProvider is, it's just that $stateProvider has more features, mainly nested states and views... I think.

The easiest way is using cookies, angularjs provides a wrapping service for that.
Simply when you go to "/search" save your current URL parameters with "$cookieStore.put()" and once you've back you've got what you need with "$cookieStore.get()".
See the documentation at angularjs cookie store

I made a locationState service, you simply give it the values you want to persist and it stores them in the URL. So you can store all the state you want across all routes in your app.
Use it like this:
angular.module('yourapp')
.controller('YourCtrl', function ($scope, locationState) {
var size = locationState.get('size');
;
// ... init your scope here
if (size) {
$scope.size = size;
}
// ...and watch for changes
$scope.$watch('size', locationState.setter('size'));
}
Here's the code:
// Store state in the url search string, JSON encoded per var
// This usurps the search string so don't use it for anything else
// Simple get()/set() semantics
// Also provides a setter that you can feed to $watch
angular.module('yourapp')
.service('locationState', function ($location, $rootScope) {
var searchVars = $location.search()
, state = {}
, key
, value
, dateVal
;
// Parse search string
for (var k in searchVars) {
key = decodeURIComponent(k);
try {
value = JSON.parse(decodeURIComponent(searchVars[k]));
} catch (e) {
// ignore this key+value
continue;
}
// If it smells like a date, parse it
if (/[0-9T:.-]{23}Z/.test(value)) {
dateVal = new Date(value);
// Annoying way to test for valid date
if (!isNaN(dateVal.getTime())) {
value = dateVal;
}
}
state[key] = value;
}
$rootScope.$on('$routeChangeSuccess', function() {
$location.search(searchVars);
});
this.get = function (key) {
return state[key];
};
this.set = function (key, value) {
state[key] = value;
searchVars[encodeURIComponent(key)] = JSON.stringify(value);
// TODO verify that all the URI encoding etc works. Is there a mock $location?
$location.search(searchVars);
};
this.setter = function (key) {
var _this = this;
return function (value) {
_this.set(key, value);
};
};
});