Passing data between controllers in Angular JS?

how do pass this clicked products from first controller to second?

On click you can call method that invokes broadcast:

$rootScope.$broadcast('SOME_TAG', 'your value');

and the second controller will listen on this tag like:

$scope.$on('SOME_TAG', function(response) {
      // ....
})

Since we can't inject $scope into services, there is nothing like a singleton $scope.

But we can inject $rootScope. So if you store value into the Service, you can run $rootScope.$broadcast('SOME_TAG', 'your value'); in the Service body. (See @Charx description about services)

app.service('productService',  function($rootScope) {/*....*/}

Please check good article about $broadcast, $emit

Solution without creating Service, using $rootScope:

To share properties across app Controllers you can use Angular $rootScope. This is another option to share data, putting it so that people know about it.

The preferred way to share some functionality across Controllers is Services, to read or change a global property you can use $rootscope.

var app = angular.module('mymodule',[]);
app.controller('Ctrl1', ['$scope','$rootScope',
  function($scope, $rootScope) {
    $rootScope.showBanner = true;
}]);

app.controller('Ctrl2', ['$scope','$rootScope',
  function($scope, $rootScope) {
    $rootScope.showBanner = false;
}]);

Using $rootScope in a template (Access properties with $root):

<div ng-controller="Ctrl1">
    <div class="banner" ng-show="$root.showBanner"> </div>
</div>

You can do this by two methods.

1. By using $rootscope, but I don't reccommend this. The $rootScope is the top-most scope. An app can have only one $rootScope which will be shared among all the components of an app. Hence it acts like a global variable.

2. Using services. You can do this by sharing a service between two controllers. Code for service may look like this:

   app.service('shareDataService', function() {
       var myList = [];
   
       var addList = function(newObj) {
           myList.push(newObj);
       }
   
       var getList = function(){
           return myList;
       }
   
       return {
           addList: addList,
           getList: getList
       };
   });
   

   You can see my fiddle here.

An even simpler way to share the data between controllers is using nested data structures. Instead of, for example

$scope.customer = {};

we can use

$scope.data = { customer: {} };

The data property will be inherited from parent scope so we can overwrite its fields, keeping the access from other controllers.

angular.module('testAppControllers', [])
    .controller('ctrlOne', function ($scope) {
        $scope.$broadcast('test');
    })
    .controller('ctrlTwo', function ($scope) {
        $scope.$on('test', function() {
        });
    });

I've created a factory that controls shared scope between route path's pattern, so you can maintain the shared data just when users are navigating in the same route parent path.

.controller('CadastroController', ['$scope', 'RouteSharedScope',
    function($scope, routeSharedScope) {
      var customerScope = routeSharedScope.scopeFor('/Customer');
      //var indexScope = routeSharedScope.scopeFor('/');
    }
 ])

So, if the user goes to another route path, for example '/Support', the shared data for path '/Customer' will be automatically destroyed. But, if instead of this the user goes to 'child' paths, like '/Customer/1' or '/Customer/list' the the scope won't be destroyed.

You can see an sample here: http://plnkr.co/edit/OL8of9

I saw the answers here, and it is answering the question of sharing data between controllers, but what should I do if I want one controller to notify the other about the fact that the data has been changed (without using broadcast)? EASY! Just using the famous visitor pattern:

myApp.service('myService', function() {

    var visitors = [];

    var registerVisitor = function (visitor) {
        visitors.push(visitor);
    }

    var notifyAll = function() {
        for (var index = 0; index < visitors.length; ++index)
            visitors[index].visit();
    }

    var myData = ["some", "list", "of", "data"];

    var setData = function (newData) {
        myData = newData;
        notifyAll();
    }

    var getData = function () {
        return myData;
    }

    return {
        registerVisitor: registerVisitor,
        setData: setData,
        getData: getData
    };
}

myApp.controller('firstController', ['$scope', 'myService',
    function firstController($scope, myService) {

        var setData = function (data) {
            myService.setData(data);
        }

    }
]);

myApp.controller('secondController', ['$scope', 'myService',
    function secondController($scope, myService) {

        myService.registerVisitor(this);

        this.visit = function () {
            $scope.data = myService.getData();
        }

        $scope.data = myService.getData();
    }
]);

In this simple manner, one controller can update another controller that some data has been updated.

Make a factory in your module and add a reference of the factory in controller and use its variables in the controller and now get the value of data in another controller by adding reference where ever you want

I don't know if it will help anyone, but based on Charx (thanks!) answer I have created simple cache service. Feel free to use, remix and share:

angular.service('cache', function() {
    var _cache, _store, _get, _set, _clear;
    _cache = {};

    _store = function(data) {
        angular.merge(_cache, data);
    };

    _set = function(data) {
        _cache = angular.extend({}, data);
    };

    _get = function(key) {
        if(key == null) {
            return _cache;
        } else {
            return _cache[key];
        }
    };

    _clear = function() {
        _cache = {};
    };

    return {
        get: _get,
        set: _set,
        store: _store,
        clear: _clear
    };
});

FYI The $scope Object has the $emit, $broadcast, $on AND The $rootScope Object has the identical $emit, $broadcast, $on

read more about publish/subscribe design pattern in angular here

There are three ways to do it,

a) using a service

b) Exploiting depending parent/child relation between controller scopes.

c) In Angular 2.0 "As" keyword will be pass the data from one controller to another.

For more information with example, Please check the below link :

http://www.learnit.net.in/2016/03/angular-js.html

we can store data in session and can use it anywhere in out program.

$window.sessionStorage.setItem("Mydata",data);

Other place

$scope.data = $window.sessionStorage.getItem("Mydata");

One way using angular service:

var app = angular.module("home", []);

app.controller('one', function($scope, ser1){
$scope.inputText = ser1;
});


app.controller('two',function($scope, ser1){
$scope.inputTextTwo = ser1;
});

app.factory('ser1', function(){
return {o: ''};
});



<div ng-app='home'>

<div ng-controller='one'>
  Type in text: 
  <input type='text' ng-model="inputText.o"/>
</div>
<br />

<div ng-controller='two'>
  Type in text:
  <input type='text' ng-model="inputTextTwo.o"/>
</div>

</div>

https://jsfiddle.net/1w64222q/

To improve the solution proposed by @Maxim using $broadcast, send data don't change

$rootScope.$broadcast('SOME_TAG', 'my variable');

but to listening data

$scope.$on('SOME_TAG', function(event, args) {
    console.log("My variable is", args);// args is value of your variable
})