javascript - Getting error when pass data between controllers using sample service -

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as part of angular js learning, created small app pass data between 2 controllers using services..below code pass data between 2 controllers..

controller code 

<!doctype html> <html lang="en-us" ng-app="myapp"> <head> <title></title> <script src="https://code.angularjs.org/1.5.8/angular.min.js"></script> <script type="text/javascript">      var app = angular.module('myapp', []);  app.service('sampleservice', [function () {   this.user = [name = 'pra', empno ='1234']   this.designation = 'teamlead';  }]) app.controller('namectrl', ['$scope','$sampleservice', function ($scope,$sampleservice) {  $scope.empname  = $sampleservice.user.name;  $scope.empnumber = $sampleservice.user.empno;  $scope.empdesignation = $sampleservice.designation;  $scope.changevals = function(){     $sampleservice.user.empno = '9876';     $sampleservice.designation = 'manager';     $scope.empnumber = $sampleservice.user.empno;     $scope.empdesignation = $sampleservice.designation; }     }])  app.controller('namectrl1', ['$scope','$sampleservice', function ($scope) {   $scope.uempiid = $sampleservice.user.empno;   $scope.uempdesignation = $sampleservice.designation;  $scope.updatevals = function(){   $scope.uempiid = $sampleservice.user.empno;   $scope.uempdesignation = $sampleservice.designation; } }])  </script>  </head>

below code html code 

<body>     <div ng-controller="namectrl"> <div><b> details - controller 1</b></div> <p>name : {{empname}}</p> <p>location : {{empnumber}}</p> <p>designation : {{empdesignation}}</p> <input type="button" value="change values" ng-click="changevals()" /> </div> <br /> <div ng-controller="namectrl1"> <div><b>details - controller 2</b></div> <input type="button" value="change values" ng-click="updatevals()" /> <p>location : {{uempiid}}</p> <p>designation : {{uempdesignation}}</p> </div> </body>

i not able display details , getting error

angular.js:13920 error: [$injector:unpr] http://errors.angularjs.org/1.5.8/$injector/unpr?p0=%24sampleserviceprovider%20%3c-%20%24sampleservice%20%3c-%20namectrl @ error (native)

could 1 please point me in right direction on doing wrong code ..

many in advance....

don't use '$' while injecting service in controller:

change:

app.controller('namectrl', ['$scope','$sampleservice', function ($scope,$sampleservice) {

to:

app.controller('namectrl', ['$scope','sampleservice', function ($scope,sampleservice) {

edit

also (as @estus suggested), service undefined in namectrl1

change code of namectrl2 from

app.controller('namectrl1', ['$scope','$sampleservice', function ($scope) {

to

app.controller('namectrl1', ['$scope','sampleservice', function ($scope, sampleservice) {

in code, whenever you're using sampleservice, dont use sampleservice instead of $sampleservice.

edit 2

change 

app.service('sampleservice', [function () {   this.user = [name = 'pra', empno ='1234']   this.designation = 'teamlead'; }])

to

app.service('sampleservice', [function() {               this.user = {name : 'pra', empno : '1234'};               this.designation = 'teamlead';           }])

final code this:

<!doctype html>  <html lang="en-us" ng-app="myapp">      <head>        <title></title>        <script src="https://code.angularjs.org/1.5.8/angular.min.js"></script>        <script type="text/javascript">            var app = angular.module('myapp', []);                app.service('sampleservice', [function() {                this.user = {name : 'pra', empno : '1234'};                this.designation = 'teamlead';                }])            app.controller('namectrl', ['$scope', 'sampleservice', function($scope, sampleservice) {                $scope.empname = sampleservice.user.name;                $scope.empnumber = sampleservice.user.empno;                $scope.empdesignation = sampleservice.designation;                $scope.changevals = function() {                    sampleservice.user.empno = '9876';                    sampleservice.designation = 'manager';                    $scope.empnumber = sampleservice.user.empno;                    $scope.empdesignation = sampleservice.designation;                }            }])                app.controller('namectrl1', ['$scope', 'sampleservice', function($scope, sampleservice) {                $scope.uempiid = sampleservice.user.empno;                $scope.uempdesignation = sampleservice.designation;                $scope.updatevals = function() {                    $scope.uempiid = sampleservice.user.empno;                    $scope.uempdesignation = sampleservice.designation;                }            }])        </script>    </head>    <body>        <div ng-controller="namectrl">            <div><b> details - controller 1</b>            </div>            <p>name : {{empname}}</p>            <p>location : {{empnumber}}</p>            <p>designation : {{empdesignation}}</p>            <input type="button" value="change values" ng-click="changevals()" />        </div>        <br />        <div ng-controller="namectrl1">            <div><b>details - controller 2</b>            </div>            <input type="button" value="change values" ng-click="updatevals()" />            <p>location : {{uempiid}}</p>            <p>designation : {{uempdesignation}}</p>        </div>    </body>  </html>


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