angularjs - How to set cookies in angular dynamic -

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i have problem cookies in angularjs. tried create cookie when user did action. saw others examples, in each example cookie created statical when controller created. html code:

<!doctype html> <html>  <head>     <link rel="stylesheet" type="text/css" href="style/bootstrap-3.3.6.min  .css">     <link rel="stylesheet" type="text/css" href="style/style.css"> </head>  <body ng-app="myapp">     <div class="container-fluid" ng-controller="myctrl">         <div class="row" id="all_products" data-ng-init="init()">         </div>       </div>     <script type="text/javascript" src="script/angular-1.4.9.min.js"></script>     <script type="text/javascript" src="script/angular-cookies-1.4.9.min.js"></script>     <script type="text/javascript" src="script/data.js"></script>     <script type="text/javascript" src="script/app.js"></script> </body>  </html>

and angular code: 

var app = angular.module("myapp", ['ngcookies']);  app.controller("myctrl", function($scope, $compile, $http, $cookies) {     $scope.init = function() {         var el = '';         (var i=0; i<data.length; i++){             el += '<div class="preview col-xs-12 col-sm-6 col-md-4 col-lg-4">';                 el += '<div class="preview-body">';                     el += '<div class="left col-xs-8 col-sm-8 col-md-8 col-lg-8">';                         el += '<button class="btn btn-primary preview_buy" ng-click="addtocart('+i+')">buy</button>';                     el += '</div>';                     el += '<div class="right col-xs-4 col-sm-4 col-md-4 col-lg-4">';                         el += '<a href="product.html?id='+i+'"><img src="'+data[i].images[0]+'"/></a>';                     el += '</div>';                 el += '</div>';             el += '</div>';         }         var element = angular.element(document.queryselector('#all_products'));         var generated = element.html(el);         $compile(generated.contents())($scope);     }      $scope.addtocart = function(id) {         $cookies.put('checked', id);         var value = $cookies.get("checked");         console.log(value);     } });

my problem in function "addtocart". value undefined. why?


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