How can I update meta tags in AngularJS? -


i developing application using angularjs. want update meta tags on route change.
how can update meta tags in angularjs can shown in "view source" on page?

here html code - 

  <!doctype html>     <html ng-app="app">         <head>             <meta name="viewport" content="width=device-width, initial-scale=1.0">             <meta name="fragment" content="!" />             <meta name="title" content="test app">             <meta name="description" content="test app">             <meta name="keywords" content="test,app">              <link rel="stylesheet" href="css/jquery-ui-1.10.2.custom.min.css" />             <link rel="stylesheet" href="css/extra.css" />             <script src="js/libs/jquery-1.8.3.min.js"></script>             <script src="js/libs/jquery-ui-1.10.2.custom.min.js"></script>             <script src="js/libs/angular.min.js"></script>             <script src="js/controller.js"></script>             <script src="js/routes.js"></script>         </head>         <body>             <div ng-controller="mainctrl" class="main-container" loading>                 <div class="container-holder">                     <div class="container">                         <div ng-include src='"elements/header.html"'></div>                         <div ng-view class="clearfix"></div>                     </div>                 </div>                  <div ng-controller="userctrl" id="test">                     <div class="container" class="login-container">                         <div id="login-logo">                             <img src="images/logo-300.png" alt="" class="login-img"/>                             <br />                             <div ng-view></div>                         </div>                     </div>                 </div>         </body>     </html> 

<html ng-app="app">     <title ng-bind="metaservice.metatitle()">test</title>     <meta name="description" content="{{ metaservice.metadescription() }}" />     <meta name="keywords" content="{{ metaservice.metakeywords() }}" />   <script>     var app = angular.module('app',[]);     app.service('metaservice', function() {        var title = 'web app';        var metadescription = '';        var metakeywords = '';        return {           set: function(newtitle, newmetadescription, newkeywords) {               metakeywords = newkeywords;               metadescription = newmetadescription;               title = newtitle;            },           metatitle: function(){ return title; },           metadescription: function() { return metadescription; },           metakeywords: function() { return metakeywords; }        }     });     app.controller('myctrl',function($scope,$rootscope,metaservice){       $rootscope.metaservice = metaservice;       $rootscope.metaservice.set("web app","desc","blah blah");    }); </script>  <body ng-controller="myctrl"></body>   </html>

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