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How can I update meta tags in AngularJS?

I am developing an application using AngularJS. I want to update meta tags on route change.
How can I update meta tags in AngularJS which can be shown in "view source" on the page?

here is a 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>
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1 Answer

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<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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