AngularJS Example:

by Andrey Zenkov

HTML

<div ng-app="todoApp">
 
  <div ng-controller="TodoController">
      <h2>{{ counter ? counter + " раз":0+" раз"}}</h2>

      <input type="text" ng-keyup="keyPress($event.keyCode)" 
      ng-model="todotext"  size="30"
             placeholder="add new todo here">
  </div>
</div>

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.0.4/css/bootstrap-combined.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.0/angular.min.js"></script>
<style>
.done-true {
  text-decoration: line-through;
  color: grey;
}

JavaScript

angular.module('todoApp', [])
  .controller('TodoController', ['$scope', function($scope) {
      $scope.counter = 0;
      
      $scope.keyPress = function(code) {
          if (code === 13) $scope.counter++;
      }
      
  }]);