AngularJS Example:

by Gopinath Kaliappan

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div ng-app>

  <h2>Todo</h2>
  <div ng-controller="TodoCtrl">
  <div>
  <div ng-repeat="i in [1,2,3,4,5,6]"> 
    <div class="circle" style="top: {{getRandomNumbers()}}px;left: {{getRandomNumbers()}}px;">
      {{getRandomNumbers()}} 
     </div>
  </div>
</div>
    <span>{{remaining()}} of {{todos.length}} remaining</span>
    [ <a href="" ng-click="archive()">archive</a> ]
    <ul class="unstyled">
      <li ng-repeat="todo in todos">
        <input type="checkbox" ng-model="todo.done">
        <span class="done-{{todo.done}}">{{todo.text}}</span>
      </li>
    </ul>
    <form ng-submit="addTodo()">
      <input type="text" ng-model="todoText"  size="30"
             placeholder="add new todo here">
      <input class="btn-primary" type="submit" value="add">
    </form>
  </div>
</div>

CSS

.done-true {
  text-decoration: line-through;
  color: grey;
}

.circle {
  background: grey;
  opacity: 0.6;
  border-radius: 50%;
  height: 50px;
  position: absolute;
  width: 50px;
}

JavaScript

function TodoCtrl($scope) {

	$scope.getRandomNumbers = function(index) {
  		return Math.round(Math.random() * window.innerWidth);
  }
  
  $scope.todos = [
    {text:'learn angular', done:true},
    {text:'build an angular app', done:false}];

  $scope.addTodo = function() {
    $scope.todos.push({text:$scope.todoText, done:false});
    $scope.todoText = '';
  };

  $scope.remaining = function() {
    var count = 0;
    angular.forEach($scope.todos, function(todo) {
      count += todo.done ? 0 : 1;
    });
    return count;
  };

  $scope.archive = function() {
    var oldTodos = $scope.todos;
    $scope.todos = [];
    angular.forEach(oldTodos, function(todo) {
      if (!todo.done) $scope.todos.push(todo);
    });
  };
}