AngularJS Hello World Ctrl

HTML

<div ng-app="">
  <div ng-controller="MyCtrl">
      <div class="btn-group" ng-repeat="item in obj">
            <button data-ng-click="item.style = {'background' : item.color}" data-ng-style="item.style" type="radio" class="btn-group btn-xs btn-group-xs">{{item.name}
            </button>
        </div>
  </div>
</div>

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
<style>

.ng-invalid { 
    border: 1px solid red; 
}

JavaScript

function MyCtrl($scope) {
  $scope.obj = [
      {
          'id':1,
          'color':'#ff0000',
          'name':'final',
          'style' : {
              'background-color' : ''
          }
      },
      {
          'id':2,
          'color':'#ffff99',
          'name':'start',
          'style' : {
              'background-color' : ''
          }
      }
  ];
}