AngularJS Example

HTML

<div ng-app="">
  <div ng-controller="MyCntrl">
    <select ng-model="mybool">
        <option value="false">Not Included</option>
        <option value="true">Included</option>
    </select>
    <p>
    Currently selected: {{ mybool }} opposite: {{ !mybool }}
   </p> 
 </div>
</div>

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.min.js"></script>
<style>
​.ng-invalid { border: 1px solid red; }​

JavaScript

function MyCntrl($scope) {

  $scope.mybool = true;
}