There are several methods and techniques that come handy in the case you need to call an external resource periodically or if you are waiting for a server push, but I present here an easy and straightforward one using HTML5's Server-Sent Events (SSE).
I discovered Twitter Bootstrap almost two years ago. After trying it out for a while I fell in love with it. It didn't take long before I realized that it would be great to write an extension that allowed developers to start using Bootstrap in their Yii projects. One night I sat down and started writing what later became my now popular bootstrap extension. Now that the extension is quite widely used in the community I felt that it was time to write about how to use Bootstrap to its full potential. If you use the Bootstrap CSS files you're really missing out on some great features. After reading this article you'll be able to take full advantage of Bootstrap using LESS.
As written on the API docs: An Action Provider Widget is a widget that has declared several actions by using its 'public static function actions()'. After, a Controller can easily import all its declared actions on its 'public function actions()'.