I was able to set up the infinite scroll of select2 in Yii. I am glad to share it with you. The demo and source code can be found here. However, select2 for Yii can be found here which uses a widget.

Sometime its very important to perform many actions/operation with limited time frame for friendly use, select2 provides a lot of such functionality , I just extend it tags functionality to provide a quick use for developer to save time, as I spent much time on it.