Gridview, Pjax

Hello everyone, well, I have the following doubts:

Would be possible to update a GridView in a Pjax, passing a the parameter of the own form.

The scenario is the following, there is a dropDownList to select a city, from the chosen city would be generated models of the GridView.

In fact it was possible to update the information Pjax only with static data within the action controller.