How can I capture the value of the tag in MVC page?

HI Experts:

I use "<thtmlb:inputfield>" and "<thtmlb:dropdownLIstBox>" in the page of the view.

Now I want to capture the value of the inputfield and dropdownListBox in the event that is triggered when a button tag of the page in the htm is Clicked, the event is in the view controller implementation class, but I don't now which sentence can capture the value.

Please help me. Thanks.