How to limit words length in texbox input for wp caldera forms

I chose caldera forms because it was simple to work on conditional form features. However i have a requirement to add words length limit in 2 separate textboxes with values 15 - 50 respectively. It does have options for custom css class. Is it possible with css class or is there any php function to put a limit based on css class i create OR some javascripting. Expecting some examples please. Thanks.

via Chebli Mohamed