Dependent Fields

Is it possible to have dependent fields in a form that are hidden initially but appear based on user input (checking a radio box)?

For example, a form has one required field with a “Yes” radio box and a “No” radio box. If the user selects “Yes”, the form doesn’t change and it can be submitted. If the user selects “No”, a second required field appears that can be completed and then the form can be submitted.

This can probably be done with a redirect workaround but I’m looking for a clean, single-form solution. Unlike the example, the actual form will have multiple fields.

Thanks!

Nick

https://ww.wp.xz.cn/plugins/si-contact-form/