Conditional Form Validation

[butchewing]

Is it possible to set a form field to be required if another form field has a value?

Pseudo Code Examples:

if ( "first_name" ) { "last_name" is required }

if ( "yes_no" === "yes" ) { "phone_number" is required }

I can add the required class to the labels on the form with Javascript, but obviously, the validation is not enforced on submit if the rule is not added to the field in the Controller.