Making form fields mandatory dynamically - input of one field changes if a field is required or not

Making form fields mandatory dynamically - input of one field changes if a field is required or not

Hi all,

   I am trying to see if there is a way to dynamically change if a field is required or not - I found some forum posts from years and years ago about workarounds and showing alert messages, but nothing that was recent so I wanted to see if it is possible without the workaround suggested there. The concept is that if a user inputs value "Yes" into field A then it makes field B required or if they input "No" it makes field B not required but makes field C required. 

Thanks in advanced. 

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