Is there a way to make a field "Always show" but only "required" dependent on another field selection?

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Is there a way to make a field "Always show" but only "required" dependent on another field selection?

I have a required field (Field A) with 4 values to choose from, in the form of a "drop down". The field (Field B) immediately following Field A is a "text field" meant as an area for comments in respect to the 4th value selection of the "drop downs". 

Is there anyway then to make Field B "ALWAYS SHOW" yet "required" ONLY when a person selects the 4th value from the drop down menu in Field A?

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Level 10 - Community Moderator

Re: Is there a way to make a field "Always show" but only "required" dependent on another field selection?

Yes, but only with JS (leave the field as not required by default, then enforce the requirement onValidate if applicable).

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Re: Is there a way to make a field "Always show" but only "required" dependent on another field selection?

Again, thank you so much for taking the time to answer my questions  It is very helpful!