How do I require a conditional field (require one field if another field is selected/checked) – Real

Use Required If Any if you have a field that is only required if another field is selected/checked.

A common example is on the disclosure document: let's say your board lists possible water supplies and one of those options is "Other." If the client selects "Other," you want them to enter additional information - what is the other?

Step 1: Make sure you know the name of the field that will trigger the requirement.

In this example, if the client checks the box next to "Other," the textbox next to other is required.
So click the checkbox next to Other and take note of the field name in the bottom right corner.

Step 2: Now, click the item that is required once the checkbox is filled out. In this case, it's the textbox next to Other.

On the right side, check Required If
Check any are selected
In the dropdown, select the field name that triggers the requirement. In this case, it's the checkbox named "Other."

That's it! You're done. Now, when a customer checks the box next to "Other" for Water Supply, they will need to enter a description in the text box next to "Other."