Require that one of two form fields is filled

[libbywblanton]

I have two fields on a form, we'll say A and B, and need to require that either A or B is filled out (but not necessarily both). So essentially, like a radio button, but for text fields. Any suggestions?

[try67]

"Require" in what sense, exactly?

[libbywblanton]

The same way that you can make a single field "required," I'd like to apply that to two fields but just require that one or the other is completed. It's actually for a W-4 that we're having new hires at our company complete, and we need to ensure that they either put in a withholding amount OR they complete the "Exempt" box.

[try67 · Accepted solution]

OK. Here's how I would do it. Define both fields as required and then use the following custom validation script in each one:

this.getField("Name of other field").required = (event.value=="");

event.target.required = true;

[libbywblanton]

Thank you!

[Luis27637397jomh]

Hello! Where do you type the validation in?

[Alexandra249730040agt]

Hi! I'm trying to use this formula but getting the error message "Invalid forumla expression. [Cursor Position 5]:
unknown function "."

Do you mind helping me figure out how to input the formula correctly?

[Alexandra249730040agt]

Hi! I'm trying to use this formula but getting the error message "Invalid forumla expression. [Cursor Position 5]:
unknown function "."

Do you mind helping me figure out how to input the formula correctly?