How do I set up a mandatory on a dropdowm list, in its 2nd list?

[Joan_Rivero]

How do I set up a mandatory on a dropdowm list, in its 2nd list?

Example:

In a custom field, being a dropdowm list I have 2 options:

1st dropdowm list (This field is mandatory in the form)
Option 1 - Mexico
Option 2 - USA

The 1st dropdown list is related to the 2nd one -

2nd dropdowm List (I want to make this field required)
Mexico: - Mexico DF
- Guadalajara

USA: - Florida
- Texas

The idea is that both detachable lists are mandatory within the form. How can you help me to solve this problem?

Thank you very much for your time

[Mikael Sandberg · Accepted solution]

If you want to do this within a Form this is how I would do it. I would create a conditional section that is based on the value selected in the first dropdown, that way the second dropdown will only be shown if the first one has the value that is selected for the section. Something like this:

This would mean that the State field will only be visible if USA is selected. You can make the State field required, but it would only be required if the section is visible.