Hi,

Is this something in use already?

No sorry.

Or some new feature request?

Unfortunately we consider something like this a bit too complex and not very useful.

How to do:
I think the best way is to use javascript; each option have ID like this "jform_alias-of-field0", so for example field with alias "test" with Yes and No have these IDs for these options
Yes - jform_test0
No - jform_test1

You can write javascript like this to render a message when Yes is checked:

jQuery(document).ready(function($){

	$("#jform_test0").change(function(){

		if($(this).is(":checked")) alert("your message");

	});

});

with this code for example when you click on Yes you will see a message with "your message" text.

Hi there,

I'm trying to use this option, but with no results. Because all of them are wrapped in a div ".control-group" with no ID.

The best I can do is hide the field and not the all div... like the image.

The idea is to hide all that div if the above field is set to "No".

Thanks in advance!

The idea is to hide all that div if the above field is set to "No".

Hi,
to do this you can use conditions of field "Cigarros Electronicos":
if equal to custom value "1" (or value for Yes*) show "Marca Cigarros Electronicos" fields

* I assume you have these options in "Cigarros Electronicos" field:
0|NO
1|YES