Script to detect when a radio button is clicked/ digital signature signed

Question

Good afternoon,
What is the syntax to detect if a radio button is clicked or a digital signature field is signed?
What I want to do is populate a field if a radiobox is clicked and a the user digitially signs the form.
My radio boxes follow the scheme
Group name: Group 1
Choice name: A,B, C, D
Digital signater field name: boss
Proposed script
if ( group1.A==True and this.getField("boss').signed){
     this.getField("x").value = thisgetField("y").value
I know the syntax is way off but I am trying to fufil a task like thie one described above.

Answer 1

Try67
Thanks
That works. Follow on question:
When I digitally sign,  I am trying to get that digital signature to permeate to other digital signature blocks. I am trying to modify your code to do this once the document is digitally signed but it is giving me a syntax error:
if ( this.getField("MainCheckbox").value=="Choice1" && this.getField("Signature155").value!="" {
     this.getField("Signature15").value! = this.getField("Signature155").value!;
    }else this.GetField("Signature15").value = "";
How to I fix that?
Also,  I am trying to d othe same with radio boxes; however, radio boxes do not have an option to run a script once they are checked.