Radio Button to make other field Mandatory

Question

I have two Radio Buttons that I want when clicked on (either one) to make a Number Field mandatory. I have viewed many websites on setting a mandatory field but the script I am using will not work. I have tried a couple ways of writing it but I seem to be missing something.
I have used this script in the Show of: click & change
Here is the script that I'm using right now.
if  (this.rawValue==1)   
AssemblyNu-1.mandatory ="error";
else
AssemblyNu-1.mandatory ="disabled";
And this one:
if (this.rawValue==2)
AssemblyNu-1.mandatory ="error";
else
AssemblyNu-1.mandatory ="disabled";
Thanks,
HHud5757

Answer 1

So, I put a quick form together to test your code.
On the change event of the radio button list (not the radio button itself), I added:
if (this.rawValue == 1) tfTest.mandatory = "error";
else tfTest.mandatory = "disabled";
In my case, the radio button with the value of 1 is the one I want to make the field mandatory. If you want either button to make it mandatory, then use:
if (this.rawValue == 1 || this.rawValue == 2) tfTest.mandatory = "error";