Is it possible to update live a field and the responding fields in WebShop?

I've the following Problem:

There is a requested Name and during changing the Name the Technical Name has to be changed as well. How can that be done?

On the popup I've only the two fields "Requested Name" and "Technical Name" and also "ok" and "Cancel" button. The user must see the technical Name before he can say ok. The normal script tag for this is "onChange". Is there any way to do this?