What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Try the steps below, provided on this thread
2. Embed/Add the form using source code to your website page.
3. Add your script to that same page where the form was embedded.
Example page (this is from another supporter old sample page)
Put numbers on "Chicken" or "Mutton Briyani" field and you will see the "total" field calculates
Hope this help. Inform us if you need further assistance.