Why my JS giving null value error in Web?

Question

Its giving null value error when I fill the form and press submit button.
https://code.sololearn.com/WFe8ejTJ7jjK/?ref=app
Please run the code and help me with the error.

Answer 1

You use `document.write` which erases whatever already in the document. And that includes all your textboxes, and radio buttons. You can't refer to an object (e.g. using `getElementById`) that no longer exists.

Answer 2

I too actually want to know how can one avoid that condition as Ipang explained and display all that is submitted