I have 2 DIV. They are linked forms.
First Div have 2 dropdowns for user input with a submit button. When user selects the submit button, another DIV will appear.
The first DIV will still remain there so users can change their input and the 2nd Div selection will also be updated once submit is selected. Hopefully someone can help!
I would like to see your approach on that. However, it's pretty simple. Just don't treat the button in first div as form submission.
Run only the validation for the first div on button click. And, have only one form through out. I don't see any reason to use multiple forms if you are allowing users to change content later.