using ajax and jquery to insert or update to database

Hi, check out this thread, I wrote a good example there: https://forum.codeigniter.com/thread-76104.html
Obviously, you can omit the csrf cookie stuff in case you're not using it, or how my script reacts based on the submit button clicked (if you have more than one submit button in form)

You can see things I made with codeigniter here: itart.pro its not overly impressive as I have very little time to learn.