How to add price sepator?

[Tim Copper]

This page may help, although I have no real coding experience with regard to how to implement it into Flynax script.

https://codepen.io/nfisher/pen/YYJoYE

Hi Graham, thank you for the reference. I just looked at it and it still a bit off from my need. I need the system to add separator "," for thousands in the price field, in focus, while user typing. So they can see what they are inputing:
1,000,000.

In your reference, user still see 1000000 instead of 1,000,000. They can see 1,000,000 when the field is out focus.