Comments by Nicholas Lombardi (Top 5 by date)

First offending line is
let st1 = parsefloat(st1Element.value);

Hi Dave - there are two uncaught references both "parsefloat not defined" in the second function firstscreen_val and at the HTMLInputElement.onchange and HTMLInputElement.firstscreen_val.

No typos that I could see, the code for that and the first input text element is exactly the same, in the same position.

thanks for your help, Peter!

Yes, you hit the nail right on the head. I get a perfect INSERT statement. However, a nasty bug still persists Error: SQLSTATE[HY093]: Invalid parameter number: :well_no
I've been hearing that this error often crops up because PDO doesn't like duplicate column names appearing anywhere in the query. I'm trying to find if somehow my code is doing that behind the scenes. I'll have to research this error a bit further.