JS To Retrieve Data From DB?

We are trying to develop an Engineering application using PHP,
Javascript with Informix as the back-end.

Is it possible to retrieve data using Javascript but by accessing the
Database. Say somebody enters part_no, than using Javascript is it
possible to connect to the part master and retrieve the division and
desc information?

I am not allowed to use the PHP because this will require the user to
insert the part number on the first page (user input page) and then
retrieve the information using PHP and display the info on the second
page (processing page).

I will need this to be done on the same page. That means the info will
need to be retrieved instantly (on the fly).

I think of building a javascript array for the part master table using
PHP but finally decided not to as the table is a huge table (contains
more than 1000000 records).