Hello everyone:
I have a small app where the counter employees must enter a quantity field, this field could be anything from 0 to 1000; the most common entries are:

0.100 0.150 0.200 0.250 0.500 0.750 1.000 1.250 1.500 1.750 2.000
3.000 4.000 5.000 6.000 7.000 8.000 9.000 10.000 15.000 20.000 30.000
50.000 100.000 500.000 1000.000 Other

What I want is that they pick the quantity from a Table/Array/Menu or something because they are using a Tablet as an input device and with Touch Screen is something difficult to type digits when they are in a hurry and I want to simplify their job.

In the worst scenario, where a customer asks for a quantity not included in the Table/Aray/Menu the employee will have to type such a quantity.

The question is if I can do this with Javascript???
Any idea is welcome.
Thanks in advance.