How to get data from web services to display on NF?

Hi everyone,

I have a Nintex 2010 form. On the form, I have a field called Job Code. I need to allow users to enter some text in the field and click a button or some sort to validate the entered value is a correct job code. Our job codes are stored on a SQL server database. How can I validate the entered value with the SQL database values?

 The idea I have now is to use javascript to call a web service. But I don't know how to do this in Nintex.

Any ideas would be very much appreciated.

Thanks,

Jun