Validate Button Click and Text Box

I have a button that checks the database for existing data, I want to stop commit if this button is not clicked. I used a javascript routine to check, it is called on On Form Submission.

It does validate but GRAYs out the submit button once validated.

Also I want to be able to stop submit or commit this same form, if an item has been selected from a dropdown control, the next text box MUST be completed.

All my javascript efforts has not be able to achieve this two validations on the same form.

Please point me to an example or reference I could read up.

Thanks in advance.

Forum: Designer