How to prevent duplicated submissions

How do I prevent multiple submissions from the same computer?

My employees submit the form:

http://atfgyms.com/tourwaiver/

And sometimes they will hit the submit button multiple times, and will create duplicate submissions.  How do I avoid this?  Thank you!

I do not think that we have a mechanism to block the duplicated data. However, we disable the form Submission button once it is pressed.

Since you use a custom code to validate and submit your form, can you try to disable the form submit button once it is clicked once?

I have also submitted a ticket to our Development Team to see if we can add functionality to disable the duplicated submissions at some point.

Thank you.