What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
sequential invoice numberAsked by coxtech on September 09, 2014 at 09:14 PM
I am not sure if I have understood your question correctly. We have received an empty response from you with just the title as "sequential invoice number".
Do you want to generate a sequential number after every form is submitted? Yes it is possible to achieve your requirement. You can add "Unique ID" widget in your form which will generate a unique number for every submissions. It is also possible to customize the number by adding prefix and padding numbers as well. The following guide should help you: http://www.jotform.com/help/79-Add-Custom-Unique-IDs-to-your-Form-Submissions
Hope this helps.
Do get back to us if you have any questions.