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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Are you asking to have your field accepting only numeric values?
Doing so will make that field like this:
Or you can also use the Number field from Quick Tools of the side panel of your Form Builder.
This automatically required form-submitters to enter a number. Entering a number from the keyboard will not make any effect at all (or there will be no input written on the field if it is not a number).
I hope this helps. Let us know if you need any further assistance. Thank you.