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.

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    Any way to verify numbers entered on form?

    Asked by JeffreySmith on March 02, 2016 at 09:15 AM

    Are there any widgets or methods that can be used to compare and verify a number entry? Example, form has a field for user to enter a 4 digit random number. Once enter (i.e. 1234) this number can not be used again. Next user comes to form, enters (1234) message comes up stating this number has already been used. Is this possible?

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    JotForm Support

    Answered by EltonCris on March 02, 2016 at 10:54 AM

    This is possible using unique question limit. This feature checks if there is a duplicate entry on the same field upon submitting the form.

    Guide: http://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question

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    Answered by JeffreySmith on March 02, 2016 at 11:31 AM

    Thank you EltonCris, that is the information I needed!

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    Answered by JeffreySmith on March 03, 2016 at 03:36 PM

    I have added an unique question limit to form field. It works, but if the number is already taken, the message that warns the user is not seen until the form is submitted. Is there any way to have message appear before form submittal?

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    JotForm Support

    Answered by BJoanna on March 03, 2016 at 04:53 PM

    Unfortunately that is not possible to achieve. It is not possible to show warning message before form is submitted. 

    You can increase number of digits that your users need to enter, to lower that chance that same number is entered twice.  

    Feel free to contact us if you have any other questions.