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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    How to Avoid Multiple and 'Time-Travelling' Submissions?

    Asked by BeliBeli24 on June 05, 2017 at 07:08 PM

    Hi!

    #1. Sometimes we got multiple submission from the same person within seconds (with the exact same info, suggesting he/she refreshed or hit the Submit button twice? It occurs like 10% of the submission). How can we prevent this, but still allowing the same user to submit another submission later (the next day, next week etc).

     

    #2. We have had submissions from 11:30AM, legit and verified. Then, around 10-11PM the same submission came in again which are duplicates from 11:30AM. This is just an example, the time varies. How can we prevent this?*

    *We tried recaptcha (not so user friendly though when the image selection pops up, are there easier alternatives? Maybe a required checkbox widget which clears upon submission or refresh?) The recaptcha seems to work in preventing the time-travelling orders. But it won't prevent the issue #1.
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    JotForm Support

    Answered by ashwin_d on June 05, 2017 at 11:24 PM

    Hello BeliBeli24,

    Please note that it is possible to prevent users from submitting multiple submissions and here are the options available:

    #1. Unique Submission: You can take advantage of our unique submission feature to block multiple submissions from one system of one IP address by setting the "Check Cookies Only (Loose check)" or "Check Cookies & IP address (Strict Check)" respectively. Here is a guide to help you set unique submission:  http://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form 

    #2. Unique Question: You can also use our unique question feature to prevent from submitting duplicate submissions. Example: You can set one of your forms question (like cell number or email address) to be a unique question. This will not allow a user to use the same cell number or email address to submit your form. Here is a guide to help you:  http://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question 

    Unfortunately both the options will not allow users to submit form again the next date, next week etc. If you enable unique submission with "Check Cookies Only (Loose check)", user will have to clear browser cache before submitting the form again.

    I have moved your second question to a new thread so that we can address it separately. You will be answered in the following thread:  https://www.jotform.com/answers/1164292

    Thank you!