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.

  • Profile Image

    MultiSelect Grid - How do you ensure a time slot is only selected once, or tells the user if it's already been picked after their submission?

    Asked by bigmachine on August 09, 2016 at 06:14 PM

    We're using this form to book times for radio interviews....if one station and another station both select the same open time and submit, the form allows this. The user has no way of knowing another user just booked that time out from under them, unless they refresh the page. How do we make it throw an error after submission if this happens saying something like "Too slow! That time slot was selected by another station before you hit submit. Click here to return to the form."

    Page URL:

  • Profile Image
    JotForm Support

    Answered by liyam on August 09, 2016 at 09:19 PM

    Hello bigmachine,

    I see that you have managed to find a solution to your concern. Now in order to change your form warnings, you should go to the Preferences of your form (Right most upper tool bar)

    Next, under general tab, click Add on the Form Warnings settings.

    Find the "Sorry! Only one entry is allowed.  Multiple submissions are disabled for this form." Change the text, click Finish and click the Save Changes button

    Once done, if the field selected is no longer available, you should see your modified form warning changes.

    If you have questions, please let us know.


  • Profile Image

    Answered by bigmachine on August 11, 2016 at 06:26 PM

    Actually we haven't found a solution! I'm still able to pick the same time if I use different browsers or tabs. I tried using a hidden field, but it didn't solve the issue and is still letting me submit twice for the same time. Any ideas how to fix this or a workaround - even if it's complicated?

  • Profile Image
    JotForm Support

    Answered by liyam on August 11, 2016 at 08:59 PM

    Hello bigmachine,

    Currently, when I try to make a submission using the same selected time slot, I get an error:

    Can you confirm that this is not happening on your end?


  • Profile Image

    Answered by bigmachine on September 12, 2016 at 12:46 PM

    This is not happening on our end. If we select a time slot in two different browsers, it let's us submit both and doesn't show the warning, thus creating a scheduling conflict.

  • Profile Image
    JotForm Support

    Answered by BDAVID on September 12, 2016 at 02:09 PM

    I just cloned the form, and loaded the cloned version in two browsers, then selected the same option, I submitted one form first and the other a second after:

    As you can see, the warning showed up. You can change the warning message: https://www.jotform.com/help/61-How-to-Change-Form-Warnings 

    Let us know if you need more help.