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

    Empty hidden fields filled from URL params

    Asked by optimed on October 16, 2014 at 03:21 PM

    Hey guyz,

    I have a form on most pages of my websites which autofill hidden fields (Brand, Model etc...) from the URL parameters of the form.

    Once every 4 or 5 times, the 4 hidden fields are empty...?

    Any ideas?

    Page URL:

  • Profile Image
    JotForm Support

    Answered by david on October 16, 2014 at 04:27 PM


    Could you please give us an example of the URL you are using to populate the form?  With that information, we can test the exact setup you are using to pre-populate and see if we are able to reproduce the issue of the hidden fields not being populated.  We also would like to make sure the values are being properly passed.  Let us know and we will be happy to take a closer look.

  • Profile Image

    Answered by optimed on October 16, 2014 at 04:45 PM


    I am using the code given by JotForm:

    <script type="text/javascript" src="http://form.jotformpro.com/jsform/41465915421958?marque=Titan&grandeur=44X18.00X20&modele=T44&description=44X18.00-20 TITAN T-44"></script>

    I am using parameter to prepopulate the field. It is working on and off...
  • Profile Image
    JotForm Support

    Answered by david on October 16, 2014 at 05:10 PM

    Thank you very much for that information.  I was able to modify your link to fit my cloned version of your form.  Each submission I made did include the information from the URL:



    I tried several submissions and each time the information was indeed included.  The only thing I can think of the the javascript embed may be having some page conflicts that occasionally cause the URL parameters not to be loaded into the form.

    The only thing I can recommend is trying the iFrame embed method to see if you get more consistent results:


    Other than that, I am unsure why the parameters are not being sent every time.  They were with my version of the form, however my version is standalone and not embedded to a page.


  • Profile Image

    Answered by optimed on October 16, 2014 at 05:14 PM


    Just to let you know, I selected randomly 25 pages a few weeks ago and I posted the info... Everything was there on my side.

    I just can't figure out why I get some submission without the info! :S Are you able to check in my submission the one that have these 4 fields blank and check their browser or something?

  • Profile Image
    JotForm Support

    Answered by Welvin on October 16, 2014 at 06:09 PM

    I would say the same, I think a conflict between the form script and your website script is causing the problem to the form.

    Re-embedding the form using our iFrame method would fix it. iFrame is recommended when there's a conflict to the page. Please try that and let us know if the issue persists.

    Thank you!