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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    "custom" validation of form fields

    Asked by jczgoogl on August 14, 2015 at 03:07 PM

    Is there a way to use Javascript or something to create customized data validation of form entries?


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    Answered by Boris on August 14, 2015 at 05:37 PM

    I am sorry, but we do not allow embedding any JavaScript into our forms. In order to add special JavaScript into our forms, you would need to download the source code of your form and add your scripts into it manually.

    If you are looking for a way to ensure that your users are entering a specifically crafted code, such as a license plate or a similar predictable combination of letters and numbers, you can use an Input Mask to control what can be entered:

    I hope this helps. Please let us know if you need further assistance.