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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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How to add modified source code as a lightbox on my websiteAsked by ruslanchik on November 07, 2014 at 02:31 PM
I do not think that we can combine a custom script with our LightBox embedding option.
You might consider using the form source code and your custom script on some separate website page. Then load that separate page via iFrame using any third party LightBox library/code.
If you need any further assistance, please let us know.