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.
<a target="_blank" href="***" onclick="****">download</a>
You will need to use the full source code embed of your jotform to be able to add custom scripts function.
However, depending on what you wanted to achieve, you may not need to use custom OnClick event just to have download link.. you can just add a link instead or a redirect URL upon form submit.
If you can provide us more details what it is you wanted to do, we will be able give further suggestion.