is there any way to write a signature on a form before clicking submit?

Hi,

We actually have several widgets that will allow your users to sign directly in the form.  Here is a link to the list:

http://widgets.jotform.com/search/signature

Personally, I think smooth signature tends to work the best.

http://widgets.jotform.com/widget/smooth_signature

If you have any further questions, let us know and we will be happy to help.