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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Well if the user does not click on the "Submit" button of the form, the input data will not be captured. All data which user has input will be lost.
Please be noted that it is possible to save the input data and complete the form or submit the form at a latter time. Here are the possible available options:
1. Enable Auto Fill: You can enable the "Auto Fill" setting of your form. It will save the input data every few seconds. User can close the form and some back latter, the input data will still be available. Please be noted that this feature uses the browser cookies to store the input data and if the browser cache is cleared, it will delete the saved data. The following guide should help you: http://www.jotform.com/help/227-How-to-Enable-Auto-Fill-Feature
2. Save input data in session: You can also save the data in session. The data will actually be saved on the server. This feature requires the form to have page break fields and click on the next button will save the data on server. The following guide should help you: http://www.jotform.com/help/97-How-to-Save-Forms-to-Continue-Later
Hope this helps.
Do get back to us if you have any questions.