jQuery Form Plugin allows you to easily and unobtrusively upgrade HTML forms to use AJAX.
http://jquery.malsup.com/form/
JavaScript Libraries and Functions · jQuery Plugin
Get access to data on 11,415,686 websites that are jQuery Form Customers. We know of 2,331,740 live websites using jQuery Form and an additional 9,083,946 sites that used jQuery Form historically and 1,071,818 websites in the United States.
Get a list of 11,415,686 websites using jQuery Form which includes location information, hosting data, contact details, 2,331,740 currently live websites and an additional 943,859 domains that redirect to sites in this list. 9,083,946 sites that used this technology previously and 1,071,818 websites in the United States currently using jQuery Form.