refresh JSON datasource (form search result) without using ajax

Hi, I have a search form that execute using ajax and return a JSON object (list) but can't figure out how to refresh the table with the new result, the table initially is empty,

I saw the custom var example http://datatables.net/examples/server_side/custom_vars.html but I don't want the dataTable to do the ajax request (unless there is a way to make my submit-search button trigger refresh on the table and make it pick my form values automatically ?)

thanks