Jquery UI自动完成此操作，不作为单独的参数传递id

So I am trying to pass another parameter "field" which will let me grab the id of the input that is being typed in. This would allow me to direct the PHP to make the proper SQL statement to the database as i will have multiple inputs on a page that need autocomplete to work. I know that below is missing the response and that is because i wasn't exactly sure what to put. I just want to return the json string like normal. How can i get the id to be passed as well as what do i put for the response?So I am trying to pass another parameter "field