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You must update the Record with the values entered into the input boxes. Use a formatter to restore the value from the Record into the input box.

The paginator redraws all the HTML based on the information on the Record. Whatever is not in the Record it is gone.

You can save any field into the Record regardless of whether it had been declared before or not. If you use Record's setData method with a previously unknown field name, that field will be created.

The fields you declare on the DataSource just tell the DataSource which fields to fetch, parse and pass on to the DataTable, it does not restrict the DataTable to those fields. Likewise, the columns you declare in the columns definitions tell the DataTable what columns to show, but there might be more or fewer columns than fields in the Record.

You may choose to listen to Paginator's changeRequest event and make sure to update all the fields in the record before the page does change or keep updating the record for every keystroke on the fields.

If you are creating a new Record instance apart of the DataTable, don't expect it to know anything about it. You have to modify the Record instances in the RecordSet associated to the DataTable.

You are trying to write some advanced stuff and it seems you are not well acquainted with DataTable. Why don't you read the two-part article recommended at the very top of the DataTable User Guide?

Part of the answer is still valid: have you read those two tutorials? Otherwise, if you can post a working copy somewhere: fiddle.net, or just the code in a gist or pastebin, that would be great.