I´m not sure if I understand your workflow correctly but how about this: for every row processed send a small JSON documents to the browser which contains information on the worksheet, row and row status and then have some JavaScript code in the browser assemble and update the correct HTML table (inserting another row)? I´d probably render a skeleton HTML page as response to the upload of the Excel file, then start a new AJAX request from that page which triggers the processing of the spreadsheet uploaded previously and receives the processing status as "server-sent events" (cf. http://www.w3.org/TR/eventsource/).
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