Get HTML table data as a CSV formatted string

table-to-csv.js

function tableAsCsv(id) {
  // Make sure table exists and contains at least 1 row
  if (document.getElementById(id) == null || document.getElementById(id).rows[0] == null) {
    return;
  }
		
  // Get reference to table & number of rows
  var tbl = document.getElementById(id);
  var numRows = tbl.rows.length;
		
  // Iterate table and build formatted csv string
  var result = '';
  for (var i = 0; i < numRows; i++) {
    for (var j = 0; j < tbl.rows[i].cells.length; j++) {
      result += tbl.rows[i].cells[j].innerHTML;
      result += ",";
    }
    result += "\n";
  }
  
  return result;
}