old_contents: /* require XLSX */
  var XLSX = require('XLSX')
  
  document.body.addEventListener('click', function (event) {
    if (event.target.dataset.submit) {
      submit(event)    
    } 
  })
  
  function submit (e) {
    var form = document.querySelectorAll('form')[0];
    console.log(form);
    saveXLSX();
    e.preventDefault();
  }
  
  function saveXLSX() {
    /* original data */
    var data = [[1,2,3],[true, false, null, "sheetjs"],["foo","bar",new Date("2014-02-19T14:30Z"), "0.3"], ["baz", null, "qux"]]
    var ws_name = "SheetJS";
  
    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
  
    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;
  
    /* write file */
    XLSX.writeFile(wb, 'd://test.xlsx');
  }
  
  function datenum(v, date1904) {
  	if(date1904) v+=1462;
  	var epoch = Date.parse(v);
  	return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
  }
  
  function sheet_from_array_of_arrays(data, opts) {
  	var ws = {};
  	var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
  	for(var R = 0; R != data.length; ++R) {
  		for(var C = 0; C != data[R].length; ++C) {
  			if(range.s.r > R) range.s.r = R;
  			if(range.s.c > C) range.s.c = C;
  			if(range.e.r < R) range.e.r = R;
  			if(range.e.c < C) range.e.c = C;
  			var cell = {v: data[R][C] };
  			if(cell.v == null) continue;
  			var cell_ref = XLSX.utils.encode_cell({c:C,r:R});
  			
  			if(typeof cell.v === 'number') cell.t = 'n';
  			else if(typeof cell.v === 'boolean') cell.t = 'b';
  			else if(cell.v instanceof Date) {
  				cell.t = 'n'; cell.z = XLSX.SSF._table[14];
  				cell.v = datenum(cell.v);
  			}
  			else cell.t = 's';
  			
  			ws[cell_ref] = cell;
  		}
  	}
  	if(range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  	return ws;
  }
  
  function Workbook() {
  	if(!(this instanceof Workbook)) return new Workbook();
  	this.SheetNames = [];
  	this.Sheets = {};
  }
new_contents: /* require XLSX */
  var XLSX = require('XLSX')
  
  document.body.addEventListener('click', function (event) {
    if (event.target.dataset.submit) {
      submit(event)    
    } 
  })
  
  function submit (e) {
    var form = document.querySelectorAll('form')[0];
    console.log(form);
    saveXLSX();
    e.preventDefault();
  }
  
  function saveXLSX() {
    /* original data */
    var data = [[1,2,3],[true, false, null, "sheetjs"],["foo","bar",new Date("2014-02-19T14:30Z"), "0.3"], ["baz", null, "qux"]]
    var ws_name = "SheetJS";
  
    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
  
    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;
  
    /* write file */
    XLSX.writeFile(wb, 'test.xlsx');
  }
  
  function datenum(v, date1904) {
  	if(date1904) v+=1462;
  	var epoch = Date.parse(v);
  	return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
  }
  
  function sheet_from_array_of_arrays(data, opts) {
  	var ws = {};
  	var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
  	for(var R = 0; R != data.length; ++R) {
  		for(var C = 0; C != data[R].length; ++C) {
  			if(range.s.r > R) range.s.r = R;
  			if(range.s.c > C) range.s.c = C;
  			if(range.e.r < R) range.e.r = R;
  			if(range.e.c < C) range.e.c = C;
  			var cell = {v: data[R][C] };
  			if(cell.v == null) continue;
  			var cell_ref = XLSX.utils.encode_cell({c:C,r:R});
  			
  			if(typeof cell.v === 'number') cell.t = 'n';
  			else if(typeof cell.v === 'boolean') cell.t = 'b';
  			else if(cell.v instanceof Date) {
  				cell.t = 'n'; cell.z = XLSX.SSF._table[14];
  				cell.v = datenum(cell.v);
  			}
  			else cell.t = 's';
  			
  			ws[cell_ref] = cell;
  		}
  	}
  	if(range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  	return ws;
  }
  
  function Workbook() {
  	if(!(this instanceof Workbook)) return new Workbook();
  	this.SheetNames = [];
  	this.Sheets = {};
  }
subject: modify path