From json to sheet.

Hi guys, thanks for the wonderful work on this module.

Some quick questions:

1. How to iterate on the sheet’s rows? Right now i’m using the sheet_to_json utility…
2. Is there a way to get a sheet from the JSON? Like a json_to_sheet utility. To be able to write back the changed xls to the file.

Thanks

[jomel]

@samuelkavin I use something like this to create a xlsx file from json and send it as a response to a web request:

const XLSX = require('xlsx');
data = [ { "agentNo":"324234", "subName":"30, Jul 2013 09:24 AM" }, { "agentNo":"444443", "subName":"30, Jul 2013 09:24 AM" } ];

/* create workbook & set props*/
   const wb = { SheetNames: [], Sheets: {} };
   wb.Props = {
      Title: "Stats from app",
      Author: "John Doe"
   };

/*create sheet data & add to workbook*/
var ws = XLSX.utils.json_to_sheet(data);
var ws_name = "DataSheet 1";
XLSX.utils.book_append_sheet(wb, ws, ws_name);

/* create file 'in memory' */
var wbout = new Buffer(XLSX.write(wb, { bookType: 'xlsx', type: 'buffer' }));

/* send it by web request - where app is express()*/
app.get('/api/jobs/download', (req, res) => {
   var filename = "myDataFile.xlsx";
   res.setHeader('Content-Disposition', 'attachment; filename=' + filename);
   res.type('application/octet-stream');
   res.send(wbout);
}

[SheetJSDev]

@roccomuso Here’s a simple function, we should add a more refined version of this to the library in the next release:

function json_to_sheet(js/*:Array<any>*/, opts)/*:Worksheet*/ {
	var o = opts || {};
	var ws = ({}/*:any*/);
	var range/*:Range*/ = ({s: {c:0, r:0}, e: {c:0, r:js.length}}/*:any*/);
	var hdr = o.header || [], C = 0;

	for(var R = 0; R != js.length; ++R) {
		Object.keys(js[R]).filter(function(x) { return js[R].hasOwnProperty(x); }).forEach(function(k) {
			if((C=hdr.indexOf(k)) == -1) hdr[C=hdr.length] = k;
			var v = js[R][k];
			var t = 'z';
			if(typeof v == 'number') t = 'n';
			else if(typeof v == 'boolean') t = 'b';
			ws[XLSX.utils.encode_cell({c:C,r:R+1})] = {t:t, v:v};
		});
	}
	range.e.c = hdr.length - 1;
	for(C = 0; C < hdr.length; ++C) ws[XLSX.utils.encode_col(C) + "1"] = {t:'s', v:hdr[C]};
	ws['!ref'] = XLSX.utils.encode_range(range);
	return ws;
}