xsheetjs/docbits/30_export.md

Writing Workbooks

For writing, the first step is to generate output data. The helper functions write and writeFile will produce the data in various formats suitable for dissemination. The second step is to actual share the data with the end point. Assuming workbook is a workbook object:

nodejs write a file (click to show)

XLSX.writeFile uses fs.writeFileSync in server environments:

if(typeof require !== 'undefined') XLSX = require('xlsx');
/* output format determined by filename */
XLSX.writeFile(workbook, 'out.xlsb');
/* at this point, out.xlsb is a file that you can distribute */

Browser add TABLE element to page (click to show)

The sheet_to_html utility function generates HTML code that can be added to any DOM element.

var worksheet = workbook.Sheets[workbook.SheetNames[0]];
var container = document.getElementById('tableau');
container.innerHTML = XLSX.utils.sheet_to_html(worksheet);

Browser upload file (ajax) (click to show)

A complete example using XHR is included in the XHR demo, along with examples for fetch and wrapper libraries. This example assumes the server can handle Base64-encoded files (see the demo for a basic nodejs server):

/* in this example, send a base64 string to the server */
var wopts = { bookType:'xlsx', bookSST:false, type:'base64' };

var wbout = XLSX.write(workbook,wopts);

var req = new XMLHttpRequest();
req.open("POST", "/upload", true);
var formdata = new FormData();
formdata.append('file', 'test.xlsx'); // <-- server expects `file` to hold name
formdata.append('data', wbout); // <-- `data` holds the base64-encoded data
req.send(formdata);

Browser save file (click to show)

XLSX.writeFile wraps a few techniques for triggering a file save:

• URL browser API creates an object URL for the file, which the library uses by creating a link and forcing a click. It is supported in modern browsers.
• msSaveBlob is an IE10+ API for triggering a file save.
• IE_FileSave uses VBScript and ActiveX to write a file in IE6+ for Windows XP and Windows 7. The shim must be included in the containing HTML page.

There is no standard way to determine if the actual file has been downloaded.

/* output format determined by filename */
XLSX.writeFile(workbook, 'out.xlsb');
/* at this point, out.xlsb will have been downloaded */

Browser save file (compatibility) (click to show)

XLSX.writeFile techniques work for most modern browsers as well as older IE. For much older browsers, there are workarounds implemented by wrapper libraries.

FileSaver.js implements saveAs. Note: XLSX.writeFile will automatically call saveAs if available.

/* bookType can be any supported output type */
var wopts = { bookType:'xlsx', bookSST:false, type:'array' };

var wbout = XLSX.write(workbook,wopts);

/* the saveAs call downloads a file on the local machine */
saveAs(new Blob([wbout],{type:"application/octet-stream"}), "test.xlsx");

Downloadify uses a Flash SWF button to generate local files, suitable for environments where ActiveX is unavailable:

Downloadify.create(id,{
	/* other options are required! read the downloadify docs for more info */
	filename: "test.xlsx",
	data: function() { return XLSX.write(wb, {bookType:"xlsx", type:'base64'}); },
	append: false,
	dataType: 'base64'
});

The oldie demo shows an IE-compatible fallback scenario.

The included demos cover mobile apps and other special deployments.

Writing Examples

• http://sheetjs.com/demos/table.html exporting an HTML table
• http://sheetjs.com/demos/writexlsx.html generates a simple file