4.5 KiB
4.5 KiB
Parsing Workbooks
For parsing, the first step is to read the file. This involves acquiring the data and feeding it into the library. Here are a few common scenarios:
nodejs read a file (click to show)
if(typeof require !== 'undefined') XLSX = require('xlsx');
var workbook = XLSX.readFile('test.xlsx');
/* DO SOMETHING WITH workbook HERE */
Browser read TABLE element from page (click to show)
var worksheet = XLSX.utils.table_to_book(document.getElementById('tableau'));
/* DO SOMETHING WITH workbook HERE */
Browser download file (ajax) (click to show)
Note: for a more complete example that works in older browsers, check the demo at http://oss.sheetjs.com/js-xlsx/ajax.html):
/* set up XMLHttpRequest */
var url = "test_files/formula_stress_test_ajax.xlsx";
var oReq = new XMLHttpRequest();
oReq.open("GET", url, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(e) {
var arraybuffer = oReq.response;
/* convert data to binary string */
var data = new Uint8Array(arraybuffer);
var arr = new Array();
for(var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
var bstr = arr.join("");
/* Call XLSX */
var workbook = XLSX.read(bstr, {type:"binary"});
/* DO SOMETHING WITH workbook HERE */
}
oReq.send();
Browser drag-and-drop (click to show)
Drag-and-drop uses FileReader with readAsBinaryString or readAsArrayBuffer. Note: readAsBinaryString and readAsArrayBuffer may not be available in every browser. Use dynamic feature tests to determine which method to use.
/* processing array buffers, only required for readAsArrayBuffer */
function fixdata(data) {
var o = "", l = 0, w = 10240;
for(; l<data.byteLength/w; ++l) o+=String.fromCharCode.apply(null,new Uint8Array(data.slice(l*w,l*w+w)));
o+=String.fromCharCode.apply(null, new Uint8Array(data.slice(l*w)));
return o;
}
var rABS = true; // true: readAsBinaryString ; false: readAsArrayBuffer
/* set up drag-and-drop event */
function handleDrop(e) {
e.stopPropagation();
e.preventDefault();
var files = e.dataTransfer.files;
var i,f;
for (i = 0; i != files.length; ++i) {
f = files[i];
var reader = new FileReader();
var name = f.name;
reader.onload = function(e) {
var data = e.target.result;
var workbook;
if(rABS) {
/* if binary string, read with type 'binary' */
workbook = XLSX.read(data, {type: 'binary'});
} else {
/* if array buffer, convert to base64 */
var arr = fixdata(data);
workbook = XLSX.read(btoa(arr), {type: 'base64'});
}
/* DO SOMETHING WITH workbook HERE */
};
if(rABS) reader.readAsBinaryString(f);
else reader.readAsArrayBuffer(f);
}
}
drop_dom_element.addEventListener('drop', handleDrop, false);
Browser file upload form element (click to show)
/* fixdata and rABS are defined in the drag and drop example */
function handleFile(e) {
var files = e.target.files;
var i,f;
for (i = 0; i != files.length; ++i) {
f = files[i];
var reader = new FileReader();
var name = f.name;
reader.onload = function(e) {
var data = e.target.result;
var workbook;
if(rABS) {
/* if binary string, read with type 'binary' */
workbook = XLSX.read(data, {type: 'binary'});
} else {
/* if array buffer, convert to base64 */
var arr = fixdata(data);
workbook = XLSX.read(btoa(arr), {type: 'base64'});
}
/* DO SOMETHING WITH workbook HERE */
};
reader.readAsBinaryString(f);
}
}
input_dom_element.addEventListener('change', handleFile, false);
Parsing Examples
- http://oss.sheetjs.com/js-xlsx/ HTML5 File API / Base64 Text / Web Workers
Note that older versions of IE do not support HTML5 File API, so the base64 mode is used for testing.
Get base64 encoding on OSX / Windows (click to show)
On OSX you can get the base64 encoding with:
$ <target_file base64 | pbcopy
On Windows XP and up you can get the base64 encoding using certutil:
> certutil -encode target_file target_file.b64
(note: You have to open the file and remove the header and footer lines)
- http://oss.sheetjs.com/js-xlsx/ajax.html XMLHttpRequest