sheetjs/demos/requirejs/requirejs.js

require(["xlsx.full"], function(_XLSX) {
var X = XLSX;

var rABS = typeof FileReader !== "undefined" && typeof FileReader.prototype !== "undefined" && typeof FileReader.prototype.readAsBinaryString !== "undefined";
if(!rABS) {
	document.getElementsByName("userabs")[0].disabled = true;
	document.getElementsByName("userabs")[0].checked = false;
}

var wtf_mode = false;

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;
}

function ab2str(data) {
	var o = "", l = 0, w = 10240;
	for(; l<data.byteLength/w; ++l) o+=String.fromCharCode.apply(null,new Uint16Array(data.slice(l*w,l*w+w)));
	o+=String.fromCharCode.apply(null, new Uint16Array(data.slice(l*w)));
	return o;
}

function s2ab(s) {
	var b = new ArrayBuffer(s.length*2), v = new Uint16Array(b);
	for (var i=0; i != s.length; ++i) v[i] = s.charCodeAt(i);
	return [v, b];
}

function get_radio_value( radioName ) {
	var radios = document.getElementsByName( radioName );
	for( var i = 0; i < radios.length; i++ ) {
		if( radios[i].checked || radios.length === 1 ) {
			return radios[i].value;
		}
	}
}

function to_json(workbook) {
	var result = {};
	workbook.SheetNames.forEach(function(sheetName) {
		var roa = X.utils.sheet_to_json(workbook.Sheets[sheetName]);
		if(roa.length > 0){
			result[sheetName] = roa;
		}
	});
	return result;
}

function to_csv(workbook) {
	var result = [];
	workbook.SheetNames.forEach(function(sheetName) {
		var csv = X.utils.sheet_to_csv(workbook.Sheets[sheetName]);
		if(csv.length > 0){
			result.push("SHEET: " + sheetName);
			result.push("");
			result.push(csv);
		}
	});
	return result.join("\n");
}

function to_formulae(workbook) {
	var result = [];
	workbook.SheetNames.forEach(function(sheetName) {
		var formulae = X.utils.get_formulae(workbook.Sheets[sheetName]);
		if(formulae.length > 0){
			result.push("SHEET: " + sheetName);
			result.push("");
			result.push(formulae.join("\n"));
		}
	});
	return result.join("\n");
}

var tarea = document.getElementById('b64data');
function b64it() {
	if(typeof console !== 'undefined') console.log("onload", new Date());
	var wb = X.read(tarea.value, {type: 'base64',WTF:wtf_mode});
	process_wb(wb);
}

function process_wb(wb) {
	var output = "";
	switch(get_radio_value("format")) {
		case "json":
			output = JSON.stringify(to_json(wb), 2, 2);
			break;
		case "form":
			output = to_formulae(wb);
			break;
		default:
			output = to_csv(wb);
	}
	if(out.innerText === undefined) out.textContent = output;
	else out.innerText = output;
	if(typeof console !== 'undefined') console.log("output", new Date());
}

var drop = document.getElementById('drop');
function handleDrop(e) {
	e.stopPropagation();
	e.preventDefault();
	rABS = document.getElementsByName("userabs")[0].checked;
	var files = e.dataTransfer.files;
	var f = files[0];
	{
		var reader = new FileReader();
		var name = f.name;
		reader.onload = function(e) {
			if(typeof console !== 'undefined') console.log("onload", new Date(), rABS);
			var data = e.target.result;
			{
				var wb;
				if(rABS) {
					wb = X.read(data, {type: 'binary'});
				} else {
					var arr = fixdata(data);
					wb = X.read(btoa(arr), {type: 'base64'});
				}
				process_wb(wb);
			}
		};
		if(rABS) reader.readAsBinaryString(f);
		else reader.readAsArrayBuffer(f);
	}
}

function handleDragover(e) {
	e.stopPropagation();
	e.preventDefault();
	e.dataTransfer.dropEffect = 'copy';
}

if(drop.addEventListener) {
	drop.addEventListener('dragenter', handleDragover, false);
	drop.addEventListener('dragover', handleDragover, false);
	drop.addEventListener('drop', handleDrop, false);
}


var xlf = document.getElementById('xlf');
function handleFile(e) {
	rABS = document.getElementsByName("userabs")[0].checked;
	var files = e.target.files;
	var f = files[0];
	{
		var reader = new FileReader();
		var name = f.name;
		reader.onload = function(e) {
			if(typeof console !== 'undefined') console.log("onload", new Date(), rABS);
			var data = e.target.result;
			{
				var wb;
				if(rABS) {
					wb = X.read(data, {type: 'binary'});
				} else {
					var arr = fixdata(data);
					wb = X.read(btoa(arr), {type: 'base64'});
				}
				process_wb(wb);
			}
		};
		if(rABS) reader.readAsBinaryString(f);
		else reader.readAsArrayBuffer(f);
	}
}

if(xlf.addEventListener) xlf.addEventListener('change', handleFile, false);

});