docs.sheetjs.com/docz/static/nwjs/index.html

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<!DOCTYPE html>
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<!-- sheetjs (C) 2013-present SheetJS https://sheetjs.com -->
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<!-- vim: set ts=2: -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta name="robots" content="noindex">
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<title>SheetJS NW.js Demo</title>
<style>
#drop{
border:2px dashed #bbb;
-moz-border-radius:5px;
-webkit-border-radius:5px;
border-radius:5px;
padding:25px;
text-align:center;
font:20pt bold,"Vollkorn";color:#bbb
}
a { text-decoration: none }
</style>
</head>
<body>
<pre>
<b><a href="https://sheetjs.com">SheetJS NW.js Demo</a></b>
<br />
<div id="drop">Drop a spreadsheet file here to see sheet data</div>
<input type="file" name="xlfile" id="xlf" /> ... or click here to select a file
</pre>
<p><input type="submit" value="Export Data!" id="xport" onclick="export_xlsx();" disabled="true"></p>
<div id="htmlout"></div>
<br />
<script src="https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js"></script>
<script>
var fs = require('fs');
var process_wb = (function() {
var HTMLOUT = document.getElementById('htmlout');
var XPORT = document.getElementById('xport');
return function process_wb(wb) {
XPORT.disabled = false;
HTMLOUT.innerHTML = "";
wb.SheetNames.forEach(function(sheetName) {
var htmlstr = XLSX.utils.sheet_to_html(wb.Sheets[sheetName],{editable:true});
HTMLOUT.innerHTML += htmlstr;
});
};
})();
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-36810333-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
async function do_file(files) {
var file = files[0];
var data = await file.arrayBuffer();
process_wb(XLSX.read(data));
}
var drop = document.getElementById('drop');
function handleDrop(e) {
e.stopPropagation();
e.preventDefault();
do_file(e.dataTransfer.files);
}
function handleDragover(e) {
e.stopPropagation();
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
}
drop.addEventListener('dragenter', handleDragover, false);
drop.addEventListener('dragover', handleDragover, false);
drop.addEventListener('drop', handleDrop, false);
var xlf = document.getElementById('xlf');
function handleFile(e) { do_file(e.target.files); }
xlf.addEventListener('change', handleFile, false);
var export_xlsx = (function() {
var HTMLOUT = document.getElementById('htmlout');
var input = document.createElement('input');
input.style.display = 'none';
input.setAttribute('nwsaveas', 'SheetJSNWDemo.xlsx');
input.setAttribute('type', 'file');
document.body.appendChild(input);
input.addEventListener('cancel',function(){ alert("Save was canceled!"); });
input.addEventListener('change',function(e){
var filename=this.value, bookType=(filename.match(/[^\.]*$/)||["xlsx"])[0];
var wb = XLSX.utils.table_to_book(HTMLOUT.getElementsByTagName("TABLE")[0]);
var wbout = XLSX.write(wb, {type:'buffer', bookType:bookType});
fs.writeFile(filename, wbout, function(err) {
if(!err) return alert("Saved to " + filename);
alert("Error: " + (err.message || err));
});
});
return function() { input.click(); };
})();
</script>
</body>
</html>