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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>CSV-Merge</title>
</head>
<body>
<div id="inputs" class="clearfix">
<input type="file" id="files" name="files[]" multiple />
<a></a>
</div>
<hr />
<output id="list">
</output>
<hr />
<table id="contents" style="width:100%; height:400px;" border>
</table>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-csv/0.8.9/jquery.csv.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.5.0/d3.min.js"></script>
<script>
$(document).ready(function () {
if (isAPIAvailable()) {
$('#files').bind('change', handleFileSelect);
}
});
function isAPIAvailable() {
// Check for the various File API support.
if (window.File && window.FileReader && window.FileList && window.Blob) {
// Great success! All the File APIs are supported.
return true;
} else {
// source: File API availability - http://caniuse.com/#feat=fileapi
// source: <output> availability - http://html5doctor.com/the-output-element/
document.writeln('The HTML5 APIs used in this form are only available in the following browsers:<br />');
// 6.0 File API & 13.0 <output>
document.writeln(' - Google Chrome: 13.0 or later<br />');
// 3.6 File API & 6.0 <output>
document.writeln(' - Mozilla Firefox: 6.0 or later<br />');
// 10.0 File API & 10.0 <output>
document.writeln(' - Internet Explorer: Not supported (partial support expected in 10.0)<br />');
// ? File API & 5.1 <output>
document.writeln(' - Safari: Not supported<br />');
// ? File API & 9.2 <output>
document.writeln(' - Opera: Not supported');
return false;
}
}
var output;
function handleFileSelect(evt) {
output = '';
processData(evt.target.files); // FileList object
}
function processData(files) {
var counter = 0;
var data = [];
Array.from(files).forEach(file => {
output += '<span style="font-weight:bold;">' + escape(file.name) + '</span><br />\n';
output += ' - FileType: ' + (file.type || 'n/a') + '<br />\n';
output += ' - FileSize: ' + file.size + ' bytes<br />\n';
output += ' - LastModified: ' + (file.lastModifiedDate ? file.lastModifiedDate.toLocaleDateString() : 'n/a') + '<br />\n';
var reader = new FileReader();
reader.readAsText(file);
reader.onload = function (event) {
data = data.concat(d3.csvParse(event.target.result));
if (++counter === files.length) printTable(data);
};
reader.onerror = function () { alert('Unable to read ' + file.fileName); };
})
}
function printTable(objects) {
var csv = $.csv.fromObjects(objects);
var csvArr = CSVToArray(csv);
var html = '';
csvArr.forEach(row => {
html += '<tr>\r\n';
row.forEach(datum => {
html += '<td>' + datum + '</td>\r\n';
})
html += '</tr>\r\n';
})
$('#list').html(output);
$('#contents').html(html);
$('a').text('Click Here to download').attr({
href: window.URL.createObjectURL(new Blob([csv], { type: "data:text/csv" })),
download: Date.now() + ".csv"
})
}
// ref: http://stackoverflow.com/a/1293163/2343
// This will parse a delimited string into an array of
// arrays. The default delimiter is the comma, but this
// can be overriden in the second argument.
function CSVToArray(strData, strDelimiter) {
// Check to see if the delimiter is defined. If not,
// then default to comma.
strDelimiter = (strDelimiter || ",");
// Create a regular expression to parse the CSV values.
var objPattern = new RegExp(
(
// Delimiters.
"(\\" + strDelimiter + "|\\r?\\n|\\r|^)" +
// Quoted fields.
"(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|" +
// Standard fields.
"([^\"\\" + strDelimiter + "\\r\\n]*))"
),
"gi"
);
// Create an array to hold our data. Give the array
// a default empty first row.
var arrData = [[]];
// Create an array to hold our individual pattern
// matching groups.
var arrMatches = null;
// Keep looping over the regular expression matches
// until we can no longer find a match.
while (arrMatches = objPattern.exec(strData)) {
// Get the delimiter that was found.
var strMatchedDelimiter = arrMatches[1];
// Check to see if the given delimiter has a length
// (is not the start of string) and if it matches
// field delimiter. If id does not, then we know
// that this delimiter is a row delimiter.
if (
strMatchedDelimiter.length &&
strMatchedDelimiter !== strDelimiter
) {
// Since we have reached a new row of data,
// add an empty row to our data array.
arrData.push([]);
}
var strMatchedValue;
// Now that we have our delimiter out of the way,
// let's check to see which kind of value we
// captured (quoted or unquoted).
if (arrMatches[2]) {
// We found a quoted value. When we capture
// this value, unescape any double quotes.
strMatchedValue = arrMatches[2].replace(
new RegExp("\"\"", "g"),
"\""
);
} else {
// We found a non-quoted value.
strMatchedValue = arrMatches[3];
}
// Now that we have our value string, let's add
// it to the data array.
arrData[arrData.length - 1].push(strMatchedValue);
}
// Return the parsed data.
return (arrData);
}
</script>
</body>
</html>