Javascript

How to create a CSV export on the client-side (with javascript)

This is a really awesome script which works great for javascript applications. If you’ve saved JSON objects in the DOM, use the script below to export it into a CSV file for download. I’ve tried multiple scripts I found via Stack Overflow and such, but this one works the best:

Click here to download a CSV created client-side with javascript

The javascript CSV export function

function exportToCsv(filename, rows) {
    var processRow = function (row) {
        var finalVal = '';
        for (var j = 0; j < row.length; j++) {
            var innerValue = row[j] === null ? '' : row[j].toString();
            if (row[j] instanceof Date) {
                innerValue = row[j].toLocaleString();
            };
            var result = innerValue.replace(/"/g, '""');
            if (result.search(/("|,|\n)/g) >= 0)
                result = '"' + result + '"';
            if (j > 0)
                finalVal += ',';
            finalVal += result;
        }
        return finalVal + '\n';
    };

    var csvFile = '';
    for (var i = 0; i < rows.length; i++) {
        csvFile += processRow(rows[i]);
    }

    var blob = new Blob([csvFile], { type: 'text/csv;charset=utf-8;' });
    if (navigator.msSaveBlob) { // IE 10+
        navigator.msSaveBlob(blob, filename);
    } else {
        var link = document.createElement("a");
        if (link.download !== undefined) { // feature detection
            // Browsers that support HTML5 download attribute
            var url = URL.createObjectURL(blob);
            link.setAttribute("href", url);
            link.setAttribute("download", filename);
            link.style = "visibility:hidden";
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    }
}

An example on how I use this function:

//example JSON object (potentially saved in the DOM)
var data_in_dom = [{ 
   'id' : 1,
   'name' : 'Anthony',
   'address' : '1570 Woodward',
   'city' : 'Detroit',
   'region' : 'MI',
   'postal_code' : '48226',
   'country' : 'US',
}];

//create CSV header labels
var exportData = [[ 'ID', 'Name', 'Address', 'City', 'Region', 'Postal Code', 'Country']];

//prepare a JSON element for CSV export
jQuery.each(data_in_dom, function(i, currentRow) {
	exportData.push([ currentRow.id, currentRow.name, currentRow.address, currentRow.city, currentRow.region, currentRow.postal_code, currentRow.country ]);
});

//create a date/time string to be used in the file name
var now = new Date();
var currentDateTimeString = now.getMonth()+1 + '-' + now.getDate() + '-' + now.getFullYear() + '-' + now.getHours() + now.getMinutes() + now.getSeconds();

//generate file
exportToCsv('CustomReport-' + currentDateTimeString + '.csv', exportData);
Shares