javascript - Anchor tag download attribute not working :Bug in Chrome 35.0.1916.114

Question

I am trying to refer to this code where a we are downloading a CSV file on click of a link.

$(document).ready(function () {

    function exportTableToCSV($table, filename) {

        var $rows = $table.find('tr:has(td)'),

            // Temporary delimiter characters unlikely to be typed by keyboard
            // This is to avoid accidentally splitting the actual contents
            tmpColDelim = String.fromCharCode(11), // vertical tab character
            tmpRowDelim = String.fromCharCode(0), // null character

            // actual delimiter characters for CSV format
            colDelim = '","',
            rowDelim = '"
"',

            // Grab text from table into CSV formatted string
            csv = '"' + $rows.map(function (i, row) {
                var $row = $(row),
                    $cols = $row.find('td');

                return $cols.map(function (j, col) {
                    var $col = $(col),
                        text = $col.text();

                    return text.replace('"', '""'); // escape double quotes

                }).get().join(tmpColDelim);

            }).get().join(tmpRowDelim)
                .split(tmpRowDelim).join(rowDelim)
                .split(tmpColDelim).join(colDelim) + '"',

            // Data URI
            csvData = 'data:application/csv;charset=utf-8,' + encodeURIComponent(csv);

        $(this)
            .attr({
            'download': filename,
                'href': csvData,
                'target': '_blank'
        });
    }

    // This must be a hyperlink
    $(".export").on('click', function (event) {
        // CSV
        exportTableToCSV.apply(this, [$('#dvData>table'), 'export.csv']);

        // IF CSV, don't do event.preventDefault() or return false
        // We actually need this to be a typical hyperlink
    });
});

But somehow, the downloaded file is named as download without extension in Chrome v35.0.1916.114 , one workaround was to change data:application/csv to data:text/csv, but that only helped in getting the extension correct in the downloaded file i.e. it now downloads as download.csv.

The issue with the download attribute still remains. I wanted to name my file as export.csv, but it still gives me download.csv.

Answer 1

So you should change this:

// Data URI
csvData = 'data:application/csv;charset=utf-8,' + encodeURIComponent(csv);

$(this)
    .attr({
    'download': filename,
        'href': csvData,
        'target': '_blank'
});

To This

// Data URI
//csvData = 'data:text/csv;charset=utf-8,' + encodeURIComponent(csv), //old way
blob = new Blob([csv], { type: 'text/csv' }); //new way
var csvUrl = URL.createObjectURL(blob);

$(this)
.attr({
    'download': filename,
    'href': csvUrl
});

And it should work!