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Anchor tag download attribute not working :Bug in Chrome 35.0.1916.114

Posted by: admin November 30, 2017 Leave a comment

Questions:

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 = '"\r\n"',

            // 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.

Answers:

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!

Questions:
Answers:

This is a bug in Chrome 35 reported in issue #377860.

Update: This bug was merged into issue #373182. You can click the star to tell the devs you think this issue should get fixed and also get notified of changes.

Typically the chromium team releases an update every 2 weeks so you can expect a fix soon since this is marked as Pri-1 which I assume means highest priority.

Questions:
Answers:

For me worked:

var content = "some content";
var link = document.createElement('a');
var blob = new Blob(["\ufeff", content]);
var url = URL.createObjectURL(blob);
link.href = url;
link.setAttribute('download', 'file.csv');
link.click();

Questions:
Answers:

Here is a bit that worked for me (in Chrome and Firefox). I’m building a xls file out of a table.

  function downloadInnerHtml(filename,elId,mimeType){
    var elHtml='<table border="1">'+document.getElementById(elId).innerHTML+'</table>';
    var link=document.createElement('a');
    mimeType=mimeType || 'application/xls';

    var blob=new Blob([elHtml],{type:mimeType});
    var url=URL.createObjectURL(blob);
    link.href=url;

    link.setAttribute('download', filename);
    link.innerHTML = "Export to CSV";
    document.body.appendChild(link);
    link.click();
  }

  $(document).on("click","#exportButton",function(){
    var date=new Date();
    var mm=date.getMonth()+1;
    var dd=date.getDate();
    var yy=date.getFullYear();
    var timeStamp=yy+""+((mm<10)?"0"+mm:mm)+""+((dd<10)?"0"+dd:dd);
    var fileName=timeStamp+'_Employees.xls';
    downloadInnerHtml(fileName,'mainEmployeeTable','application/xls');
  });

Hope that helps someone else…

–Charles

Questions:
Answers:

When I tried this code, I was not able to get results in IE plus this code only iterates over td, it will skip any th present in your table. I have modified the code to resolve both the issues I was facing:

$(document).ready(function () {
    function exportTableToCSV($table, filename) {

            var $rows = $table.find('tr'),
            tmpColDelim = String.fromCharCode(11),
            tmpHeadDelim = String.fromCharCode(11),
            tmpRowDelim = String.fromCharCode(0),
            colDelim = '","',
            headDelim = '","',
            rowDelim = '"\r\n"',

            csv = '"' + $rows.map(function (i, row) {
                var $row = $(row),
                $cols = $row.find('td');
                $heads = $row.find('th');

                var c = $heads.map(function (k, head) {
                    var $head = $(head),
                    text = $head.text();
                    return text.replace(/"/g, '""');
                }).get().join(tmpHeadDelim);

                var d = $cols.map(function (j, col) {
                    var $col = $(col),
                    text = $col.text();
                    return text.replace(/"/g, '""');
                }).get().join(tmpColDelim);

            return (c+d);

        }).get().join(tmpRowDelim)
            .split(tmpRowDelim).join(rowDelim)
            .split(tmpHeadDelim).join(headDelim)
            .split(tmpColDelim).join(colDelim) + '"';


        var ua = window.navigator.userAgent;
        var msie = ua.indexOf("MSIE ");

        // if Internet Explorer (10+)
        if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) {
            var blob = new Blob([decodeURIComponent(csv)], {
                    type: 'text/csv;charset=utf8'
            });
            window.navigator.msSaveBlob(blob, filename);
        }
        else {
            var link = document.createElement('a');
            var blob = new Blob([csv],{type:'text/csv;charset=utf8'});
            var url = URL.createObjectURL(blob);
            link.href = url;
            link.setAttribute('download', filename);
            document.body.appendChild(link);
            link.click();
        }
    }

    $("#fnExcelReport").on('click', function (event) {
        var args = [$('#tableContent'), 'Report.csv'];
        exportTableToCSV.apply(this, args);
    });
});

CodePen

Questions:
Answers:

append anchor tag using string add tag information in string and then append, it works for me for google chrome