Export to csv from javascript.

simplejsexportcsv.js

function downloadFile(fileName, urlData) {
    console.log('downloadFile', fileName);
    var aLink = document.createElement('a');
    var evt = document.createEvent("HTMLEvents");
    evt.initEvent("click");
    aLink.download = fileName;
    aLink.href = urlData;
    aLink.dispatchEvent(evt);
}

if (selections.length > 0) {
    var A = [['Codigo', 'Descripcion']];

    for (var j = 1; j < selections.length + 1; ++j) {
        A.push(['1234', 'DESC' ]);
    }

    var csvRows = [];

    for (var i = 0, l = A.length; i < l; ++i) {
        csvRows.push(A[i].join(';'));
    }

    //var csvString = csvRows.join("%0A");
    //var csvString = "SEP=, \n" + csvRows.join("\r\n");
    var csvString = csvRows.join("\r\n");
    var a = document.createElement('a');
    a.href = 'data:attachment/csv,' + encodeURIComponent(csvString);
    a.target = '_blank';
    a.download = 'filename.csv';


    a.click();
} else {
    alert('No se eligio nada.');
}