HTML Table to CSV in JavaScript

table+csv.js

function exportTableToCSV($table, filename, delimiter) {
    var $headers = $table.find('tr:has(th)'),
        $rows = $table.find('tr:has(td)')
        // Temporary delimiter characters unlikely to be typed by keyboard
        // This is to avoid accidentally splitting the actual contents
        ,
        tmpColDelim = String.fromCharCode(11) // vertical tab character
        ,
        tmpRowDelim = String.fromCharCode(0) // null character
        // actual delimiter characters for CSV format
        ,
        colDelim = '"' + delimiter + '"',
        rowDelim = '"\r\n"';
    // Grab text from table into CSV formatted string
    var csv = '"';
    csv += formatRows($headers.map(grabRow));
    csv += rowDelim;
    csv += formatRows($rows.map(grabRow)) + '"';
    // Data URI
    //var csvData = 'data:application/csv;charset=utf-8,' + encodeURIComponent(csv);
    var csvData = encodeURIComponent(csv);
    download(csv, filename);
    //------------------------------------------------------------
    // Helper Functions
    //------------------------------------------------------------
    function download(csv, filename) {
        var pp = document.createElement('a');
        pp.setAttribute('href', 'data:application/csv;charset=utf-8,' + encodeURIComponent(csv));
        pp.setAttribute('download', filename);
        pp.click();
    }
    // Format the output so it has the appropriate delimiters
    function formatRows(rows) {
        return rows.get().join(tmpRowDelim)
            .split(tmpRowDelim).join(rowDelim)
            .split(tmpColDelim).join(colDelim);
    }
    // Grab and format a row from the table
    function grabRow(i, row) {

        var $row = $(row);
        //for some reason $cols = $row.find('td') || $row.find('th') won't work...
        var $cols = $row.find('td');
        if (!$cols.length) $cols = $row.find('th');
        return $cols.map(grabCol)
            .get().join(tmpColDelim);
    }
    // Grab and format a column from the table
    function grabCol(j, col) {
        var $col = $(col),
            $text = $col.text();
        return $text.replace('"', '""'); // escape double quotes
    }
}

Example
This example will export every table of class wikitable to csv file with a column separator ;.

$('.wikitable').each(function(index,item) {
 exportTableToCSV( $(item), 'csv_'+index+'.csv', ";" );
});

Reference test page here.