Export HTML table to CSV using vanilla javascript

Should work on every modern browser and without jQuery or any dependency, here my implementation :

// Quick and simple export target #table_id into a csv
function download_table_as_csv(table_id, separator=",") {
    // Select rows from table_id
    var rows = document.querySelectorAll('table#' + table_id + ' tr');
    // Construct csv
    var csv = [];
    for (var i = 0; i < rows.length; i++) {
        var row = [], cols = rows[i].querySelectorAll('td, th');
        for (var j = 0; j < cols.length; j++) {
            // Clean innertext to remove multiple spaces and jumpline (break csv)
            var data = cols[j].innerText.replace(/(\r\n|\n|\r)/gm, '').replace(/(\s\s)/gm, ' ')
            // Escape double-quote with double-double-quote (see https://stackoverflow.com/questions/17808511/properly-escape-a-double-quote-in-csv)
            data = data.replace(/"/g, '""');
            // Push escaped string
            row.push('"' + data + '"');
        }
        csv.push(row.join(separator));
    }
    var csv_string = csv.join('\n');
    // Download it
    var filename="export_" + table_id + '_' + new Date().toLocaleDateString() + '.csv';
    var link = document.createElement('a');
    link.style.display = 'none';
    link.setAttribute('target', '_blank');
    link.setAttribute('href', "https://stackoverflow.com/questions/15547198/data:text/csv;charset=utf-8," + encodeURIComponent(csv_string));
    link.setAttribute('download', filename);
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

Then add your download button/link :

<a href="#" onclick="download_table_as_csv('my_id_table_to_export');">Download as CSV</a>

CSV file is timedated and compatible with default Excel format.

Update after comments: Added second parameter “separator”, it can be used to configure another character like ;, it’s useful if you have user downloading your csv in different region of the world because they can use another default separator for Excel, for more information see : https://superuser.com/a/606274/908273