Extending the 'google.visualization.DataTable' prototype with toCSV

extend.js

// Extend DataTable functionality to include toCSV
google.visualization.DataTable.prototype.toCSV = function () {
    var dt_cols = this.getNumberOfColumns();
    var dt_rows = this.getNumberOfRows();
    
    var csv_cols = [];
    var csv_out;
    
    // Iterate columns
    for (var i=0; i<dt_cols; i++) {
        // Replace any commas in column labels
        csv_cols.push(this.getColumnLabel(i).replace(/,/g,""));
    }
    
    // Create column row of CSV
    csv_out = csv_cols.join(",")+"\r\n";
    
    // Iterate rows
    for (i=0; i<dt_rows; i++) {
        var raw_col = [];
        for (var j=0; j<dt_cols; j++) {
            // Replace any commas in row values
            raw_col.push(this.getFormattedValue(i, j, 'label').replace(/,/g,""));
        }
        // Add row to CSV text
        csv_out += raw_col.join(",")+"\r\n";
    }

    return csv_out;
}