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downloadFile(data: any, filename:string) {
    const replacer = (key, value) => value === null ? '' : value;
    const header = Object.keys(data[0]);
    let csv = data.map(row => header.map(fieldName => JSON.stringify(row[fieldName],replacer)).join(','));
    csv.unshift(header.join(','));
    let csvArray = csv.join('\r\n');
    var blob = new Blob([csvArray], {type: 'text/csv' })
    saveAs(blob, filename + ".csv");
}