Django xlsxWriter view and Jquery download xlsx client side

djangoViewFile.py

def export_xlsx(request):
        response = HttpResponse(content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
        response['Content-Disposition'] = 'attachment; filename="{}"'.format(self._fname)

        # Excel configuration
        # TODO add more formatting
        workbook = xlsxwriter.Workbook(response, {'in_memory': True})
        worksheet = workbook.add_worksheet(self._sheet_name)
        bold = workbook.add_format({'bold': True})
        row = 1
        col = 0

        # Header
        xlsx_columns = set([1,2,3,4])

        # Header Write
        for i, label in enumerate(list(xlsx_columns)):
            worksheet.write(0, i, label, bold)

        workbook.close()
        return response

downloadxlsxWriterData.js

function downloadFile(filename, text, format) {
        // Simple Download Function
        // https://ourcodeworld.com/articles/read/189/how-to-create-a-file-and-generate-a-download-with-javascript-in-the-browser-without-a-server
        // TODO Make a better download function
        'use strict';
        var element = document.createElement('a'),
            ext = format || '';

        if (ext === 'json') {
            element.setAttribute('href', 'data:application/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(text)));
        } else {
          // ext === 'csv' || ext === 'xlsx'
            element.setAttribute('href', URL.createObjectURL(text));
        }
        element.setAttribute('download', filename);
        element.style.display = 'none';
        document.body.appendChild(element);
        element.click();
        document.body.removeChild(element);
    }


$(function () {
//ajax to export_xlsx in python django view
$.ajax({
            type: 'POST',
            url: 'export_xlsx',
            xhrFields: {responseType: 'blob'},
            data: {input: 1},
            success: function (response) {
                if (response.status === 'failed') {
                    //error
                } else if (response) {
                    downloadFile(fileName, response, format);
                }
            },
            error: function (response) {
                //error
            }
      });
      
}