const loadExcel = function () {
    let fileInput = document.getElementById('importFile');
    if (fileInput.files[0]) {
      wjcGridXlsx.FlexGridXlsxConverter.loadAsync(
        flex.current.control,
        fileInput.files[0],
        { includeColumnHeaders: true },
        (workbook) => {
          console.log(workbook);

          let rows = workbook.sheets[0].rows,
            columns = workbook.sheets[0].columns,
            data = [];
          //itreate over workbook rows and extract data from each cells
          for (let i = 0; i < rows.length; i++) {
            let obj = {};
            for (let c = 0; c < columns.length; c++) {
              obj[`${i}${c}`] = rows[i].cells[c].value;
            }
            data.push(obj);
          }

          console.log('imprted Data:', data);
        }
      );
    }
  };