Angular 7 only visible rows of paginated data tabl

Question

I need to export an angular material data table into excel file, using xlsx library.

The issue is that, if I am using pagination within the data table, and on export, only the visible rows are exported:

exportTable()
  {
    //let data = Object.values(this.dataSource);
    const ws: xlsx.WorkSheet=xlsx.utils.table_to_sheet(this.table.nativeElement);
    const wb: xlsx.WorkBook = xlsx.utils.book_new();
    xlsx.utils.book_append_sheet(wb, ws, 'All Data Export');

    /* save to file */
    xlsx.writeFile(wb, 'ExportAllData.xlsx');
  }

I tried to export it using json_to_sheet():

  exportTable()
  {
    let data = this.allData;
    const ws: xlsx.WorkSheet=xlsx.utils.json_to_sheet(data);
    const wb: xlsx.WorkBook = xlsx.utils.book_new();
    xlsx.utils.book_append_sheet(wb, ws, 'All Data Export');

    /* save to file */
    xlsx.writeFile(wb, 'ExportAllData.xlsx');
  }

But the header is now indexes instead of field titles.

Here is a stackblitz describing the issue.

Should I use the second method by adding a header row to the array using .push() and then download it ? Or is it better to use ng-table-export library ?

Answer 1

Try using options parameter of json_to_sheet function;

let options:JSON2SheetOpts  = {header: ['Name', 'Surname', 'Age']};
const ws: XLSX.WorkSheet=XLSX.utils.json_to_sheet(data, options);
const wb: XLSX.WorkBook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, 'All Data Export');
XLSX.writeFile(wb, excelFileName + '.xlsx');