kendo-grid excel导出动态列

Question

我有一个使用动态列制作的kendo网格。后端需要两个日期，并在两个日期之间输出数据网格。每个星期都有一列，看起来是这样的：

由于用户可以手动选择日期范围，因此列数是动态的。我已经通过在component.ts文件中执行以下操作来解决该问题：

t1 <- data.frame(FirstName= c('a','b','c','d'), stringsAsFactors = FALSE)
t2 <- data.frame(Name= c('a','b','c'), stringsAsFactors = FALSE)

library(dplyr)
t1 %>%
  left_join(mutate(t2, Name2 = Name), c('FirstName'  = 'Name2'))
#  FirstName Name
#1         a    a
#2         b    b
#3         c    c
#4         d <NA>

和我的component1.html看起来像这样：

import { Component, OnInit, Injectable } from '@angular/core';
import { DataService } from '../data.service';
import { Plants } from '../Plants';
import { DatePipe } from '@angular/common';

@Component({
  selector: 'app-component1',
  templateUrl: './component1.component.html',
  styleUrls: ['./component1.component.css']
})
@Injectable()
export class Component1Component implements OnInit {

  constructor(private dataService: DataService) { }

  public tableData: [];
  public columns: Array<string>;
  public currentDate = new Date(Date.now());
  public startDate: Date;
  public endDate: Date;
  public datePipe = new DatePipe('en-US');

  ngOnInit() {
    this.endDate = this.currentDate;
    if (this.currentDate.getMonth() < 9) {
      this.startDate = new Date();
      this.startDate.setFullYear(this.currentDate.getFullYear() - 1);
      this.startDate.setMonth(9);
      this.startDate.setDate(1);
    } else {
      this.startDate = new Date();
      this.startDate.setFullYear(this.currentDate.getFullYear());
      this.startDate.setMonth(9);
      this.startDate.setDate(1);
    }
    this.getTableData();

  }

  getTableData() {
    const sdate = this.datePipe.transform(this.startDate, 'yyyy-MM-dd');
    const edate = this.datePipe.transform(this.endDate, 'yyyy-MM-dd');
    this.dataService.getData(Plants.Name, sdate, edate).subscribe(results => {
      this.tableData = results['Table'];
      this.columns = Object.keys(results['Table'][0]);
      for (let i = this.columns.length - 1; i >= 0; i--) {
        if (this.columns[i] === 'PlantName' ||
            this.columns[i] === 'Department' ||
            this.columns[i] === 'GLAccount' ||
            this.columns[i] === 'AccountDescription') {
          this.columns.splice(i, 1);
        }
      }
      console.log(this.columns);
    });
  }

  }

}

我尝试使用kendo-grid-excel和kendo-excelexport导出。它们都在我的excel文件中呈现静态列，但是均未呈现动态列数据。如何导出数据？