使用键盘上和下键浏览角度物料表单元格

如何解决使用键盘上和下键浏览角度物料表单元格

how to navigate table cells in mat-table using arrow(up & down) keys in keyboard.  I have tried using java script but I Could not find correct solution.Any help is appreciated.

1. 文档上的主机侦听器：按下事件时调用函数 @零件（{ 选择器：“ table-basic-example”， styleUrls：['table-basic-example.css']， templateUrl：“ table-basic-example.html”， 主持人：{ '（document：keydown）'：'checkKeystroke（$ event）' } }）

2. Calling function on key press event:

  this.start =document.getElementById('start');
   if (e.keyCode == '40') {
    // down arrow
    let idx = this.start.cellIndex;
 //  get the next row cell 
    let nextrow = this.start.parentElement.nextElementSibling;
    if (nextrow != null) {
      let sibling = nextrow.cells[idx];
      this.navigatetoCell(sibling);

    }
  } 
}

below is the link what I tried so far https://stackblitz.com/edit/angular-mwdvbw?file=src%2Fapp%2Ftable-basic-example.ts