JS给datagrid的单元格赋值
现在我想用js给datagrid的单元格赋值，
比如datagrid里面有10行数据，我想修改第10行的第一列，是纯数字的code,但是现在要求code的位数一直是4位，比如我输入12，显示的必须是0012，从12到0012我想用js来完成，但不知道怎么做，求高人指点！
<script type="text/javascript">
function SubjectGrid_AfterCellUpdateHandler(gridName, id)
{
  var row = igtbl_getActiveRow("<%=SubjectGrid.ClientID %>");
  var cell=row.getCellFromKey( "SubjectCode"); 
  var flag=cell.getValue(); 
  if(flag!=""&&flag!=null)
  {
  for (var i = 0; i < flag.length; i++)
  {
  var code = flag.substring(i,i+1);
  if(! (code == "1" || code == "2" || code == "3" || code == "4" || code == "5" || code == "6" || code == "7" || code == "8" || code == "9" || code == "0"))
  {
  var cell=row.getCellFromKey( "SubjectCode"); 
  cell.innerText= "";
  var myForm = document.getElementById("aspnetForm");
  myForm.submit();
  return;
  }
  }
  var temp = flag.length;
  if(temp!=4)
  {
  for (var i = 0; i < 4 - temp; i++)
  {
  flag = "0" + flag;
  }
  var cell=row.getCellFromKey( "SubjectCode"); 
  cell.innerText= flag;
  var myForm = document.getElementById("aspnetForm");
  myForm.submit();
  }
  }
}
  </script>
这是我写得，在提交前能够获得正确的值（0012）但是无法赋给单元格！

------解决方案--------------------
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