DataGrid自动编号

DataGrid自动编号。

/**
* 生成序号
*/
private function formatIndexNumber(item:Object, colum:Object):String
{
  return indexNumLabelFun(item, colum.mx_internal::owner);
}

public static function indexNumLabelFun(value:Object, dataGrid:Object):String
{
  var arr: Array = dataGrid.dataProvider.source;
  var indexNum: int = (arr.indexOf(value) + 1);           
  return indexNum.toString();
}

<mx:DataGridColumn headerText="序号" width="50" labelFunction="formatIndexNumber"  />