從Client如何取ColumnName

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hello iceman
      用戶點擊effectivedate欄位時要彈出一個日期控件,因在后臺用DateCalendarCellType屬性跟FarPoint.Web.Spread.Extender有沖突,現在前臺用javascript實現,需要判斷是effectivedate欄位才彈起日期控件.用如下代碼可以取到colHeaderTable  對象,但不知道怎么判斷是那個columnname

function cellChanged() {

         debugger;
         var row = event.row;
         var col = event.col;
         //var spread1 = document.getElementById("fpsWebRfqDtl");

         //var rowHeaderTable = this.document.getElementById("fpsWebRfqDtl_rh");
         var colHeaderTable = this.document.getElementById("fpsWebRfqDtl_colHeader");

         scell  =colHeaderTable.cells[1,col ].value       //  計算是否是effectivedate欄位
         if (scell == "effectivedate") {
               strDate = formatDate(OpenDlg("../Jscript/Calendar1.htm" + window.location.search, 206, 207, Text), 0);
         }
      }