datagrid某列中的textbox触发事件

html:
<asp:datagrid id="dg_RecItem" runat="server" CssClass="DataGrid" Width="98%" AutoGenerateColumns="False">
                                    <SelectedItemStyle CssClass="dgdSelectedItem"></SelectedItemStyle>
                                    <EditItemStyle CssClass="dgdEditItem"></EditItemStyle>
                                    <ItemStyle CssClass="dgdItem"></ItemStyle>
                                    <HeaderStyle Wrap="False" CssClass="dgdHead"></HeaderStyle>
                                    <Columns>                                        
                                        <asp:TemplateColumn HeaderText="Qty Recv">
                                            <HeaderStyle Width="100px"></HeaderStyle>
                                            <ItemTemplate>
                                                <asp:TextBox id="txt_QtyRecv" runat="server" Width="90%" AutoPostBack="True" OnTextChanged="txt_QtyRecv_TextChange"></asp:TextBox>
                                                <asp:Label id="lbl_QtyRecv" runat="server"></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateColumn>                                        
                                    </Columns>
                                </asp:datagrid>
                                
cs:
                                public void txt_QtyRecv_TextChange( object sender , System.EventArgs e )
        ...{            
            TextBox tb = (TextBox)sender;                
            DataGridItem item = (DataGridItem)tb.Parent.Parent;
            itemIndex = item.ItemIndex;
            ...
            }

 ajax方法：

<script>    
  function AI_Compute_Prom(ctlID)
  {
        var ctlEmp= getDataGrid_TemplateControlID(ctlID.toString(),'AI_txt','AI_txt_EmpID');
        var ctlGrade = getDataGrid_TemplateControlID(ctlID.toString(),'AI_txt','AI_txt_Grade');
                     
        var empID = document.getElementById(ctlEmp).value.Trim();
        var periodID = document.getElementById("AI_txt_PeriodID").value.Trim();
             
       var inputParams = empID +';'+ periodID+';'+Grade;
      
       outputParams = HMS.AI.Page.StaffAI.Compute_AI_PROM(inputParams).value;
             
       AI_Write(ctlID,outputParams);
  }
  
  function getDataGrid_TemplateControlID(ctlID,partID,newPartID)
  {
      var nIndex = ctlID.indexOf(partID.toString());
      var  prefixID  = ctlID.substring(0, nIndex);
      return prefixID+newPartID.toString();
  }    
  
  function AI_Write(ctlID,outputParams)
  {
      var ctlMerit = getDataGrid_TemplateControlID(ctlID.toString(),'AI_txt','AI_txt_Merit');
      var ctlSVC = getDataGrid_TemplateControlID(ctlID.toString(),'AI_txt','AI_txt_SVC');
           
      var txtMerit = document.getElementById(ctlMerit);
      var txtSVC = document.getElementById(ctlSVC);
           
      var outputArray = outputParams.split(';');
      if (outputArray.length >= 4)
      {
          txtMerit.value = outputArray[0];
          txtSVC.value = outputArray[1];
      }
  }
</script>

<EditItemTemplate>
 <asp:TextBox id="AI_txt_PreSal" runat="server" CssClass="textbox" Width="100%" onchange="AI_Compute_Prom(this.id.toString())"></asp:TextBox>
</EditItemTemplate>

.cs:

 引用AjaxPro.dll。
 
 private void Page_Load(object sender, System.EventArgs e)
  {
   AjaxPro.Utility.RegisterTypeForAjax(typeof(FileName));
  }

[AjaxPro.AjaxMethod]
  public string Compute_AI_PROM(string inputParams)
  {
   string outputParams = "";
   AppraisalMasterCTL appraisalMaster  = new  AppraisalMasterCTL();
   AIRecordENT record = new AIRecordENT();
   string[] inputArray = inputParams.Split(';');
   record.EmployeeID = inputArray[0];
   record.PeriodID = Convert.ToInt32(inputArray[1]);
   appraisalMaster.computeProm(record);
   outputParams =record.AIMerit +";"+record.SVC_Increment;
   return outputParams;
  }