asp:Repeater 里asp:DropDownList js 传当前行

Question

<asp:Repeater ID="RepeaterNoFixed" runat="server" OnItemDataBound="gvFreeNoFixedDate_ItemDataBound">
    <HeaderTemplate>
<table style="line-height:30px; ">
  <tr>
    <th> 选择日期</th>
    </tr>
    </HeaderTemplate>
    <ItemTemplate>
  <tr>
      <td ><asp:DropDownList ID="ddldatelst" runat="server" 
             onchange="changeindex('<#Container.ItemIndex+1 %>')" ></asp:DropDownList></td>
       </tr>
 </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
  </asp:Repeater>
问题:
changeindex 得不到传过来的当前行