AJAX问题：为什么弹出的Panel中的textBox，DROPDOWNLIST不显示指定内容(为空)？

Question

部分代码：
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
 <ContentTemplate>
                         <asp:Repeater ID="RepeaterNote" runat="server" OnItemCommand="RepeaterNote_ItemCommand">
                                      <HeaderTemplate>
                                         <table cellspacing="0" cellpadding="0" width="100%">
                                           <tr>
                                              <td width="75%" align="left"> &nbsp; </td>
                                              <td width="25%" align="left"><font size="Large">最后修改时间</font></td>
                                           </tr>
                                      </HeaderTemplate>
                                     
                                      <ItemTemplate>
                                            <tr>
                                               <td>      
                                                   <asp:Label ID="lblNoteId" runat="server" Text='<%# Eval("id") %>' Visible=false></asp:Label>
                                                   <asp:CheckBox ID="chkID" runat="server" />    &nbsp;          
                        <asp:LinkButton ID="btnNote" CommandName="shownote" CommandArgument=<%# Eval("id") %> Font-Size="Large" Width="90%" runat="server"><%# DataBinder.Eval(Container.DataItem, "Title")%></asp:LinkButton>
                                               </td>
                                               <td>
                                                  <asp:Label ID="lblLastEditDate" Text='<%# Eval("LastEditDate")%>' runat=server Font-Size="Large"></asp:Label>
                                               </td>
                                            </tr>
                                      </ItemTemplate>
                                     
                                      <FooterTemplate>
                                         </table>
                                      </FooterTemplate>
                        </asp:Repeater>     
                        <webdiyer:AspNetPager ID="AspNetPagerNote" runat="server" OnPageChanged="AspNetPagerNote_PageChanged"
                            Width="90%" SubmitButtonText="到" ShowCustomInfoSection="Left" ShowBoxThreshold="3"
                            PageSize="16" AlwaysShow="True" HorizontalAlign="Right" Font-Size="X-Large"/> 
 </ContentTemplate>
 <Triggers>
   <asp:AsyncPostBackTrigger ControlID="btnExit2" EventName="Click" />
 </Triggers>
</asp:UpdatePanel>
... ...
<asp:Panel ID="pan" runat="server" style="display:none;">
 <table width="700" border="0" align="center">
  <tr>
    <td id="Drag">
       <table width="665" border="0" cellspacing="0" cellpadding="0">
          <tr>
            <td align=right>
              <font color=white size="Large">文件夹：</font>
            </td>
            <td align=left>
                <asp:DropDownList ID="ddlFolder" Font-Size="Large" runat="server">
                </asp:DropDownList>
            </td>
          </tr>
          <tr>
            <td align=right>
              <h2><font color=white>便笺：</font></h2>
            </td>
            <td align=left>
                <asp:TextBox ID="txtNote" TextMode=MultiLine Font-Size="Large" Width=500 Height=400 runat="server"></asp:TextBox>
            </td>
          </tr>
       </table>
    </td>
  </tr>
  <tr>
     <td bgcolor=aqua align=Center>
        <asp:Label ID="lblNoteId1" text="" Visible=false runat=server />
        <asp:Button ID="btnSave" runat="server" Text="保 存" Font-Size="Large" OnClick="btnSave_Click" />
        <asp:Button ID="btnDelNote2" runat="server" Text="删 除" Font-Size="Large" OnClick="btnDelNote2_Click" />
        <asp:Button ID="btnExit" runat="server" Text="取 消" Font-Size="Large" />
     </td>
  </tr>
</table>
</asp:Panel>
<ajaxtoolkit:ModalPopupExtender ID="Modal" runat="server" TargetControlID="tmpButton"
    PopupControlID="pan" DropShadow="true" PopupDragHandleControlID="Drag"
    CancelControlID="btnExit" />
<asp:Button ID="tmpButton" runat="server" Style="display: none" />后台部分代码：
    protected void RepeaterNote_ItemCommand(object sender, RepeaterCommandEventArgs e)
    {
      OleDbConnection conn1 = new OleDbConnection(Conn.GetConnString("DbPath"));
      System.Data.OleDb.OleDbDataAdapter adpt1 = new System.Data.OleDb.OleDbDataAdapter();
      DataTable q = new DataTable();      if (e.CommandName == "shownote")
      {
        lblNoteId1.Text = (String)e.CommandArgument;
        CreateDDl();        adpt1 = new System.Data.OleDb.OleDbDataAdapter("select FolderId,Cont from notes where id=" + (String)e.CommandArgument, conn1);
        adpt1.Fill(q);
        if (q != null)
        {
          ddlFolder.SelectedValue = ((Int32)q.Rows[0]["FolderId"]).ToString();
          lblFolderId.Text = ((Int32)q.Rows[0]["FolderId"]).ToString();
          txtNote.Text = (string)q.Rows[0]["Cont"];
        }
        else
        {
          ddlFolder.SelectedIndex = 0;
        }
        btnDelNote2.Visible = true;
        Modal.Show();
      }
      conn1.Close();
    }    protected void CreateDDl()
    {
      OleDbConnection conn1 = new OleDbConnection(Conn.GetConnString("DbPath"));
      System.Data.OleDb.OleDbDataAdapter adpt1 = new System.Data.OleDb.OleDbDataAdapter("select id,FolderName from NoteFolders where [user]='" + app.user() + "' order by FolderName",conn1);
      DataTable q = new DataTable();
      adpt1.Fill(q);      ddlFolder.Items.Clear();
      if (q!=null && q.Rows.Count> 0)
      {
        foreach (DataRow r in q.Rows)
        {
          ddlFolder.Items.Add(new ListItem((string)r["FolderName"], ((Int32)r["id"]).ToString()));
        }
      }
      conn1.Close();
      ddlFolder.Items.Add(new ListItem("未存档的", "0"));
      ddlFolder.Items.Add(new ListItem("[添加文件夹]", "99999"));
    }

Answer 1

把ModalPopupExtender中的CancelControlID="btnExit" 这句去掉
ModalPopupExtender默认执行的是JS脚本，要想执行后台的CS代码
必须把所有与JS有关的事件代码去掉
ModalPopupExtender属性中只要设定TargetControlID，PopupControlID就足够了
可以根据需要添加BackgroundCssClass，DropShadow等美观属性
但CancelControlID这类事件属性不要加

Answer 2

谢谢zhlei616，
但是把ModalPopupExtender中的CancelControlID="btnExit" 这句去掉 还是不行啊！

Answer 3

把ModalPopupExtender中的CancelControlID="btnExit" 这句去掉 好象可以诶，
但是还得仔细调试一下！

Answer 4

新的代码：（后台代码不变）
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
 <ContentTemplate>
                                          <asp:Repeater ID="RepeaterFolder" runat="server" OnItemCommand="RepeaterFolder_ItemCommand">
                                            <HeaderTemplate>
                                              <table cellspacing="0" cellpadding="0" width="100%">
                                            </HeaderTemplate>
                                         
                                            <ItemTemplate>
                                                <tr>
                                                   <td>                 
                                <asp:LinkButton ID="btnFolderSelect" CommandName="folderselect" CommandArgument=<%# Eval("id") %> Font-Size="Large" Width="95%" runat="server"><%# app.GetLenString(Convert.ToString(DataBinder.Eval(Container.DataItem, "FolderName")), 10) %></asp:LinkButton>
                                                   </td>
                                                </tr>
                                            </ItemTemplate>
                                         
                                            <FooterTemplate>
                                              </table>
                                            </FooterTemplate>
                                          </asp:Repeater>
                        <webdiyer:AspNetPager ID="AspNetPagerFolder" runat="server" OnPageChanged="AspNetPagerFolder_PageChanged"
                        Width="90%" SubmitButtonText="到" ShowCustomInfoSection="Left" ShowBoxThreshold="3"
                        PageSize="16" AlwaysShow="True" HorizontalAlign="Right" Font-Size="X-Large" />
 </ContentTemplate>
 <Triggers>
   <asp:AsyncPostBackTrigger ControlID="btnExit2" EventName="Click" />
 </Triggers>
</asp:UpdatePanel>
... ...
<asp:Panel ID="pan" runat="server" style="display:none;">
 <table width="700" border="0" align="center">
  <tr>
    <td id="Drag">
       <table width="665" border="0" cellspacing="0" cellpadding="0">
          <tr>
            <td align=right>
              <font color=white size="Large">文件夹：</font>
            </td>
            <td align=left>
                <asp:DropDownList ID="ddlFolder" Font-Size="Large" runat="server">
                </asp:DropDownList>
            </td>
          </tr>
          <tr>
            <td align=right>
              <h2><font color=white>便笺：</font></h2>
            </td>
            <td align=left>
                <asp:TextBox ID="txtNote" TextMode=MultiLine Font-Size="Large" Width=500 Height=400 runat="server"></asp:TextBox>
            </td>
          </tr>
       </table>
    </td>
  </tr>
  <tr>
     <td bgcolor=aqua align=Center>
        <asp:Label ID="lblNoteId1" text="" Visible=false runat=server />
        <asp:Button ID="btnSave" runat="server" Text="保 存" Font-Size="Large" OnClick="btnSave_Click" />
        <asp:Button ID="btnDelNote2" runat="server" Text="删 除" Font-Size="Large" OnClick="btnDelNote2_Click" />
        <asp:Button ID="btnExit" runat="server" Text="取 消" OnClick="btnExit_Click" Font-Size="Large" />
     </td>
  </tr>
</table>
</asp:Panel>
<ajaxtoolkit:ModalPopupExtender ID="Modal" runat="server" TargetControlID="tmpButton"
    PopupControlID="pan" DropShadow="true"/>
<asp:Button ID="tmpButton" runat="server" Style="display: none" />

Answer 5

现在还是不行。
一开始点击RepeaterNote中的一行，弹出的Panel中的textBox，DROPDOWNLIST不显示指定内容(为空)。 
而在点击了RepeaterFolder中的一行后，再点击RepeaterNote中的一行，
弹出的Panel中的textBox为空，DROPDOWNLIST倒是有内容了！
（RepeaterNote的代码见1楼。）

Answer 6

不好意思,忘了说,问题在标题中! (顺便善意地嘲笑一下CSDN,标题也做得太隐蔽了吧!)

Answer 7

没有错误提示，就是弹出的Panel中的textBox，DROPDOWNLIST不显示指定内容(为空)？ 

Answer 8

跟踪过代码了,pan中的txtNote.Text明明就是有内容的,可是不是为何就是不显示出来！

Answer 9

zhlei616和fuda_1985，可以得到你们的进一步帮助吗？

Answer 10

好累，下断点到
  if (e.CommandName == "shownote") 
      { 
        lblNoteId1.Text = (String)e.CommandArgument; 
        CreateDDl(); 
看是否每次页面你能否进入该条语句
个人觉得你那个地方怪怪的

Answer 11

每次都可以进入该语句。内容一直到 弹出窗口的前一条语句 都没有丢失，怀疑AJAX控件的问题，但又不知怎样修改。
已经按zhlei616说的那样改了，却不完全有用。ddlFolder里有内容了，但SelectedValue没有定位到指定值，txtNote则根本就不显示内容！

Answer 12

可能有人不明白我的问题，当我点击RepeaterNote中的一行时，弹出一个POPUP PANEL，这个PANEL中有一个
txtNode和一个ddlFolder,按理他们应该显示出从数据库抓出来的内容，但是现在现象如34楼所述。

Answer 13

34楼的 “ddlFolder里有内容了，但SelectedValue没有定位到指定值”应为：
“ddlFolder里有内容了，但没有定位到指定值。一直跟踪到 弹出窗口的前一条语句 ddlFolder.SelectedValue都是正确的。”

Answer 14

楼上的，谢谢！愿闻其详！给点规范的.net代码嘛！

Answer 15

斑竹,最后更新是meiZiNick,meiZiNick 的发言哪里去了? 回复数44,怎么总共才41楼?

Answer 16

更新数据表后，在查询绑定前加一条 等待800毫秒的语句：
System.Threading.Sleep(800);