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動態按鈕命令事件不會觸發

2012-03-05 82 views
2

實際上，我正在使用asp.net和c＃開發動態模板。
我有一個主要的aspx頁面，並且在這個頁面中我有一個usercontrol頁面。在我的用戶控件中，我應該從XML文件中獲取數據，然後在列表視圖中動態創建一個表格，每行在最後一列包含編輯和刪除按鈕，如下圖所示。動態按鈕命令事件不會觸發

enter image description here

我已創建了ItemDataBound功能表裏面，你可以看到如下：

protected void lv_Uc_Module_ItemDataBound(object sender, ListViewItemEventArgs e) 
{ 
    if (e.Item.ItemType == ListViewItemType.DataItem && hid_SaveClicked.Value != "1") 
    { 
     XmlDocument xDocRead = new XmlDocument(); 
     xDocRead.Load(Server.MapPath("ModuleTemp.xml")); 
     string xModuleName = hid_ChooseModule.Value; 
     XmlNode xColCounter; 
     TableRow tr_DataBound = new TableRow(); 
     TableRow tr_Lv_Header = new TableRow(); 

     if (!"".Equals(hid_ChooseModule.Value)) 
     { 
      xColCounter = xDocRead.SelectSingleNode("ModuleTemp/" + xModuleName + "/List"); 
     } 
     else 
     { 
      xModuleName = xDocRead.SelectSingleNode("ModuleTemp").FirstChild.Name; 
      xColCounter = xDocRead.SelectSingleNode("ModuleTemp/" + xModuleName + "/List"); 
     } 
     int pkCounter = 0, nonPkCounter = 0, colCount = xColCounter.ChildNodes.Count; 
     string[] primaryKey = new string[30]; 
     string[] nonPrimaryKey = new string[colCount + 1]; 

     for (int i = 1; i <= colCount; i++) 
     { 
      if (xDocRead.SelectSingleNode("ModuleTemp/" + xModuleName + "/Edit/TableColumn" + i).Attributes.GetNamedItem("IsPrimaryKey").Value == "Y") 
      { 
       primaryKey[pkCounter] = xDocRead.SelectSingleNode("ModuleTemp/" + xModuleName + "/Edit/TableColumn" + i).Attributes.GetNamedItem("Name").Value; 
       pkCounter++; 
      } 
      else 
      { 
       nonPrimaryKey[nonPkCounter] = xDocRead.SelectSingleNode("ModuleTemp/" + xModuleName + "/Edit/TableColumn" + i).Attributes.GetNamedItem("Name").Value; 
       nonPkCounter++; 
      } 
     } 

     System.Data.DataRowView rowView = e.Item.DataItem as System.Data.DataRowView; 

     for (int i = 0; i < pkCounter + nonPkCounter; i++) 
     { 
      dataBoundTemp[rowCounter, i] = rowView[i].ToString(); 
     } 
     rowCounter++; 

     TableCell tc_Lv_Header = new TableCell(); 
     if (!"".Equals(hid_ChooseModule.Value)) 
     { 
      if (tempHeader == 0) 
      { 
       tempHeader++; 
       for (int i = 1; i <= pkCounter + nonPkCounter; i++) 
       { 
        tc_Lv_Header = new TableCell(); 
        Label lb = new Label(); 

        if (i <= pkCounter) 
        { 
         lb.Text = primaryKey[i - 1]; 
        } 
        else 
        { 
         lb.Text = nonPrimaryKey[i - pkCounter - 1]; 
        } 

        lb.ID = "lb" + i + "_Table_IphContainer"; 
        tc_Lv_Header.Controls.Add(lb); 
        tc_Lv_Header.CssClass = "th_ItemTemplate"; 
        tr_Lv_Header.Cells.Add(tc_Lv_Header); 
       } 

       tr_Lv_Header.Cells.Add(tc_Lv_Header); 

       table_Header.Rows.Add(tr_Lv_Header); 
       PlaceHolder th_Ph_Lv_Hedear = (PlaceHolder)lv_Uc_Module.FindControl("th_Ph_Lv_header"); 
       th_Ph_Lv_Hedear.Controls.Add(table_Header); 
      } 
     } 
     TableCell tc_DataBound = new TableCell(); 

     if (editTempSelection == e.Item.DataItemIndex) 
     { 
      for (int i = 1; i <= pkCounter + nonPkCounter; i++) 
      { 
       //tc_DataBound = new TableCell(); 
       tc_DataBound = new TableCell(); 
       TextBox tb = new TextBox(); 
       //(TextBox)e.Item.FindControl("td_EditTemp" + i); 
       tb.Width = 110; 
       tb.Text = rowView[i - 1].ToString(); 
       tb.ID = "td_EditTemp" + i + "_" + e.Item.DataItemIndex; 
       tc_DataBound.Controls.Add(tb); 
       tc_DataBound.CssClass = "td_Tb_ItemTemplate"; 
       tr_DataBound.Cells.Add(tc_DataBound); 
      } 
     } 
     else 
     { 
      for (int i = 1; i <= pkCounter + nonPkCounter; i++) 
      { 
       tc_DataBound = new TableCell(); 
       Label lb = new Label(); 
       //(Label)e.Item.FindControl("lb_ItemTemp" + i); 
       lb.Text = rowView[i - 1].ToString(); 
       lb.ID = "lb_ItemTemp" + i + "_" + e.Item.DataItemIndex; 
       tc_DataBound.Controls.Add(lb); 
       tc_DataBound.CssClass = "td_Lb_ItemTemplate"; 
       tr_DataBound.Cells.Add(tc_DataBound); 
      } 
     } 
     // add button to the columns 
     if (editTempSelection != e.Item.DataItemIndex) 
     { 
      tc_DataBound = new TableCell(); 
      Button btn_Edit = new Button(); 
      btn_Edit.ID = "btn_Edit"; 
      btn_Edit.CommandName = "Edit"; 
      btn_Edit.CssClass = "btn_Edit"; 
      //btn_Edit.CausesValidation = true; 
      tc_DataBound.Controls.Add(btn_Edit); 
      tr_DataBound.Cells.Add(tc_DataBound); 

      tc_DataBound = new TableCell(); 
      Button btn_Delete = new Button(); 
      btn_Delete.ID = "btn_Delete"; 
      btn_Delete.CommandName = "Delete"; 
      btn_Delete.CssClass = "btn_Delete"; 
      btn_Delete.CausesValidation = false; 
      btn_Delete.OnClientClick = "return confirm('Are you sure you want to delete this item?');"; 
      //btn_Delete.Command += new CommandEventHandler(lv_Uc_Module_ItemDeleting); 
      //btn_Delete.CommandName = e.Item.DataItemIndex.ToString(); 
      tc_DataBound.Controls.Add(btn_Delete); 
      tr_DataBound.Cells.Add(tc_DataBound); 
     } 
     else 
     { 
      tc_DataBound = new TableCell(); 
      Button btn_Update = new Button(); 
      btn_Update.ID = "btn_Update"; 
      //btn_Update.CommandName = "Update"; 
      btn_Update.CssClass = "btn_Update"; 
      //btn_Update.ValidationGroup = "VGEditTmp"; 
      //btn_Update.OnClientClick = "alert('hi');"; 
      btn_Update.Command += new CommandEventHandler(lv_Uc_Module_ItemUpdating); 
      btn_Update.CommandName = e.Item.DataItemIndex.ToString(); 
      tc_DataBound.Controls.Add(btn_Update); 
      tr_DataBound.Cells.Add(tc_DataBound); 
      hid_SaveClicked.Value = "1"; 

      tc_DataBound = new TableCell(); 
      Button btn_Cancel = new Button(); 
      btn_Cancel.ID = "btn_Cancel"; 
      btn_Cancel.CommandName = "Cancel"; 
      btn_Cancel.CssClass = "btn_Cancel"; 
      btn_Cancel.CausesValidation = false; 
      tc_DataBound.Controls.Add(btn_Cancel); 
      tr_DataBound.Cells.Add(tc_DataBound); 
      tr_DataBound.CssClass = "tr_Edit_ItemTemplate"; 
     } 

     // add columns to the row 
     tr_DataBound.Cells.Add(tc_DataBound); 
     table_Lv_ItemTemplate = (Table)e.Item.FindControl("Table_Lv_ItemTemplate"); 
     table_Lv_ItemTemplate.Rows.Add(tr_DataBound); 
     //"lb_ItemTemp" + i + "_" + e.Item.DataItemIndex;  "lb_ItemTemp" + rowCounter + "_" + e.Item.DataItemIndex 
    } 
}

當編輯按鈕，用戶點擊它來選定行的標籤更改爲文本框，你可以看到如下圖：

enter image description here

我的列表視圖代碼我S作爲如下：

<asp:ListView ID="lv_Uc_Module" runat="server" 
        OnItemEditing="lv_Uc_Module_ItemEditing" 
        OnItemDeleting="lv_Uc_Module_ItemDeleting" 
        OnItemCanceling="lv_Uc_Module_ItemCanceling" 
        OnItemDataBound="lv_Uc_Module_ItemDataBound" 
        OnSorting="lv_Uc_Module_Sorting"> 

         <LayoutTemplate> 
          <asp:Table runat="server" ID="table_Lv_Layout"> 
           <asp:TableRow runat="server" ID="tr_Table_Layout"> 
            <asp:TableCell runat="server" ID="td_Table_Layout"> 
             <asp:Table runat="server" ID="itemPlaceholderContainer"> 
              <asp:TableRow runat="server" ID="tr_Table_IphContainer"> 

               <asp:TableHeaderCell runat="server"> 
                <asp:PlaceHolder ID="th_Ph_Lv_header" runat="server"></asp:PlaceHolder> 
               </asp:TableHeaderCell> 
              </asp:TableRow> 
              <asp:TableRow runat="server"> 
               <asp:TableCell runat="server"> 

                <asp:PlaceHolder runat="server" ID="itemPlaceholder" /> 

               </asp:TableCell> 

              </asp:TableRow> 
             </asp:Table> 
            </asp:TableCell> 
           </asp:TableRow> 
           <asp:TableRow runat="server" ID="tr_Validate_Table_Layout"> 
            <asp:TableCell runat="server" ID="td_Validate_Table_Layout" HorizontalAlign="Center" BackColor="#CCCCCC"> 
             <asp:ValidationSummary ID="ValidationSummary1" runat="server" HeaderText="You received the following errors:" ShowMessageBox="true" ShowSummary="false" ValidationGroup="VGEditTmp" /> 
             <%--<asp:ValidationSummary ID="ValidationSummary2" runat="server" HeaderText="You received the following errors:" ShowMessageBox="true" ShowSummary="false" ValidationGroup="VGInsertTmp" />--%> 
            </asp:TableCell> 
           </asp:TableRow> 
          </asp:Table> 
          <br /> 
          <asp:DataPager ID="lv_DataPager" runat="server" PagedControlID="lv_Uc_Module" PageSize="25" OnPreRender="lv_DataPager_PreRender"> 
           <Fields> 
            <asp:NextPreviousPagerField ButtonType="Image" ShowFirstPageButton="true" ShowLastPageButton="true" FirstPageImageUrl="~/Images/First.png" LastPageImageUrl="~/Images/Last.png" NextPageImageUrl="~/Images/Next.png" PreviousPageImageUrl="~/Images/Previous.png" /> 
            <asp:TemplatePagerField> 
             <PagerTemplate> 
              <span style="color:Blue;"> 
              </span> 
             </PagerTemplate> 
            </asp:TemplatePagerField> 
           </Fields> 
          </asp:DataPager> 
         </LayoutTemplate> 

         <ItemTemplate> 
          <asp:TableRow runat="server"> 
           <asp:TableCell runat="server"> 

            <asp:Table runat="server" ID="Table_Lv_ItemTemplate"></asp:Table> 

           </asp:TableCell> 
           <asp:TableCell runat="server"> 
            <asp:Button ID="btn_Edit" runat="server" CommandName="Edit" Text="" CssClass="btn_Edit" CausesValidation="True" Visible="false" /> 
            <asp:Button ID="btn_Delete" runat="server" CommandName="Delete" Text="" CssClass="btn_Delete" CausesValidation="false" OnClientClick="return confirm('Are you sure you want to delete this item?');" Visible="false" /> 
           </asp:TableCell> 
          </asp:TableRow> 
         </ItemTemplate>

的問題是一旦上了保存按鈕，用戶點擊保存編輯後的項目數據庫的變化它從未執行ItemUpdating功能。我已將下面的代碼放在我的ItemDataBound函數中以調用ItemUpdating函數。

btn_Update.Command += new CommandEventHandler(lv_Uc_Module_ItemUpdating); 
btn_Update.CommandName = e.Item.DataItemIndex.ToString();

請指導我如何完成它。 我很欣賞你的考慮。

來源

2012-03-05 F Sh

回答

4

爲了評估回發事件，控件必須出現在頁面上。所以你需要在事件執行之前用動態按鈕重新生成列表。

看到http://msdn.microsoft.com/en-us/library/ms178472.aspx

Page_init將是一個好地方。否則，頁面不會找到觸發事件的控件。

protected void Page_Init(object sender, EventArgs e) 
{ 
    if (Page.IsPostback) 
    { 
    //bind your list so the buttons gets generated 
    } 
}

還檢查了「爲什麼動態控件消失在回發，而不是引發事件」 http://forums.asp.net/t/1186195.aspx/1

來源

2012-03-05 09:51:42 Elementenfresser

+0

感謝您的答覆。問題是一旦用戶點擊了我想要執行lv_Uc_Module_ItemUpdating函數的保存按鈕。在任何Postback或dataBind之前獲取文本框的值並保存它。但現在當用戶點擊保存按鈕時，我不能再訪問文本框來獲取它們的值並將其保存到數據庫中。 – 2012-03-06 05:23:17

+0

正常情況下，當用戶單擊保存按鈕時，會執行回發，導致服務器中的頁面生命週期以Page_Init等爲開頭。請參閱上面的鏈接。只有在此生命週期中，事件代碼纔會被執行。 – Elementenfresser 2012-03-06 07:42:01

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