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#1 farmar290  Icon User is offline

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call Updating function on dynamically created button click in listview

Posted 06 March 2012 - 03:03 AM

actually, i'm developing dynamic template using asp.net and c#.
in my usercontrol page i have a listview which is include dynamically created table. once the user edited any of the rows and press the save button before the PageLoad or PageInit i want to execute the ItemUpdating function to save the data to the database.
my listview code is as follow:

<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: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>


and my ItemDataBound function which is include the dynamic table code is as follow:

protected void lv_Uc_Module_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (tempDataBound == 0 && !"".Equals(hid_ChooseModule.Value) && hid_SaveClicked.Value != "1")
    {
        XmlDocument xDocRead = new XmlDocument();
        xDocRead.Load(Server.MapPath("ModuleTemp.xml"));
        lv_Uc_Module_DataBind("");

        Table table_Lv_ItemTemplate = (Table)e.Item.FindControl("Table_Lv_ItemTemplate");
        table_Lv_ItemTemplate.Controls.Clear();
        rowCounter = 0;
        tempDataBound++;
    }

    if (e.Item.ItemType == ListViewItemType.DataItem )
    {
        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();
                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";
            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?');";
            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.CssClass = "btn_Update";
            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);

    }
}


the problem is once the user click on the save button the ItemUpdating function never executed. i have used bellow method to call the function on save button click but does not work.
btn_Update.Command += new CommandEventHandler(lv_Uc_Module_ItemUpdating);
btn_Update.CommandName = e.Item.DataItemIndex.ToString();



could you pplease guide me what should i do to prevent from pageLoad and call the ItemUpdating function on save button click. appreciate your consideration.

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Replies To: call Updating function on dynamically created button click in listview

#2 Nakor  Icon User is offline

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Re: call Updating function on dynamically created button click in listview

Posted 06 March 2012 - 06:25 AM

Couple of quick questions. You have

OnItemEditing="lv_Uc_Module_ItemEditing" 
OnItemDeleting="lv_Uc_Module_ItemDeleting"
OnItemCanceling="lv_Uc_Module_ItemCanceling" 
OnItemDataBound="lv_Uc_Module_ItemDataBound"



Why not use the OnItemUpdating event? Give your button CommandName of "Update" and it will call that event, no need to set a Command event for it.

I see your LayoutTemplate and ItemTemplate, where's the EditTemplate? How is the user updating data?

Also, if you're loading your data into your ListView during the ItemDatabound event then you are loading it too late in the Page Life Cycle. At the point that ItemDatabound is called your data for that item should already be loaded since that event is called after the item is bound to the data. You should probably look at loading your xml into the ListView during the Page_Init events. Make sure that the controls in the ListView are created with the same ID's and in the same order everytime the table gets loaded or when asp.net looks at the viewstate for that ListView it will think that it is a new ListView rather than the same one being reloaded.

Also, the ItemUpdating event will always be called after the Page_Load event, that's just the order of things in the Page Life Cycle for an ASP.NET application. After all, the controls have to be created before they are available to work with, right?

More info on the Page Life Cycle.

This post has been edited by Nakor: 06 March 2012 - 06:26 AM

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