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Server-Side Find control RadListView on InsertItemTemplate

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Valerio
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Valerio asked on 20 Dec 2018, 01:21 PM

Hi,

 

I am trying to access a control in InsertItemTemplate.

 

On EditTemplate is fine, I use:

var Ctlcst_costru_civmec_note = (RadTextBox)CtlCstCostruzione.EditItems[0].FindControl("Ctlcst_costru_civmec_note");

 

But I am not able to find the same control on insert one. How can I do?

 

Thx,

Valerio

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Marin Bratanov
Telerik team
answered on 23 Dec 2018, 10:39 AM
Hello Valerio,

The best place to do that is the ItemDataBound event as shown in the following article: https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/rows/accessing-cells-and-rows#accessing-controls-in-editinsert-mode

That said, if you need to run some code outside of the grid, you can use the GetInsertItem method of the table view. For example:

protected void btn1_Click(object sender, EventArgs e)
{
    if (rg1.MasterTableView.IsItemInserted)
    {
        GridEditableItem item = rg1.MasterTableView.GetInsertItem();
        if (item != null)
        {
            RadTextBox rtb = item.FindControl("rtbInTemplate") as RadTextBox;
            if (rtb != null)
            {
                rtb.Text = DateTime.Now.ToString();
            }
        }
    }
}

with markup like this (the control ID is there, nothing else significant):

<asp:Button Text="get the textbox" ID="btn1" OnClick="btn1_Click" runat="server" />
<telerik:RadGrid runat="server" ID="rg1" OnNeedDataSource="rg1_NeedDataSource" AllowPaging="true">
    <MasterTableView CommandItemDisplay="Top">
        <Columns>
            <telerik:GridTemplateColumn>
                <InsertItemTemplate>
                    <telerik:RadTextBox runat="server" ID="rtbInTemplate"></telerik:RadTextBox>
                </InsertItemTemplate>
            </telerik:GridTemplateColumn>
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

and a little bit of dummy data to get it running:

protected void rg1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    (sender as RadGrid).DataSource = Enumerable.Range(1, 300).Select(o => new { ID = o, someName = "name " + o });
}


Regards,
Marin Bratanov
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Valerio
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answered on 23 Dec 2018, 05:10 PM

Hi Marin,

 

it works on RadGrid, but how do I manage for a RadListView?

I am not able to figure it out.

 

Thx for help,

Valerio

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Marin Bratanov
Telerik team
answered on 24 Dec 2018, 09:13 AM
My bad, Valerio, for some reason I thought this is about a grid.

Generally, for a listview the same approach about using its events applies: https://docs.telerik.com/devtools/aspnet-ajax/controls/listview/templates/accessing-controls#accessing-controls-in-the-edititemtemplateinsertitemtemplate

When using an external button, instead of a method, there is the .InsertItem property:

protected void btn1_Click(object sender, EventArgs e)
{
    if(RadListView1.InsertItem != null)
    {
        TextBox tb = RadListView1.InsertItem.FindControl("TextBox11") as TextBox;
        if(tb != null)
        {
            tb.Text = DateTime.Now.ToString();
        }
    }
}

where this can run on the following simplified version of our online demo for automatic CRUD operations:

<asp:Button Text="get insert item textbox" ID="btn1" OnClick="btn1_Click" runat="server" />
<telerik:RadListView ID="RadListView1" RenderMode="Lightweight" DataSourceID="SqlDataSource1" runat="server"
    ItemPlaceholderID="ProductItemContainer" DataKeyNames="ProductID" AllowPaging="True">
    <ItemTemplate>
        <fieldset class="itemFieldset">
            <%# Eval("ProductName") %>
        </fieldset>
    </ItemTemplate>
    <EditItemTemplate>
        <fieldset class="itemFieldset">
            <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ProductName") %>'></asp:TextBox>
        </fieldset>
    </EditItemTemplate>
    <InsertItemTemplate>
        <fieldset class="itemFieldset">
            <asp:TextBox ID="TextBox11" runat="server" Text='<%# Bind("ProductName") %>'></asp:TextBox>
        </fieldset>
    </InsertItemTemplate>
    <LayoutTemplate>
        <fieldset />
        <legend>RadListView bound to SqlDataSource</legend>
        <table class="layoutTable">
            <tr>
                <td class="button">
                    <telerik:RadButton RenderMode="Lightweight" ID="Button1" runat="server" CommandName="InitInsert" Visible="<%# !Container.IsItemInserted %>"
                        Text="Add new product">
                    </telerik:RadButton>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Panel ID="ProductItemContainer" runat="server">
                    </asp:Panel>
                </td>
            </tr>
            <tr>
                <td>
                    <telerik:RadDataPager RenderMode="Lightweight" ID="RadDataPager1" runat="server" PagedControlID="RadListView1"
                        PageSize="3">
                        <Fields>
                            <telerik:RadDataPagerButtonField FieldType="FirstPrev"></telerik:RadDataPagerButtonField>
                            <telerik:RadDataPagerButtonField FieldType="Numeric"></telerik:RadDataPagerButtonField>
                            <telerik:RadDataPagerButtonField FieldType="NextLast"></telerik:RadDataPagerButtonField>
                        </Fields>
                    </telerik:RadDataPager>
                </td>
            </tr>
        </table>
        </fieldset>
    </LayoutTemplate>
</telerik:RadListView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    DeleteCommand="DELETE FROM [Products] WHERE [ProductID] = @ProductID" InsertCommand="INSERT INTO [Products] ([ProductName], [SupplierID], [CategoryID], [QuantityPerUnit], [UnitPrice], [UnitsInStock], [UnitsOnOrder], [ReorderLevel], [Discontinued]) VALUES (@ProductName, @SupplierID, @CategoryID, @QuantityPerUnit, @UnitPrice, @UnitsInStock, @UnitsOnOrder, @ReorderLevel, @Discontinued)"
    SelectCommand="SELECT * FROM [Products]" UpdateCommand="UPDATE [Products] SET [ProductName] = @ProductName, [SupplierID] = @SupplierID, [CategoryID] = @CategoryID, [QuantityPerUnit] = @QuantityPerUnit, [UnitPrice] = @UnitPrice, [UnitsInStock] = @UnitsInStock, [UnitsOnOrder] = @UnitsOnOrder, [ReorderLevel] = @ReorderLevel, [Discontinued] = @Discontinued WHERE [ProductID] = @ProductID">
    <DeleteParameters>
        <asp:Parameter Name="ProductID" Type="Int32"></asp:Parameter>
    </DeleteParameters>
    <UpdateParameters>
        <asp:Parameter Name="ProductName" Type="String"></asp:Parameter>
        <asp:Parameter Name="SupplierID" Type="Int32"></asp:Parameter>
        <asp:Parameter Name="CategoryID" Type="Int32"></asp:Parameter>
        <asp:Parameter Name="QuantityPerUnit" Type="String"></asp:Parameter>
        <asp:Parameter Name="UnitPrice" Type="Decimal"></asp:Parameter>
        <asp:Parameter Name="UnitsInStock" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="UnitsOnOrder" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="ReorderLevel" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="Discontinued" Type="Boolean"></asp:Parameter>
        <asp:Parameter Name="ProductID" Type="Int32"></asp:Parameter>
    </UpdateParameters>
    <InsertParameters>
        <asp:Parameter Name="ProductName" Type="String"></asp:Parameter>
        <asp:Parameter Name="SupplierID" Type="Int32"></asp:Parameter>
        <asp:Parameter Name="CategoryID" Type="Int32"></asp:Parameter>
        <asp:Parameter Name="QuantityPerUnit" Type="String"></asp:Parameter>
        <asp:Parameter Name="UnitPrice" Type="Decimal"></asp:Parameter>
        <asp:Parameter Name="UnitsInStock" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="UnitsOnOrder" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="ReorderLevel" Type="Int16"></asp:Parameter>
        <asp:Parameter Name="Discontinued" Type="Boolean"></asp:Parameter>
    </InsertParameters>
</asp:SqlDataSource>

Regards,
Marin

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