RadListView FindControl

[oprisan tudorel]

Hello!

I have again, a problem with the RadListView Control. This time, it looks pretty simple but i don't understand why id doesn't work.
So, to be short this is the problem:

I have a Radlistview, and in the ItemTemplate, i have all sort of things, labels, updatePanels, tables, etc. The RadListView works fine, but when i try to acces ANY element inside using

Dim Label1 as New Label = DirectCast(RadListView1.FindControl("LabelID_Here"), Label)

I get Label as Nothing, or any other elements for that matter.  Trust me i have tried different ways to access the controls but none succeeded(I also tried TryCast, and other methods suggested on the web).
The problem is that i try to update a panel wich is inside the RadListView, and i can't find it. From what i have seen the FindControl Method only works on RadListView related events such as ItemDataBound, preRender and so on. The problem is that i need the panel to update every 10 seconds or so, so this is unacceptable. 

What is the solution to accessing different controls inside the RadListView ?

Thank you,

and hope for a quick reply,

Tudorel.

[Nikolay Rusev]

Hello Tudorel,

If I understand your scenario correctly the controls are places in ItemTemplate of RadListView. If this is the case you should use FindControl in context of RadListViewItem, i.e <RadListViewItem instance>.FindControl(control id).

Regards,
Nikolay
the Telerik team

[oprisan tudorel]

Can u please provide an example?

Let's asume this situation.

<form id="form1" runat="server">
    <div>
        <telerik:RadListView ID="RadListView1" runat="server" DataSourceID="source">
        <ItemTemplate>
        <asp:Label ID="test_label" runat="server" Text='<%#Eval("FirstID") %>'></asp:Label>
        <asp:UpdatePanel ID="updatePanel1" runat="server" >
        <ContentTemplate>
        <asp:Label ID="x" runat="server" Text='<%#Eval ("SecondID") %>' />
        </ContentTemplate>
        </asp:UpdatePanel>
        </ItemTemplate>
        </telerik:RadListView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
            ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
            SelectCommand="SELECT * FROM [IdLIst] WHERE ([Published] = @Published)">
            <SelectParameters>
                <asp:Parameter DefaultValue="True" Name="Published" Type="Boolean" />
            </SelectParameters>
        </asp:SqlDataSource>
    </div>
    </form>

And the code behind:

Partial Class Test_radlistView
    Inherits System.Web.UI.Page

    Public Function DoSomething(ByVal Str As String) As Boolean

        'How do i access Label and update panel from here, assuming the datasource brings back several items
        Return Str
    End Function

End Class

So how do i access the controls inside? Because it's still unclear to me.

[Nikolay Rusev]

Hello Tudorel,

I am attaching sample project demonstrating how you can access and change value of control within ItemDataBound event.

Nikolay
the Telerik team

[oprisan tudorel]

As i wrote before i know how to acces the  control from within the itemdatabound event. What i need to know is how to do it outside any Listview events.  How do i acces the elements during a button function, or at page load?

[Princy]

Hello,

Try the following code snippet in external event to access controls in Itemtemplate of RadListView.

VB.Net:

Protected Sub Button1_Click(sender As Object, e As EventArgs)
    For Each item As RadListViewDataItem In RadListView1.Items
        Dim lb As Label = DirectCast(item.FindControl("test_label"), Label)
        'accessing Label
            'accessing UpdatePanel
        Dim panel As UpdatePanel = DirectCast(item.FindControl("updatePanel1"), UpdatePanel)
    Next
End Sub

Thanks,
Princy.

[Diptesh]

thanx