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How to refer to label control inside itemtemplate

Posted on 2010-11-20

3 solutions

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Last Modified: 2012-06-27

I have the following mark up and code(I have problem in teh code side)

<asp:ListView ID="ListView1" DataSourceID="SqlDataSource1" Visible="false" DataKeyNames="UnitID" ConvertEmptyStringToNull="true" runat="server" >

<LayoutTemplate>
<table cellpadding="2" runat="server" id="tblExcel" width="640px" cellspacing="0">
<tr runat="server" id="itemPlaceholder" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr id="Tr1" runat="server">
<%--<td>
<asp:CheckBox ID="CheckBox1" runat="server" />
</td>--%>
<td>
<asp:Label ID="lblUnitID" runat="server" Text='<%#Eval("UnitID") %>' />
</td>
<td>
<asp:Label ID="ParishLabel" runat="server" Text='<%# Eval("School") %>' />

</td>
<td>

<asp:Button ID="SelectButton" runat="server" Text="Select"
CommandName="Select"
CommandArgument='<%#Eval("School")%>' />

</td>
<td>
<asp:Label ID="Label2" runat="server" Text=""></asp:Label>

</td>

</tr>
</ItemTemplate>

IN code behind I do to refer to it but getting Object not set...

Dim lblDone As Label = FindControl("Label2")
lblDone.Text = "Done"

I d like to see ways to access the label.

thnks

Comment

Question by:zachvaldez

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7 Comments

LVL 12

Expert Comment

by:ErezMor

ID: 341812762010-11-20

findcontrol as you used, looks under the main form, since your label is a child of the listview, you need to write ListView1.FindControl....

LVL 52

Expert Comment

by:Carl Tawn

ID: 341813092010-11-20

Actually that won't work either. The ListView can display a series of records, so you need to use FindControl on a specific item. For example, it you wanted to get the label in the first row of the ListView you would use:

Dim lblDone As Label = CType(ListView1.Items(0).FindControl("Label2"), Label)

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LVL 21

Assisted Solution

by:Alfred1

Alfred1 earned 332 total points

ID: 341815012010-11-20

---------> I d like to see ways to access the label.

You can also try using a FindControlRecursive function if you want. See the function code below. You can then call the function something like this:

Dim lblDone As Label = CType(FindControlRecursive(ListView1,"Label2"), Label)
lblDone.Text = "Done"

Private Function FindControlRecursive(ByVal ctrl As Control, ByVal id As String) As Control
        If ctrl.ID = id Then
            Return ctrl
        End If

        For Each ctrlChild As Control In ctrl.Controls
            Dim ctrlRecursive = FindControlRecursive(ctrlChild, id)
            If Not ctrlRecursive Is Nothing Then
                Return ctrlRecursive
            End If
        Next

        Return Nothing
    End Function

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Author Comment

by:zachvaldez

ID: 341890012010-11-22

Either way, code works but does not display the Label "DONE" in the row I assinged for <TD> </TD>

BTW, there are several rows, How would I reference which row or index Im clicking.

LVL 52

Expert Comment

by:Carl Tawn

ID: 341899392010-11-22

Have you got your ListView sat inside an AJAX updatepanel or anything like that?

LVL 3

Assisted Solution

by:Sokrates

Sokrates earned 332 total points

ID: 341958672010-11-23

Try this

Since you are using CommandName="Select", on the Command event you should be able to get the row/item from the ListView property SelectedIndex something like this:

((Label)ListView1.Rows[ListView1.SelectedIndex].FindControl("Label2")).Text = "DONE";
or
((Label)ListView1.Items[ListView1.SelectedIndex].FindControl("Label2")).Text = "DONE";

LVL 21

Accepted Solution

by:Alpesh Patel

Alpesh Patel earned 336 total points

ID: 342175692010-11-26

dim lblDone as Label = Label2

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