Find control in LayoutTemplate in UI for ASP.NET AJAX ListView

Erik Kleinreesink

10 posts

Member since:
Nov 2008

Posted 01 Feb 2010 Link to this post

Please telle me how I can find controls in the LayoutTemplate (see attached picture).
I need to set the text attributes for different languages.

1-2-2010-11-44-47.png

Sebastian

Admin

9934 posts

Posted 01 Feb 2010 Link to this post

Hi Erik,

Merely invoking the FindControl(labelId) method for the RadListView instance should be sufficient to locate the controls inside its layout template. This can be done inside the PageLoad handler of the page, for example:

C#
(RadListView1.FindControl("lblForum") as Label).Text = ....

VB.NET
CType(RadListView1.FindControl("lblForum"), Label).Text = .....

Best regards,
Sebastian
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Erik Kleinreesink

10 posts

Member since:
Nov 2008

Posted 01 Feb 2010 Link to this post

Thank you for your answer.
When I tried it, it didn't work. But I found out it depends on the page event in wich you use this statement.
De control is not yet defined in the page_load event.
When I used it in the RadListView1_PreRender event it worked fine.

slnavn2000

5 posts

Member since:
Nov 2008

Posted 21 Jun 2010 Link to this post

Hi All,

With this code, I could find control in LayoutTemplate,

protected void RadListView1_PreRender(object sender, EventArgs e)

{

Label lblTest= RadListView1.FindControl("lblTest") as Label;

lblTest.Text = "Hello";

}

but, when I using this to find control in EmptyDataTemplate, it return null, I don't know why?!!

Please give me some suggestion!

Thanks,

slnavn2000

Kiara

309 posts

Member since:
Jul 2006

Posted 21 Jun 2010 Link to this post

Listen for the ItemCreated server event of the listview for this purpose. This code worked as expected on my end:

    
                    <asp:ScriptManager ID="ScriptManager1" runat="server" /> 
        
                    <telerik:RadListView ID="RadListView1" DataSourceID="SqlDataSource1" runat="server" 
        
                        ItemPlaceholderID="ProductItemContainer" Skin=""   
        
                        onitemcreated="RadListView1_ItemCreated">  
        
                        <LayoutTemplate> 
        
                            <fieldset id="ProductItemContainer" runat="server" /> 
        
                        </LayoutTemplate> 
        
                        <ItemTemplate> 
        
                            <ul> 
        
                                <li> 
        
                                    <label> 
        
                                        Product name:</label> 
        
                                    <%#Eval("ProductName")%> 
        
                                </li> 
        
                                <li> 
        
                                    <label> 
        
                                        Quantity per unit:</label> 
        
                                    <%#Eval("QuantityPerUnit")%> 
        
                                </li> 
        
                                <li> 
        
                                    <label> 
        
                                        Unit price:</label> 
        
                                    <%# DataBinder.Eval(Container.DataItem, "UnitPrice", "{0:C}")%> 
        
                                </li> 
        
                                <li> 
        
                                    <label> 
        
                                        Units in stock:</label> 
        
                                    <%#Eval("UnitsInStock")%> 
        
                                </li> 
        
                                <li> 
        
                                    <label> 
        
                                        Discontinued:</label> 
        
                                    <%#Eval("Discontinued")%> 
        
                                </li> 
        
                            </ul> 
        
                        </ItemTemplate> 
        
                        <EmptyDataTemplate> 
        
                            <asp:Label ID="lblEmpty" runat="server" Text="No data" /> 
        
                        </EmptyDataTemplate> 
        
                    </telerik:RadListView> 
        
                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" 
        
                        ProviderName="System.Data.SqlClient" SelectCommand="SELECT TOP 3 ProductID, ProductName, QuantityPerUnit, UnitPrice, UnitsInStock, Discontinued FROM Products WHERE 1=0" />

    
                protected void RadListView1_ItemCreated(object sender, RadListViewItemEventArgs e)  
        
                {  
        
                    if (e.Item is RadListViewEmptyDataItem)  
        
                    {  
        
                        Label lbl1 = e.Item.FindControl("lblEmpty") as Label;  
        
                        lbl1.Text = "No data available";  
        
                    }  
        
                }

Kiara

slnavn2000

5 posts

Member since:
Nov 2008

Posted 21 Jun 2010 Link to this post

yeah, I can find control in ItemCreated event

thanks Kiara very much :)

howard

2 posts

Member since:
Dec 2018

Posted 06 May 2019 Link to this post

<telerik:RadListView ID="RLVTEST" runat="server" RenderMode="Lightweight" ItemPlaceholderID="itemPlaceholder" AllowPaging="True" PageSize="5"
DataKeyNames="G,M,GID" ClientDataKeyNames="G,M,GID" OnItemCommand="RLVTEST_ItemCommand" BorderWidth="0px">
<LayoutTemplate>
<div class="RadListView RadListView_<%# Container.Skin %>" style="border-width: 0px; width: 100%;">
<fieldset id="FieldSet1" style="border-width: 0px; width: 100%;">
<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
</fieldset>
</div>
</LayoutTemplate>
<ItemTemplate>

</ItemTemplate>
<EmptyDataTemplate>
<div >
<div class="rlvEmpty">
<asp:Label ID="LB_MSG" runat="server" Text="no data"></asp:Label>
</div>
</div>
</EmptyDataTemplate>
</telerik:RadListView>

How can i change Label:LB_MSG text from EmptyDataTemplate Code Behind???

Vessy

Admin

2330 posts

Posted 07 May 2019 Link to this post

Hi howard,

Using the approach suggested by Kiara will allow you to change the text of the label as follows:

<telerik:RadListView ID="RLVTEST" runat="server" RenderMode="Lightweight"

ItemPlaceholderID="itemPlaceholder" AllowPaging="True" PageSize="5"

DataKeyNames="G,M,GID" ClientDataKeyNames="G,M,GID"

OnItemCommand="RLVTEST_ItemCommand" BorderWidth="0px"

OnItemCreated="RadListView1_ItemCreated">

<LayoutTemplate>

<div class="RadListView RadListView_<%# Container.Skin %>" style="border-width: 0px; width: 100%;">

<fieldset id="FieldSet1" style="border-width: 0px; width: 100%;">

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

</fieldset>

</div>

</LayoutTemplate>

<ItemTemplate>

</ItemTemplate>

<EmptyDataTemplate>

<div>

<div class="rlvEmpty">

<asp:Label ID="LB_MSG" runat="server" Text="no data"></asp:Label>

</div>

</EmptyDataTemplate>

</telerik:RadListView>

protected void RadListView1_ItemCreated(object sender, RadListViewItemEventArgs e)

{

var type = e.Item.GetType().FullName;

if (e.Item is RadListViewEmptyDataItem)

{

Label lbl1 = e.Item.FindControl("LB_MSG") as Label;

lbl1.Text = "No data available";

}

Regards,
Vessy
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howard

2 posts

Member since:
Dec 2018

Posted 09 May 2019 in reply to Vessy Link to this post

Oh my goodness, it's Work!!!!!!!! I truly appreciate your help!!!

Vessy

Admin

2330 posts

Posted 09 May 2019 Link to this post

Hi,

You are welcome, howard - I am glad my reply helped you to achieve your goal :)

Regards,
Vessy
Progress Telerik

Get quickly onboarded and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.