Usage Eval / Datafield in Grid ItemTemplate

[Dave Crack]

Hi,
i've searching a while in the Forum but i couldn't find how to use Eval within a ItemTemplate.

Whats working:

<telerik:GridTemplateColumn UniqueName="infos" DataField="id" HeaderText="Infos">
<ItemTemplate>
Brand: <%#Eval("brandId")%>
<%=BrandDDL.Items[0].Text%>
</ItemTemplate>
</telerik:GridTemplateColumn>

But when I try to use the ID from Eval to get the corresponding Text like this

<telerik:GridTemplateColumn UniqueName="infos" DataField="id" HeaderText="Infos">
<ItemTemplate>
Brand: <%#Eval("brandId")%>
<%=BrandDDL.Items[(int)Eval("brandId")].Text%>
</ItemTemplate>
</telerik:GridTemplateColumn>

I get a InvalidOperationException Context Runtime Error Eval(), XPath() and Bind().
Is there any way to get the ID from the DataField of the current Row within ItemTemplate to work
with it in <% %> and also make some if(!string.IsNullOrEmpty(id)){}...

Thanks.

[Princy]

Hi,

You could try the following code and check whether it helps you.

 <telerik:GridTemplateColumn UniqueName="infos" DataField="id" HeaderText="Infos">
         <ItemTemplate>
              Brand:
              <%#Eval("ID") %>
               <%#BrandDDL.Items[Convert.ToInt32(Eval("ID"))].Text%>
          </ItemTemplate>
 </telerik:GridTemplateColumn>

Regards,
Princy.

[Dave Crack]

Nope. Have you tried it? I get only:
Data binding methods such as Eval (), XPath () and Bind () can be used only in the context of a data-bound control.

Is there maybe any example where <%#Eval("xyz")%> was used within <ItemTemplate>

This ist also not working
<%
if(Eval("xyz") != null)
{
}
%>

Same Exception:

System.Web.UI.Page.GetDataItem()
System.Web.UI.TemplateControl.Eval(String expression)
ASP.Test_aspx.__Render__control22(HtmlTextWriter __w, Control parameterContainer) in d:\net3.5\Test.aspx:Zeile 269.
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

[Tsvetoslav]

Hi Dave,

Did you change your expression evaluation tags from <%=................%> to <%#......................%> as Princy has indicated? Attached is a sample that demonstrates that the binding expressions work all right within the ItemTemplate of a GridTemplateColumn.

Hope it helps.

Regards,
Tsvetoslav
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.