Pregunta

I have the following Telerik RadListBox, with a template.

<tel:RadListBox ID="ToList" runat="server" DataValueField="Key" EmptyMessage="No Items" style="width:300px;">
    <ItemTemplate>
        #<asp:Literal runat="server" Text='<%# Eval("AcctNumber") %>' />
        <div>
            <asp:Literal runat="server" Text='<%# Eval("Amount", "{0:C2}") %>' />
        </div>
    </ItemTemplate>
</tel:RadListBox>

However, I'd like to insert a blank "- Select -" item at the beginning. I tried adding an item like:

ToList.Items.Insert(0, new RadListBoxItem("- Select -", ""));

However, this adds an item using the given template as the user interface; I'd like it ot use my text. Is this possible to do?

¿Fue útil?

Solución

Luckily, there is an easy solution. Put an inline conditional statement in the ItemTemplate, as follows:

<ItemTemplate>
<ul>
    <li class="col1"><%# Container.DataItem != null ? DataBinder.Eval(Container.DataItem, "CompanyName") : DataBinder.Eval(Container, "Text") %></li>
    <li class="col2"><%# DataBinder.Eval(Container.DataItem, "City") %></li>
    <li class="col3"><%# DataBinder.Eval(Container.DataItem, "ContactTitle") %></li>
</ul>
</ItemTemplate>
<Items>
   <telerik:RadComboBoxItem Text="Select a country" />
</Items>

http://www.telerik.com/help/aspnet-ajax/combobox-insert-default-item-when-databinding.html

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