RadGrid FilterTemplate - RadComboBox Empty Line

[Sunny]

HI,

I want to display an empty line in the RadComboBox as a first element without checkbox in it. see the code below,

<Telerik:GridBoundColumn HeaderText="DEmo" DataField="DEmo">

<FilterTemplate>

<Telerik:RadComboBox ID="RadCombo1" runat="server" DataTextField="CMBITEM" DataValueField="CMBITEM" DataSourceID="SQLDS" SelectedValue='<%# TryCast(Container,GridItem).OwnerTableView.GetColumn("DEmo").CurrentFilterValue %>' AppendDataBoundItems="true" Width="100" OnClientDropDownClosing="mouseouts" EmptyMessage="">

<ItemTemplate>

<div  id="div1" onclick="StopPropagation(event)" />

<asp:CheckBox runat="server" ID="CheckBox1" Text='<%# Eval("CMBITEM") %>' onClick="onCheckBoxClick(this);" />

</ItemTemplate>

</Telerik:RadComboBox>

Withthis Combobox is displaying like

Combo: 

CheckBox with Item1

CheckBox with Item2

CheckBox with Item3

I want

Combo: 

[Empty Line]

CheckBox with Item1

CheckBox with Item2

CheckBox with Item3

If I use this code below,

    Protected Sub RadCombo1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs)

        Dim RAB As RadComboBox = DirectCast(sender, RadComboBox)

        RAB.Items.Insert(0, New RadComboBoxItem(""))

    End Sub

I am getting,

Combo: 

Checkbox [Empty Line]

CheckBox with Item1

CheckBox with Item2

CheckBox with Item3

[Sunny]

Any one?

[Shinu]

Hello,

Try adding HeaderTemplate for RadComboBox for showing an empty line in the RadComboBox as first item.

aspx:

<telerik:RadComboBox ID="RadCombo1" runat="server" DataTextField="CMBITEM" DataValueField="CMBITEM"
    DataSourceID="SQLDS" SelectedValue='<%# TryCast(Container,GridItem).OwnerTableView.GetColumn("DEmo").CurrentFilterValue %>'
    AppendDataBoundItems="true" Width="100" OnClientDropDownClosing="mouseouts" EmptyMessage="">
    <HeaderTemplate>
        <div id="div1" style="height: 15px;"> </div>
    </HeaderTemplate>
    <ItemTemplate>
       . . .
    </ItemTemplate>
</telerik:RadComboBox>

-Shinu.

[Sunny]

Thanks. But the radcombo shows the first item in the itemtemplate as default selected item!!

[Sebastian]

Hello TelNew,

Using the code implementation from your first post, try the following modification of the ItemTemplate of the combobox instance:

<ItemTemplate>
  <div  id="div1" onclick="StopPropagation(event)" />
  <asp:CheckBox runat="server" ID="CheckBox1" Text='<%# Eval("CMBITEM") %>' Visible='<%# IIF(Eval("CMBITEM") Is String.Empty, False, True) %>'  onClick="onCheckBoxClick(this);" />
</ItemTemplate>

Kind regards,
Sebastian
the Telerik team

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