RadControls for ASP.NET AJAX FooterTemplate element of RadComboBox, allows the footer of the items in the drop-down list, to be customized.
The footer is especially useful if the item template displays attributes in multiple columns, although it can be used with any RadComboBox item style.
It could be used even when RadComboBox does not have an ItemTemplate defined.
Just like the ItemTemplate, the FooterTemplate can include any HTML element.
The following example shows how to create a multi-column RadComboBox with a footer that labels the columns of each item.
 Note |
|---|
Both, the FooterTemplate and ItemTemplate, lay out items using a table that fixes column width,
so that the footer and items line up properly. |
CopyASPX
<telerik:radcombobox
id="RadComboBox1"
width="420"
height="190px"
runat="server"
highlighttemplateditems="true"
datasourceid="SqlDataSource1"
onitemdatabound="RadComboBox1_ItemDataBound">
<FooterTemplate>
<table style="width: 415px; text-align: left">
<tr>
<td style="width: 125px;">Company Name</td>
<td style="width: 125px;">City</td>
<td style="width: 125px;">Title</td>
<td style="width: 40px;" align="right">
<img alt="" src="img/help.gif" />
</td>
</tr>
</table>
</FooterTemplate>
<ItemTemplate>
<table style="width: 415px; text-align: left">
<tr>
<td style="width: 125px;">
<%# DataBinder.Eval(Container.DataItem"CompanyName") %>
</td>
<td style="width: 125px;">
<%# DataBinder.Eval(Container.DataItem"City") %>
</td>
<td style="width: 125px;">
<%# DataBinder.Eval(Container.DataItem"ContactTitle") %>
</td>
<td style="width: 40px;"></td>
</tr>
</table>
</ItemTemplate>
</telerik:radcombobox>In order to include data associated with every column in the text of the RadComboBox item,
add an ItemDataBound event handler to the RadComboBox.
CopyC#
protected void RadComboBox1_ItemDataBound(object sender, RadComboBoxItemEventArgs e)
{
e.Item.Text = ((DataRowView)e.Item.DataItem)["CompanyName"].ToString() + "; " +
((DataRowView)e.Item.DataItem)["City"].ToString() + "; " +
((DataRowView)e.Item.DataItem)["ContactTitle"].ToString();
}CopyVB.NET
Protected Sub RadComboBox1_ItemDataBound(ByVal sender As Object, ByVal e As RadComboBoxItemEventArgs)
e.Item.Text = (DirectCast(e.Item.DataItem, DataRowView))("CompanyName").ToString() + "; " +
(DirectCast(e.Item.DataItem, DataRowView))("City").ToString() + "; " +
(DirectCast(e.Item.DataItem, DataRowView))("ContactTitle").ToString()
End Sub
Defining FooterTemplates at run-time
CopyASPX
<telerik:radcombobox
id="RadComboBox2"
runat="server"
autopostback="true">
</telerik:radcombobox>CopyC#
protected override void OnInit(EventArgs e)
{
RadComboBox2.FooterTemplate = new FooterTemplate();
base.OnInit(e);
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
RadComboBox2.Items.Add(new RadComboBoxItem("RadComboBoxItem1"));
RadComboBox2.Items.Add(new RadComboBoxItem("RadComboBoxItem2"));
}
RadComboBox2.DataBind();
}
class FooterTemplate : ITemplate
{
public void InstantiateIn(Control container)
{
HtmlTable table = new HtmlTable();
HtmlTableRow row = new HtmlTableRow();
HtmlTableCell cell = new HtmlTableCell();
cell.InnerText = "Value";
row.Controls.Add(cell);
HtmlTableCell cell1 = new HtmlTableCell();
cell1.InnerText = "Text";
row.Controls.Add(cell1);
table.Controls.Add(row);
container.Controls.Add(table);
}
}CopyVB.NET
Protected Overloads Overrides Sub OnInit(ByVal e As EventArgs)
RadComboBox2.FooterTemplate = New FooterTemplate()
MyBase.OnInit(e)
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If Not Page.IsPostBack Then
RadComboBox2.Items.Add(New RadComboBoxItem("RadComboBoxItem1"))
RadComboBox2.Items.Add(New RadComboBoxItem("RadComboBoxItem2"))
End If
RadComboBox2.DataBind()
End Sub
Class FooterTemplate Implements ITemplate
Public Sub InstantiateIn(ByVal container As Control) Implements ITemplate.InstantiateIn
Dim table As New HtmlTable()
Dim row As New HtmlTableRow()
Dim cell As New HtmlTableCell()
cell.InnerText = "Value"
row.Controls.Add(cell)
Dim cell1 As New HtmlTableCell()
cell1.InnerText = "Text"
row.Controls.Add(cell1)
table.Controls.Add(row)
container.Controls.Add(table)
End Sub
End ClassAccessing controls in FooterTemplate
You can find any control embedded in the RadComboBox' FooterTemplate, like:
CopyC#
Label lbl = (Label)RadComboBox1.Footer.FindControl("footerLabel");
lbl.Text = "This is label in the footer";CopyVB.NET
Dim lbl As Label = DirectCast(RadComboBox1.Footer.FindControl("footerLabel"), Label)
lbl.Text = "This is label in the footer"See Also