RadControls for ASP.NET AJAX
The EmptyMessage property can be used when the AllowCustomText property is set to True (it is always true in a Load-on-Demand scenario). It sets a text in the input field of the combobox. This text disappears when the combobox gets the focus and appears again on blur if no item is selected.
Setting the EmptyMessage server-side
CopyC#
protected void Page_Load(object sender, EventArgs e)
{
RadComboBox1.EmptyMessage = "Please select a country";
}CopyVB.NET
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
RadComboBox1.EmptyMessage = "Please select a country"
End SubSetting the EmptyMessage client-side
CopyJavaScript
function onClientLoadHandler(sender, eventArgs) {
sender.set_emptyMessage("Please select a country");
}
Additionally, you can get the EmptyMessage property client-side by calling the get_emptyMessage() method of the combobox.
Controlling the appearance of the EmptyMessage text
To control the appearance of the EmptyMessage text you can change this CSS rule:
CopyCSS
.RadComboBox_Default .rcbInputCell .rcbEmptyMessage
{
color: #666; font-style: italic;
}Here Default is the name of the Skin of the combobox.