I was able to reproduce the issue. It comes from allowing custom text, and using a submit button on the page instead of just the index change event. Here is an example user control that works everywhere except in IE9:
<%@ Control Language="C#" ClassName="RadComboTest" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
rcbExample.Items.Add(new RadComboBoxItem("Example One"));
rcbExample.Items.Add(new RadComboBoxItem("Example Two"));
rcbExample.Items.Add(new RadComboBoxItem("Example Three"));
rcbExample.Items.Add(new RadComboBoxItem("Example Four"));
rcbExample.Items.Add(new RadComboBoxItem("Example Five"));
}
protected void rcbExample_SelectedIndexChanged(object Sender, RadComboBoxSelectedIndexChangedEventArgs e)
{
lblValue.Text = rcbExample.Text;
}
protected void cmdTest_Click(object sender, EventArgs e)
{
lblValue.Text = rcbExample.Text;
}
</script>
<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
<script language="javascript" type="text/javascript">
function TestBoxEnterHandler(sender, e) {
if (e.get_domEvent().keyCode == 13) {
document.getElementById('<%= cmdTest.ClientID %>').click();
return false;
}
}
function TestBoxRequestingHandler(sender, eventArgs) {
if (sender.get_text().length < 3) {
eventArgs.set_cancel(true);
}
}
</script>
</telerik:RadScriptBlock>
<telerik:RadComboBox ID="rcbExample"
Height="200px"
Width="260px"
AllowCustomText="true"
OnClientKeyPressing="TestBoxEnterHandler"
OnSelectedIndexChanged="rcbExample_SelectedIndexChanged"
AutoPostBack="true"
Filter="Contains"
ItemsPerRequest="10"
runat="server" />
<asp:Button ID="cmdTest" runat="server" Text="Submit" onclick="cmdTest_Click" /><br />
<asp:Label ID="lblValue" runat="server" />
Is there a workaround? How do I fix it?