Refreshing On Interval Clears Content

[Mirek]

I have a simple update on interval application (pretty much same as this demo: http://demos.telerik.com/aspnet-ajax/notification/examples/updateinterval/defaultcs.aspx ).

 

The problem is if you set the updateinterval for a length of time less than the autoclosedelay it blanks out the popup (clears the content of the literal).  In other words if I check for new messages while a message is already visible, even if there are no new messages, the page posts back and my message is empty.

Is there some easy way to get around this or do I have to do something like store the value in a session/page variable etc.?

[Marin Bratanov]

Hello Mirek,

The demo shows such a way—intercepting the OnClientUpdated event, checking for the information the server returns through the Value property and making a decision based on that. For example, you can call the hide() method of the notification if there is no new data.

Otherwise, as long as you return some text, the notification will not be empty. Here is a small example that illustrates this:

<telerik:RadNotification ID="RadNotification1" runat="server" OnCallbackUpdate="RadNotification1_CallbackUpdate" AutoCloseDelay="0" VisibleOnPageLoad="true" LoadContentOn="TimeInterval" UpdateInterval="2000" Width="200" Height="100"></telerik:RadNotification>

protected void RadNotification1_CallbackUpdate(object sender, RadNotificationEventArgs e)
{
    (sender as RadNotification).Text = DateTime.Now.ToString();
}

Regards,

Marin Bratanov
Telerik by Progress