[Solved] avoid postback

[Benjamin]

hi all,

how can i avoid postback when selecting a particular item in the list?

thanks

[Wenlong Yi]

AutoPostBack="false" ?

[Shinu]

Hi Benjamin,

I guess you want to prevent postback when selecting a particular item and want postback for all other items. If so you can try the following approach by invoking ajaxrequest/postback after checking the selected item from client side event OnClientSelectionIndexChanged. Here is the code that I tried.

ASPX:

<telerik:RadComboBox ID="RadComboBox1" runat="server" OnClientSelectedIndexChanged="OnClientSelectedIndexChanged" OnSelectedIndexChanged="RadComboBox1_SelectedIndexChanged">
    <Items>
        <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem1" Value="RadComboBoxItem1">
        </telerik:RadComboBoxItem>
        <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem2" Value="RadComboBoxItem2">
        </telerik:RadComboBoxItem>
        <telerik:RadComboBoxItem runat="server" Text="DoNot PostBack" Value="DoNot PostBack">
        </telerik:RadComboBoxItem>
    </Items>
</telerik:RadComboBox>
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
</telerik:RadAjaxManager>

JavaScript:

<script type="text/javascript">
function OnClientSelectedIndexChanged(sender, args)
{
    if(args.get_item().get_text() != "DoNot PostBack")
    {
       $find("<%=RadAjaxManager1.ClientID%>").ajaxRequestWithTarget("RadComboBox1", "PostBack");
    }
}
</script>

Note: I have not set the AutoPostBack property to True.

C#:

protected void RadComboBox1_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
{

}

-Shinu.

[Benjamin]

hi

thanks mates, much appreciated. and you  clearly understood my scenario and it is working good. thank you very much.

[Mani PC]

can you please provide me sample code for doing it on the code behind. I want to use VB.Net on the code behind to aviod screen filckering when selecting items from the radcombobox.

[Shinu]

Hi Mani,

I guess you want to prevent whole page refresh when selecting an item from RadComboBox. If so you can ajaxify the combobox either by using RadAjaxManager or RadAjaxPanel Controls. Checkout the following links to know more about these controls.
AJAX Manager
AJAX Panel

-Shinu.