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[Solved] Stop Postback clientside on Rad ComboBox

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Yash asked on 20 Jul 2008, 03:16 PM

Hi,
I'm new to Telerik controls and I'm quite enjoying it!

Right now, I'm facing a problem which I really hope someone could help me solve :)

I'm trying to use javascript to stop the postback when selecting an item in a RadComboBox whose AutoPostBack is true..., while still allowing the selected item in the combo box to change...

So from what I understood in the documentation, I can stop it using "return false" in ClientSelectedIndexChanging, but that is not working...

I wrote a test page to check whether the problem was specific to my application, but here also it does not work...

What am I doing wrong?

Thanking you before hand,
Cheers,
¥@$#.

    
            <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title>Test Page</title> 
        
                <script type="text/javascript"> 
        
                    function check(item) 
        
                    { 
        
                        alert('test'); 
        
                        return false; 
        
                    } 
        
                </script> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <div> 
        
                    <asp:ScriptManager ID="ScriptManager1" runat="server"> 
        
                    </asp:ScriptManager> 
        
                    <telerik:RadComboBox ID="RadComboBox1" Runat="server"  
        
                        onclientselectedindexchanging="check"  
        
                        onselectedindexchanged="RadComboBox1_SelectedIndexChanged1"  
        
                        AutoPostBack="True" > 
        
                        <Items> 
        
                            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem1" Value="1" /> 
        
                            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem2" Value="2" /> 
        
                            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem3" Value="3" /> 
        
                            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem4" Value="4" /> 
        
                            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem5" Value="5" /> 
        
                        </Items> 
        
                        <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation> 
        
                    </telerik:RadComboBox> 
        
                    <br /> 
        
                    <br /> 
        
                    <br /> 
        
                </div> 
        
                <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
        
                </form> 
        
            </body> 
        
            </html>

4 Answers, 1 is accepted

answered on 21 Jul 2008, 06:53 AM

Hello Yash,

You use RadComboBox for ASP.NET AJAX, so the correct way to stop the postback is:

    
            function OnClientSelectIndexChanging(sender,eventarqs)  
        
            {  
        
                eventarqs.set_cancel(true);  
        
            }

I suggest you read more about client side of RadCombobox here.

You can check this code library as well: RadComboBox - Allow only certain items to postback

Regards,
Rosi
the Telerik team

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