Error:While clicking on radcombox

[Ram]

Hi,

I am getting following javascript error while clicking on combo box

 'top' is null or not an object
but with up and down arrows i am able to change the items in combo box
I am declared combo as follows:and this combo is in popup window

<telerik:RadComboBox ID="rad1" runat="server">

   <Items>
     <telerik:RadComboBoxItem Text="1" Value="1" />

<telerik:RadComboBoxItem Text="2" Value="2" />

<telerik:RadComboBoxItem Text="3" Value="3" />

<telerik:RadComboBoxItem Text="4" Value="4" />

<telerik:RadComboBoxItem Text="5" Value="5" />

<telerik:RadComboBoxItem Text="6" Value="6" />

<telerik:RadComboBoxItem Text="7" Value="7" />

<telerik:RadComboBoxItem Text="8" Value="8" />

<telerik:RadComboBoxItem Text="9" Value="9" />

</Items>

   </telerik:RadComboBox>

can any one help in solving the issue?

Thanks,

[Kate]

Hello Ram,

It seems that due to the javascript error that you encounter you are not able to expand and consequently select an item from the RadComboBox control. Can you please provide more details on your scenario since the code that you have pasted it not enough for us to reproduce the issue? For example it could be the definition of the javascript function that you use and how you call it? 

Regards,
Kate
the Telerik team

[Wesley]

Hi Kate, 

Any update on this? I have exact same issue as Ram has. 
We just update ASP.NET AJAX to 2013.3.1324.40 the latest version. But when click the combobox on IE8, the Jscript run time error is thrown:

Microsoft JScript runtime error: 'top' is null or not an object

if(this._getHeaderElement()){c+=this._getHeaderElement().offsetHeight;
}if(this._getFooterElement()){c+=this._getFooterElement().offsetHeight;
}if(this.get_moreResultsBoxElement()){c+=this.get_moreResultsBoxElement().offsetHeight;
}return c;
};
b.RadComboBox.prototype._calculateItemsHeight=function(){var d=0;
var e=this.get_items().get_count();
for(var c=0;
c<e;
c++){d+=this.get_items().getItem(c).get_element().offsetHeight;
}return d;
};
b.RadComboBox.prototype._getOffsetParentOffset=function(c){var h=0;
var f=0;
var d=a(c.offsetParent);
if(d.css("position")!="static"){var g=d.offset();
h=g.top; <<<<<<<<<---------------------------------------------------------------------------------------------------------------------------

Hope to hear from you soon. Thanks.

Wesley Fang

[Kate]

Hi Wesley,

Can you clarify what is the version of the Telerik controls that you are upgrading from so I can get a better understanding of your particular scenario? I tested the code provided by Ram and everything seems to be working as expected from my side. Can you let me know if you use the same markup code and if there are any differences? 

Regards,
Kate
Telerik

[Wesley]

Hi Kate,

Thank you for the reply at first.
It turns out that my website page structure has layout issue. After I create a master page including all header and footer, it works well with Telerik control now. 

Regards,

Wesley Fang