Question

Urgent - Javascript error with Telerik control

Asked by: centdevs

Telerik is closed today and I have an error I can't figure out.  

The error is "null is null or not an object."
This error comes up when the page loads.  Sometimes you can refresh the page and the error will go away, so sometimes it works and sometimes it doesn't.  
I have this script in an .ascx file - and I put it in the parent page as well to see if that helped (made no difference).
It's very strange that sometimes this works fine, and sometimes it doesn't.  Any ideas?

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">  
<script type="text/javascript"> 
function GetRadRotator()  
{
    var oRadRotator = $find('<%=radRotateNews.ClientID %>');
    return oRadRotator;     
}
function StartPlay()  
{  
    var oRotator = GetRadRotator();  
    if (oRotator.get_rotatorType() == Telerik.Web.UI.RotatorType.AutomaticAdvance)  
    {  
        oRotator.start();  
    }  
    else  
    {  
        oRotator.set_rotatorType(Telerik.Web.UI.RotatorType.AutomaticAdvance);  
        oRotator.startAutoPlay();  
    }  
    return false;  
}
</script>  
</telerik:RadCodeBlock>

                                  
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Asked On
2009-01-01 at 08:45:12ID24019455
Topics

.NET

,

Programming for ASP.NET

Participating Experts
4
Points
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Comments
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Answers

 

by: centdevsPosted on 2009-01-01 at 08:46:03ID: 23275334

(The error appears on line 11)

 

by: chilternPCPosted on 2009-01-01 at 09:00:02ID: 23275367

The error is "null is null or not an object."  - usually means the include file with the objects has not loaded.

 

by: WhiteMeatPosted on 2009-01-01 at 09:01:21ID: 23275371

I don't think the rotator has a get_rotatorType method.

I'd check this page:

http://demos.telerik.com/aspnet-ajax/Rotator/Examples/ClientAPIControl/DefaultCS.aspx#

Take a look at the StartRotator function that's defined in the .aspx tab.

 

by: ArlowinPosted on 2009-01-01 at 09:04:17ID: 23275376

It might be a timing issue.

IE: The radRotator isn't actually on the page when the function executes, but sometimes it is.

Have you tried using window.onload=StartPlay(): to get it to execute after the page is loaded?

 

by: centdevsPosted on 2009-01-01 at 09:04:25ID: 23275378

That method is in one of their .js files that I believe is supposed to be automaticall referenced when you add a script manager to the page.  I've tried copying the js file over anyway and putting the js file in:

<script src="radrotator.js" type="text/javascript" language="javascript"></script>

That didn't work :(

 

by: centdevsPosted on 2009-01-01 at 09:07:02ID: 23275384

Arlowin, I just tried that and now I get:
sys.argumentexception does not derive from sys.component

 

by: ArlowinPosted on 2009-01-01 at 09:12:59ID: 23275405

are you using the radScriptManager or the normal scriptmanager that comes with the ajax core?

 

by: centdevsPosted on 2009-01-01 at 09:16:56ID: 23275415

I'm using a regular scriptmanager, but I did try to add a telerik script manager.  I'm trying now to add script references.

 

by: ArlowinPosted on 2009-01-01 at 09:25:00ID: 23275437

Generally I would recommend using the telerik script manager and add it by clicking the smart tag on the scriptmanager and selecting convert to telerik script manager.

 

by: centdevsPosted on 2009-01-01 at 09:27:23ID: 23275440

Yeah it's not making a difference though unfortunately.

 

by: spdr870Posted on 2009-01-03 at 04:58:02ID: 23285022

I also have had this error using the radrotator. Maybe my findings help you a bit. When I used a percentage in the size I got this error. When using pixels as the size, it worked fine. Strange and annoying. I think its a bug.

 

by: centdevsPosted on 2009-02-26 at 03:46:43ID: 23743579

There was a bug with the Telerik software, it's been fixed.

20120131-EE-VQP-002

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