[Solved] Using RadAjaxManager in Composite Server Control

[Cyber High]

I have a composite server control that I built using the previous version of the Rad Controls. It has an AjaxManager in it, that is created in the CreateChildControls event. My problem is that I get an "Object reference not set to an instance of an object" error, whenever I try to add ajax settings to the AjaxManager. I have tried doing so in the CreateChildControls event (where I did it with the previous version of RadControls) and in the PreRender. Both places return the same error.

How can I use the new AjaxManager in a composite server control and add ajax settings to it?

[Iana Tsolova]

Hi Guido Prambs,

Please review the following online help resources on how to update in composite controls and add ajax setting programmatically:

http://www.telerik.com/help/aspnet-ajax/ajxupdateincompositecontrol.html
http://www.telerik.com/help/aspnet-ajax/ajxaddajaxsettingsprogrammatically.html

Let us know if you need further assistance.

Regards,
Iana
the Telerik team

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[Cyber High]

Is there no way to include the AjaxManager in the Composite Control rather than passing a reference to one that exists on the page? This is not really the solution I was looking for.

I need to associate an AjaxRequest event with the AjaxManager. So if I am just passing a reference to an AjaxManager on the page, would I still be able to define the AjaxRequest event in the composite control, or would I have to add it to each calling page individually? And if it is possible to define the AjaxRequest in the composite control, then what do I do if the page's AjaxManager already has its own AjaxRequest event?

[Iana Tsolova]

Hi Guido,

You could add the RadAjaxManager directly in your composite control. I suggest that you add it on Init event handler of the control. Also you need to intercept the page's PreRender event in order to define the AjaxSettings there. For you convenience I have prepared a sample attached to this post.

Regarding your question about the AjaxRequest event:
You can implement one event handler of it on the page and one in the user control, and both handlers will be executed consequently without interfering with each-other.

Kind regards,
Iana
the Telerik team

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[Cyber High]

Thank you. This seems to work well with the testing I have done so far.