Maintain html content state while switching between tabs

[Oleg]

Hello :)

In our application we have tab-view design. The application overall is very complex and resource-consuming. Every tab has it's own html content, which is placed in html place holder. 

The problem: when a person switches between tabs the html content is not persisted and for instance if a person had some form with ricj text editor and he or she entered a lot text, this text would be gone. 
I know there is KeepContentInMemory property which does what I need, but it's good only for simple and light-weight applications, in my case it breaks the interface leaving the partial content of different pages on the screen.

During further investigation we have set up a virtual machine with old Silverlight 3 version and telerik controls for Silverlight 3 and above described problem appears to be gone. 
Unfortunately we're not able to use Silverlight 3 controls as we migrated our development and productions environment to Silverlight 5.

Could advise us about the differences in implementation of RadHtmlPlaceHolder for Silverlight 3 and Silverlight 5?
Is there completely other way rendering the html content inside Silveright 5 control with help of Telerik controls?

Any help is greatly appreciated :)

[Tina Stancheva]

Hi Oleg,

Are you using the RadTabControl? If you are, then please have in mind that the control by default does not save the state of its unselected tabs. And in order to change that behavior, you need to set the IsContentPreserved property to True. This feature is further described in this tutorial.

If you're not using our RadTabControl, can you give it a try and also preserve its content. Please let us know if this helps.

Regards,
Tina Stancheva
Telerik

[Oleg]

Hi Tina,

Unfortunately setting IsContentPreserved property to True did not help. I still see that our page is refreshed.
Yes I use RadTabControl. 

Again, aha is the difference between RadHtmlPlaceHolder implementations for Silverlight 3 and Silverlight 5?
I wonder, because it seems I don't have such problem with the old version.

Still need your help :)

[Petar Mladenov]

Hello Oleg,

This is a complex issue due to the integration of these two controls TabControl and HtmlPlaceHolder. Furthermore the KeppingContent in memory and preserving the SL Content are independend features too complex on their own. This is just to say that it is hard to say whether exactly the issue is in the HTMLPlaceholder or in the RadTabControl or whether it is a limitation in the SL Framework. We can only say that we are aware of this issue and it is logged previously in our PITS.
During the years, RadTabControl is the control from these two that has evolved a lot. But this is just a  shoot in the dark. We need a much deeper investigation to perform to answer precisely.

Regards,
Petar Mladenov
Telerik