[Solved] HowTo Save and reload the Last Expanded Structue of a hierachical RadGrid

[Fabian]

Hello Support and Telerik Team,

I need to solve the following Grid behavior.

I  use a hierachical RadGrid to display a Overview in a GRid  with 4 Layers. On selecting a Item I redirect to the related Detail Page, If i go back from there, I need to restore the last Grid View

The Rad Grid is bound with 4 SQLDatasoures, one for each Grid / Subgrid Layer

I need to save an restore
> selected Page
> PageSize
> Last Search
> Last Hierachical Structure  ( all expanded Items in the last View )

The First ponits are solved, but I find no good way to solve the  last Point with accepable Performance.

I need to save each expaned Item of the Grid, and when the User come backs to page, I need to restore the last View.

I tryed to use the Itemcommand Event to save the Expaned Items with HierachicaltemIndex.
I tryed to use the radGrid_Prerender Event to restore the view.

1. Problem
> The First Expand Layer Action fires no Postback, because the Data seems to be Precached in the Grid on First Load
> The Sec Expand Layer fires a Postback, but I wonder how to find the Partent Hierachicalindex

In the Prerender i walk through all Hierachical Items, and If the Hierachical Index is in  my Saved List, I set Expanded = true.
Because the first layer makes no Postback, It is never in the  List and I can't expand it, If I expand a Child, the Partent is not expaned automatically.

One Point which makes the behavior mre difficult is, that the Overview and the Detail is in one aspx  Page with a Muliview Control in a Updatepanel. Switching between Master and detail makes only a simpel Postback, no complete Reload of the hole page-

Is there a known best Practise to solve my behavior?



Kind Regards


  

[Tsvetoslav]

Hello Fabian ,

Please, review the following code library example that should give you directions on how to implement the last requirement of your scenario (here).

Regards,
Tsvetoslav
the Telerik team

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