[Solved] how to update grid values with javascript then persist over postback

[Kevin]

My grid has a mastertable and 1 detail table. 
The master table has heirachyLoadMode="ServerBind"
The detailtable columns has ItemTemplates containing a RadNumericTextBox controls (1 per column).
The master table values are essentially an aggregation of the detail rows.  I have RadNumericTextBox ClientEvents-OnValueChanged javascript that aggregates the detail values and updates the the value in the master row.

That all works.  My problem is when a new row is expanded, a postback occurs and I loose the grid values I calculated and set via javascript.  How do I persist those values?  The values in the RadNumericTextBox controls are persisted so EnableViewState can be eliminated.

This is how I update the master rows:
masterView.getCellByColumnUniqueName(masterView.get_dataItems()[masterRowIndex], "MyColName").innerHTML = parseInt(detailTotal / detailRowCount);
How do I persist that change during postback?  Am I not setting the value correctly?  Do I have add postback code to copy HTML values to a saved datasource then rebind?

I cannot use heirachyLoadMode="Client" because loading takes way too long.
I am using ItemTemplates instead of EditTemplates because I don't want the user to have to click edit on each detail row they want to edit; that would slow them down a lot.

[Eyup]

Hi Kevin,

Thank you for contacting us.

You can use one of the following approaches to achieve the requested functionality:

1. Preserve the values using HiddenField control and re-assign them on every postback:
http://msdn.microsoft.com/en-us/library/75x4ha6s%28v=vs.100%29.aspx

2. Implement Batch updates:
   Batch Server Update    
   Performing Batch Updates
For putting all items in edit mode:
   http://www.telerik.com/help/aspnet-ajax/grid-put-all-items-in-edit-mode-no-additional-rebind.html
   http://demos.telerik.com/aspnet-ajax/calendar/examples/datepicker/shareddatepicker/defaultcs.aspx?product=grid

Hope this helps. Please let us know if you need further assistance.

Greetings,
Eyup
the Telerik team