Reinitializing property values on rebind

[Anne Chinn]

I have a RadGrid with a GridTemplateColumn that contains a UserControl that contains another RadGrid. In ItemCreate on the top-level grid (and I have also tried ItemDataBound) I set two properties on the nested grid.

 

protected void StudentGrid_ItemDataBound(object sender, GridItemEventArgs e)

 

{

 

if (e.Item is GridDataItem)

 

{

 

GridDataItem gdi = (GridDataItem)e.Item;

 

 

StudentTasksGrid grid = (StudentTasksGrid)gdi.FindControl("TaskGrid");

 

grid.StudentId =

Convert.ToInt64(gdi.GetDataKeyValue("COEUserID"));

 

grid.ContentArea = (

ContentAreaType)Convert.ToInt32(gdi.GetDataKeyValue("COEContentAreaTypeID"));

 

...
}

Inside the nested grid it's NeedDataSource event uses the ContentArea property to construct its query.

What I am having trouble with is refreshing the top-level grid (which I need to do after a separate dialog window closes). Currently I am calling the code-behind through

 

function refreshGrid(sender, eventArgs) {

 

$find(

"ctl00_MainContent_RadAjaxManager1").ajaxRequest("Rebind");

 

}

which resets the DataSource and call DataBind(). When I do this the nested grid's NeedsDataSource gets call before the top-level grid's ItemDataBound event gets called and so it doesn't have the value of the ContentArea to use in its query.

Can you suggest how I am supposed to refresh the top-level grid and make sure those properties are reset on the nested grid?

Thanks in advance,

Anne

[Anne Chinn]

I have investigated further...

On the first call to NeedDataSource on the top-level grid it call ItemCreated on the top-level grid for each row in the grid before calling NeedDataSource on the nested grid.

But on the rebind call to NeedDataSource on the top-level grid it calls ItemCreated only for the CommandItem, the Header, and a Filtering one that I don't remember the type, and then it calls NeedDataSource on the nested grid, and then continues calling ItemCreated on the top-level grid.

[Iana Tsolova]

Hello Anne,

You can try getting the desired key values directly in the nested grid NeedDataSource event handler instead. Your code should resemble the below:

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    RadGrid grid = sender as RadGrid;
    string contentArea = (grid.NamingContainer as GridDataItem).GetDataKeyValue("COEContentAreTypeID");  //you can debug and insure that the naming container of the grid is the parent grid item
}

Check it out and let me know if it works for you.

Regards,
Iana
the Telerik team