[Solved] Selected Item on page load

[Mark Jakes]

Hello Gurus  ;-)

I have a radgridview on my page called PageStockSheet, the itemssource derived from a RIA services class 'product'.

As part of the page I have a button that passes the grids current selected item to a new page, PageCosts, i.e. a 'product' object.

private void Button_Click_1(object sender, RoutedEventArgs e)
{
      navService.Navigate( new PageCosts(((product)griddocs.SelectedItem)));
}

The new page is loaded...

 

public PageCosts( product selectedProd )
{
     selectedproduct = selectedProd;
     InitializeComponent();
}

 

 

Some editing takes place on the new page and the user then clicks on a button to return to PageStockSheet, passing the original 'selectedproduct' as a parameter:

private void buttonReturn_Click(object sender, RoutedEventArgs e)
{
     navService.Navigate(new PageStocksheet(selectedproduct));
}

When PageStockSheet is loaded, I try to select the product in the constructor using the following:

product selectedonstart;
 

public PageStocksheet( product selectedprod) 

{

    InitializeComponent();

    selectedonstart = selectedprod;

    Loaded += new RoutedEventHandler(PageStocksheet_Loaded); 

}

  

void PageStocksheet_Loaded(object sender, RoutedEventArgs e) 

{

   var query = from s in context.GetProductsQuery() 

               orderby s.PDQVSRef descending 

               select s; 

  

    LoadOperation<product> loadopdocs = context.Load(query);

    loadopdocs.Completed += new EventHandler(loadopdocs_Completed); 

}

void loadopdocs_Completed(object sender, EventArgs e) 

{

    LoadOperation<product> loadop = sender as LoadOperation<product>; 

    if (loadop.Error != null) 

    {

        RadWindow.Alert(loadop.Error.Message); 

        return; 

    }

  

    griddocs.ItemsSource = loadop.Entities;

    if (selectedonstart != null) 

    {

        griddocs.SelectedItem = selectedonstart;

        // griddocs.SelectedItem is always NULL, why?

  

        griddocs.ScrollIntoView(griddocs.SelectedItem);

    }    

}

Why is griddocs.SelectedItem always null?

Can someone guide me to the right way to selecting a row of a RadGridView when loading a page correctly?

Thanks

Mark

[Milan]

Hello Mark Jakes,

This is a know issue which is cause by the fact that the actual data binding of the grid will occur when the grid is first shown. For the time being you can move the code that restored the SelectedItem to an event handler of the DataLoaded event. 

Regards,
Milan
the Telerik team

[Mark Jakes]

Hello Milan

Thanks for the reply.  I had already tried subscribing to the DataLoaded event without much success:

void loadopdocs_Completed(object sender, EventArgs e)
{
    LoadOperation<product> loadop = sender as LoadOperation<product>;

    if (loadop.Error != null)
    {
        RadWindow.Alert("There was an error");
        RadWindow.Alert(loadop.Error.Message);
        return;
    }

    LayoutRoot.DataContext = loadop.Entities;
    griddocs.ItemsSource = loadop.Entities;

    griddocs.DataLoaded += (not, used) =>
    {
        if (selectedonstart != null)
        {
            griddocs.SelectedItem = selectedonstart;
            griddocs.ScrollIntoView(griddocs.SelectedItem);
            LayoutRoot.DataContext = griddocs.SelectedItem;
        }
    };
 }

If I debug the above code, the program never hits the dataloaded event so the call to griddocs.SelectedItem is never called.

The first record is always selected.

Any clues?

Mark

[Milan]

Hello Mark Jakes,

DataLoaded event should be called when new ItemsSource is assigned and I am surprised to heat that this is not the case. Cold we have a look at the application?

Greetings,
Milan
the Telerik team