GridViewComboBoxColumn - Selection change?

[Jon]

Hi..
How do you handle the selection change of a GridViewComboBox? What event should I use? I Don't see a selectionchange.
When the value changes I want to populate other columns in the grid with portions of the data. Any idea how I can do that?
thanks in advance

[Pavel Pavlov]

Hi Jon,

The attached example demonstrates a way to handle selection changes  combo box.
Let me know if you find a trouble adapting this to your project.

Sincerely yours,
Pavel Pavlov
the Telerik team

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[Jon]

thanks again

[Paul Dyksterhouse]

There is a bug in the provided example. The Event fires when the cell enters edit mode not just when the selection actually changes.

[Pavel Pavlov]

Hi Paul Dyksterhouse,

Thanks for mentioning that. Actually the ComboBox does not exist until the cell enters edit mode. It is created on the fly ( in order to keep memory low and performance high) .

So when the Cell enters edit mode , the combo is created, and the selected value is being set to the value of the owning cell . This of course raises the selection changed event .

Although this is expected behavior , if this causes certain  complications  - we may think of a workaround for the certain scenario.

Regards,
Pavel Pavlov
the Telerik team

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[Brian]

If anyone else is interested in the 'workaround' mentioned, take a look at the e.RemovedItems logic in the following thread.

http://www.telerik.com/community/forums/wpf/gridview/combobox-selection-event-is-getting-fired-on-row-delete-row-add-into-datagrid.aspx

[Alex R.]

Paul,

I have a grid with multiple combo boxes and I was wondering how to get the combo box name?



private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    RadComboBox combo = (RadComboBox)sender;

    if (combo.Name == "Something")
    {
    }
}

Best regards,

Alex

[Matt]

Trogdor,

I think (I have not tested this) you might actually have to do something like:

string name = comboBox.Name;
if(name.Equals("SomeName"){ }

before you can do the comparison.  I would have to test that to be sure but for some reason I thought you had to actually get the name before you did the compare else it would never work out....not sure why I feel like I tried this before...

[Yoan]

Hello ,

You can set the UniqueName property of your ComboboxColumn:

<telerik:GridViewComboBoxColumn DataMemberBinding="{Binding CountryId}"
            UniqueName="Country"
           SelectedValueMemberPath="Id"
           DisplayMemberPath="Name" />

then you can check CurrnetColumn's name along with the RemoveItems.Count:

this.AddHandler(RadComboBox.SelectionChangedEvent, new System.Windows.Controls.SelectionChangedEventHandler(OnSelectionChanged)); 
       .
       .
       .

private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)

        {

            if (e.RemovedItems.Count > 0 && (e.Source as RadGridView).CurrentColumn.UniqueName == "Country")

            {

                //your code here

            }

        }

I hope this helps.

Regards,
Yoan
Telerik