Load On Demand - ExpandAll

[Jon]

Hi..
I'm using LoadOnDemand...  I turn it off after my data is loaded...but as soon as Expand the Nodes .... I get the animation on my children.

what am I doing wrong... thanks again


...data loaded...

 

this.InBox_Header.IsLoadingOnDemand = false;

 

 

 this.InBox_Header.ExpandAll();

 

[Tihomir Petkov]

Hi Jon,

Excuse me for the delayed answer. The most probable reason why you get the loading animation on the child nodes is because you have set the IsLoadOnDemandEnabled property of the entire TreeView control to "true". This way the property is inherited by all items in the control and even though you disable the animation on the root item, its children still have their IsLoadOnDemandEnabled property set to "true".

You may find the help article and load on demand exmaple below useful:
http://www.telerik.com/help/silverlight/radtreeview-features-load-on-demand.html
http://demos.telerik.com/silverlight/#TreeView/LoadOnDemand

Let me know if the above info does not help and you need further assisstance with this issue.

Sincerely yours,
Tihomir Petkov
the Telerik team

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[Pedro]

Hi, I having the problem rather.
I have TreeView loading on demand but I can't see the expander animation. Why is not runing the animation?

This is my xaml:

<Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadTreeView Height="200" HorizontalAlignment="Left" Margin="12,12,0,0" Name="treeView1" VerticalAlignment="Top" Width="120" IsVirtualizing="True">
            <telerik:RadTreeViewItem Name="treeViewItem" Header="Teste" IsLoadOnDemandEnabled="True" LoadOnDemand="treeViewItem_LoadOnDemand"/>
        </telerik:RadTreeView>
        <Button Content="Populate Tree" Height="23" HorizontalAlignment="Left" Margin="203,38,0,0" Name="button1" VerticalAlignment="Top" Width="107" Click="button1_Click" />

    </Grid>

        

Best regards,
Gonçalo

 

[Alex Fidanov]

Hi Gonçalo,

Can you please provide us with more information on the issue you are having? The RadTreeViewItems's expand animation is showing up every time when I tested this on my end. Is it possible to provide us with a sample project that we could run and experience the issue ourselved?

Greetings,
Alex Fidanov
the Telerik team

[Pedro]

Hi,

I tried to attach my visual studio project (zip file) but it gives me error: "File is not of correct type. Try again" 

My file is less than 2MB. 

Is possible to attach zip files?

regards,
Gonçalo

[Alex Fidanov]

Hello Gonçalo,

In the forums, only image files are allowed to be attached. You could craete a support ticket and upload the sample in the ticket and we will look into it with higher priority, or you could upload the project on a temporary internet storage and provide us with a link to it.

Regards,
Alex Fidanov
the Telerik team

[Pedro]

Hi,


I already solved the problem. I was populating the treeView manually and now I am using DataBinding. Using DataBinding it works very much better. :)

But now I having another problem: How can I unchek item using ContainerBinding?

<telerik:ContainerBindingCollection x:Key="BindingsCollection">
            <telerik:ContainerBinding PropertyName="CheckState" Binding="{Binding CheckState, Mode=TwoWay}" />
        </telerik:ContainerBindingCollection>

<telerik:HierarchicalDataTemplate x:Key="FirstGroupTemplate" ItemTemplate="{StaticResource VesselsTemplate}" ItemsSource="{Binding Vessels}" telerik:ContainerBinding.ContainerBindings="{StaticResource BindingsCollection}">
            <TextBlock Text="{Binding Name}" />
        </telerik:HierarchicalDataTemplate>

Am I doing it right? If I change the CheckState in my data object it will be updated in treeView? I need to refresh?

Regards,
Gonçalo

[Alex Fidanov]

Hello Gonçalo,

Assuming that you have a CheckState property on your business object and the class implements INotifyPropertyChanged interface, when the value of that property changes, it will propagate the changes to the RadTreeViewItem and its check state will change accordingly.

Greetings,
Alex Fidanov
the Telerik team

[Pedro]

I have that implemented. I'm using virtualization, maybe is that the problem. Because if I collapse and expand the node the chekbox update the state.

regards,
Gonçalo

[Alex Fidanov]

Hello Gonçalo,

I am attaching a project demonstrating a binding between the CheckState of the business object and the CheckState property of the RadTreeViewItem. You can see in the example that both changes to the CheckState property through the UI or through the button's click are reflected accordingly by the RadTreeView. Let me know if you have questions on the sample.

All the best,
Alex Fidanov
the Telerik team

[Pedro]

Hi,

You have the same problem that I had. If you uncheck the item 1 in collpased mode. The childs (item 1.1, item 1.2 item 1.3) remains in check state. Can you test there?

regards,
Gonçalo

[Alex Fidanov]

Hello Gonçalo,

I see this behavior now. This is caused by the use of ContainerBinding. This is a known issue for us and we are wokring on resolving it. You can check its progress from here.

Regards,
Alex Fidanov
the Telerik team