Data Paging for hierarchical data (HierarchyChildTemplate )

[Igor]

Hi,

I have RadGridView incorporating RadGridView.HierarchyChildTemplate . Is that possible to define Data paging for both views, main and hierarchical one (hierarchical - i mean data shown by expanding rows of main view)?
just for info,  I'm using view data model rather than code behind.

Thanks,
        -Igor.

[Vlad]

Hello Igor,

 It will be no problem to use RadDataPager in HierarchyChildTemplate together with the child grid. 

Greetings,
Vlad
the Telerik team

[Igor]

Hi Vlad,
Thanks for the reply. I tried setting up Data Paging for childs but that had no effect on view. I can set data paging for main, parent view w/o issue but not for child ones. Here is my xaml , please see below (i guess the change is xaml driven, right?).
I'm not sure where should i define <telerik:RadDataPager ...   . If i define it after </telerik:RadGridView> I got paging in parent/main view. If i do this in other places I get some errors right away.

Thanks again.

/*****************************

<StackPanel>

        <telerik:RadGridView x:Name="RadGridView1" IsReadOnly="True" ShowGroupPanel="False" CanUserSortColumns="True" ItemsSource="{Binding somebinding, Mode=TwoWay}" AutoGenerateColumns="False">

            <telerik:RadGridView.ChildTableDefinitions>

                <telerik:GridViewTableDefinition />

            </telerik:RadGridView.ChildTableDefinitions>

            <telerik:RadGridView.Columns>

                <telerik:GridViewDataColumn DataMemberBinding="{Binding somebinding, Mode=TwoWay}" Width="120" Header=" someheader"/>

                <telerik:GridViewDataColumn DataMemberBinding="{Binding somebinding, Mode=TwoWay}" Width="40" Header="someheader"/>

                …some more columns

            </telerik:RadGridView.Columns>

 

                <telerik:RadGridView.HierarchyChildTemplate>

                <DataTemplate>

                    <telerik:RadGridView x:Name="RadGridView2" CanUserFreezeColumns="False" AutoGenerateColumns="False" ItemsSource="{Binding ChildModel, Mode=TwoWay}" IsReadOnly="True">

                        <telerik:RadGridView.Columns>

                            <telerik:GridViewDataColumn DataMemberBinding="{Binding somebinding, Mode=TwoWay}" Width="120" Header="someheader"/>

                            <telerik:GridViewDataColumn DataMemberBinding="{Binding somebinding, Mode=TwoWay}" Width="40" Header="someheader "/>

                                                                 … some more columns

                        </telerik:RadGridView.Columns>

                    </telerik:RadGridView>

                </DataTemplate>

            </telerik:RadGridView.HierarchyChildTemplate>

        </telerik:RadGridView>

    </StackPanel>

/***********************************

[Vlad]

Hi Igor,

 Here is an example how to define both child grid and pager:
<telerik:RadGridView.HierarchyChildTemplate>
   <DataTemplate>
     <Grid>
        <Grid.RowDefinitions>
           <RowDefinition />
           <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <telerik:RadGridView ItemsSource="{Binding ChildModel}" />
        <telerik:RadDataPager Source="{Binding ChildModel}" Grid.Row="1" />
      </Grid>
     </DataTemplate>
</telerik:RadGridView.HierarchyChildTemplate>

In this case however ChildModel should be IPagedCollectionView - for example QueryableCollectionView. 

I've noticed also that the master grid is inside StackPanel - this control will measure the grid with infinity and you will get serious performance problems (the grid will try to create all rows at once). 

Greetings,
Vlad
the Telerik team

[Igor]

Thanks again for the help!. I got paging working for both parent and child grids. However, I have performance issues in case when
there are thousands (like > 10) of rows in child view and I when try to expand that row with so many child’s. At the same time I see that IE memory(on client) is going up till IE eventually stops responding. I put master grid out of StackPanel is you advised.  What should I do in order to fix this? I guess I need something that would cause client to display predefined number of rows and holding only limited number of rows in memory on client. Is that possible?

 

-Igor.

[Vlad]

Hi Igor,

 Please define Height for the child grid as well since HierarchyChildTemplate will measure control with infinity as well. 

Greetings,
Vlad
the Telerik team

[Igor]

Thanks Vlad, I got it working right, appreciate your help very much!