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Load data after filter activate

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DataFilter
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Saykor
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Saykor asked on 09 Aug 2012, 12:42 PM
Hi,
I have a radDataFilter and radGridView. On a first place data is not loaded. I want after user put a some filter ( example: username start with: sa) to load data from the server based on the filter condition and show it on the grid.

I not see how to do this. In FilterDescriptors_ItemChanged event i capture what user ask to filter, send a request to load a data but it not show on the grid.

Please advise more better way to do this.

Best regards,
Saykor

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Vlad
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answered on 09 Aug 2012, 12:44 PM
Hello,

 Can you post more info how the grid is bound in your case? Where you load the data once returned from the server?

Regards,
Vlad
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Saykor
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answered on 09 Aug 2012, 12:51 PM
<telerik:RadDataFilter Name="radDataFilter"
                                   Template="{StaticResource RadDataFilterTemplate}" 
                                   EditorCreated="OnRadDataFilterEditorCreated"
                                   telerikControls:StyleManager.Theme="Vista"
      Grid.Row="0"
                                   EditorTemplateSelector="{StaticResource MyEditorTemplateSelector}"
      Margin="1" />
                        <telerik:RadGridView Name="radGridView"
                                 telerikControls:StyleManager.Theme="Vista"
    Grid.Row="1"
    ColumnWidth="*"
    IsFilteringAllowed="False"
    CanUserFreezeColumns="False"
    RowIndicatorVisibility="Collapsed"
    AutoGenerateColumns="False"
                                 ItemsSource="{Binding FilteredSource, ElementName=radDataFilter}"           
    Margin="1">

void DataFilterExample_Loaded(object sender, RoutedEventArgs e)
        {

radDataFilter.FilterDescriptors.ItemChanged += new EventHandler<ItemChangedEventArgs<IFilterDescriptor>>(FilterDescriptors_ItemChanged);
radDataFilter.Source = AppCache.AppViewModel.Data; //data is ObservableCollection<Report>

//add few filters that user can use immediately when window is loaded
}

void FilterDescriptors_ItemChanged(object sender, ItemChangedEventArgs<IFilterDescriptor> e)
        {
            if (AppCache.AppViewModel.Data.Count == 0 && ((e.Item as FilterDescriptor).Member.Equals("Salesperson") || (e.Item as FilterDescriptor).Member.Equals("RelationShipmanager")))
            {
                App.LoadData(() =>
                    {
                        // this function start BackgroundWorker and fill AppCache.AppViewModel.Data
// return result in callback.
//maybe here i need to start some method to run the filter or show the data but not see how... if I just do:
//radDataFilter.Source = AppCache.AppViewModel.Data;
  //radGridView.ItemsSource = radDataFilter.FilteredSource;
//still not work
                    });
            }
        }
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Vlad
Telerik team
answered on 09 Aug 2012, 12:57 PM
Hello,

 Can you try to assign AppCache.AppViewModel.Data to the grid ItemsSource directly to see what will be the result?

Kind regards,
Vlad
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Saykor
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answered on 09 Aug 2012, 01:02 PM
I test this. If I  assign  it in FilterDescriptors_ItemChanged in call back function it still not work, not show the result.
after user change the filter again then result is showed. only first time not work.

But I load a data from our server only first time. Next when user change the filter will not load a data and filter the existing.
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Saykor
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answered on 09 Aug 2012, 01:41 PM
My mistake. I test with radGridView.ItemsSource = radDataFilter.FilteredSource;  in App.LoadData(() => and not work
Now i try radGridView.ItemsSource = AppCache.AppViewModel.Data; in App.LoadData(() => and data is showed on the grid and when user select other filter it work now 
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