Rendezvous with technology

When you set Object/Collection as a source for an AdvancedDataGrid to display the source in a Hierarchical manner, the AdvancedDataGrid.dataProvider will return an instance of IHierarchicalCollectionView because internally the source is used to construct a HierarchicalCollectionView which is returned via the dataProvider property.

What if, you want the original source from this IHierarchicalCollectionView. Well, there are some API’s for achieving this -


// First, get the HierarchicalData used to create the HierarchicalCollection
var hd:IHierarchicalData = IHierarchicalCollectionView(adg.dataProvider).source;



//From the HierarchicalData, get the source collection/object
var source:Object = hd.getRoot();


Here is a sample.
Source here.

There is a post in Flex component Yahoo group on how to show a 3-state checkbox in an AdvancedDataGrid.

It has been implemented for the Flex Tree Control in the Flex cookbook.

I thought lets write a similar example for AdvancedDataGrid. I made some changes in the original sample and here it is; working for the AdvancedDataGrid control.

Example here

Source here

This example shows how AdvancedDataGrid can be configured to show summary with the Group node.

Here, I’m using GroupingCollection to calculate the Summary with summaryPlacement being “group”. Then using groupLabelFunction in AdvancedDataGrid and returning the Group Node’s value plus the Summary value.

Source mxml is located here.

The GroupLabel specified while creating a GroupingCollection can be accessed while displaying summaries in AdvancedDataGrid.

Although, accessing the GroupLabel in summary rows can be quite a tedious task but it can be very useful.

Here is a sample. In this sample, the Group name is displayed in the summary rows along with the value for the summary.

Source -

• Application file (mxml)
• SummarRenderer (mxml)

Filtering of Hierarchical Data in AdvancedDataGrid is quite straight forward.

Assign the filter function to the ADG’s dataProvider and call refresh() -

// assign filter function to
//the AdvancedDataGrid's dataProvider
IHierarchicalCollectionView(
        adg.dataProvider).filterFunction =
                                 myFilterFunc;

// refresh the ADG's dataProvider
IHierarchicalCollectionView(
        adg.dataProvider).refresh();

Here is a Sample

And the Source