GroupingCollection2  - AS3 Flex

Specifies the Grouping instance applied to the source data. Setting the grouping property does not automatically refresh the view, so you must call the refresh() method after setting this property.

Related API Elements

The source collection containing the flat data to be grouped. If the source is not a collection, it will be auto-wrapped into a collection.

Array of SummaryRow instances that define any root-level data summaries. Specify one or more SummaryRow instances to define the data summaries, as the following example shows:

      <mx:AdvancedDataGrid id="myADG" 
         width="100%" height="100%" 
         initialize="gc.refresh();">        
         <mx:dataProvider>
             <mx:GroupingCollection2 id="gc" source="{dpFlat}">
                 <mx:summaries>
                     <mx:SummaryRow summaryPlacement="last">
                         <mx:fields>
                             <mx:SummaryField2 dataField="Actual" 
                                 label="Min Actual" summaryOperation="MIN"/>
                             <mx:SummaryField2 dataField="Actual" 
                                 label="Max Actual" summaryOperation="MAX"/>
                         </mx:fields>
                       </mx:SummaryRow>
                     </mx:summaries>
                 <mx:Grouping>
                     <mx:GroupingField name="Region"/>
                     <mx:GroupingField name="Territory"/>
                 </mx:Grouping>
             </mx:GroupingCollection2>
         </mx:dataProvider>        
         
         <mx:columns>
             <mx:AdvancedDataGridColumn dataField="Region"/>
             <mx:AdvancedDataGridColumn dataField="Territory_Rep"
                 headerText="Territory Rep"/>
             <mx:AdvancedDataGridColumn dataField="Actual"/>
             <mx:AdvancedDataGridColumn dataField="Estimate"/>
             <mx:AdvancedDataGridColumn dataField="Min Actual"/>
             <mx:AdvancedDataGridColumn dataField="Max Actual"/>
         </mx:columns>
      </mx:AdvancedDataGrid>

Related API Elements

The timer which is associated with an asynchronous refresh operation. You can use it to change the timing interval, pause the refresh, or perform other actions. The default value for the delay property of the Timer instance is 1, corresponding to 1 millisecond.

Constructor.

If the refresh is performed asynchronously, cancels the refresh operation and stops the building of the groups. This method only cancels the refresh if it is initiated by a call to the refresh() method with an asynch argument of true, corresponding to an asynchronous refresh.

Returns the parent of a node. The parent of a top-level node is null.

Parameters

Return super.source, if the grouping property is set, and an ICollectionView instance that refers to super.source if not.

Applies the grouping to the collection. The collection does not detect changes to a group automatically, so you must call the refresh() method to update the collection after setting the grouping, source, or summaries properties. You also call the refresh() method when you modify a GroupingField of the collection, such as by changing the caseInsensitive, compareFunction, or groupingFunction properties.

The refresh() method can be applied synchronously or asynchronously.

When refresh() is called synchronously, all groups and summaries are updated together before the method returns. That means your application cannot perform other processing operations for the duration of the call. A client should wait for a CollectionEvent event with the value of the kind property set to CollectionEventKind.REFRESH to ensure that the refresh() method completed.

In asynchronous refresh, all groups and summaries are updated individually. The refresh() method returns before the groups and summaries are updated so that your application can continue execution. Also, the control is updated during the refresh so that the user can continue to interact with it.

The overhead of updating groups and summaries individually, rather than all at once, makes an asynchronous refresh take longer than a synchronous one. However, for large data sets, your application continues to operate during the refresh.

Parameters