GroupingField  - AS3 Flex

Set to true if the sort for this field should be case-insensitive.

預設值為 false。

The function that compares two items during a sort of items for the associated collection. If you specify a compareFunction property in a Grouping object, Flex ignores any compareFunction properties of the GroupingField objects.

The compare function must have the following signature:

function myCompare(a:Object, b:Object):int

This function must return the following values:

• -1, if a should appear before b in the sorted sequence.
• 0, if a equals b.
• 1, if a should appear after b in the sorted sequence.

The default value is an internal compare function that can perform a string, numeric, or date comparison in ascending or descending order, with case-sensitive or case-insensitive string comparisons. Specify your own function only if you need a custom comparison algorithm. This is normally only the case if a calculated field is used in a display.

Set to true if the sort for this field should be in descending order.

預設值為 false。

A function that determines the label for this group. By default, the group displays the text for the field in the data that matches the filed specified by the name property. However, sometimes you want to group the items based on more than one field in the data, or group based on something that is not a simple String field. In such a case, you specify a callback function by using the groupingFunction property.

A callback function might convert a number for the month into the String for the month, or group multiple items into a single group based on some criteria other than the actual value of the field.

For the GroupField, the method signature has the following form:

groupingFunction(item:Object, field:GroupField):String

Where item contains the data item object, and field contains the GroupField object.

      private function groupFunc(item:Object, field:GroupingField):String
      {
          return item[field.name].toString().substr(0, 1);
      }
      

A callback function to run on each group node to determine the grouping object. By default, a new Object will be created for group nodes.

You can supply a groupingObjectFunction that provides the appropriate Object for group nodes.

The method signature is:

      myGroupObjectFunction(label:String):Object

Where label contains the value that will be shown for that group node. The function returns an Object that will be used for group nodes.

      private function groupObjFunction(label:String):Object
      {
          var obj:Object = {};
          obj.name = "Bob";
     
          return obj;
      }
      

The name of the field to be sorted.

預設值為 null。

Specifies that if the field being sorted contains numeric (Number/int/uint) values, or String representations of numeric values, the comparitor uses a numeric comparison. If this property is false, fields with String representations of numbers are sorted using String comparison, so 100 precedes 99, because "1" is a lower string value than "9".

預設值為 false。

Array of SummaryRow instances that define the group-level 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:GroupingCollection id="gc" source="{dpFlat}">
                 <mx:Grouping>
                     <mx:GroupingField name="Region">
                       <mx:summaries>
                           <mx:SummaryRow summaryPlacement="group">
                             <mx:fields>
                                 <mx:SummaryField dataField="Actual" 
                                     label="Min Actual" operation="MIN"/>
                                 <mx:SummaryField dataField="Actual" 
                                     label="Max Actual" operation="MAX"/>
                             </mx:fields>
                           </mx:SummaryRow>
                         </mx:summaries>
                     </mx:GroupingField>
                 </mx:Grouping>
             </mx:GroupingCollection>
         </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>  
      

相關 API 元素

Constructor.