Adobe® Flex® 4 Language Reference
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mx.collections 
SummaryField2 
Packagemx.collections
Classpublic class SummaryField2
InheritanceSummaryField2 Inheritance Object

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The SummaryField2 class represents a single property in a SummaryRow instance. Each SummaryRow instance specifies one or more SummayField2 instances that are used to create a data summary.

Note: In the previous release of Flex, you used the SummaryField class to create summary data. The SummaryField2 class is new for Flex 4 and provides better performance than SummaryField.

Use the dataField property to specify the data field used to generate the summary, the label property to specify the name of the data field created to hold the summary data, and the summaryOperation property to specify how to create the summary for numeric fields. You can specify one of the following values: SUM, MIN, MAX, AVG, or COUNT.

Or you can specify an ISummaryCalculator implementation to calculate the summaries.

The following example creates summary rows based on two fields of the data provider of the AdvancedDataGrid control:

  <mx:AdvancedDataGrid id="myADG" 
    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:SummaryField2 dataField="Actual" 
                    label="Min Actual" summaryOperation="MIN"/>
                  <mx:SummaryField2 dataField="Actual" 
                    label="Max Actual" summaryOperation="MAX"/>
                </mx:fields>
              </mx:SummaryRow>
            </mx:summaries>
          </mx:GroupingField>
          <mx:GroupingField name="Territory">
            <mx:summaries>
              <mx:SummaryRow summaryPlacement="group">
                <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: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>
  

MXML SyntaxexpandedHide MXML Syntax
The <mx.SummaryField2> inherits all the tag attributes of its superclass, and defines the following tag attributes:

  <mx:SummaryField2
  Properties 
    dataField="No default"
    label="No default"
    summaryOperation="SUM"
  />
  

See also



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  dataField : String
Data field for which the summary is computed.
SummaryField2
  label : String
The property used inside the summary object, an instance of the SummaryObject class, to hold summary information.
SummaryField2
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
  summaryOperation : Object = SUM
The summary performed on the children.
SummaryField2
Public Methods
 MethodDefined By
  
SummaryField2(dataField:String = null, summaryOperation:Object = SUM)
Constructor.
SummaryField2
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Property Detail

dataField

property
public var dataField:String

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Data field for which the summary is computed.

label

property 
public var label:String

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The property used inside the summary object, an instance of the SummaryObject class, to hold summary information.

For example, if you set the label property to "Summary", then the computed summary is placed in a property named "Summary" in the summary object. The property of the SummaryObject instance containing the summary data will appear as below:

{Summary:1000}

See also

summaryOperation

property 
public var summaryOperation:Object = SUM

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The summary performed on the children. The value of this property can be one of the following:

  • For numeric fields: SUM, MIN, MAX, AVG, or COUNT.
  • An instance of a class that implements the custom ISummaryCalculator interface to calculate a custom summary.

The default value is SUM.

See also

Constructor Detail

SummaryField2

()Constructor
public function SummaryField2(dataField:String = null, summaryOperation:Object = SUM)

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Constructor.

Parameters
dataField:String (default = null) — Data field for which the summary is computed.
 
summaryOperation:Object (default = SUM) — The function that should be performed on the children. You can specify one of the following values for numeric fields: SUM, MIN, MAX, AVG, or COUNT. Or you can specify an ISummaryCalculator implementation to calculate the summaries.