A custom function to convert new data items to the format required by the data provider
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<!-- dpcontrols\spark\SparkCBAddItemObj.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:VerticalLayout paddingTop="5" paddingLeft="5" />
</s:layout>
<fx:Script>
import spark.events.IndexChangeEvent;
// Define a custom function for the labelFunction property
// to display an Object in the ComboBox control.
public function myLabelFunc(item:Object):String {
return item.firstName + " " + item.lastName;
}
// Define a custom function for the labelToItemFunction property
// to convert the new value to an Object of the correct format
// for storage in the data provider of the control.
public function myLabelToItemFunc(value:String):Object {
var tempObj:Object = new Object();
var spaceChar:int = value.indexOf(' ');
tempObj.firstName = value.substr(0, spaceChar);
tempObj.lastName = value.substr(spaceChar+1, value.length);
return tempObj;
}
// Event handler to determine if the selected item is new.
protected function myCB_changeHandler(event:IndexChangeEvent):void
{
// Determine if the index specifies a new data item.
if(myCB.selectedIndex == spark.components.ComboBox.CUSTOM_SELECTED_ITEM)
// Add the new item to the data provider.
myCB.dataProvider.addItem(myCB.selectedItem);
}
</fx:Script>
<s:Label text="The selected index is: {myCB.selectedIndex}" />
<s:Label text="The selected item is: {myCB.selectedItem.firstName + ' ' + myCB.selectedItem.lastName}" />
<s:ComboBox id="myCB" width="140" labelFunction="myLabelFunc"
labelToItemFunction="myLabelToItemFunc"
change="myCB_changeHandler(event);">
<s:dataProvider>
<mx:ArrayList>
<fx:Object firstName="Steve" lastName="Smith" />
<fx:Object firstName="John" lastName="Jones" />
<fx:Object firstName="Mary" lastName="Moore" />
</mx:ArrayList>
</s:dataProvider>
</s:ComboBox>
</s:Application>
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