Pass parameter to HTTPService

      

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">

    <mx:Script>
        

            private function initializeHandler(event:Event):void {
                countriesService.send(  );
            }

            private function changeHandler(event:Event):void {
                statesService.send(  );
            }

      
    </mx:Script>

    <mx:HTTPService id="countriesService" url="http://server.com/countries.xml" />

    <mx:HTTPService id="statesService" url="http://server.com/state.php">
        <mx:request>
            <country>
                {country.value}
            </country>
        </mx:request>
    </mx:HTTPService>

    <mx:VBox>
        <mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}" change="changeHandler(event)" />
        <mx:ComboBox dataProvider="{statesService.lastResult.states.state}" />
    </mx:VBox>

</mx:Application>

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Pass parameter to HTTPService : HTTPService « Data Model « Flex

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