flex后台交互

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>

       <![CDATA[

           private function initializeHandler(event:Event):void {

              countriesService.send();

           }

           private function changeHandler(event:Event):void {

              statesService.send();

           }

       ]]>

    </mx:Script>

    <!-- 载入纯静态的xml数据 -->

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

    <!-- 载入由php生成的xml数据 -->//随便什么语言都行JSP,ASP,.NET都可以

    <mx:HTTPService id="statesService" url="http://www.rightactionscript.com/states/xml/states.php">

       <!-- 以下标签就是要发送到服务端的数据了,可以这样理解:有一个名为country的变量,它的值为花括号{}里的内容 -->

       <mx:request>

           <country>{country.value}</country>

       </mx:request>

    </mx:HTTPService>

    <mx:VBox>

       <!-- 此控件的数据由第一个<mx:HTTPService/>控件接收的内容提供,并且由这个ComboBox控制着第二个ComboBox所要显示的内容 -->

       <mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}"

           change="changeHandler(event)" />

          

       <!-- 下面的ComboBox已经绑定了{statesService.lastResult.states.state},随它的数据改变而改变 -->

       <mx:ComboBox dataProvider="{statesService.lastResult.states.state}" />

    </mx:VBox>

</mx:Application>









URLLoader

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">

    <mx:Script>

       <![CDATA[

           private var _countriesService:URLLoader;

           private var _statesService:URLLoader;

           private function initializeHandler(event:Event):void {

              _countriesService = new URLLoader();

              _countriesService.addEventListener(Event.COMPLETE, countriesCompleteHandler);

              _countriesService.load(new URLRequest("http://www.rightactionscript.com/states/xml/countries.xml"));

             

              _statesService = new URLLoader();

              _statesService.addEventListener(Event.COMPLETE, statesCompleteHandler);

              XML.ignoreWhitespace = true;

           }

           private function countriesCompleteHandler(event:Event):void {

           var xml:XML = new XML(_countriesService.data);

           country.dataProvider = xml.children();

           }

           private function statesCompleteHandler(event:Event):void {

              var xml:XML = new XML(_statesService.data);

              state.dataProvider = xml.children();

           }

           private function changeHandler(event:Event):void {

              var request:URLRequest = new URLRequest("http://www.rightactionscript.com/states/xml/states.php");

              var parameters:URLVariables = new URLVariables();

              parameters.country = country.value;

              request.data = parameters;

              _statesService.load(request);

           }

       ]]>

    </mx:Script>

    <mx:VBox>

    <mx:ComboBox id="country" change="changeHandler(event)" />

    <mx:ComboBox id="state" />

    </mx:VBox>

</mx:Application>