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>