Flex中如何利用HTTPService的send()，将参数传递给HTTPService

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.events.ValidationResultEvent;
            import mx.utils.StringUtil;

            private function submit_click(evt:MouseEvent):void {
                var result:ValidationResultEvent = stringValidator.validate();
                var params:Object = {};

                lbl.text = "";

                switch (result.type) {
                    case ValidationResultEvent.INVALID:
                        Alert.show(result.message,result.type);
                        break;
                    case ValidationResultEvent.VALID:
                        params["name"] = StringUtil.trim(firstName.text);
                        httpServ.send(params);
                        break;
                }
            }
        ]]>
    </mx:Script>

    <mx:StringValidator id="stringValidator"
            source="{firstName}"
            property="text"
            minLength="2"
            maxLength="{firstName.maxChars}" />

    <mx:HTTPService id="httpServ">
        <mx:resultFormat>flashvars</mx:resultFormat>
        <mx:url>http://www.flash-mx.com/mm/greeting.cfm</mx:url>
        <mx:result>lbl.text = httpServ.lastResult.welcomeMessage;</mx:result>
        <mx:fault>Alert.show(event.toString(),event.type);</mx:fault>
    </mx:HTTPService>

    <mx:ApplicationControlBar dock="true">
        <mx:Form>
            <mx:FormItem label="Name:" required="true"
                    direction="horizontal">
                <mx:TextInput id="firstName"
                    maxChars="20" />
                <mx:Button label="Submit"
                        click="submit_click(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:Label id="lbl" fontSize="32" />

</mx:Application>

?

?文章转自 http://blog.minidx.com/2008/10/31/1596.html