Pour faire des appels JS->Flex ou Flex-JS on utilise ExternalInterface

exemple d’allers-retours JS->Flex->JS

<SCRIPT LANGUAGE="JavaScript">
function fromFlexToJavascript(obj)    {
    alert("id = "+obj.id+" username="+obj.username);
    return "Bonjour, votre nom est "+obj.username;
}
function fromJavascriptToFlex(numero){
    alert(numero);
    var retour = document.getElementById("js").fromJavascriptToFlex(numero);
    alert("Double:" + retour);
}
</SCRIPT>

et la partie Flex associée:

// ActionScript file
import flash.external.ExternalInterface;
import mx.controls.Alert;

public function init():void {
    ExternalInterface.addCallback("fromJavascriptToFlex",fromJavascriptToFlex);
}
public function fromJavascriptToFlex(numero:int):Number {
    return numero*2;
}

public function callJS():void {
    var s:String;
    var obj:Object = new Object();
    obj.id = 1;
    obj.username = "yarek";
    s = ExternalInterface.call("fromFlexToJavascript", obj);
    Alert.show("s="+s);
}