AS3从事件侦听器函数返回变量 [英] AS3 Returning a variable from an event listener function

问题描述

我正试图将XML从事件完成返回到主函数，但无法弄清楚该怎么做.

I'm trying to return XML from an event complete back to the main function, but can't figure out how to do it.

这是我正在调用的函数:

Here's the functions I'm calling:

主文件:

public var mySendAndLoad:SendAndLoad = new SendAndLoad(); 

mySendAndLoad.sendData(url,variables)

mySendAndLoad类:

The mySendAndLoad class:

package 
{

    import flash.events.*;
    import flash.net.*;
    import flash.xml.XMLDocument;

    public class SendAndLoad
    {
        public var xml:XML = new XML();
        public var xmlList:XMLList;

        public function SendAndLoad()
        {
        }
        public function sendData(url:String, _vars:URLVariables):String
        {
            var request:URLRequest = new URLRequest(url);
            var loader:URLLoader = new URLLoader();
            loader.dataFormat = URLLoaderDataFormat.TEXT;
            request.data = _vars;
            request.method = URLRequestMethod.POST;
            loader.addEventListener(Event.COMPLETE, handleComplete);
            loader.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
            loader.load(request);
        }
        private function handleComplete(event:Event):String
        {
            var loader:URLLoader = URLLoader(event.target);
            xml = XML(loader.data);
            xmlList = xml.children();
            return(xmlList[1]);
        }
        private function onIOError(event:IOErrorEvent):void
        {
            trace("Error loading URL.");
        }
    }
}

我想要发生的是让xmlList返回主文件.但是由于不是在我打电话给(sendData)的情况下，它不会被带回来.

What I want to happen is have the xmlList come back to the main file. But since it isn't in the event I called (sendData) it doesn't get brought back.

有什么想法吗?

推荐答案

package 
{

import flash.events.*;
import flash.net.*;
import flash.xml.XMLDocument;

//THIS CLASS EXTENDS EVENTDISPATCHER SO IT CAN DISPATCH EVENTS
public class SendAndLoad extends EventDispatcher
{
    public var xml:XML = new XML();
    public var xmlList:XMLList;

    public function SendAndLoad()
    {
        super(null);
    }
    public function sendData(url:String, _vars:URLVariables):void
    {
        var request:URLRequest = new URLRequest(url);
        var loader:URLLoader = new URLLoader();
        loader.dataFormat = URLLoaderDataFormat.TEXT;
        request.data = _vars;
        request.method = URLRequestMethod.POST;
        loader.addEventListener(Event.COMPLETE, handleComplete);
        loader.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
        loader.load(request);
    }
    private function handleComplete(event:Event):void
    {
        var loader:URLLoader = URLLoader(event.target);
        xml = XML(loader.data);
        xmlList = xml.children();


        //NEW CODE
        var evt:Event=new Event(Event.COMPLETE);
        dispatchEvent(evt);
        //return(xmlList[1]);
    }
    private function onIOError(event:IOErrorEvent):void
    {
        trace("Error loading URL.");
    }
}

}

并在主文件中

public var mySendAndLoad:SendAndLoad = new SendAndLoad(); 
mySendAndLoad.addEventListener(Event.COMPLETE, xmlLoadCompleted);
mySendAndLoad.sendData(url,variables)

private function xmlLoadCompleted(e:Event):void {
    var childToUse:XML=mySendAndLoad.xmlList[1];
    //whatever else you want to do 
}

这篇关于AS3从事件侦听器函数返回变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！