Flex上傳本地圖片并提前瀏覽的實現(xiàn)方法

?xml version="1.0" encoding="utf-8"?>
s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
creationComplete="creationCompleteHandler(event)">
fx:Script>
![CDATA[
import flash.net.FileReference;
import flash.net.FileFilter;
import flash.events.IOErrorEvent;
import flash.events.Event;

private var fr:FileReference;
private var imageTypes:FileFilter;

private function creationCompleteHandler(event:Event):void {
fr = new FileReference();
imageTypes = new FileFilter("Images (*.jpg, *.jpeg, *.png, *.gif)","*.jpg; *.jpeg; *.png; *.gif;")
fr.addEventListener(Event.SELECT, selectHandler);//增加當打開瀏覽文件后，用戶選擇好文件后的Listener
}

private function browseHandler(event:Event):void {
fr.browse([imageTypes]);//打開瀏覽文件的dialog
}

private function selectHandler(event:Event):void {
fr.addEventListener(Event.COMPLETE, onLoadComplete);//增加一個文件加載load完成后的listener
fr.load(); //加載用戶選中文件
}

private function onLoadComplete(e:Event):void
{
imgPhoto.source = fr.data;
}

]]>
/fx:Script>
s:layout>
s:BasicLayout/>
/s:layout>
fx:Declarations>
!-- 將非可視元素（例如服務、值對象）放在此處 -->
/fx:Declarations>
mx:Image id="imgPhoto" visible="true" autoLoad="true" width="1000" height="500"/>
mx:Button id="btnBrowse" label="Browse" click="browseHandler(event)" />
/s:Application>