[Flex] file uploading with return data Enjoy/FLEX2012. 3. 2. 10:33
The addition of the FileReference class in AS2 made file uploading significantly easier in Actionscript. However, one issue that remained problematic was the ability to get detailed information back from the server once the upload was complete. The best you could do was to get a ’200′ response saying the file upload had completed, but there was no easy way to return additional data from the server with respect to the uploaded process …. until now.
Adobe has finally added the missing piece to accomplish a nice tight uploading process, theUPLOAD_COMPLETE_DATA event (Flash Player 9.0.28.0). This event fires after the COMPLETE event and contains an important piece of information. The data property of the DataEvent contains the raw data returned from the server after a successful file upload. Finally, a way to return from the server information about the file and/or process. This is especially useful if during the upload process you need to do additional things like create a database record and then return the new database id, or possibly put the file in a different path based on the user, and return the path where the file exists back to the client.
Here’s a quick sample of implementing the new event in Flex and also a Coldfusion and PHP script to upload a file and then output and return data back to the client in a clean consistent fashion.
The Flex code. As you can see, this is a very simple example, you select a file and when the upload has completed the results from the server are output into a text area.
<?xml version="1.0" encoding="utf-8"?>
<!--
Derrick Grigg
derrick@dgrigg.com
http://www.dgrigg.com
created on August 2, 2007
A simple file upload process with data returned from the server
using the UPLOAD_COMPLETE_DATA event.
-->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
public var file:FileReference;
public function selectFile():void
{
file = new FileReference();
file.addEventListener(Event.SELECT, fileSelected);
file.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA, uploadDataComplete);
file.addEventListener(Event.COMPLETE, uploadComplete);
file.addEventListener(IOErrorEvent.IO_ERROR, handleError);
file.browse();
}
public function handleError(event:IOErrorEvent):void
{
status_txt.text = 'ERROR: ' + event.text + ' ';
}
public function fileSelected(event:Event):void
{
file = FileReference(event.target);
file_txt.text = file.name;
status_txt.text = 'upload file: '+ file.name + ' ';
var request:URLRequest = new URLRequest();
request.url = "uploader.cfm";
file.upload(request);
}
public function uploadDataComplete(event:DataEvent):void
{
var result:XML = new XML(event.data);
status_txt.text += 'Upload Data Complete '
status_txt.text += 'RESULT: ' + result.toString() + ' '
status_txt.text += 'STATUS: ' + result.status + ' ';
status_txt.text += 'MESSAGE: '+ result.message;
}
public function uploadComplete(event:Event):void
{
status_txt.text += 'Upload complete ';
}
]]>
</mx:Script>
<mx:VBox>
<mx:TextInput id="file_txt"/>
<mx:Button id="select_btn" label="select" click="selectFile();"/>
<mx:TextArea id="status_txt" width="400" height="200"/>
</mx:VBox>
</mx:Application>
The Coldfusion and PHP scripts upload a file and then output a simple XML string stating if the upload worked. You could easily modify this to return back any additional data you needed. The scripts are very simplified for demonstration purposes, you would definitely want to make them more robust in a production environment.
The Coldfusion upload script.
<cfprocessingdirective suppresswhitespace="true">
<cftry>
<cffile action="upload" fileField="filedata" destination="c:wampwww estflex" nameconflict="overwrite">
<cfxml variable="status"><result><status>OK</status><message><cfoutput>#filename#</cfoutput> uploaded successfully.</message></result></cfxml>
<cfcatch>
<cfxml variable="status"><result><status>Error</status><message><cfoutput>#cfcatch.Message#</cfoutput></message></result></cfxml>
</cfcatch>
</cftry>
<cfoutput>#status#</cfoutput>
</cfprocessingdirective>
The PHP upload script
<?php
$upload_dir = $_SERVER['DOCUMENT_ROOT'] . dirname($_SERVER['PHP_SELF']) . '/';
$upload_url = "http://".$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']) . '/';
$message ="";
$temp_name = $_FILES['Filedata']['tmp_name'];
$file_name = $_FILES['Filedata']['name'];
$file_name = str_replace("","",$file_name);
$file_name = str_replace("'","",$file_name);
$file_path = $upload_dir.$file_name;
$result = move_uploaded_file($temp_name, $file_path);
if ($result)
{
$message = "<result><status>OK</status><message>$file_name uploaded successfully.</message></result>";
}
else
{
$message = "<result><status>Error</status><message>Somthing is wrong with uploading a file.</message></result>";
}
echo $message;
?>
You can download the sample files here.
I’m glad to see Adobe finally added this, it makes life so much easier.
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