[twitter]here i want to show some tutorials, screen casts or video stuff..
How to send or receive data JSON encoded data from flash to a server-side-script
As contributor in some flash-related forums i noticed, that a lot of people are asking the same question over and over again.
How to send or receive JSON-encoded data from flash to a server-side-script
In this little “tutorial” we’ll send an arbitrary JSON-encoded Object from flash to our server-script, alter the value of its property and send it; even JSON encoded; back from the server to flash.
First we need to know how the object looks like:
var person: Object = new Object(); person.age = 17; // this is the property we want to change
Now let’s do the server-side script which receives and sends our JSON endcoded data.
Here is a little example:
<?php // // only continue if data is sent in the 'data' property // if (!empty($_REQUEST['data'])) { // // retrieve the sent data // $data = urldecode(utf8_decode(stripslashes($_REQUEST['data']))); // // re-create the sent object <code>person</code> // $decoded_person = json_decode( $data ); // // the ravages of time // happy_birthday( $decoded_person ); // // prepare the data for sending back to flash // $encoded_person = json_encode( $decoded_person ); // // send // print($encoded_person); } // // increase the <code>age</code> property // of <code>person</code> and return the object // function happy_birthday ( $person ) { (int) $person->age++; return $person; } ?>
import com.adobe.serialization.json.JSON; // // URLLoader event-handler // function completeHandler (e:Event):void { trace('::complete()'); trace('--received: '+ e.target.data); } function ioHandler (evt:IOErrorEvent): void { trace("::IOError()n"+ evt.text ); } function securityHandler (evt:SecurityErrorEvent): void { trace("::SecurityError()n"+ evt.text ); } // // setup the data we want to send // var person: Object = new Object(); person.age = 17; var encoded_person: String = JSON.encode(person); trace('--sending: '+ encoded_person); // {"age":17} // // encode and store the data // var vars: URLVariables = new URLVariables(); vars.data = JSON.encode(person); var request: URLRequest = new URLRequest(); request.url = "http://localhost/data.php"; request.data = vars; request.method = URLRequestMethod.POST; // // add event listener and sent the encoded data // var loader: URLLoader = new URLLoader(); loader.addEventListener(Event.COMPLETE, completeHandler); loader.addEventListener(IOErrorEvent.IO_ERROR, ioHandler); loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityHandler); loader.load(request);
If all’s gone well you should see the following output..
--sending: {"age":17} ::complete() --received: {"age":18}
Et voila..
Now you just need to decode the data in the completeHandler like so, and you’ll have your object with the changed value.
function completeHandler (e:Event):void { trace('::complete()'); trace('--received: '+ e.target.data); try { var person: Object = JSON.decode(e.target.data); trace('--age is now: '+ person.age); // 18 } catch (e:Error) { trace('ERROR - could not decode data..'); } }
and thats it..
If you find this useful feel free to share or leave a comment if you like.
Thanks for reading..
~ David
Download: as3.json.encoding.zip