 | | | LoadVars returning XML doc & EventDispatcher | LoadVars returning XML doc & EventDispatcher 2004-02-25 - By Pat Ryan
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Hi Everyone,
I have a couple of questions.
I have an existing Struts web application, that I am retrofitting a Flash
interface to. I have the need to post form data to Struts like URLs. The
returned data is an XML document, so its a hybrid between what LoadVars does and
what XML object does.
Is there an 'out of the box' way to post data to the servlet and receive an XML
doc back?
Going under the assumption there is not, I have written something that works -
except for the very final step of notifying the caller that the XML document is
ready.
The problem appears to be with the way I have EventDispatcher setup. My
listener is never getting called. Here is the code for the class that handles
the posting of form data, and the creation of an XML document from the servlet:
============================ POST4XML.as =============
import mx.events.EventDispatcher;
class Post4XML {
private var _receiveLoadVars:LoadVars;
private var _sendLoadVars:LoadVars;
private var _url:String;
private var _xml:XML;
public var addEventListener:Function;
public var removeEventListener:Function;
private var dispatchEvent:Function;
private function receiveOnData(data:String):Void {
trace("receiveOnData: " + data );
_xml = new XML();
_xml.ignoreWhite = true;
_xml.parseXML(data);
trace("_xml.firstChild: " + _xml.firstChild );
var eventObj:Object = {target:this, type:"xmlDocReady"};
eventObj.xmlDoc = _xml ;
dispatchEvent(eventObj);
}
public function Post4XML() {
trace("Post4XML ctor...");
mx.events.EventDispatcher.initialize(this);
init();
}
public function addParam(name:String, value:String):Void {
_sendLoadVars[name] = value;
}
public function setURL(url:String):Void {
_url = url;
}
public function init():Void {
_receiveLoadVars = new LoadVars();
_sendLoadVars = new LoadVars();
_url = "";
}
public function post():Void {
_receiveLoadVars.onData = receiveOnData;
_sendLoadVars.sendAndLoad(_url, _receiveLoadVars, "POST");
}
}
===========================================
Trace output:
Post4XML ctor...
Login button clicked:
receiveOnData: <?xml version="1.0" encodeing="iso-8859-1" ?>
<login results="true" />
_xml.firstChild: <login results="true" />
============================================
This is being setup in a Form class like:
class forms.LoginForm extends Form {
... detail deleted....
private function click():Void {
trace("Login Button clicked: " );
_post4XML.init();
_post4XML.addParam("username", userNameText.text);
_post4XML.addParam("password", passwordText.text);
_post4XML.addParam("validate_login", "true");
_post4XML.setURL("http://localhost:8080/myapp/ValidateLogin.do");
_post4XML.addEventListener("xmlDocReady", this);
_post4XML.post();
}
public function xmlDocReady(eventObj:Object):Void {
trace("xmlDocReady: " + eventObj.xmlDoc );
}
}
I expected to see xmlDocReady in the trace output but I never do. Can anyone
see a problem with this approach or can you suggest another approach to take to
solve this problem.
Thanks in advance.
Pat
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