How to access xml nodes in flex
The web service returns this normal exception to my flex3 client:
<SOAP-ENV:Fault xmlns:ro="urn:Gov2gLibrary" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:HNS="http://tempuri.org/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:v1="http://tempuri.org/">
<faultcode>E2gError</faultcode>
<faultstring>abc</faultstring>
<detail>
<HNS:ROException>
<HNS:Messages>
<HNS:T2gMsg>
<HNS:ID>4545</HNS:ID>
<HNS:Severity>abc</HNS:Severity>
<HNS:Category>abc</HNS:Category>
<HNS:Message1>abc</HNS:Message1>
<HNS:Message2 />
</HNS:T2gMsg>
<HNS:T2gMsg>
<HNS:ID>345344</HNS:ID>
<HNS:Severity>abc</HNS:Severity>
<HNS:Category>abc</HNS:Category>
<HNS:Message1>abc</HNS:Message1>
<HNS:Message2 />
</HNS:T2gMsg>
</HNS:Messages>
</HNS:ROException>
</detail>
</SOAP-ENV:Fault>
This is obviously part of the FaultEvent object that I get when the remote call fails, so I am trying to access the values of the subnode "T2gMsg" like this:
protected function onFaultEvent(e:FaultEvent):void
{
var obj:Object = e.fault;
var err:XMLList = obj.element.detail.children()[0].children();
// now I have in err the "Messages" list, subnode of ROException,
// so I should cycle to read one message at time:
for each (var x:XML in err.children())
{
//?
}
Now I cannot figure out how to read the values of ID, Severity, etc. I think that something like "x.ID" should work, but it doesn't, while x.child ("ID") or x.elements ("ID") return null. What can I do?
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(as suggested, I go here to the solution I founded to close the question)
it is a question of namespaces: livedocs to explain that we need to qualify nodes to access them:
var obj:Object = e.fault;
var doc:XML = obj.element.detail[0];
var err:XMLList = doc.children()[0].children(); // messages
var ns:Namespace = doc.namespace("HNS");
for each (var x:XML in err.children())
{
trace(x.ns::ID);
trace(x.ns::Severity);
trace(x.ns::Category);
trace(x.ns::Message1);
trace(x.ns::Message2);
}
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thank. along with the online document and this discussion, I understand how to access the xml nodes of the namespace.
I think if the prefix is not used as an example xml, you need to assign a namespace to the uri used.
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<FindJunctionResponse xmlns="http://someserver/Service/NamePath">
<FindJunctionResult>
<OID>558</OID>
<ClassID>5</ClassID>
<Position>0</Position>
<EID>0</EID>
<XCoord>1662634.10015</XCoord>
<YCoord>71634.435475</YCoord>
<IsJunction>true</IsJunction>
<IsFlag>false</IsFlag>
</FindJunctionResult>
</FindJunctionResponse>
</soap:Body>
</soap:Envelope
So, while this is a bit longer, the "syntax" for accessing xml nodes is:
<xml message>.<namespace class>::<xml node>.<name space class>
....
private function webServiceHandleResult(event:ResultEvent):void
{
XML.ignoreWhitespace;
var eXml:XML = new XML(event.message.body);
var eXmlList:XMLList = eXml.children();
var soapNS:Namespace = eXml.namespace("soap");
var xmlnsNS:Namespace = new Namespace("http://someserver/Service/NamePath/")
var resulteXmlList:XMLList = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult;
for each (var myxml:XML in resulteXmlList.children())
{
//for each field, you can get the name and the value
trace("field: " + myxml.localName() + ": " + myxml.valueOf());
}
//or reference each xml node by name.
trace("OID: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::OID);
trace("ClassID: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::ClassID);
trace("Position: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::Position);
trace("EID: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::EID);
trace("XCoord: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::XCoord);
trace("YCoord: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::YCoord);
trace("IsJunction: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::IsJunction);
trace("IsFlag: " = eXml.soapNS::Body.xmlnsNS::FindJunctionResponse.xmlnsNS::FindJunctionResult.xmlnsNS::IsFlag);
}
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