Mozilla XML - Search elements with XPath

Author

Search elements with XPath

Eugene Prokopiev

2005-08-10, 8:54 pm

Hi,

I have this people.xml:

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions
targetNamespace="http://localhost:8080/wsapp/services/PeopleService"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
<wsdl:portType name="PeopleService">
<wsdl:operation name="add" parameterOrder="name sex age"/>
<wsdl:operation name="getList"/>
<wsdl:operation name="del" parameterOrder="id"/>
</wsdl:portType>
</wsdl:definitions>

How can I find all wsdl:operation which are childs of wsdl:portType
name="PeopleService"?

I wrote:

var doc = document.implementation.createDocument("","",null);
doc.async = false;
doc.load("people.xml");
var services =
doc.evaluate("/definitions/portType@name='PeopleService'/operations",
doc, "http://schemas.xmlsoap.org/wsdl/", XPathResult.ANY_TYPE, null);
while (services.iterateNext()) {
alert(operation[i].getAttribute("name"));
alert(operation[i].getAttribute("parameterOrder"));
}

But I got:

Error: uncaught exception: [Exception... "Could not convert JavaScript
argument arg 2 [nsIDOMXPathEvaluator.evaluate]" nsresult: "0x80570009
(NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame ::
file:///home/john/devel/xul/wsdl/wsdl.js :: analize :: line 4" data: no]

What's wrong?

--
Thanks,
Eugene Prokopiev

Eugene Prokopiev

2005-08-11, 7:23 am

Another code:

var doc = document.implementation.createDocument("","",null);
doc.async = false;
doc.load("people.xml");
var methods = doc.evaluate(
"/wsdl:definitions/wsdl:portType[@name='PeopleService']/wsdl:operation",
doc,
doc.createNSResolver(doc.documentElement),
XPathResult.ORDERED_NODE_ITERATOR_TYPE,
null
);
while (methods.iterateNext()) {
alert(methods.singleNodeValue);
}

On line with alert:

Error: uncaught exception: [Exception... "The expression cannot be
converted to return the specified type." code: "52" nsresult:
"0x805b0034 (NS_ERROR_DOM_TYPE_ERR)" location:
"file:///home/john/devel/xul/wsdl/wsdl.js Line: 13"]

What's wrong now?

--
Thanks,
Eugene Prokopiev

Axel Hecht

2005-08-11, 7:23 am

Eugene Prokopiev wrote:
> Another code:
>
> var doc = document.implementation.createDocument("","",null);
> doc.async = false;
> doc.load("people.xml");
> var methods = doc.evaluate(
> "/wsdl:definitions/wsdl:portType[@name='PeopleService']/wsdl:operation",
> doc,
> doc.createNSResolver(doc.documentElement),
> XPathResult.ORDERED_NODE_ITERATOR_TYPE,
> null
> );
> while (methods.iterateNext()) {
> alert(methods.singleNodeValue);
> }
>

singleNodeValue is only for UNORDERED_NODE_SNAPSHOT_TYPE or
ORDERED_NODE_SNAPSHOT_TYPE, you want to do

var node;
while ((node = methods.iterateNext())) {
alert(node);
}

Axel

Peter Van der Beken

2005-08-12, 7:51 pm

Eugene Prokopiev wrote:
> doc.evaluate("/definitions/portType@name='PeopleService'/operations",
> doc, "http://schemas.xmlsoap.org/wsdl/", XPathResult.ANY_TYPE, null);

> But I got:
>
> Error: uncaught exception: [Exception... "Could not convert JavaScript
> argument arg 2 [nsIDOMXPathEvaluator.evaluate]" nsresult: "0x80570009
> (NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame ::
> file:///home/john/devel/xul/wsdl/wsdl.js :: analize :: line 4" data: no]

Maybe you should parse the error and read the spec: arg 2 in evaluate is
of type XPathNSResolver, which is either an object (which you could
create with createNSResolver) or a function mapping prefixes to uris,
not a string.
And XPath doesn't have the concept of a default namespace, which you
seem to be relying on here.

Peter