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Rank: Newbie
Joined: 3/29/2008
Posts: 24
Location: NC
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I have a little bit of sample code: Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:Stylesheet [ <!ENTITY nbsp " "> ]>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxml="urn:schemas-microsoft-com:xslt"
xmlns:umbraco.library="urn:umbraco.library"
xmlns:mine="urn:mine"
exclude-result-prefixes="msxml umbraco.library mine">
<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:param name="currentPage"/>
<xsl:variable name="messages" select="mine:UnreadMessages()" />
<xsl:template match="/">
<xsl:for-each select="$messages/node">
HERE
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
mine:UnreadMessages() returns a string of XML data, but when I try to iterate through the xml data, I am receiving and error on save: Code:
Hide ErrorsError occured
System.Xml.XPath.XPathException: Expression must evaluate to a node-set.
at MS.Internal.Xml.XPath.ExtensionQuery.Advance()
at MS.Internal.Xml.XPath.ChildrenQuery.Advance()
at MS.Internal.Xml.XPath.XPathSelectionIterator.MoveNext()
at System.Xml.Xsl.XsltOld.ActionFrame.NewNextNode(Processor proc)
at System.Xml.Xsl.XsltOld.ForEachAction.Execute(Processor processor, ActionFrame frame)
at System.Xml.Xsl.XsltOld.ActionFrame.Execute(Processor processor)
at System.Xml.Xsl.XsltOld.Processor.Execute()
at System.Xml.Xsl.XsltOld.Processor.Execute(TextWriter writer)
at System.Xml.Xsl.XslTransform.Transform(XPathNavigator input, XsltArgumentList args, TextWriter output, XmlResolver resolver)
at System.Xml.Xsl.XslTransform.Transform(IXPathNavigable input, XsltArgumentList args, TextWriter output, XmlResolver resolver)
at umbraco.presentation.webservices.codeEditorSave.SaveXslt(String fileName, String fileContents, Boolean ignoreDebugging)
I have dug through the forums and have found others with this problem, but haven't been able to find a workable solution. Can anyone explain how to iterate through XML returned from an xslt extension? BTW - the copy of an <xsl:copy-of> is this: Code:
<NewDataSet>
<Messages>
<CreatedOn>2008-12-12T02:23:13.9830731-05:00</CreatedOn>
<Message>This is a test.</Message>
</Messages>
</NewDataSet>
Thanks for the help as always. Hal
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Rank: Newbie
Joined: 3/29/2008
Posts: 24
Location: NC
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One additional note: I have tried doing the following as well: Code:
<xsl:variable name="messages" select="msxml:node-set(meta:UnreadMessages())" />
But receive an error like the following: Code:
System.Xml.XPath.XPathException: Function 'msxml:node-set()' has failed. ---> System.Xml.Xsl.XsltException: Cannot convert the operand to 'Result tree fragment'.
at System.Xml.Xsl.XsltOld.XsltCompileContext.XsltFunctionImpl.ToNavigator(Object argument)
at System.Xml.Xsl.XsltOld.XsltCompileContext.FuncNodeSet.Invoke(XsltContext xsltContext, Object[] args, XPathNavigator docContext)
at MS.Internal.Xml.XPath.FunctionQuery.Evaluate(XPathNodeIterator nodeIterator)
--- End of inner exception stack trace ---
at MS.Internal.Xml.XPath.FunctionQuery.Evaluate(XPathNodeIterator nodeIterator)
at System.Xml.Xsl.XsltOld.Processor.RunQuery(ActionFrame context, Int32 key)
at System.Xml.Xsl.XsltOld.VariableAction.Execute(Processor processor, ActionFrame frame)
at System.Xml.Xsl.XsltOld.ActionFrame.Execute(Processor processor)
at System.Xml.Xsl.XsltOld.Processor.Execute()
at System.Xml.Xsl.XsltOld.Processor.Execute(TextWriter writer)
at System.Xml.Xsl.XslTransform.Transform(XPathNavigator input, XsltArgumentList args, TextWriter output, XmlResolver resolver)
at System.Xml.Xsl.XslTransform.Transform(IXPathNavigable input, XsltArgumentList args, TextWriter output, XmlResolver resolver)
at umbraco.presentation.webservices.codeEditorSave.SaveXslt(String fileName, String fileContents, Boolean ignoreDebugging)
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Rank: Addict
Joined: 7/20/2006
Posts: 842
Location: NL
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Hal, the result-set, does it have brackets or does it contain lt's and gt's? (From what I see in your copy-of) If the latter, than that is the problem. Make your dll to spit out brackets. HTH, PeterD
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Rank: Newbie
Joined: 3/29/2008
Posts: 24
Location: NC
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PeterD wrote:does it have brackets or does it contain lt's and gt's? (From what I see in your copy-of) If the latter, than that is the problem. Make your dll to spit out brackets.
My copy-of does send the content to the browser with gt, lt, but in my extensions method I am simply doing a DataSet.GetXml(). I've tried, in turn, wrapping the DataSet.GetXml with an HttpUtility.HtmlDecode(input), but seem to get the same results on output. I'll dig a little deeper here - that maybe my problem. Thanks for the help. Hal
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Rank: Addict
Joined: 7/20/2006
Posts: 842
Location: NL
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Try sending it to screen with value-of with disible output-escaping and see if it sends the correct format. Might shed some more light
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Rank: Newbie
Joined: 3/29/2008
Posts: 24
Location: NC
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Thank you, thank you, thank you. Looks like I need to return a result set as an System.Xml.XPath.XPathNodeIterator instead of a string. After updating: Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:Stylesheet [ <!ENTITY nbsp " "> ]>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxml="urn:schemas-microsoft-com:xslt"
xmlns:umbraco.library="urn:umbraco.library"
xmlns:meta="urn:meta"
exclude-result-prefixes="msxml umbraco.library meta">
<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:variable name="messages" select="meta:UnreadMessages()" />
<xsl:param name="currentPage"/>
<xsl:template match="/">
<xsl:for-each select="$messages/NewDataSet/Messages">
<xsl:copy-of select="$messages" />
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
... works completely as expected. Best regards, Hal
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Rank: Newbie
Joined: 3/29/2008
Posts: 24
Location: NC
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Just a quick note on the above. I found the solution to returning a result set as an XPathNodeIterator here: http://blockquote.be/examples/umbraco-xslt-lib-astuanax.txt
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