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Error Testing if XML Element Exists (with isXmlElem)

Posted on 2009-05-08
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Last Modified: 2013-11-18

I'm parsing an XML API ... and all works great ... except on the rare occasion a specific 'branch' (for lack of correct XML terminology) fails to exist ... in which case I get this error:

Element NEWSNEWSCOLLECTIONS.NEWSNEWSCOLLECTION.NEWSNEWSARTICLES.NEWSNEWSARTICLE is undefined in a Java object of type class coldfusion.xml.XmlNodeMap referenced as ''

I'd like to TEST if element this element exists:
<cfset collections=IsXmlElem(live_doc.SearchResponse.newsNews.newsResults.newsNewsResult[i].newsNewsCollections.newsNewsCollection.newsNewsArticles.newsNewsArticle)>

AND if 'collections' is TRUE ... then I can get its arraylen and do fun stuff ... else move on.

arraylen(live_doc.SearchResponse.newsNews.newsResults.newsNewsResult[i].newsNewsCollections.newsNewsCollection.newsNewsArticles.newsNewsArticle)


ALAS ... the test - isXmlElem reports TRUE ... when TRUE - which is great!~ but I get an ERROR when clearly it is false - instead of NO error an 'just' telling var collections = FALSE.

Does this make sense and can you help?

Richard
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Question by:rcbuchanan
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3 Comments
 
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Accepted Solution

by:
_agx_ earned 500 total points
ID: 24338227
Try using structKeyExists first, to verify the key exists.  If it does, then do the rest of your logic.
<cfif structKeyExists( pathNotIncludingTheyKeyYouAreTesting,  "KeyName")>
    ... do something ...
</cfif>

ie Something like:

<cfif structKeyExists(ive_doc.SearchResponse.newsNews.newsResults.newsNewsResult[i].newsNewsCollections.newsNewsCollection.newsNewsArticles, "NEWSNEWSARTICLE")>
    ... do something ...
</cfif>

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Author Comment

by:rcbuchanan
ID: 24338765
Worked perfectly. Thank you (again).
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LVL 52

Expert Comment

by:_agx_
ID: 24338929
You're welcome :)
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