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_nhok_
Participant
January 4, 2009
Question

Getting attributes from xml-node

  • January 4, 2009
  • 4 replies
  • 1125 views
Hello all,

I am trying to use the LrXml functions for analyesing an xml-file.
I am parsing the file, so that I get a XML DOM object (domObj) of the following node


öklasjdf
asdfas


Now I want to access the attributes, so I wrote in lua

local attr = domObj.attributes()

But I didn't find a way to access the attributes itselfs, I think mainly because I am not very familiar with lua. I tried the following two code sequences, but I always didn't get a result.

local var1 = attr._mngid.value
local var2 = attr["_mngid"].value

Can somebody give me a hint, who the correct code sequnce would be to access the attribute of the node (that means, getting the value "23" out of it)?

Thanks much in advanced!

best regards
Bernhard
This topic has been closed for replies.

4 replies

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_nhok_Author
Participant
January 4, 2009
Hello Herb,

thank you very much for your help, I now located the problem, it was lying inside my own code (I tried to access attr._mngid.value at a node, where no attribute _mngid exist), now it works everything allright.

best regards
Bernie
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_Herb_Albert_
Known Participant
January 4, 2009
Your code looks correct to me (although it doesn't really trace the attribute value). Maybe the issue is located somewhere outside the scope of LrXml. Is the plug-in set to be reloaded every time it is called?

If this does not help you might post the complete relevant code portion [preferably inside a html <pre> tag] so that we could make further investigation. ;)
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_nhok_Author
Participant
January 4, 2009
Hello Herb,

thanks for the tip, you are right, I missed the difference between colon and point!

I tried it out with colon, but I also get with both code no return value. It seems, that something is wrong with the way I address the return code of domObj:attributes()

local var1 = attr._mngid.value
local var2 = attr["_mngid"].value

If I place some logger Output in the code above, I never see the second call of myLogger:trace("var1")

myLogger:trace("start")
local var1 = attr._mngid.value
myLogger:trace("var1")
local var2 = attr["_mngid"].value
myLogger:trace("var2")

any Idea?

best regards
Bernie
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_Herb_Albert_
Known Participant
January 4, 2009
Hallo Bernhard.

The attributes method should be called using the colon operator: 
local attr = domObj:attributes()

Which is another notation for 
local attr = domObj.attributes(domObj)

(So that the function implementation may access the actual instance to work on.) Small change and your code should work as intended.

Herb
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