Re: Strange behaviour with nodelist iteration

[Michael Glavassevich <mr...@ca.ibm.com>]

Hi Daniele,

NodeLists [1] are live objects. That is if you make changes to the 
document these will be immediately reflected in the relevant NodeList 
objects. This is expected behaviour, though possibly confusing for users.

[1] 
http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-536297177

"Daniele Madama" <d....@pro-netics.com> wrote on 10/27/2004 11:15:18 
AM:

> Hi,
> I don't known if this is the expected behaviour or not, but this result
> strange for me:
> 
> I have this code
> 
>   NodeList childs = this.doc.getDocumentElement().getChildNodes();
> System.out.println("Size = " + childs.getLength());
>   for(int i=0; i<childs.getLength(); i++) {
>     Node child = childs.item(i);
>     System.out.println((i+1)+"/"+childs.getLength()+" - "
> +child.getNodeName());
>   }
> 
> and the output is
> 
> Size = 10
> 1/10 - node1
> 2/10 - node2
> 3/10 - node3
> 4/10 - node4
> 5/10 - node5
> 6/10 - node6
> 7/10 - node7
> 8/10 - node8
> 9/10 - node9
> 10/10 - node10
> 
> Well, this is correct, no problem, but if I append any child to other
> element the output is not the same
> 
>   NodeList childs = this.doc.getDocumentElement().getChildNodes();
> System.out.println("Size = " + childs.getLength());
>   Element parent = this.doc.createElement("parent");
>   for(int i=0; i<childs.getLength(); i++) {
>     Node child = childs.item(i);
>     System.out.println((i+1)+"/"+childs.getLength()+" - "
> +child.getNodeName());
>     parent.appendChild(child);
>   }
> 
> the output now is
> 
> Size = 10
> 1/10 - node1
> 2/9 - node3
> 3/8 - node5
> 4/7 - node7
> 5/6 - node9
> 
> This is for me not the expected result, this is a bug/problem or the
> problem is only mine that don't know the real behaviour of xerces? ;)
> 
> 
> TIA,
> 
> 
> 
> -- 
> Daniele Madama
> 
> Pro-netics s.r.l.
> Via Elio Lampridio Cerva 127/c
> Roma
> Tel. 0651530849
> http://www.pro-netics.com
> 
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Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org