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Posted to j-users@xerces.apache.org by Matthias Brunner <mb...@blumenstrasse.vol.at> on 2002/12/05 14:46:58 UTC
isChildOf function?
Hello,
how can I find out whether a node is a child of another node?
"child.getParentNode() == parent" and
"child.getParentNode().equals(parent)" do not seem to work.
Best regards!
--
Matthias Brunner <mb...@blumenstrasse.vol.at>
PGP FP 7862 32B3 3B75 292A F76F 5042 8587 21AB 5B89 D501
Check out http://blumenstrasse.vol.at/~mb/gpgkey.asc
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Re: isChildOf function?
Posted by Matthias Brunner <mb...@blumenstrasse.vol.at>.
On Thursday 05 December 2002 15:14, Joseph Kesselman wrote:
> (As an alumnus of the DOM Working Group, I believe the official
> statement which covers this situation is "oops".)
>
I suspected it the very moment I wrote this mail :)
Thanks for your helpful reply!
--
Matthias Brunner <mb...@blumenstrasse.vol.at>
PGP FP 7862 32B3 3B75 292A F76F 5042 8587 21AB 5B89 D501
Check out http://blumenstrasse.vol.at/~mb/gpgkey.asc
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Re: isChildOf function?
Posted by Joseph Kesselman <ke...@us.ibm.com>.
>how can I find out whether a node is a child of another node?
>"child.getParentNode() == parent" and
>"child.getParentNode().equals(parent)" do not seem to work.
The latter shouldn't work; equals() is not defined for DOM nodes. (Do you
mean "same node" or "equal content"?)
The former should work in Xerces... but is not portable; the DOM does not
guarantee that object identity and node identity are the same thing.
The portable answer will be the DOM Level 3 isSameNode() method.
Unfortunately, since Level 3 is not yet an official Recommendation, and
since not all DOMs will implement Level 3, this is also not fully
portable... but it's the best we're going to get.
Best recommendation I can offer you is to write a wrapper routine that
checks which DOM implementation you're working with and uses isSameNode()
if available and some fallback (probably ==) if not. Or accept that your
code's going to be a bit nonportable, or is going to be locked into DOM3
and later.
(As an alumnus of the DOM Working Group, I believe the official statement
which covers this situation is "oops".)
______________________________________
Joe Kesselman / IBM Research
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