Re: [xmljs-users] Comparing two DOMDocuments for equality?

[David J. <dj...@ya...>]

Hi Stepan!

There isn't any way currently to do what you're doing, but my suggestion would be to do exactly
what you're proposing. I think you're on the right track.

Good luck!


David

--- Stepan Riha <xm...@no...> wrote:

> Is there an easy way to compare the contents of two W3C DOMDocument objects for
> equality?  Right now I try to do this by comparing (doc1.toString() ==
> doc2.toString()), but that may return false if the order in which attributes
> were added to nodes in the documents is different (even though the documents
> are semantically equivalent).  It would be nice if there was a compare() method
> I could call on the DOMDocument or if the toString() methods would produce a
> canonical form.
> 
> I'm planning to implement the canonical toString() by changing the
> DOMNamedNodeMap_toString() method to concatenate the elements sorted by their
> names.  This should produce the same value regardless of the order in which
> elements were added to the NamedNodeMap.
> 
> The reason I'm doing this is that in my XML editing web app, I want to warn a
> user if they leave the page without having saved the changes they made.  So on
> page load, I capture the current XML document and in my window.onbeforeunload
> handler I compare it with the current (edited) document, and if they differ,
> display a warning.  With the current implementation I sometimes get a warning
> if the user just "clicks around" because I delete/reinsert attributes in a
> different order.
> 
>     - Stepan
> 
> --
> Stepan Riha
> 
> 
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