Gary,
On a superficial analysis (which is all I can do, since I don't know
which specific tool you're talking about) I estimate that a JavaScript
solution would be much more costly (i.e. much more demanding on the
servers) than a native solution. As far as I can (theoretically) tell, a
JS solution would involve a juicy piece of AJAX -- as such, it would
have to make entirely new, unjustified requests toward the server in
order to find the previous edit on the user's talk page. Had this been
implemented natively, the whole of that request could be replaced by a
single SQL query. But then again, this is only an outsider's assessment,
maybe things are more/less complicated than I'm estimating.
Cheers,
Gutza
Gary Kirk wrote:
There is something like this in one of the popup
scripts on the English
Wikipeda; it may be Lupin's - I'm not sure - which shows "all changes since
your last edit". Perhaps this could be adapted or implemented as you
suggest.