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Re: Re: Re: Selecting a random node from source-tree

Subject: Re: Re: Re: Selecting a random node from source-tree
From: "Martin Lormes" <martin.lormes@xxxxxxx>
Date: Thu, 26 Sep 2002 20:37:01 +0200
xslt random node
Oh boy I was blind. Thanks for opening my eyes on this:

I cannot pass parameters. That would have made things fairly easy because I
could have generated a random number outside the transformation.

But -- using any number from the source doc as a seed was the clou. There
will be one number in my source doc, that increments every time I run the
transformation. That'll do!

Unfortunately I may have to drop the FXSL stuff, due to performance and
maintainability. I want to distribute a single XSLT file, which must be kept
as simple as possible. XSLT beginners must be able to apply changes
themselves. *sigh* Your random.xsl is fairly complex. However: using that
incrementing number plus mod will do the trick in this case.


Thanks for the inspiration!


Martin Lormes



> > > > I was thinking of an XPath expression like this:
> > > >
> > > > document('funnies.xml')/funnies/quote[random()]
> > > >
> > > > Can I avoid using extension elements?
> > >
> > > Yes, use the "randNext" template from FXSL.
> > >
> > > More information is contained in the article:
> > >
> > > "Casting the Dice with FXSL: Random Number Generation Functions in
> > > XSLT"
> > >
> > > http://fxsl.sourceforge.net
> > > /articles/Random/Casting%20the%20Dice%20with%20FXSL-htm.htm
> > >
> > > Hope this helped.
> >
> >
> > Thanks, Dimitre. Awsome article!
> >
> > Unfortunately I always get the same random number (which makes
> > perfect
> > sense, since I can't dynamically generate a starting number :-( )
> >
> > So I must add this as a condition to my original question: the
> > stylesheet is
> > static. No way of changing that.
> >
> >
> > Thanks for your help.
> > Martin Lormes
>
>
> That's easy -- have the minutes or seconds part of the current time (or
> whatever else you find appropriate) passed as a parameter to the
> stylesheet and use that as the seed (or use a subsequence of the
> original sequence, starting with the element having index equal to this
> parameter.



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