Re: [xsl] question on random numbers for browser XSLT

Subject: Re: [xsl] question on random numbers for browser XSLT
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Sat, 25 Jul 2009 12:03:49 +0200
Michael Kay wrote:
<xsl:template name="rand">
<xsl:param name="scale" select="6" />
<xsl:variable name="seed" />
<xsl:when test="function-available('exsl:node-set')">
<xsl:value-of select="document(concat('/cgi-bin/', $scale, '&amp;x=', generate-id(exsl:node-set($seed))))" />
<xsl:when test="function-available('msxsl:node-set')">
<xsl:value-of select="document(concat('/cgi-bin/', $scale, '&amp;x=', generate-id(msxsl:node-set($seed))))" />


That'll give you six random values, assuming the Perl script recognizes the &x=Idxxxxx as cache-append garbage.
Interesting approach however when I test it with browsers then Firefox (3.0), Opera (9.63) and Safari (3.2) all seem to generate the same id each time that template is called:

Only IE (tested with IE 8) generates different ids.

In XSLT 1.0 (I was surprised to rediscover just now), the value of variable $seed is not a result tree fragment, it is a zero-length string. So I'm a little bit surprised that exslt:node-set() should work on it at all, and not particularly surprised that it should generate the same node-set each time.

The stylesheet I used for testing ( does create a result tree fragment with some contents in xsl:variable. Otherwise the test case would not have worked at all with some implementations (Opera for instance).


	Martin Honnen

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