test if current-grouping-key() has changed?

bonekrusher · October 24th, 2008, 09:34 AM

Hi,

Is it possible to detect if the value of current-grouping-key() has changed in a for-each-group instruction. For example:

Code:

<xsl:for-each-group select="doc($geis)//number" group-by=".">
    <xsl:sort select="current-grouping-key()" order="ascending"/>
    <xsl:if test="????"> 
        <a name="{substring(current-grouping-key(), 1, 1)}"/>
    </xsl:if>
......

Thanks for the help.

Bones

mhkay · October 24th, 2008, 09:48 AM

xsl:for-each-group evaluates the body of the instruction once for each distinct value of the grouping key. So current-grouping-key() will always be different from the previous iteration, by definition.

Perhaps you should explain what you are trying to achieve.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

bonekrusher · October 24th, 2008, 10:04 AM

Thank you Michael,

I am grouping part numbers in alpha-numeric order for html output. As I iterate through the for-each-group, I print out the current-grouping-key(). But I need to drop an anchor in for the index.
e.g.

Code:

<a name="{substring(current-grouping-key(), 1, 1)}"/>

I only want to do this once there is a change in the current-group()..
eg. A, B, C....

Thanks for the help.

mhkay · October 24th, 2008, 10:22 AM

Sounds like you need two levels of grouping: group first on the initial letter of the key, then on the full key.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

bonekrusher · October 24th, 2008, 10:35 AM

That's the trick.

Thanks!