Subject: RE: [xsl] Please help with Grouping & sorting ! ;-( From: "Khan, Amir" <amkhan@xxxxxxxxxx> Date: Wed, 4 Sep 2002 15:32:33 +0100 |
This was the PERFECT solution!... I did have a look at the Muench method, but my head started to spin! ;-) -----Original Message----- From: Helder da Rocha [mailto:helder@xxxxxxxxxxxxxxxx] Sent: 03 September 2002 18:23 To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: Re: [xsl] Please help with Grouping & sorting ! ;-( Hi Amir, You can try a different approach using keys, and avoid the duplicate categories: <xsl:key name="cat key" match="item" use="@category" /> <xsl:template match="catalogue"> <dl> <xsl:for-each select="item[generate-id(.) = generate-id(key('cat key', @category))]"> <xsl:sort select="@category" /> <xsl:for-each select="key('cat key', @category)"> <xsl:sort select="." /> <xsl:if test="position() = 1"> <dt><xsl:value-of select="@category" /></dt> </xsl:if> <dd><xsl:value-of select="." /></dd> </xsl:for-each> </xsl:for-each> </dl> </xsl:template> The result is: gold this is a bracelet this is a ring platinum this is a platinum time piece Silver this is a silver watch Which is what you want (except, probably, putting the first letter in upper-case, but that you can accomplish with translate()). I learned this approach with Doug Tidwell in his great book "XSLT", by O'Reilly. He calls it the "Muench method" (named after the person who suggested it). Helder. -- Helder da Rocha (helder@xxxxxxxxxxxxxxxx) Web Consultant www.argonavis.com.br São Paulo, Brazil +55 (11) 9291 0567 ----- Original Message ----- From: "Khan, Amir" <amkhan@xxxxxxxxxx> To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx> Cc: "Khan, Amir" <amkhan@xxxxxxxxxx> Sent: Tuesday, September 03, 2002 1:26 PM Subject: [xsl] Please help with Grouping & sorting ! ;-( > Hi, > > I have some XML of the form > > <catalogue> > <item price="1" category="gold">this is a bracelet</item> > <item price="5" category="Silver">this is a silver watch</item> > <item price="1" category="gold">this is a ring</item> > <item price="0" category="platinum">this is a platinum time > piece</item> > </catalogue> > > > What I want to do is make a webpage like :- > > Platinum > this is a platinum timepiece > Gold > * this is a bracelet > * this is a ring > Silver > * this is a silver watch > > > I've managed to group & sort the data. My problem is detecting when a new > category appears and then spitting out the label as a Heading. > > I have something like :- > > <xsl:variable name="previousCategory">XXX</xsl:variable> > <xsl:for-each select="item"> > <xsl:sort select="@price" data-type="number" > order="ascending"/> > <!-- If the category has changed then this is a new > "heading" > --> > <xsl:if test="@category[.!=$previousCategory]"> > <xsl:if test="@category[.!="XXX"]"> > <!-- no more than a </UL> --> > <xsl:call-template name="end of group"/> > </xsl:if> > <!-- new group = spit out new heading > no more than a <UL> followed by the @category > --> > <xsl:call-template name="new group"/> > </xsl:if> > <xsl:call-template name="item element"/> > <!-- Store this Category for the next iteration > so we know if we should display a new heading > --> > <xsl:variable name="previousCategory" select="@category"/> > </xsl:for-each> > > <xsl:template name="item element"> > <LI> > <xsl:apply-templates/> > </LI> > </xsl:template> > > > What I actually see is :- > > Platinum > this is a platinum timepiece > Gold > * this is a bracelet > Gold > * this is a ring > Silver > * this is a silver watch > > Its ordered correctly BUT it does'nt realise that its already displayed a > heading (eg Gold) and its not supposed to show it again until it changes to > Silver. I think its because the variable previousCategory is write-once but > then how do I keep track of the previously displayed attribute "category" in > the previous sibling in the SORTED node set? > > Help! ;-(( > > Amir > > -------------------------------------------------------------------------- ---- > This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice. > > > > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list ------------------------------------------------------------------------------ This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice. XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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