xsl , sum of nodes which satisfy a certain condition - xslt

Question

i would like to know how to get sum of nodes only when they satisfy a condition,having the xml:
<segma>
<conservacio>
<cons estat="A">Excel·lent conservació</cons>
<cons estat="B">Bona conservació</cons>
<cons estat="C">Regular conservació</cons>
<cons estat="D">Mala conservació</cons>
</conservacio>
<categories>
<categoria cat="1">Mobiliari</categoria>
<categoria cat="2">Alimentació</categoria>
<categoria cat="3">Roba</categoria>
</categories>
<clients>
<registre dni="111">Marti</registre>
<registre dni="222">Jana</registre>
<registre dni="333">Edu</registre>
<registre dni="444">Santi</registre>
<registre dni="555">Mia</registre>
<registre dni="666">Pau M</registre>
</clients>
<productes>
<prod id="1" cons="A" cat="1">
<nom>Cuna</nom>
<preu_nou>70</preu_nou>
<preu>30</preu>
<ofertes>
<oferta client="111" />
<oferta client="333" />
</ofertes>
<venta client="111" />
</prod>
<prod id="2" cons="B" cat="2">
<nom>Baby cook</nom>
<preu_nou>120</preu_nou>
<preu>60</preu>
<ofertes>
<oferta client="111" />
<oferta client="333" />
<oferta client="444" />
<oferta client="555" />
</ofertes>
<venta client="555" />
</prod>
<prod id="3" cons="A" cat="1">
<nom>Mama pata</nom>
<preu_nou>70</preu_nou>
<preu>5</preu>
<ofertes>
<oferta client="444" />
<oferta client="555" />
</ofertes>
<venta client="444" />
</prod>
<prod id="4" cons="B" cat="3">
<nom>Conjunt xandall</nom>
<preu_nou>40</preu_nou>
<preu>15</preu>
<ofertes>
<oferta client="222" />
<oferta client="555" />
</ofertes>
<venta client="222" />
</prod>
<prod id="5" cons="C" cat="3">
<nom>Pack 3 texans</nom>
<preu_nou>70</preu_nou>
<preu>25</preu>
<ofertes>
<oferta client="333" />
<oferta client="444" />
<oferta client="555" />
</ofertes>
<venta client="333" />
</prod>
<prod id="6" cons="A" cat="2">
<nom>Saca leches</nom>
<preu_nou>130</preu_nou>
<preu>70</preu>
<ofertes>
<oferta client="111" />
<oferta client="222" />
<oferta client="555" />
</ofertes>
<venta client="111" />
</prod>
<prod id="7" cons="C" cat="2">
<nom>Llet continuació</nom>
<preu_nou>11</preu_nou>
<preu>3</preu>
<ofertes>
</ofertes>
</prod>
</productes>
</segma>
I want to make a list of which products has a client bought(prod/venta/#client), and the sum of prices("preu") of the products:
Having an xsl like :
<h2>Ex 4</h2>
<table border="1">
<xsl:for-each select="//registre">
<xsl:variable name="dni" select="#dni"/>
<tr>
<td> <xsl:value-of select="."/></td>
<xsl:for-each select="//prod">
<xsl:if test="venta/#client=$dni">
<td><xsl:value-of select="nom"/></td>
</xsl:if>
</xsl:for-each>
I would like to get an output like :
client1 prod1 prod2 sum_of_price_prod1+prod2
client2 prod4 prod6 prod 7 sum_of_price_of(prod4+prod6+prod7)
Ex: Maria Baby Cook Texans 744.35
Sorry for the bad english.

Answer 1

You can define a variable to hold all the prod elements current...
<xsl:variable name="prod" select="//prod[venta/#client=$dni]" />
Then you can list select the prod elements like so...
<xsl:for-each select="$prod">
And to get the total sum you can do this...
<xsl:value-of select="sum($prod/preu)" />
Try this XSLT
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html" doctype-public="XSLT-compat" omit-xml-declaration="yes" encoding="UTF-8" indent="yes" />
<xsl:template match="/">
<h2>Ex 4</h2>
<table border="1">
<xsl:for-each select="//registre">
<xsl:variable name="dni" select="#dni"/>
<xsl:variable name="prod" select="//prod[venta/#client=$dni]" />
<tr>
<td><xsl:value-of select="."/></td>
<td>
<xsl:for-each select="$prod">
<xsl:value-of select="nom"/><br />
</xsl:for-each>
</td>
<td>
<xsl:value-of select="sum($prod/preu)" />
</td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>
Alternatively, you could use an xsl:key to look up the prod elements
<xsl:key name="prod" match="prod" use="venta/#client" />
Try this XSLT too
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html" doctype-public="XSLT-compat" omit-xml-declaration="yes" encoding="UTF-8" indent="yes" />
<xsl:key name="prod" match="prod" use="venta/#client" />
<xsl:template match="/">
<h2>Ex 4</h2>
<table border="1">
<xsl:for-each select="//registre">
<tr>
<td><xsl:value-of select="."/></td>
<td>
<xsl:for-each select="key('prod', #dni)">
<xsl:value-of select="nom"/><br />
</xsl:for-each>
</td>
<td>
<xsl:value-of select="sum(key('prod', #dni)/preu)" />
</td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>