练习XSLT

今天终于看完了W3CSchool的xslt教程，做个练习。费了些事，但最终完成了，很高兴。

cd_catalog.xml：

<?xml version="1.0" encoding="utf-8"?><?xml-stylesheet type="text/xsl" href="cd_catalog.xsl" ?><CATALOG> <CD> <TITLE>Empire Burlesque</TITLE> <ARTIST>Bob Dylan</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Columbia</COMPANY> <PRICE>10.90</PRICE> <YEAR>1985</YEAR> </CD> <CD> <TITLE>Hide your heart</TITLE> <ARTIST>Bonnie Tyler</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>CBS Records</COMPANY> <PRICE>39.90</PRICE> <YEAR>1988</YEAR> </CD> <CD> <TITLE>Greatest Hits</TITLE> <ARTIST>Dolly Parton</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>RCA</COMPANY> <PRICE>9.90</PRICE> <YEAR>1982</YEAR> </CD> <CD> <TITLE>Still got the blues</TITLE> <ARTIST>Gary Moore</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Virgin records</COMPANY> <PRICE>10.20</PRICE> <YEAR>1990</YEAR> </CD> <CD> <TITLE>Eros</TITLE> <ARTIST>Eros Ramazzotti</ARTIST> <COUNTRY>EU</COUNTRY> <COMPANY>BMG</COMPANY> <PRICE>9.90</PRICE> <YEAR>1997</YEAR> </CD> <CD> <TITLE>One night only</TITLE> <ARTIST>Bee Gees</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Polydor</COMPANY> <PRICE>10.90</PRICE> <YEAR>1998</YEAR> </CD> <CD> <TITLE>Sylvias Mother</TITLE> <ARTIST>Dr.Hook</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>CBS</COMPANY> <PRICE>8.10</PRICE> <YEAR>1973</YEAR> </CD> <CD> <TITLE>Maggie May</TITLE> <ARTIST>Rod Stewart</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Pickwick</COMPANY> <PRICE>8.50</PRICE> <YEAR>1990</YEAR> </CD> <CD> <TITLE>Romanza</TITLE> <ARTIST>Andrea Bocelli</ARTIST> <COUNTRY>EU</COUNTRY> <COMPANY>Polydor</COMPANY> <PRICE>10.80</PRICE> <YEAR>1996</YEAR> </CD> <CD> <TITLE>When a man loves a woman</TITLE> <ARTIST>Percy Sledge</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Atlantic</COMPANY> <PRICE>8.70</PRICE> <YEAR>1987</YEAR> </CD> <CD> <TITLE>Black angel</TITLE> <ARTIST>Savage Rose</ARTIST> <COUNTRY>EU</COUNTRY> <COMPANY>Mega</COMPANY> <PRICE>10.90</PRICE> <YEAR>1995</YEAR> </CD> <CD> <TITLE>1999 Grammy Nominees</TITLE> <ARTIST>Many</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Grammy</COMPANY> <PRICE>10.20</PRICE> <YEAR>1999</YEAR> </CD> <CD> <TITLE>For the good times</TITLE> <ARTIST>Kenny Rogers</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Mucik Master</COMPANY> <PRICE>8.70</PRICE> <YEAR>1995</YEAR> </CD> <CD> <TITLE>Big Willie style</TITLE> <ARTIST>Will Smith</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Columbia</COMPANY> <PRICE>9.90</PRICE> <YEAR>1997</YEAR> </CD> <CD> <TITLE>Tupelo Honey</TITLE> <ARTIST>Van Morrison</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Polydor</COMPANY> <PRICE>8.20</PRICE> <YEAR>1971</YEAR> </CD> <CD> <TITLE>The very best of</TITLE> <ARTIST>Cat Stevens</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Island</COMPANY> <PRICE>8.90</PRICE> <YEAR>1990</YEAR> </CD> <CD> <TITLE>Stop反反复复</TITLE> <ARTIST>Sam Brown</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>A and M</COMPANY> <PRICE>8.90</PRICE> <YEAR>1988</YEAR> </CD> <CD> <TITLE>Bridge of Spies</TITLE> <ARTIST>T'Pau</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Siren</COMPANY> <PRICE>7.90</PRICE> <YEAR>1987</YEAR> </CD> <CD> <TITLE>Private Dancer</TITLE> <ARTIST>Tina Turner</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>Capitol</COMPANY> <PRICE>8.90</PRICE> <YEAR>1983</YEAR> </CD> <CD> <TITLE>Midt om natten</TITLE> <ARTIST>Kim Larsen</ARTIST> <COUNTRY>EU</COUNTRY> <COMPANY>Medley</COMPANY> <PRICE>7.80</PRICE> <YEAR>1983</YEAR> </CD> <CD> <TITLE>Pavarotti Gala Concert</TITLE> <ARTIST>Luciano Pavarotti</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>DECCA</COMPANY> <PRICE>9.90</PRICE> <YEAR>1991</YEAR> </CD> <CD> <TITLE>The dock of the bay</TITLE> <ARTIST>Otis Redding</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Atlantic</COMPANY> <PRICE>7.90</PRICE> <YEAR>1987</YEAR> </CD> <CD> <TITLE>Picture book</TITLE> <ARTIST>Simply Red</ARTIST> <COUNTRY>EU</COUNTRY> <COMPANY>Elektra</COMPANY> <PRICE>7.20</PRICE> <YEAR>1985</YEAR> </CD> <CD> <TITLE>Red</TITLE> <ARTIST>The Communards</ARTIST> <COUNTRY>UK</COUNTRY> <COMPANY>London</COMPANY> <PRICE>7.80</PRICE> <YEAR>1987</YEAR> </CD> <CD> <TITLE>Unchain my heart</TITLE> <ARTIST>Joe Cocker</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>EMI</COMPANY> <PRICE>8.20</PRICE> <YEAR>1987</YEAR> </CD></CATALOG>

cd_catalog.xsl：

<?xml version="1.0" encoding="utf-8"?><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"><xsl:output method="html" version="4.0" encoding="utf-8" indent="no" /><xsl:variable name="tableheader"><thead> <tr bgcolor="#6699FF"> <th align="left">Title</th> <th align="left">Artist</th> <th align="left">Price</th> <th align="left">Year</th> </tr> </thead></xsl:variable><xsl:template match="/"><html><head><title>学习XSLT</title><mce:style><!--table{border-collapse:collapse;border:1px solid #000;}td,th{border:1px solid #000;padding:8px;}tbody tr:hover td{background:#96F;}--></mce:style><style mce_bogus="1">table{border-collapse:collapse;border:1px solid #000;}td,th{border:1px solid #000;padding:8px;}tbody tr:hover td{background:#96F;}</style></head><body> <h2>My CD Collection</h2> <table border="1"> <xsl:copy-of select="$tableheader" /> <tbody> <xsl:for-each select="CATALOG/CD"> <xsl:sort order="ascending" select="TITLE" /> <xsl:variable name="trcolor"> <xsl:choose> <xsl:when test="PRICE > 10"> <xsl:value-of select="'#00FF00'" /> </xsl:when> <xsl:otherwise> <xsl:value-of select="'#FFFFFF'" /> </xsl:otherwise> </xsl:choose> </xsl:variable> <xsl:variable name="yearcolor"> <xsl:choose> <xsl:when test="$trcolor ='#00FF00' and YEAR > 1990"> <xsl:value-of select="'#FF0000'" /> </xsl:when> <xsl:otherwise> <xsl:value-of select="$trcolor" /> </xsl:otherwise> </xsl:choose> </xsl:variable> <xsl:call-template name="tcd"> <xsl:with-param name="yeartdcolor" select="$yearcolor" /> <xsl:with-param name="cdtrcolor" select="$trcolor" /> </xsl:call-template> </xsl:for-each> </tbody> </table></body></html></xsl:template><xsl:template match="CD" name="tcd" > <xsl:param name="yeartdcolor" select="'#FFFFFF'" /> <xsl:param name="cdtrcolor" select="'#FFFFFF'" /> <tr bgcolor="{$cdtrcolor}"> <td align="left"><xsl:value-of select="current()/TITLE" /></td> <td align="left"><xsl:value-of select="./ARTIST" /></td> <td align="left"><xsl:value-of select="PRICE" /></td> <td align="left" bgcolor="{$yeartdcolor}"><xsl:value-of select="YEAR" /></td> </tr></xsl:template></xsl:stylesheet>

      最后的样子是一个表格，PRICE大于10的那一行的背景是绿色，其中YEAR如果大于1990的，那个单元格背景是红色，否则还是绿色。其它行无样式。

      变量挺好玩的，就是以后不能更改值。尝试在<xsl:call-template>里放<xsl:choose>，结果不行，只能放<xsl:with-param>。做到给TD设置背景色时遇到了问题，根据不同的情况设置背景色，如果用<xsl:choose>会写不少的代码，然后就找更好的方法。乱写了一通，还把<xsl:variable>和$var放到引号中过，肯定都不行。最后放弃时无意中看到了这段代码

      <a href="#{$var}">

     像EL，想到可能是xslt的语法，试了下果然成功了。以外的惊喜让我高兴了好一阵。自学比较艰难。

     还有一个让我不理解，这段代码

     <xsl:when test="PRICE > 10">

    这里居然能玩，可有时候又不行了。