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XSL/XSLT 中的 <xsl:choose>

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-01   浏览: 717 ::
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The <xsl:choose> element is used in conjunction with <xsl:when> and <xsl:otherwise> to express multiple conditional tests.
<xsl:choose>元素通过<xsl：when>和<xsl:otherwise>一起配合使用来表达多种条件语句。

The <xsl:choose> Element
<xsl:choose>元素

Syntax
语法

<xsl:choose>

 <xsl:when test="expression">
 ... some output ...
 </xsl:when>
 <xsl:otherwise>
 ... some output ....
 </xsl:otherwise>
</xsl:choose>

 

Where to put the Choose Condition
如何提出选择条件

To insert a multiple conditional test against the XML file, add the <xsl:choose>, <xsl:when>, and <xsl:otherwise> elements to the XSL file:
如果你希望向XML文件中插入一个多重条件语句，可以在XSL文件中添加<xsl:choose>，<xsl:when>以及<xsl:otherwise>元素：

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
 <html>
 <body>
 <h2>My CD Collection</h2>
 <table border="1">

 <tr bgcolor="#9acd32">
 <th>Title</th>
 <th>Artist</th>
 </tr>

 <xsl:for-each select="catalog/cd">
 <tr>
 <td><xsl:value-of select="title"/></td>
	<xsl:choose>
 <xsl:when test="price > 10">
 <td bgcolor="#ff00ff">
 <xsl:value-of select="artist"/></td>
 </xsl:when>
 <xsl:otherwise>
 <td><xsl:value-of select="artist"/></td>
 </xsl:otherwise>
 </xsl:choose>
 </tr>
 </xsl:for-each>
 </table>
 </body>
 </html>
 </xsl:template>
</xsl:stylesheet>

The code above will add a pink background-color to the "Artist" column WHEN the price of the CD is higher than 10.
当CD的价格高于10 时，上述代码会将红色背景色添加到对应的”Artist”专栏。

The result of the transformation will look like this:
转换结果如下：

My CD Collection
我的CD集

Title Artist
Empire Burlesque Bob Dylan
Hide your heart Bonnie Tyler
Greatest Hits Dolly Parton
Still got the blues Gary Moore
Eros Eros Ramazzotti
One night only Bee Gees
Sylvias Mother Dr.Hook
Maggie May Rod Stewart
Romanza Andrea Bocelli
When a man loves a woman Percy Sledge
Black angel Savage Rose
1999 Grammy Nominees Many
For the good times Kenny Rogers
Big Willie style Will Smith
Tupelo Honey Van Morrison
Soulsville Jorn Hoel
The very best of Cat Stevens
Stop Sam Brown
Bridge of Spies T`Pau
Private Dancer Tina Turner
Midt om natten Kim Larsen
Pavarotti Gala Concert Luciano Pavarotti
The dock of the bay Otis Redding
Picture book Simply Red
Red The Communards
Unchain my heart Joe Cocker

View the XML file, View the XSL file, and View the result
XML文件, XSL文件, 以及 最终结果

Another Example
其它案例

Here is another example that contains two <xsl:when> elements:
这里举出另外一个案例，其中包含2个<xsl:when>元素：

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
 <html>
 <body>
 <h2>My CD Collection</h2>
 <table border="1">

 <tr bgcolor="#9acd32">
 <th>Title</th>
 <th>Artist</th>
 </tr>

 <xsl:for-each select="catalog/cd">
 <tr>
 <td><xsl:value-of select="title"/></td>
	<xsl:choose>
 <xsl:when test="price > 10">
 <td bgcolor="#ff00ff">
 <xsl:value-of select="artist"/></td>
 </xsl:when>
 <xsl:when test="price < 9">
 <td bgcolor="#cccccc">
 <xsl:value-of select="artist"/></td>
 </xsl:when>
 <xsl:otherwise>
 <td><xsl:value-of select="artist"/></td>
 </xsl:otherwise>
 </xsl:choose>
 </tr>
 </xsl:for-each>
 </table>
 </body>
 </html>
</xsl:template>
</xsl:stylesheet>

The code above will add a pink background color to the "Artist" column WHEN the price of the CD is higher than 10, and a grey background-color WHEN the price of the CD is higher than 9 and lower or equal to 10.
当CD的价格高于10时，上面的这些代码会将红色背景色添加到对应的“Artist”专栏；当CD的价格大于9小于等于10时，会将灰色背景色添加到对应的“Artist”专栏。

The result of the transformation will look like this:
转换结果如下：

My CD Collection
我的CD集

Title Artist
Empire Burlesque Bob Dylan
Hide your heart Bonnie Tyler
Greatest Hits Dolly Parton
Still got the blues Gary Moore
Eros Eros Ramazzotti
One night only Bee Gees
Sylvias Mother Dr.Hook
Maggie May Rod Stewart
Romanza Andrea Bocelli
When a man loves a woman Percy Sledge
Black angel Savage Rose
1999 Grammy Nominees Many
For the good times Kenny Rogers
Big Willie style Will Smith
Tupelo Honey Van Morrison
Soulsville Jorn Hoel
The very best of Cat Stevens
Stop Sam Brown
Bridge of Spies T`Pau
Private Dancer Tina Turner
Midt om natten Kim Larsen
Pavarotti Gala Concert Luciano Pavarotti
The dock of the bay Otis Redding
Picture book Simply Red
Red The Communards
Unchain my heart Joe Cocker

View the XML file, View the XSL file, and View the result
XML文件, XSL文件, 以及 最终结果

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