| position() Function | |
| Returns a number equal to the context position from the current context. | |
| Inputs | |
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None. |
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| Output | |
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A number equal to the position of the current node in the evaluation context. |
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| Defined in | |
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XPath section 4.1, Node Set Functions. |
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| Examples | |
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This example uses the position() function to determine the background color of the rows of a table. The background colors cycle through the options white, darkgray, and lightgreen. Here's the XML document we'll use: <?xml version="1.0"?> <list> <title>A few of my favorite albums</title> <listitem>A Love Supreme</listitem> <listitem>Beat Crazy</listitem> <listitem>Here Come the Warm Jets</listitem> <listitem>Kind of Blue</listitem> <listitem>London Calling</listitem> <listitem>Remain in Light</listitem> <listitem>The Joshua Tree</listitem> <listitem>The Indestructible Beat of Soweto</listitem> </list> We'll use this stylesheet to generate our HTML document:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:template match="/">
<html>
<head>
<title>
<xsl:value-of select="/list/title"/>
</title>
</head>
<body>
<h1>
<xsl:value-of select="/list/title"/>
</h1>
<table border="1">
<xsl:for-each select="/list/listitem">
<xsl:variable name="background-color">
<xsl:choose>
<xsl:when test="position() mod 3 = 1">white</xsl:when>
<xsl:when test="position() mod 3 = 2">darkgray</xsl:when>
<xsl:otherwise>lightgreen</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<tr bgcolor="{$background-color}">
<td>
<b><xsl:value-of select="."/></b>
</td>
</tr>
</xsl:for-each>
</table>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
Our stylesheet generates the following results: <html> <head> <META http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>A few of my favorite albums</title> </head> <body> <h1>A few of my favorite albums</h1> <table border="1"> <tr bgcolor="white"> <td><b>A Love Supreme</b></td> </tr> <tr bgcolor="darkgray"> <td><b>Beat Crazy</b></td> </tr> <tr bgcolor="lightgreen"> <td><b>Here Come the Warm Jets</b></td> </tr> <tr bgcolor="white"> <td><b>Kind of Blue</b></td> </tr> <tr bgcolor="darkgray"> <td><b>London Calling</b></td> </tr> <tr bgcolor="lightgreen"> <td><b>Remain in Light</b></td> </tr> <tr bgcolor="white"> <td><b>The Joshua Tree</b></td> </tr> <tr bgcolor="darkgray"> <td><b>The Indestructible Beat of Soweto</b></td> </tr> </table> </body> </html> When rendered, the HTML file looks like Figure C-8. HTML file displaying items with different background colors |
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