XSLT <xsl:when> elemens
May 28, 2021 XSL T
Table of contents
XSLT and lt;xsl: when and when elements
The XSLT-lt;xsl:when-gt; element specifies an action that is activated when the condition of the element is met.
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Definitions and usages
The element is used to specify the relevant action for the element. The element evaluates an expression and, if true, performs the specified action.
Note: The elements are used in collaboration with the elements and elements of the .lt;xsl:otherwise;gt; elements to express multiple conditional tests.
Grammar
test="boolean-expression">
<!-- Content: template -->
</xsl:when>
Property
| Attributes | value | describe |
|---|---|---|
| test | boolean-expression | Required.The Boolean expression to be tested. |
Instance 1
The following code adds a pink background color to the artist column when the price of cd is higher than 10.
<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>
Instance 2
A variable named "color" is declared. A ssign its value to the color property of the current element. If the current element does not have a color property, the value of "color" will be "green":
<xsl:choose>
<xsl:when test="@color">
<xsl:value-of select="@color"/>
</xsl:when>
<xsl:otherwise>green</xsl:otherwise>
</xsl:choose>
</xsl:variable>
Complete XSLT element reference manual