Example of <xsl:message>
This example demonstrates use of the <xsl:message>
element.
The style sheet verifies that the <name>
element within a <record>
element has been filled in. If a <name>
element is empty, a message indicating that the XML is invalid is output.
In the XML file, a name is not supplied for the <name>
element in the second record element.
Note To test this example, you need to use a script. For more information, see Initiate XSLT in a Script.
XML File (records.xml)
<?xml version='1.0'?> <?xml-stylesheet type="text/xsl" href="message.xsl" ?> <records> <record> <name>David Perry</name> <address>222 Cherry</address> <phone>555-797-79797</phone> </record> <record> <name></name> <address>312 Elm</address> <phone>555-797-79797</phone> </record> </records>
XSLT File (message.xsl)
<?xml version='1.0'?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > <xsl:template match="/"> <xsl:apply-templates select="*"/> <xsl:copy-of select="."/> </xsl:template> <xsl:template match="*"> <xsl:apply-templates select="//record"/> </xsl:template> <xsl:template match="record"> <xsl:if test="name=''"> <xsl:message terminate="yes">A name field is empty. </xsl:message> </xsl:if> </xsl:template> </xsl:stylesheet>
Output
The formatted output is the following error message in Internet Explorer:
A name field is empty.
This the processor output:
<?xml version="1.0" encoding="UTF-16"?>