XSLT <message>


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<message> tag element helps to debug an XSLT processing. It is similar to javascript alerts. <xsl:> tag buffers a message to XSLT processor which terminates the processing and sends a message to the caller application to display the error message.

Declaration

Following is the syntax declaration of <xsl:message> element.

<xsl:message 
   terminate = "yes" | "no" >
</xsl:message>

Attributes

S.No Name & Description
1.

terminate

It specifies whether the transformation should terminate upon executing this instruction or not. Default is "yes".

Elements

Number of Occurrences Unlimited
Parent elements

xsl:attribute, xsl:comment, xsl:copy, xsl:element, xsl:fallback, xsl:foreach, xsl:if, xsl:message, xsl:otherwise, xsl:param, xsl:processinginstruction, xsl:template, xsl:variable, xsl:when, xsl:with-param, output elements

Child elements

xsl:apply-templates, xsl:attribute, xsl:call-template, xsl:choose, xsl:comment, xsl:copy, xsl:copy-of, xsl:element, xsl:for-each, xsl:if, xsl:processing-instruction, xsl:text, xsl:value-of, xsl:variable, output elements

Demo Example

This example creates a table of <student> element with its attribute rollno and its child <firstname>, <lastname>, <nickname>, and <marks> by iterating over each student. It checks key as firstname to be present and then prints the student details, otherwise displays an error message.

students.xml

<?xml version = "1.0"?> 
<?xml-stylesheet type = "text/xsl" href = "students.xsl"?> 
<class> 
   <student rollno = "393"> 
      <firstname>Dinkar</firstname> 
      <lastname>Kad</lastname> 
      <nickname>Dinkar</nickname> 
      <marks>85</marks> 
   </student> 
   <student rollno = "493"> 
      <firstname></firstname> 
      <lastname>Gupta</lastname> 
      <nickname>Vinni</nickname> 
      <marks>95</marks> 
   </student> 
   <student rollno = "593"> 
      <firstname>Jasvir</firstname> 
      <lastname>Singh</lastname> 
      <nickname>Jazz</nickname> 
      <marks>90</marks> 
   </student> 
</class>

students.xsl

<?xml version = "1.0" encoding = "UTF-8"?> 
<xsl:stylesheet version = "1.0" 
   xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">   
   <xsl:template match = "/"> 
      <html> 
         <body> 
            <h2>Students</h2> 
            <table border = "1"> 
               <tr bgcolor = "#9acd32"> 
                  <th>Roll No</th> 
                  <th>First Name</th> 
                  <th>Last Name</th> 
                  <th>Nick Name</th> 
                  <th>Marks</th> 
               </tr> 
					
               <xsl:for-each select = "class/student"> 
					
                  <xsl:if test = "firstname = ''"> 
                     <xsl:message terminate = "yes">A first name field is empty. 
                     </xsl:message> 
                  </xsl:if> 
					
                  <tr> 
                     <td><xsl:value-of select = "@rollno"/></td> 
                     <td><xsl:value-of select = "firstname"/></td> 
                     <td><xsl:value-of select = "lastname"/></td>
                     <td><xsl:value-of select = "nickname"/></td> 
                     <td><xsl:value-of select = "marks"/></td> 
                  </tr> 
               </xsl:for-each> 
            </table> 
         </body> 
      </html> 
   </xsl:template>
</xsl:stylesheet> 

Output

Formatted Message Output

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