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Branching by Using <xsl:if>
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The XSLT standard provides the <xsl:if> element that is equivalent to the if statement provided by many programming languages. Suppose that you wish to display details only where the first name is Nancy. You can achieve this by using <xsl:if> as shown in Listing 6-5. Listing 6-5. Using <xsl:if> < 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> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> </tr> <xsl:for-each select="employees/employee"> <xsl:if test="firstname[text()='Nancy']"> <tr> <td> <xsl:value-of select="@employeeid"/> </td> <td> <xsl:value-of select="firstname"/> </td>
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<td> <xsl:value-of select="lastname"/> </td> <td> <xsl:value-of select="homephone"/> </td> <td> <xsl:value-of select="notes"/> </td> </tr> </xsl:if> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet> This is the same style sheet that we used in our first example, but this time, it includes the <xsl:if> construct. The test attribute of <xsl:if> tests for a specific condition. The condition in our example checks whether the value of the <firstname> element (text()) is Nancy. If it is Nancy, the details are outputted in the resultant HTML table. Figure 6-3 shows a sample view of the Employees.xml file after applying the preceding style sheet.
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Figure 6-3. Output after using <xsl:if>
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Branching by Using <xsl:choose> and <xsl:when>
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The <xsl:choose> and <xsl:when> elements are equivalent to the switch statement used by programming languages. Using our example file, suppose that you wish to display an additional column called Qualification in the resultant HTML table. You wish to search the notes about an employee for certain qualifications and accordingly want to display them in this additional column. Listing 6-6 shows the style sheet that accomplishes this task.
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C HA PTER 6 TRAN SFORM IN G XML WITH XSLT
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Listing 6-6. Using <xsl:choose> and <xsl:when> < 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> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> <th>Qualification</th> </tr> <xsl:for-each select="employees/employee"> <tr> <td> <xsl:value-of select="@employeeid"/> </td> <td> <xsl:value-of select="firstname"/> </td> <td> <xsl:value-of select="lastname"/> </td> <td> <xsl:value-of select="homephone"/> </td> <td> <xsl:value-of select="notes"/> </td> <td> <xsl:choose> <xsl:when test="notes[contains(.,'BA')]"> BA (Arts) </xsl:when> <xsl:when test="notes[contains(.,'BS')]"> BS (Science) </xsl:when> <xsl:when test="notes[contains(.,'BTS')]"> BTS (Other) </xsl:when> <xsl:otherwise> Unknown </xsl:otherwise>
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</xsl:choose> </td> </tr> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet> Notice the markup in bold. The <xsl:choose> element starts the switch statement. Each individual <xsl:when> element tests a specific condition. In our example, we check whether the <notes> element contains BA, BS, or BTS, and accordingly emit the qualification of the employee. If the test fails, the markup from <xsl:otherwise> is emitted. Figure 6-4 shows the table with the Qualification column added.
Figure 6-4. Qualification column added by using <xsl:choose> and <xsl:when>
Transforming Elements and Attributes
Up until now, we have transformed XML data into HTML. However, often you may need to transform XML data into another XML representation. For example, a B2B application might be receiving orders electronically in XML format. While receiving such orders, you must ensure that the source XML markup and expected XML markup match. If they do not match, you can apply XSLT transformations to generate the desired markup. To illustrate how XSLT transformations can convert one XML representation into another, we will transform Employees.xml into another XML representation, as shown in Listing 6-7.
C HA PTER 6 TRAN SFORM IN G XML WITH XSLT
Listing 6-7. Required XML Markup from Employees.xml < xml version="1.0" encoding="utf-8" > <EMPLOYEES> <E1 EMPCODE="1"> <FNAME>Nancy</FNAME> <LNAME>Davolio</LNAME> <PHONE>(206) 555-9857</PHONE> <REMARKS> includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International. </REMARKS> </E1> <E2 EMPCODE="2"> <FNAME>Andrew</FNAME> <LNAME>Fuller</LNAME> <PHONE>(206) 555-9482</PHONE> <REMARKS> Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association. </REMARKS> </E2> <E3 EMPCODE="3"> <FNAME>Janet</FNAME> <LNAME>Leverling</LNAME> <PHONE>(206) 555-3412</PHONE> <REMARKS> Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992. </REMARKS> </E3> </EMPLOYEES> Notice the several changes made to the XML markup: The root node is now <EMPLOYEES> and not <employees>. Each <employee> element is replaced with an element of the form E<employeeid> that is, <E1>, <E2>, and <E3>. That means the element name consists of a constant part (E) followed by the employee ID.
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