Xslt 简明教程

XSLT <choose>

<xsl:choose>标签使用<xsl:otherwise>和<xsl:when>元素指定对节点内容的多个条件测试。

<xsl:choose> tag specifies a multiple conditional tests against the content of nodes in conjunction with the <xsl:otherwise> and <xsl:when> elements.

Declaration

以下是 <xsl:choose> 的语法声明。

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

<xsl:choose >
</xsl:choose>

Elements

Number of Occurrences

Unlimited

Parent elements

xsl:attribute, xsl:comment, xsl:copy, xsl:element, xsl:fallback, xsl:for-each, xsl:if, xsl:message, xsl:otherwise, xsl:param, xsl:processing-instruction, xsl:template, xsl:variable, xsl:when, xsl:with-param, output elements

Child elements

xsl:otherwise, xsl:when

Demo Example

此示例通过迭代每个学生来创建带其属性 rollno 及其子属性 <firstname>、<lastname>、<nickname> 和 <marks> 的 <table> 元素。它检查并打印成绩的详细信息。

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 and then prints the grade details.

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>Vaneet</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>
                  <th>Grade</th>
               </tr>

               <xsl:for-each select = "class/student">

                  <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>

                     <td>
                        <xsl:choose>
                           <xsl:when test = "marks > 90">
                              High
                           </xsl:when>

                           <xsl:when test = "marks > 85">
                              Medium
                           </xsl:when>

                           <xsl:otherwise>
                              Low
                           </xsl:otherwise>
                        </xsl:choose>
                     </td>
                  </tr>
               </xsl:for-each>
            </table>
         </body>
      </html>
   </xsl:template>
</xsl:stylesheet>

Output