XSLT <choose>元素 - tw511教學網

<xsl:choose>標記指定針對節點內容的多個條件測試以及<xsl:otherwise>和<xsl:when>元素。

宣告

以下是<xsl:choose>元素的語法宣告。

<xsl:choose >
</xsl:choose>

元素

父元素 - 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, 輸出元素
子元素 - xsl:otherwise, xsl:when

範例

此範例通過疊代每個學生建立一個<student>元素的表格，其元素屬性為rollno，其子元素：<firstname>，<lastname>，<nickname>和<marks>。它會檢查並列印等級詳細資訊。

檔案：students.xml -

<?xml version = "1.0"?>
<?xml-stylesheet type = "text/xsl" href = "students.xsl"?> 
<class> 
   <student rollno = "10010">
      <firstname>Machine</firstname> 
      <lastname>Lee</lastname> 
      <nickname>Machine</nickname> 
      <marks>85</marks>
   </student> 
   <student rollno = "10020"> 
      <firstname>Max</firstname> 
      <lastname>Su</lastname> 
      <nickname>Maxsu</nickname> 
      <marks>95</marks>
   </student> 
   <student rollno = "10030"> 
      <firstname>Yii</firstname> 
      <lastname>Bai</lastname> 
      <nickname>Yiibai</nickname> 
      <marks>90</marks> 
   </student> 
</class>

檔案：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>學生資訊列表</h2> 
            <table border = "1"> 
               <tr bgcolor = "#3498db"> 
                  <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>

在瀏覽器中打上面檔案：student.xml，效果如下所示 -