无涯教程-XPath - Number Functions/Operators函数

无涯教程
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XPath在与XPath表达式一起使用的数字上定义了以下运算符。

S.No. Operator & 描述
1

+

用于加法运算
2

-

用于减法运算
3

*

用于乘法运算
4

div

用于除法运算
5

mod

用于模运算

XPath在与XPath表达式一起使用的数字上定义了以下函数。

S.No. Function & 描述
1

ceiling()

返回大于提供的值的最小整数。
2

floor()

返回小于提供的值的最大整数。
3

round()

将舍入的值返回到最接近的整数。
4

sum()

返回两个数字的和。

示例

本示例通过遍历每个学生，创建一个<student>元素的表，其属性为roll no，其子元素为<firstname>，<lastname> <nickname>和<marks>。它计算学生的成绩，然后打印学生的详细信息。

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>


        </span><span class="tag">&lt;table</span><span class="pln"> </span><span class="atn">border</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"1"</span><span class="tag">&gt;</span><span class="pln">
           </span><span class="tag">&lt;tr</span><span class="pln"> </span><span class="atn">bgcolor</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"#9acd32"</span><span class="tag">&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">Roll No</span><span class="tag">&lt;/th&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">First Name</span><span class="tag">&lt;/th&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">Last Name</span><span class="tag">&lt;/th&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">Nick Name</span><span class="tag">&lt;/th&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">Marks</span><span class="tag">&lt;/th&gt;</span><span class="pln">
              </span><span class="tag">&lt;th&gt;</span><span class="pln">Grade</span><span class="tag">&lt;/th&gt;</span><span class="pln">
           </span><span class="tag">&lt;/tr&gt;</span><span class="pln">
				
           </span><span class="tag">&lt;xsl:for-each</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"class/student"</span><span class="tag">&gt;</span><span class="pln">
              </span><span class="tag">&lt;tr&gt;</span><span class="pln">
                 </span><span class="tag">&lt;td&gt;&lt;xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"@rollno"</span><span class="tag">/&gt;&lt;/td&gt;</span><span class="pln">
                 </span><span class="tag">&lt;td&gt;&lt;xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"firstname"</span><span class="tag">/&gt;&lt;/td&gt;</span><span class="pln">
                 </span><span class="tag">&lt;td&gt;&lt;xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"lastname"</span><span class="tag">/&gt;&lt;/td&gt;</span><span class="pln">
                 </span><span class="tag">&lt;td&gt;&lt;xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"nickname"</span><span class="tag">/&gt;&lt;/td&gt;</span><span class="pln">
                 </span><span class="tag">&lt;td&gt;&lt;xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"marks"</span><span class="tag">/&gt;&lt;/td&gt;</span><span class="pln">
						
                 </span><span class="tag">&lt;td&gt;</span><span class="pln">
                    </span><span class="tag">&lt;xsl:choose&gt;</span><span class="pln">
                       </span><span class="tag">&lt;xsl:when</span><span class="pln"> </span><span class="atn">test</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"marks div 90 &gt;</span><span class="pln"> 1"&gt;
                          High
                       </span><span class="tag">&lt;/xsl:when&gt;</span><span class="pln">
						
                       </span><span class="tag">&lt;xsl:when</span><span class="pln"> </span><span class="atn">test</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"marks div 80 &gt;</span><span class="pln"> 1"&gt;
                          Medium
                       </span><span class="tag">&lt;/xsl:when&gt;</span><span class="pln">
						
                       </span><span class="tag">&lt;xsl:otherwise&gt;</span><span class="pln">
                          Low
                       </span><span class="tag">&lt;/xsl:otherwise&gt;</span><span class="pln">
                    </span><span class="tag">&lt;/xsl:choose&gt;</span><span class="pln">
  
                 </span><span class="tag">&lt;/td&gt;</span><span class="pln">
              </span><span class="tag">&lt;/tr&gt;</span><span class="pln">	
           </span><span class="tag">&lt;/xsl:for-each&gt;</span><span class="pln">
        </span><span class="tag">&lt;/table&gt;</span><span class="pln">
     </span><span class="tag">&lt;/body&gt;</span><span class="pln">
  </span><span class="tag">&lt;/html&gt;</span><span class="pln">



</xsl:template>


</xsl:stylesheet>

验证输出

Formatted Number Operator Output

参考链接

www.learnfk.com/xpath/xpath…

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