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Incrementing and checking the counter variable in XSLT

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梦毁少年i
梦毁少年i 2020-11-29 09:56

I am having little difficulty in assigning a counter variable and incrementing it and then checking for a certain value in XSLT. Here is my code:
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  • 既然无缘
    2020-11-29 10:09

    'Variables' in XSL are actually constants - you cannot change their value. This:

    <xsl:value-of select="$counter + 1"/>

    will just output the value of $counter+1

    To do loops you have to use recursion - e.g.:

    <xsl:stylesheet 
  version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <xsl:template name="loop">
    <xsl:param name="i"/>
    <xsl:param name="limit"/>
    <xsl:if test="$i &lt;= $limit">
      <div>
        <xsl:value-of select="$i"/>
      </div>
      <xsl:call-template name="loop">
        <xsl:with-param name="i" select="$i+1"/>
        <xsl:with-param name="limit" select="$limit"/>
      </xsl:call-template>
    </xsl:if>
  </xsl:template>

  <xsl:template match="/">
    <html>
      <body>
        <xsl:call-template name="loop">
          <xsl:with-param name="i" select="0"/>
          <xsl:with-param name="limit" select="10"/>
        </xsl:call-template>
      </body>
    </html>
  </xsl:template>

</xsl:stylesheet>

    altough it is better to try to avoid loops - in most cases the XSL can be written to avoid it, but I don't understand enough of what are you trying to achieve to give you the complete solution.

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  • 别那么骄傲
    2020-11-29 10:12

    We cant update xsl:variable as they are just like constants. But we can updated dp:local-variables, so here dp:local-variable counter is initialized before starting for-loop. Each time loop is run counter will update itself by 1. Try This:

    <?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" <xsl:variable name="empty_string"/>
    <xsl:template match="/Collection">
        <dp:set-local-variable name="'counter'" value="0"/>
        <xsl:for-each select="Content">
            <dp:set-local-variable name="'counter'" value="dp:local-variable('counter')+1"/>
            <xsl:sort select="Html/root/Event/start_date" order="ascending"/>
            <xsl:variable name="isFutureEvent">
                <xsl:value-of select="syscom:isFutureDate(Html/root/Event/start_date)" />
            </xsl:variable>

            <xsl:if test="Html/root/Event != $empty_string">
                <xsl:if test="$isFutureEvent='true'">

                    <xsl:value-of select="dp:local-variable('counter')"/>
                    <!-- Test if Counter < 4 -->
                    <xsl:if test="dp:local-variable('counter') &lt; 3">
                        <div class="media">
                            <!-- Do stuff here -->
                        </div>
                    </xsl:if>
                    <!-- End if for counter -->  
                </xsl:if>
            </xsl:if>
            <!--</xsl:when>-->
            <!--</xsl:choose>-->
        </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>
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  • 清歌不尽
    2020-11-29 10:15

    I have same problem. I need increment value in loop. So the simplest way was include Saxon and use that value.

    if you use Saxon 6.5.5

    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
...
xmlns:saxon="http://icl.com/saxon"
extension-element-prefixes="saxon"
version="3.0">

    if you use Saxon 9.4.0.4

    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
...
xmlns:saxon="http://saxon.sf.net/"
extension-element-prefixes="saxon"
version="3.0">

    And after that you can simply use saxon variable :

    <xsl:variable name="counter" select="0" saxon:assignable="yes"/> <!-- declare value -->

<saxon:assign name="counter" select="$counter+1"/> <!-- increment value, you can do it in loop for example-->

<xsl:value-of select="$counter"></xsl:value-of> <!-- print value -->
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  • 说谎
    2020-11-29 10:19

    In case any one wants to do this while using .net (XslCompiledTransform) you can use

    <xsl:stylesheet ...  xmlns:customCode="urn:customCode">

<msxsl:script language="VB" implements-prefix="customCode">
    <![CDATA[
    private mCounter As Integer
    Public Function AddToCounter() As Boolean
      mCounter += 1
      Return True
    End Function
    Public Function GetCounter() As Integer
      Return mCounter
    End Function
    ]]>
</msxsl:script>

    Then you add a call to "customCode:AddToCounter()", and then you could write a message like this <xsl:message><xsl:value-of select="customCode:GetCounter()" /> rows remaining.</xsl:message>

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  • Happy的楠姐
    2020-11-29 10:21

    If you want to know where you are in a for-each loop, you can use the built-in position() function. 

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="/Collection">
        <xsl:for-each select="Content">
            <xsl:if test="position() &lt; 3">
                <!-- Do this for nodes 1, 2 and 3 -->
            </xsl:if>
            <!-- Do this for every node -->
        </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>
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  • 悲哀的现实
    2020-11-29 10:24

    In my case I needed total of boxes in the shipment, this helped

        <xsl:for-each select="ShippingConfirmation/Details/LicensePlates/LicensePlate">
            <xsl:if test="position()=last()">
                <xsl:value-of select="position()"/> 
            </xsl:if>
    </xsl:for-each>
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