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how to increment counter varable

madhusudhan

Hi,

how to increment counter variable in xslt

please send me reply asap.

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vpatel

XSL is NOT a programming language; rather it is a stylesheet. Native XSL variables are single assignment and done. I have used XML / XSL (and few of its pre-decessors -- SGML anybody) quite extensively and most of the time, with a little creativity, you can achieve whatever you want even with this limitation. If you absolutely must have a counter then there are some external "plug-ins/extensions" (JavaScript-like scripting or Java extension) that you can use to get whatever you need. I usually see a true need to achieve a variable counter via one of those mechanism once in a LONG while.

In any case, what is your use case for having a counter?

HTH!

nipper

XSL is NOT a programming language; rather it is a stylesheet. Native XSL variables are single assignment and done. I have used XML / XSL (and few of its pre-decessors -- SGML anybody) quite extensively and most of the time, with a little creativity, you can achieve whatever you want even with this limitation. If you absolutely must have a counter then there are some external "plug-ins/extensions" (JavaScript-like scripting or Java extension) that you can use to get whatever you need. I usually see a true need to achieve a variable counter via one of those mechanism once in a LONG while.

In any case, what is your use case for having a counter?

HTH!

I think this post illustrates the significant issues one faces with moving from TPLs to XSLT. Counters are used quite often in templates, you have a list of 10 containers, you want a separator between them but not before the 1st or after the last, thus you need 9. Or you take these 10 containers and put them, odd number in the left column and even in the right again matching that divs and tables are closed properly. All of these are easy in TPLs.

I know my examples were for forms and not SP, but this was a good thread to hijack. Smiley Very Happy

VP have you seen any good docs on IWOV XSLT ? Any way of adding perl ?

CRB

I think this post illustrates the significant issues one faces with moving from TPLs to XSLT. Counters are used quite often in templates, you have a list of 10 containers, you want a separator between them but not before the 1st or after the last, thus you need 9. Or you take these 10 containers and put them, odd number in the left column and even in the right again matching that divs and tables are closed properly. All of these are easy in TPLs.

i know what you mean Andy, most of the time there is no direct way to achieve what you need. but as VP mentioned with little creativity ( many extra lines of code) you can do almost everything in XSLT that you do with TPLs. for your example of counter, a combination of conditional statments, position(), last() and for loops would get you what you need. the other crazy thing is the scope of variables in xsl template. you usually end up having to define 10s of variable names that do almost the same thing instead of reusing the same name in different scopes.

VP have you seen any good docs on IWOV XSLT ? Any way of adding perl ?

i find these to be very helpful:
http://www.zvon.org/xxl/XSLTreference/Output/index.html
http://www.caucho.com/resin/doc/xslt-fun.xtp
http://www.informit.com/articles/article.aspx?p=26881

and this is great article about things you can't do with xsl (the first thing i check before i start thinking about stuff): http://www.dpawson.co.uk/xsl/sect2/nono.html#d1967e22

vpatel

VP have you seen any good docs on IWOV XSLT ? Any way of adding perl ?

Just to be super clear: there is no such thing as IWOV XSLT. With XSL PT, AUTN IWOV moved away from proprietary version of perl/TPLs to industry standard XSL -- so there is no proprietary XSLT.

With that said, can we add perl in XSL? Probably - I am not sure. Even if it was possible I wouldn't do it that way. My personal preference would be to use Java Extension mechanism as there is a lot of industry support for that. While Perl with XSL is almost unheard of. Ping me offline and we can discuss.

Furthermore, lets take couple of those use cases that you described and I can tell you that you can achieve all of that without any Java Extensions or any external programs. I am sure there are use cases where you need external programs but the use cases you just mentioned can be achieved purely in XSL.

1. "You have a list of 10 containers, you want a separator between them but not before the 1st or after the last, thus you need 9." Here is the psuedo code -- exact syntax maybe off just "slightly" as I am not actually testing this as I type:


...
<xsl:apply-templates select="containers"/>
...
<xsl:template match="containers">

  Whatever other content that goes in this container.

  <xsl:if test="position() != last()">
    put your separator here.
  </xsl:if>

</xsl:template>

NOTE: This will output each container content followed by a separator except 
for a separator after the last container content.

2. Alternating your containers into left & right table columns:


<table>
  <xsl:apply-templates select="containers"/>
</table>

...

<xsl:template match="containers">
    <xsl:choose>
      <xsl:when test="position() mod 2 = 0">      
 <td>      
  right column content
 </td>
 <xsl:text disable-output-escaping="yes">&lt;/tr&gt;</xsl:text>
        </xsl:when>
        <xsltherwise>  
            <xsl:text disable-output-escaping="yes">&lt;tr&gt;</xsl:text>
 <td>        
  left column content
 </td>   
        </xsltherwise>  
     </xsl:choose> 
  </xsl:template>

Good XSL References:
1. http://msdn2.microsoft.com/en-us/library/ms256177.aspx -- one of the better things to come out of MS :-)
2. http://www.mulberrytech.com/xsl/xsl-list
3. http://www.dpawson.co.uk/xsl/sect2/sect21.html

I use # 1 as my primary resource whenever I need to. Link # 2 is like a tech list for posting questions. I haven't posted in a few years now so I am not sure if it is still up and running. Link # 3 covers a lot of the basics and some advanced scenarios as well.

HTH!

nipper

I use # 1 as my primary resource whenever I need to. Link # 2 is like a tech list for posting questions. I haven't posted in a few years now so I am not sure if it is still up and running. Link # 3 covers a lot of the basics and some advanced scenarios as well.

HTH!

This helps a great deal. Thanks VP.