Introduction

When you have to display a large number of records, the common practice is to use data paging so the information can be presented in a more user-friendly manner. There are many solutions one can use to implement such a system, and each of them has its own advantages and disadvantages. One of the excellent ways of implementing this solution is using XML and XSL. In this article, I show you how implement this functionality in XSLT. If you want to deep learning or develop applications with XSLT using

one of the programming languages then you have to download one of the free e-books from eLibrary2you.com

Let's start.

Results:

Using the code

There is XML data below:

 version="1.0" encoding="ISO-8859-1"?>

 <data>

   <xdata>

  Any data

 </xdata>

   <total_results count="105"/>   

   <displayCount>20</displayCount>

   <pageNumber>1</pageNumber>

 </data>

To implement paging for the above situation, we need to be able to pass parameters to the stylesheet, and these parameters can be used to specify information such as the number of records to be displayed, the page number to be displayed, as well as the total number of records. Accomplishing this requires the following two steps.

• Declaring parameters in the XSLT stylesheet
• Supplying parameters to the stylesheet

For this example, let us create a new XSLT stylesheet named paging.xsl and the code for the XSLT stylesheet looks like the following. (And the code itself is given below)

<xsl:template name="Page">

 <xsl:param name="pCurrentPageNumber" select="pageNumber"/>

 <xsl:param name="pRecordsPerPage" select="displayCount"/>

 <xsl:param name="pPecordCount" select="total_results/@count"/>

 <xsl:param name="pNextPageNumber"/>

 <xsl:choose>

   <xsl:when test="$pCurrentPageNumber=$pNextPageNumber">

     <li>

       <a class="act" href="#">

         <xsl:value-of select="$pNextPageNumber"/>

       </a>

     </li>

   </xsl:when>

   <xsl:when test="((number($pNextPageNumber)-1)*number($pRecordsPerPage)) <= number($pPecordCount)">

     <li>

       <a>

         <xsl:attribute name="href">

           <xsl:value-of select="concat('?use_jump=',$pCurrentPageNumber,'&jump_first_car_F=',1+((number($pNextPageNumber)-1) * $pRecordsPerPage),'&current_page_this_search_F=',$pNextPageNumber)"/>

         </xsl:attribute>

         <xsl:value-of select="$pNextPageNumber"/>

       </a>

     </li>

   </xsl:when>

 </xsl:choose>

</xsl:template>



<xsl:template name="for.loop">

 <xsl:param name="i"/>

 <xsl:param name="count"/>

 <xsl:param name="currentPage"/>



 <xsl:if test="$i <= $count">

   <xsl:call-template name="Page">

     <xsl:with-param name="pNextPageNumber" select="$i"/>

   </xsl:call-template>

   <xsl:call-template name="for.loop">

     <xsl:with-param name="i" select="$i+1"/>

     <xsl:with-param name="count" select="$count"/>

     <xsl:with-param name="currentPage" select="$currentPage"/>

   </xsl:call-template>

 </xsl:if>

</xsl:template>



<xsl:template name="Paging">

 <xsl:param name="pCurrentPageNumber" select="pageNumber"/>

 <xsl:param name="pRecordsPerPage" select="displayCount"/>

 <xsl:param name="pPecordCount" select="total_results/@count"/>



 <xsl:if test="$pPecordCount > $pRecordsPerPage">



   

   <xsl:if test="$pCurrentPageNumber > 1">

     <li>

       <xsl:variable name="PrePageNumber" select="number($pCurrentPageNumber)-2"/>

       <a>

         <xsl:attribute name="href">

           <xsl:value-of select="concat('?use_jump=',$pCurrentPageNumber,'&jump_first_car_F=', 1+$PrePageNumber*$pRecordsPerPage ,'&current_page_this_search_F=', $PrePageNumber+1 )"/>

         </xsl:attribute>

         Previous <xsl:value-of select="$pRecordsPerPage" />

       </a>

     </li>

   </xsl:if>



   

   <xsl:variable name="pageCount" select="ceiling($pPecordCount div $pRecordsPerPage)"/>

   <xsl:variable name="nrOfPagesToDisplay" select="10"/>

   <xsl:variable name="temp" select="$pCurrentPageNumber+$nrOfPagesToDisplay"/>

   <xsl:variable name="middel" select="ceiling($temp div 2)-1"/>

   <xsl:variable name="start" select="number($middel)-5"/>

   <xsl:choose>

     <xsl:when test="$pCurrentPageNumber > 5 and $start > 5">

       <xsl:call-template name="for.loop">

         <xsl:with-param name="i" select="number($start)-5"/>

         <xsl:with-param name="count" select="($pCurrentPageNumber+$nrOfPagesToDisplay)-1"/>

         <xsl:with-param name="currentPage" select="$pCurrentPageNumber"/>

       </xsl:call-template>

     </xsl:when>

     <xsl:when test="$start=0 or ($pageCount <= $nrOfPagesToDisplay)">

       <xsl:call-template name="for.loop">

         <xsl:with-param name="i" select="1"/>

         <xsl:with-param name="count" select="$nrOfPagesToDisplay"/>

         <xsl:with-param name="currentPage" select="$pCurrentPageNumber"/>

       </xsl:call-template>

     </xsl:when>

     <xsl:otherwise>

       <xsl:call-template name="for.loop">

         <xsl:with-param name="i" select="$start"/>

         <xsl:with-param name="count" select="($start+$nrOfPagesToDisplay)-1"/>

         <xsl:with-param name="currentPage" select="$pCurrentPageNumber"/>

       </xsl:call-template>

     </xsl:otherwise>

   </xsl:choose>

   



   

   

   <xsl:if test="$pageCount > $pCurrentPageNumber">

     <li>

       <a class="end">

         <xsl:attribute name="href">

           <xsl:value-of select="concat('?use_jump=',$pCurrentPageNumber,'&jump_first_car_F=', 1+($pCurrentPageNumber* $pRecordsPerPage) ,'&current_page_this_search_F=',$pCurrentPageNumber+1)"/>

         </xsl:attribute>

         Next <xsl:value-of select="$pRecordsPerPage" />

       </a>

     </li>

   </xsl:if>



 </xsl:if>

</xsl:template>

The template for.loop implement "for(int=0; i<> and the parametrs i is start index and the parametr count is length.

How can use it

In order to use the paging template you only have to call it with parametrs. The pCurrentPageNumber parametr is current page number or selected page number, the pRecordsPerPage parametr is the number of records per page, the pPecordCount parametr is record count. For example:

<xsl:call-template name="Paging">

<xsl:with-param name="pCurrentPageNumber" select="pageNumber"/>

<xsl:with-param name="pRecordsPerPage" select="displayCount"/>

<xsl:with-param name="pPecordCount" select="total_results/@count"/>

</xsl:call-template>