[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: A more concise way to handle empty numeric element

Subject: Re: A more concise way to handle empty numeric elements
From: "Andrew Welch" <andrew.j.welch@xxxxxxxxx>
Date: Thu, 7 Jun 2007 14:16:19 +0100
Re:  A more concise way to handle empty numeric element
On 6/7/07, Mark Anderson <mark.anderson@xxxxxxxxxxxxxxxxxxx> wrote:
Hi All

I have to process an XML file that contains a lot of numeric data. Many of the elements that have no value are empty instead of being zero and it may differ for each line, for example

<line id=1>
 <cost1>1000</cost1>
 <cost2>0</cost2> <!-- 0 here, but empty in next line -->
 <cost3></cost3>
</line>
<line id=2>
 <cost1>2000</cost1>
 <cost2></cost2>
 <cost3>3000</cost3>
</line>

I want to do:

<xsl:for-each select="line">
       <xsl:value-of select="format-number(cost1 + cost2 + cost3,'#,###')"/>
 </xsl:for-each>

However, the empty elements will cause "NaN" to be displayed

To fix it I can do:

<xsl:for-each select="line">
<xsl:variable name="cost1">
 <xsl:choose>
 <xsl:when test="(cost1 &gt;= 0)"><xsl:value-of select="cost1"/></xsl:when>
 <xsl:otherwise>0</xsl:otherwise>
 </xsl:choose>
</xsl:variable>
<xsl:variable name="cost2">
 <xsl:choose>
 <xsl:when test="(cost2 &gt;= 0)"><xsl:value-of select="cost2"/></xsl:when>
 <xsl:otherwise>0</xsl:otherwise>
 </xsl:choose>
</xsl:variable>
<xsl:variable name="cost3">
 <xsl:choose>
  <xsl:when test="(cost3 &gt;= 0)"><xsl:value-of select="cost3"/></xsl:when>
 <xsl:otherwise>0</xsl:otherwise>
 </xsl:choose>
</xsl:variable>
       <xsl:value-of select="format-number($cost1 + $cost2 + $cost3,'#,###')"/>
 </xsl:for-each>

However, it seems very long winded. Also the output is HTML, so it makes it hard to read the HTML with so much XML interwoven.

I realized I could write a template to return 0 for each empty element, but the call-template and parameter declaration will add further lines.

Is there a more succinct/elegant way to do it? (it's a shame "number(cost1)" doesn't return 0 for empty elements)

BTW: I'm using XSLT1.0 and can't use any extensions



hmmm it's a bit hacky but you can do:

<xsl:variable name="zero">0</xsl:variable>

<xsl:value-of select="(cost1/text()|$zero)[1] +
(cost2/text()|$zero)[1] + (cost3/text()|$zero)[1]"/>

hopefully someone else will have a better idea...

Current Thread

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.