> doesn't seem to work in xslt

samjudson · October 22nd, 2008, 04:22 AM

One thing that is missing from all your posts is any examples of what your input XML looks like.

If you don't have much time to get to know Saxon etc then I'd recommend Kernow. Its a simple GUI application that comes with saxon preconfigured - just point it at your XML file and XSLT file and tell it to go!

http://kernowforsaxon.sourceforge.net/

/- Sam Judson : Wrox Technical Editor -/

mhkay · October 22nd, 2008, 04:27 AM

I think you are hitting a processor bug. I'm very reluctant to suggest that without evidence, which is why I have been pushing you to run it under a different processor, or at least under a different browser, which would provide that evidence. But if you're not prepared to follow the diagnostic strategy that I suggest, then I'm not sure I can help you.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

trufla · October 22nd, 2008, 04:29 AM

I think I may have an idea about what is causing the issue and I am slightly perturbed as I am not sure how to fix this.

Going back to my orginal example but with a bit more code I get a different output:

Code:

<xsl:param name="amount"/>
<xsl:param name="from"/>
<xsl:param name="to"/>

<xsl:template match="/currencies/currencyComparison">
<xsl:choose>
<xsl:when test="$from='21'"> 
<xsl:if test="$to=6">

  <xsl:variable name="Price1">
    <xsl:choose>  
      <xsl:when test="Provider='No1' and Naming='Pounds'">
        <xsl:value-of select='format-number($amount * currencyRate, "#.000")'/> 
       </xsl:when>
       <xsl:otherwise>
       </xsl:otherwise>
    </xsl:choose> 
</xsl:variable>


<xsl:variable name="Price2">
<xsl:choose>  
  <xsl:when test="Provider='B' and Naming='Pounds'">
      <xsl:value-of select='format-number($amount * currencyRate, "#.000")' /> 
  </xsl:when>
  <xsl:otherwise>
  </xsl:otherwise>
</xsl:choose> 
</xsl:variable>


<xsl:value-of select='format-number($Price2 * 2 , "#.000")'/>

</xsl:if>
</xsl:when> 

<xsl:otherwise>
</xsl:otherwise>
</xsl:choose>
</xsl:template>

The output is:

Code:

NaNNaNNaNNaN1.895NaNNaNNaN

Is the comparision on the two variables not working because when looped through one variable maybe empty at the time? Is there a way to avoid this?

samjudson · October 22nd, 2008, 04:37 AM

As I said, it depends a lot on what your input XML looks like - without that we can't possibly say what is going on.

/- Sam Judson : Wrox Technical Editor -/

trufla · October 22nd, 2008, 04:42 AM

[code]

Code:

<currencies>

<currency>
    <ID>21</ID>
    <BuyValue>1</BuyValue>
    <SellValue>1</SellValue>
<currency/>

<currency>
    <ID>6</ID>
    <BuyValue>2.095</BuyValue>
    <SellValue>1.937</SellValue>
<currency/>

<currencyComparison>
    <Naming>Pounds</Naming>
    <Rate>1.8834</Rate>
    <Provider>A</Provider>
</currencyComparison>

<currencyComparison>
    <Naming>Pounds</Naming>
    <Rate>1.8439</Rate>
    <Provider>B</Provider>
</currencyComparison>

</currencies>

samjudson · October 22nd, 2008, 04:50 AM

Well inside your template you're never going to have $Price1 and $Price2 defined at the same time, because they are in different places.

Try the following:

Code:

<xsl:template match="currencies">
  <xsl:variable name="Price1" select="currentComparision[Naming='Pounds' and Provider='A']/Rate"/>
  <xsl:variable name="Price2" select="currentComparision[Naming='Pounds' and Provider='B']/Rate"/>
  Price 1 * Price 2 = <xsl:value-of select="$Price1 * $Price2"/>
</xsl:template>

/- Sam Judson : Wrox Technical Editor -/

trufla · October 22nd, 2008, 04:53 AM

Sorry, this is it in full:

Code:

<currencies>

<currency>
<ID>21</ID>
<BuyValue>1</BuyValue>
<SellValue>1</SellValue>
</currency>

<currency>
<ID>6</ID>
<BuyValue>2.095</BuyValue>
<SellValue>1.937</SellValue>
</currency>

<currency>
<ID>10</ID>
<BuyValue>1.322</BuyValue>
<SellValue>1.222</SellValue>
</currency>

<currency>
<ID>2</ID>
<BuyValue>2.187</BuyValue>
<SellValue>1.994</SellValue>
</currency>

<currency>
<ID>5</ID>
<Country>CAN</Country>
<BuyValue>2.135</BuyValue>
<SellValue>1.947</SellValue>
</currency>

<currency>
<ID>13</ID>
<BuyValue>30.918</BuyValue>
<SellValue>27.915</SellValue>
</currency>

<currency>
<ID>14</ID>
<BuyValue>10.001</BuyValue>
<SellValue>9.117</SellValue>
</currency>

<currency>
<ID>1</ID>
<BuyValue>227.266</BuyValue>
<SellValue>206.694</SellValue>
</currency>

<currency>
<ID>15</ID>
<BuyValue>2.786</BuyValue>
<SellValue>2.54</SellValue>
</currency>

<currency>
<ID>19</ID>
<BuyValue>4.332</BuyValue>
<SellValue>3.784</SellValue>
</currency>

<currency>
<ID>16</ID>
<BuyValue>10.791</BuyValue>
<SellValue>9.837</SellValue>
</currency>

<currency>
<ID>17</ID>
<BuyValue>16.048</BuyValue>
<SellValue>14.419</SellValue>
</currency>

<currency>
<ID>18</ID>
<BuyValue>12.674</BuyValue>
<SellValue>11.554</SellValue>
</currency>

<currency>
<ID>4</ID>
<BuyValue>2.17</BuyValue>
<SellValue>1.978</SellValue>
</currency>

<currency>
<ID>20</ID>
<BuyValue>2.585</BuyValue>
<SellValue>2.296</SellValue>
</currency>

<currency>
<ID>12</ID>
<BuyValue>7.803</BuyValue>
<SellValue>7.079</SellValue>
</currency>

<currency>
<ID>11</ID>
<BuyValue>2.634</BuyValue>
<SellValue>2.301</SellValue>
</currency>

<currencyComparison>
<Naming>Pounds</Naming>
<Rate>1.8811</Rate>
<Provider>A</Provider>
</currencyComparison>

<currencyComparison>
<Naming>Pounds</Naming>
<Rate>1.895</Rate>
<Provider>B</Provider>
</currencyComparison>

<currencyComparison>
<Naming>Pounds</Naming>
<Rate>1.8834</Rate>
<Provider>C</Provider>
</currencyComparison>

<currencyComparison>
<Naming>Pounds</Naming>
<Rate>1.8439</Rate>
<Provider>D</Provider>
</currencyComparison>


</currencies>

mhkay · October 22nd, 2008, 04:55 AM

Yes, the way you are setting up the variables, if the <xsl:otherwise> branch is taken then the value of the variable will be "", which format-number() converts to NaN, which will in turn give you NaN when you do the multiplication. This isn't consistent with the information you originally gave us, that both $Price1 and $Price2 were numeric - that's why I asked for a complete sample so I could verify your statements.

It seems to me there's some flaw in your logic. You only compute a price under certain conditions, and then you compare prices even if those conditions aren't true.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

trufla · October 22nd, 2008, 05:09 AM

Ha ha!

I am still getting my head around xslt - clearly I am finding the navigating of nodes tricky for processing in the way I would ordinarily do it in PHP for example.

Thanks Sam, you are a genius! That has been driving me mad for ages!