error when saving xslt file with parameters - XSLT

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Dennis Aaen 4500 posts 18255 karma points admin hq c-trib

Aug 23, 2010 @ 22:20

Error when saving XSLT-file with parameters

Hey Folks,

I just started my second umbraco and I have run into some problems with my XSLT.

I try to send a parameter, with my XSLT. But when i´m trying to save, my file, I got this error.

Error occured
System.ArgumentNullException: Value cannot be null.
Parameter name: fieldName
at umbraco.library.Item(Int32 nodeId, String fieldName, String displayValue)

I have added this settings in the macro parameters: Alias: PropertyAlias Name: PropertyAlias Type: contentPicker

My XSLT looks like this:

I use the XSLT prototype ReleatedLinks

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [  <!ENTITY nbsp "&#x00A0;">]>
<xsl:stylesheet
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:msxml="urn:schemas-microsoft-com:xslt" 
  xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" 
  exclude-result-prefixes="msxml
 umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes 
Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings 
Exslt.ExsltSets ">


  <xsl:output method="xml" omit-xml-declaration="yes" />

  <xsl:param name="currentPage"/>
  
  <!-- Input the related links property alias here -->
    <xsl:variable name="propertyAlias" select="/macro/propertyAlias"/>
  
  <xsl:template match="/">

    <!-- The fun starts here -->
    <b><xsl:value-of select="johnsen_settings_footer_cases_heading"/></b>
    <ul>
      <xsl:for-each select="$currentPage/* [name() = $propertyAlias and not(@isDoc)]/links/link">
        <li>
          <xsl:element name="a">
            <xsl:if test="./@newwindow = '1'">
              <xsl:attribute name="target">_blank</xsl:attribute>
            </xsl:if>
            <xsl:choose>
              <xsl:when test="./@type = 'external'">
                <xsl:attribute name="href">
                  <xsl:value-of select="./@link"/>
                </xsl:attribute>
              </xsl:when>
              <xsl:otherwise>
                <xsl:attribute name="href">
                  <xsl:value-of select="umbraco.library:NiceUrl(./@link)"/>
                </xsl:attribute>
              </xsl:otherwise>
            </xsl:choose>
            <xsl:value-of select="./@title"/>
          </xsl:element>
        </li>
      </xsl:for-each>
    </ul>

    <!-- Live Editing support for related links. -->
    <xsl:value-of select="umbraco.library:Item($currentPage/@id,$propertyAlias,'')" />

  </xsl:template>

</xsl:stylesheet>

Can not figure out what I'm doing wrong. Hope some of you can help me.

Best regards,

Dennis Aaen

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Chriztian Steinmeier 2800 posts 8790 karma points MVP 8x admin c-trib

Aug 23, 2010 @ 22:59
0
Hi Dennis,

The reason you get this error when saving, is because Umbraco does kind of a test transformation before saving, to test for well-formedness etc. When doing that, there is no document to get the values from, so the call to Item() will fail.

You can do a couple of things to fix it:

1. Check the "Skip errors" box when saving the file

2. Wrap an if statement around that line:
```
<xsl:if test="$propertyAlias">
        ...
</xsl:if>
```
3. If you're not using Canvas mode you can just delete the line, as that's what it's needed for.

/Chriztian
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