encoding in xslt

IAMMRBONGO 29 posts 49 karma points

May 19, 2011 @ 16:54

Hi all,
Me yet again. I was wondering if anyone knew how to get umbraco to set the encoding when generating an XML file. I'm trying to output a feed from a template which calls it's own alternative template to provide it XML for an ajax feed (It's a picture library and I only want to pre-load a certain number of images at a time similar to flickr).

I've got to get the xml file formatted as I want it using XML (it needs to be lightweight and follow a specific structure). What I've got is an alt template which I can in AJAX.

The problem I have is that I keep setting the XML:output encoding to utf-8 which is then ignored by the output. Code below (Any ideas, I never quite get encoding right):

<?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" xmlns:umbraco.contour="urn:umbraco.contour" 
  exclude-result-prefixes="msxml
 umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes 
Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings 
Exslt.ExsltSets umbraco.contour ">


<xsl:output method="xml" omit-xml-declaration="no" encoding="UTF-8"/>

<xsl:param name="currentPage"/>
<xsl:variable name="thumbWidth" select="number(90)" />
<xsl:variable name="thumbHeight" select="number(90)" />
<xsl:variable name="maxWidth" select="number(600)" />

<xsl:template match="/">
<PictureLibrary>
  
  
  <xsl:for-each select="$currentPage/GalleryImage">
        <xsl:variable name="mediaFolderId" select="$currentPage/mediaLibraryID" />
        <!-- Set a variable to the image ID To see if it exists in the media library -->
        <xsl:variable name="imageId" select="galleryImage"/>
        <!-- Set a second variable to the image caption -->
        <xsl:variable name="caption" select="galleryCaption"/>
        <!-- Loop through the media library to find the image -->
        <xsl:for-each select="umbraco.library:GetMedia($mediaFolderId, true())/Image">
        <!-- check that the umbraco file was found -->

          <xsl:if test="umbracoFile != ''">
            <!-- Match the 2 for loops on image ID -->
            <xsl:if test="@id = $imageId">
                <xsl:element name="pic">
                  <xsl:attribute name="title"><xsl:value-of select="$caption"/></xsl:attribute>
                  <xsl:attribute name="tPAdd"><![CDATA[/imageGen.ashx?image=]]><xsl:value-of select="umbraco.library:UrlEncode(umbracoFile)"/>&amp;width=<xsl:value-of select="$thumbWidth"/>&amp;height=<xsl:value-of select="$thumbHeight"/></xsl:attribute>
                  <xsl:attribute name="lPAdd"><![CDATA[/imageGen.ashx?image=]]><xsl:value-of select="umbraco.library:UrlEncode(umbracoFile)"/><![CDATA[&width=]]><xsl:value-of select="$maxWidth"/><![CDATA[&Constrain=True]]></xsl:attribute>
                  <xsl:attribute name="fPAdd"><xsl:value-of select="umbraco.library:UrlEncode(umbracoFile)"/></xsl:attribute>
                </xsl:element>            
            </xsl:if>
          </xsl:if>
        </xsl:for-each>
  </xsl:for-each>  
  
  



</PictureLibrary>
</xsl:template>

</xsl:stylesheet>

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IAMMRBONGO 29 posts 49 karma points

May 19, 2011 @ 17:11

It looks like the main problem may be that it places a single whitespace character before the xml declaration and also a blank line. I have no idea where they are coming through and the encoding is not registering as UTF-8.

I tried removing the following but it made no difference:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>

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IAMMRBONGO 29 posts 49 karma points

May 19, 2011 @ 17:20

Got rid of the leading space. It was in the template file. Still need to work out where the extra line is from though

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

May 19, 2011 @ 21:32

Hi IAMMRBONGO,

You should set omit-xml-declaration to "yes" and silently ignore the output encoding issue - here's why:

- The way the transformation is carried out, results in always getting the output XMLString as UTF-16; that's just how it works in the .NET classes that handle that.

In the template you should not have any linebreaks inside the <asp:Content> tag, before the <umbraco:macro> tag - something like this:

<asp:Content ContentPlaceHolderID="ContentPlaceHolderDefault" runat="server"><% Response.ContentType = "text/xml"; %><?xml version="1.0"?><umbraco:macro runat="server" ...>

Note that we set the ContentType to "text/xml"; the XML declaration isn't mandatory, but if you leave it in, don't specify the encoding - it really should be handled automatically...

This always works for me - BUT: The other half of doing encoding right with XML, is to actually save files (that includes XSLT files) in the encoding they say they are (which is almost always UTF-8).

/Chriztian

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Jan Skovgaard 11280 posts 23678 karma points MVP 11x admin c-trib

May 19, 2011 @ 23:50

Hi IAMMRBONGO (and Chriztian)

I just want to add a tip...

If you don't want to use the ASP.NET stuff for setting the ContentType you could use the "ChangeContentType" extension in your xslt file instead. Like this

<xsl:value-of select="umbraco.library:ChangeContentType('text/xml')"/>

You can place it anywhere in your <xsl:template match="/"></xsl:template>

/Jan

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IAMMRBONGO 29 posts 49 karma points

May 20, 2011 @ 12:04

I'd high five you but I don't have the karma points. Someone give these guys a high five

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Encoding in XSLT