[xep-support] Configuring XEP for Embedded JavaScript Functionality

Alexander Peshkov peshkov at renderx.com
Fri Feb 28 00:54:19 PST 2003

Hello Todd,

Actually it's not an XSL FO or XEP question. You try to use some XSLT
extension which seems to be unsupported by SAXON, the XSLT processor
we use. I suppose you have some other XSLT engine; if it has a JAXP
interface, you can plug it in instead of SAXON by adding the
appropriate jar to CLASSPATH instead of (or before) saxon.jar. You may
also need to set "javax.xml.transform.TransformerFactory" system
property to point to a specific class in your XSLT engine. 

Best regards,
Alexander Peshkov                             mailto:peshkov at renderx.com

PT> Hello,

PT> I'm a newbie to XEP and (truthfully) to Java, so please bear with me if
PT> these are stupid questions...

PT> I'm using the trial version 3.2.1 and have created a relatively simple
PT> XSL-FO stylesheet to processes my XML document.  All is going well, I'm able
PT> to get a PDF generated and am starting to make formatting changes.  One of
PT> the changes requires trying to use an embedded Javascript function to do
PT> some more complicated checking of the DOM.  I've searched for examples on
PT> the web where this is done, and I believe I'm doing everything correctly,
PT> but I get an error message when I try to build the PDF, I get the following
PT> error:

PT> "The URI http://www.doejs.com/ does not identify an external Java class"

PT> Of course, I just made up this namespace, but the examples I've seen seem to
PT> do the same thing -- again, I'm not a Java guy so I may be doing something
PT> really obviously wrong.

PT> Without sending a whole lot of code, 

PT> Here's a test XSL that demonstrates the error... The error only occurs when
PT> I actually try to call the javascript function (if I comment out the call,
PT> the PDF is generated fine):

PT> <?xml version="1.0" encoding="UTF-8"?>
PT> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
PT>                  xmlns:fo="http://www.w3.org/1999/XSL/Format" 
PT>                  xmlns:lxslt="http://xml.apache.org/xslt"
PT>                  xmlns:doejs="http://www.doejs.com/"
PT>                  extension-element-prefixes="doejs"
PT>                   version="1.0">

PT> <lxslt:component prefix="doejs" functions="getResult">
PT>         <lxslt:script lang="javascript">
PT>                 function getResult() {
PT>                         return '123';
PT>                 }
PT>         </lxslt:script>
PT> </lxslt:component>

PT> <xsl:template match="intro-chapter">
PT>         <fo:block font-size="20pt">
PT>                 <xsl:value-of select="doejs:getResult()"/>
PT>                 <xsl:value-of select="456"/>
PT>         </fo:block>
PT> </xsl:template>

PT> </xsl:stylesheet>

PT> *************************************

PT> Also, because I don't know any better, here's the command line I'm using to
PT> build the PDF.  I've seen reference to making sure the BSF.jar and JS.jar
PT> files are in the classpath, but am not sure I've done this correctly.

PT> java -classpath "C:\Program Files\XEP\lib\xep321_trial.jar;C:\Program
PT> Files\XEP\lib\cryptix32.jar;C:\Program
PT> Files\XEP\lib\cryptix32-pgp.jar;C:\Program
PT> Files\XEP\lib\saxon.jar;C:\Program Files\XEP\lib\xt.jar;C:\Program
PT> Files\XEP\lib\bsf.jar;C:\Program Files\XEP\lib\js.jar;"
PT> com.renderx.xep.JAXPDriver -Dcom.renderx.xep.ROOT="C:\Program Files\XEP"
PT> -xml "c:\cgpubsys\guides\test\xml\hmd.xml" -xsl "c:\program
PT> files\softquad\xmetal 3\fop\cgstandard01_fo.xsl" -out testx.pdf

PT> Most of the classpath is taken directly out of the transform.bat file, with
PT> the paths to BSF and JS tacked on at the end.  I realize that if XEP is
PT> adopted here, I'll have to become much more versed in Java, but this is just
PT> supposed to be a proof-of-concept effort and any help would be greatly
PT> appreciated.

PT> Regards,
PT> Todd Powell
PT> US Dept of Energy

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