Strange XSLT problem...

dakkar · May 25th, 2005, 10:43 AM

I've a weird problem with a XSLT file...

my XSLT translates a XML file into a HTML form and, to solve some problems, I found a solution: to give to each "input" tag a name that is a concatenation of the xml tags to reach that element (much like an xpath)

I managed to obtain this using param and variable...

I'm applying that transformation with a small java program and if I run it from the console... it works. The resulting form is ok and the "input" tag names are "correct" (like: "book:chapter:para:")

But when I run it from a servlet of my webapp, it runs... but the tag names of the resulting forms are not correct, but they miss all the "path" part, so they are like: "para:"

Anybody can help me? I've tryed a lot of alternatives, but they didn't work... :_(

mhkay · May 25th, 2005, 10:58 AM

Debugging other people's code is made considerably easier if they show you the code.

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

dakkar · May 25th, 2005, 11:12 AM

ok :) thank you!

here the xslt:

Code:

<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsl:output method="html" />

    <xsl:template match="/">
        <xsl:apply-templates select="/xsd:schema/xsd:element" />
    </xsl:template>

    <xsl:template match="xsd:element" name="elemento">
        <xsl:param name="predec" select="" />
        <xsl:value-of select="@name" /><br/>
        <input name="{$predec}" type="text"  class="fieldNormal" onBlur="fValid(this, 'string', this.value, 0, 0);"  onFocus="fFocus(this);"/><xsl:value-of select="@type" /><br/>
    </xsl:template>

    <xsl:template match="xsd:complexType/xsd:sequence">
        <xsl:param name="predec" select="" />
        <xsl:apply-templates>
            <xsl:with-param name="predec" select="concat($predec,@name,':')" />
        </xsl:apply-templates>
    </xsl:template>

    <xsl:template match="xsd:element">
        <xsl:param name="predec" select="" />
        <xsl:choose>
            <xsl:when test="contains(@type, ':')">
                <xsl:choose>
                    <xsl:when test="boolean(@maxOccurs)">
                        <div id="{@name}" class="blockstyle">    
                            <xsl:call-template name="elemento">
                                <xsl:with-param name="predec" select="concat($predec,@name,':')" />
                            </xsl:call-template>
                        <input value="-" type="image" src="images/dels.gif" style="vertical-align:middle;" class="delButt" onclick="cutFields(this);" />
                        </div>
                        <span id="w{@name}">
                            <img name="+" src="images/adds.gif" style="vertical-align:middle;" onClick="moreFields('{@name}');" /><span class="recNameBut">[<xsl:value-of select="@name"/>]</span>
                        </span>
                        <br />
                    </xsl:when>
                    <xsl:otherwise>
                        <xsl:call-template name="elemento">
                            <xsl:with-param name="predec" select="concat($predec,@name,':')" />
                        </xsl:call-template>
                    </xsl:otherwise>
                </xsl:choose>                
            </xsl:when>
            <xsl:otherwise>
            <fieldset class="field">
                <legend class="recName"><xsl:value-of select="@name"/></legend>
                <xsl:choose>
                    <xsl:when test="boolean(@maxOccurs)">
                        <div id="{@name}" class="blockstyle">    
                    <xsl:variable name="myType" select="@type" />
                    <xsl:apply-templates select="/xsd:schema/xsd:complexType[@name=$myType]">
                        <xsl:with-param name="predec" select="concat($predec,@name,':')" />
                    </xsl:apply-templates><br/>
                        <input value="-" type="image" src="images/dels.gif" style="vertical-align:middle;" class="delButt" onclick="cutFields(this);" />
                        </div>
                        <span id="w{@name}">
                            <img name="+" src="images/adds.gif" style="vertical-align:middle;" onClick="moreFields('{@name}');" /><span class="recNameBut">[<xsl:value-of select="@name"/>]</span>
                        </span>
                        <br />
                    </xsl:when>
                    <xsl:otherwise>
                <xsl:variable name="myType" select="@type" />
                    <xsl:apply-templates select="/xsd:schema/xsd:complexType[@name=$myType]">
                        <xsl:with-param name="predec" select="concat($predec,@name,':')" />
                    </xsl:apply-templates>
                    </xsl:otherwise>
                </xsl:choose>    
            </fieldset>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>

</xsl:stylesheet>

dakkar · May 25th, 2005, 11:15 AM

...and this is the source (a XSD file):

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="libro" type="Tlibro"/>
    <xsd:complexType name="Tlibro">
        <xsd:sequence>
            <xsd:element name="fronte" type="Tfronte"/>
            <xsd:element name="corpo" type="Tcorpo"/>
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="Tfronte">
        <xsd:sequence>
            <xsd:element name="titololibro" type="xsd:string"/>
            <xsd:element name="autore" type="xsd:string"/>
            <xsd:element name="editore" type="xsd:string"/>
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="Tcorpo">
        <xsd:sequence>
            <xsd:element name="capitolo" type="Tcap" maxOccurs="unbounded" />
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="Tcap">
        <xsd:sequence>
            <xsd:element name="titolo" type="xsd:string"/>
            <xsd:element name="para" type="Tpara" maxOccurs="unbounded" />
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="Tpara">
        <xsd:sequence>
            <xsd:element name="p" type="xsd:string" maxOccurs="unbounded" />
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>

mhkay · May 26th, 2005, 04:23 AM

I don't know why you're getting different results in the two environments, but two observations:

(a) you have two template rules with match="xsd:element". This is an error. The processor
is allowed to report the error, or it's allowed to use the template that comes last. It's
unwise to rely on this behaviour, I would start by fixing this problem.

(b) you have the line

<xsl:param name="predec" select="" />

The select attribute is required to be an XPath expression, and "" isn't, so this is an error
that every XSLT processor ought to report. If it's getting this wrong, then heaven only knows
what else it is getting wrong. Which XSLT processor are you using? [Subtext: there are better
ones available...]

Michael Kay
http://www.saxonica.com/

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

dakkar · May 26th, 2005, 06:37 AM

Xalan (last version)

well... ok...

Could you give me a tip to "construct" a form element name attribute, like:

<input name="document:title:para" .../>

Because I need it to solve a problem on field names... I use as names the schema names, but within the schema I can have elements with the same name (like a book "title" and a chapter "title") and I'd like to avoid confusion!

I'm in this need:
I generate a html form from a schema, then I must use that form to add,modify and view records of a simple xml-file (used as database).
Now I've problems with:
1) - schema elements with the same name (like the "title" example above)
2) - populating the form, for the "modify" function... I can overwrite a certain "record", but I'm not able to refill the fields as a real Modify need to do...

For the (1) problem I thought of those Xpath-like naming for the form fields... Can be a nice solution? there are better ones?

For the (2) problem I've thought to put a JSP function called in the value of each field... but it's really complex use it for all the cases...) I can extract a given "record" (xml fragment that can fill a form)... but there are better ways to populate my form?

Thank you in advance for your time!