How to Import stylesheets in xslt conditionally?

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Is there any way to import stylesheets after checking some conditions?

Like,if the value of variable $a=\"1\" then import 1.xsl or else import 2.xsl.

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轮回少年

2021-01-19 01:06

I know this post is old, but I want to share my opinion.

Each display could use one template instead of two. The value display will be change with a VB application.

breakfast_menu.xml:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="conditionDisplay.xsl" ?>
<data>
    <breakfast_menu>
        <food>
            <name>Belgian Waffles</name>
            <price>$5.95</price>
            <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
            <calories>650</calories>
        </food>

        <food>
            <name>Strawberry Belgian Waffles</name>
            <price>$7.95</price>
            <description>Light Belgian waffles covered with strawberries and whipped cream</description>
            <calories>900</calories>
        </food>


        <food>
            <name>Homestyle Breakfast</name>
            <price>$6.95</price>
            <description>Two eggs, bacon or sausage, toast, and our ever-popular hash browns</description>
            <calories>950</calories>
        </food>
    </breakfast_menu> 
    <display>1</display>
</data>

In this file, I imported my displays and with a condition I tell the template what I need.

conditionDisplay.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
    <xsl:import href="display1.xsl"/>
    <xsl:import href="display2.xsl"/>
    <xsl:template match="/">
        <xsl:variable name="display"><xsl:value-of select= "data/display"/></xsl:variable>
        <xsl:choose>
            <xsl:when test="$display='1'">
                <xsl:call-template name="display1" />
            </xsl:when>
            <xsl:otherwise>
                <xsl:call-template name="display2 />
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
</xsl:stylesheet>

display1.xsl:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template name="display1">
        <html xsl:version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
            <body style="font-family:Arial;font-size:12pt;background-color:#EEEEEE">
                <xsl:for-each select="data/breakfast_menu/food">
                    <div style="background-color:teal;color:white;padding:4px">
                        <span style="font-weight:bold"><xsl:value-of select="name"/> - </span>
                        <xsl:value-of select="price"/>
                    </div>
                    <div style="margin-left:20px;margin-bottom:1em;font-size:10pt">
                        <p>
                            <xsl:value-of select="description"/>
                            <span style="font-style:italic"> (<xsl:value-of select="calories"/> calories per serving)</span>
                        </p>
                    </div>
                </xsl:for-each>
            </body>
        </html>
    </xsl:template>
</xsl:stylesheet>

display2.xsl:

<?xml version="1.0" encoding="UTF-8"?>futur
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template name="display2">
        <html xsl:version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
            <body style="font-family:Arial;font-size:12pt;background-color:#222222">
                <xsl:for-each select="data/breakfast_menu/food">
                    <div style="background-color:teal;color:white;padding:4px">
                        <span style="font-weight:bold"><xsl:value-of select="name"/> - </span>
                        <xsl:value-of select="price"/>
                    </div>
                    <div style="margin-left:20px;margin-bottom:1em;font-size:10pt">
                        <p>
                            <xsl:value-of select="description"/>
                            <span style="font-style:italic"> (<xsl:value-of select="calories"/> calories per serving)</span>
                        </p>
                    </div>
                </xsl:for-each>
            </body>
        </html>
    </xsl:template>
</xsl:stylesheet>

I genuinely apologize for my terrible English. It will be better to the next post and I hope will help someone as I think it's not the best solution.

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有刺的猬

2021-01-19 01:27
Hi All, Is there any way to import stylesheets after checking some conditions?

Like,if the value of variable $a="1" then import 1.xsl or else import 2.xsl.

No, the <xsl:import> directive is only compile-time.

In XSLT 2.0 one can use the use-when attribute for a limited conditional compilation.

For example:
```
<xsl:import href="module-A.xsl" 
     use-when="system-property('xsl:vendor')='vendor-A'"/>
```
The limitations of the use-when attribute are that there is no dynamic context when the attribute is evaluated -- in particular that means that there are no in-scope variables defined.

A non-XSLT solution is to dynamically change the href attribute of the <xsl:import> declaration before the transformation is invoked:
1. Parse the xsl stylesheet as an XML file
2. Evaluate the condition that determines which stylesheet should be imported.
3. Set the value of the href attribute of the <xsl:import> declaration to the URI of the dynamically determined stylesheet-to-be-imported.
4. Invoke the transformation with the in-memory xsl stylesheet that was just modified.
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