XSL FO Pass dynamic value from the HTML to XSLT variable

I have trying to create pdf from html file using FOP. My requirement is, I want to pass variable value at run time. How can I pass variable value at run time?

Solution

It is not clear at what point you can inject "variables" nor how you expect to do them. Here's a sample that may provide some inspiration. It only uses a simple identity-translate and omits all the FO stuff for brevuty.

General principle -- put in a hidden div with some codes that are variables. For instance and simplicity, your input HTML now has this:

<html>
    <div class="variables" style="display:none">
        <div class="var_1" data-value="variable 1 value"/>
        <div class="var_2" data-value="variable 2 value"/>
        <div class="var_3" data-value="variable 3 value"/>
    </div>
    <div>
        <div>Var 1 Value: <span class="variable" data-ref="var_1"/></div>
        <div>Var 2 Value: <span class="variable" data-ref="var_2"/></div>
        <div>Var 3 Value: <span class="variable" data-ref="var_3"/></div>
    </div>
</html>

And you modify your XSL for a template that matches on a span where you want to insert the variable:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:template match="span[@class='variable']">
        <xsl:variable name="lookup">
            <xsl:value-of select="@data-ref"/>
        </xsl:variable>
        <span>
            <xsl:value-of select="//div[@class=$lookup]/@data-value"/>
        </span>
    </xsl:template>
    <xsl:template match="node()">
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:apply-templates/>
        </xsl:copy>
    </xsl:template>
</xsl:stylesheet>

The output of this would be:

<html>
<div class="variables" style="display:none">
  <div class="var_1" data-value="variable 1 value"></div>
  <div class="var_2" data-value="variable 2 value"></div>
  <div class="var_3" data-value="variable 3 value"></div>
</div>
<div>
  <div>Var 1 Value: <span>variable 1 value</span></div>
  <div>Var 2 Value: <span>variable 2 value</span></div>
  <div>Var 3 Value: <span>variable 3 value</span></div>
</div>
</html

Of course, you could expand that to include a template to strip the div whose class is variables for instance to not have it in the output or processed by your templates.