XSLTProcessor: clearParameters() method

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The clearParameters() method of the XSLTProcessor interface removes all parameters (<xsl:param>) and their values from the stylesheet imported in the processor. The XSLTProcessor will then use the default values specified in the XSLT stylesheet.

Syntax

clearParameters()

Parameters

None.

Return value

None (undefined).

Examples

Using clearParameters()

This example shows how clearParameters() can be used to reset all parameters back to their default values as specified in the XSLT stylesheet.

HTML

html

<div id="result"></div>

JavaScript

const xmlString = `
<items>
  <item>Item 1</item>
  <item>Item 2</item>
  <item>Item 3</item>
</items>
`;

const xsltString = `
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:param name="showItems" select="'yes'"/>
  <xsl:template match="/">
    <!-- If showItems is 'yes', display the list of items -->
    <xsl:if test="$showItems = 'yes'">
      <ul>
        <xsl:for-each select="items/item">
          <li><xsl:value-of select="."/></li>
        </xsl:for-each>
      </ul>
    </xsl:if>
    <!-- If showItems is 'no', display a message -->
    <xsl:if test="$showItems = 'no'">
      <div>No content to show</div>
    </xsl:if>
  </xsl:template>
</xsl:stylesheet>
`;

const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, "application/xml");
const xsltDoc = parser.parseFromString(xsltString, "application/xml");

const xsltProcessor = new XSLTProcessor();
xsltProcessor.importStylesheet(xsltDoc);

// Set the 'showItems' parameter to 'no' and perform the first transformation
xsltProcessor.setParameter(null, "showItems", "no");
let resultFragment = xsltProcessor.transformToFragment(xmlDoc, document);
document.getElementById("result").appendChild(resultFragment);

// Add a horizontal rule to separate the results
document.getElementById("result").appendChild(document.createElement("hr"));

// Clear all parameters, resetting 'showItems' to its default value ('yes')
xsltProcessor.clearParameters();
resultFragment = xsltProcessor.transformToFragment(xmlDoc, document);
document.getElementById("result").appendChild(resultFragment);