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Summary
The XSLT recommendation provides a means for extending the functionality of style sheets using extension elements and functions. Extension functions behave like built-in XPath functions and can take arguments, and extension elements provide a means for accessing both custom attributes and the context of the request. Both extension elements and functions can be defined using JavaScript. The Xalan-Java 2 XSLT transformation engine defines them, as seen in the final style sheet shown in Listing 11.
Listing 11—The Final Style Sheet
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:lxslt="http://xml.apache.org/xslt"
xmlns:totalSys="TotalSystem"
extension-element-prefixes="totalSys"
version="1.0">
<lxslt:component prefix="totalSys" elements="resetTotal customerInfo"
functions="totalCost getExtPrice">
<lxslt:script lang="javascript">
var orderTotal = 0;
function customerInfo (xslContext, elem) {
thisOrder = xslContext.getContextNode();
thisCustomer = thisOrder.getAttribute("custid");
custInfo = getCustomerInfo(thisCustomer);
return custInfo;
}
function getCustomerInfo(custID) {
if (custID == "969982") {
return "Darling Clementine, Inc., 228 Range Road, Oklahoma City, OK 73101";
} else {
return "Into the Wind, LLC, 849 Research Way, Suite 399, Miami Beach, FL 33109";
}
}
function resetTotal(xslContext, elem) {
resetTo = elem.getAttribute("resetTo");
orderTotal = resetTo;
return null;
}
function getExtPrice (qty, unitPrice) {
extPrice = parseFloat(qty*unitPrice);
orderTotal = parseFloat(orderTotal + extPrice);
return extPrice;
}
function totalCost() {
return orderTotal;
}
</lxslt:script>
</lxslt:component>
<xsl:template match="/">
<html>
<head><title>Order Summaries</title></head>
<body>
<h1>Order Summaries</h1>
<xsl:apply-templates/>
</body>
</html>
</xsl:template>
<xsl:template match="order">
<p><b>Customer Information: </b><totalSys:customerInfo/>
<br /><b>Order number: </b><xsl:value-of select="@orderid"/></p>
<table width="50%" border="1">
<tr>
<th>Product Number</th>
<th>Quantity</th>
<th>Unit Price</th>
<th>Extended Price</th>
</tr>
<totalSys:resetTotal resetTo="0"/>
<xsl:apply-templates select="product"/>
<tr>
<td colspan="3" align="right">Order Total: </td>
<td><xsl:value-of select="totalSys:totalCost()"/></td>
</tr>
</table>
<br /><hr /><br />
</xsl:template>
<xsl:template match="product">
<tr>
<td><xsl:value-of select="@itemid"/></td>
<td><xsl:value-of select="quantity"/></td>
<td><xsl:value-of select="price"/></td>
<td><xsl:value-of select="totalSys:getExtPrice(number(quantity), number(price))"/></td>
</tr>
</xsl:template>
</xsl:stylesheet>
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