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CHAPTER 7 ADVANCED CLIENT-SIDE XSLT TECHNIQUES
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The doTransform() function uses the transformNode() method of the XML parser to apply an XSLT transformation. The code passes the xsl variable to this method to specify which stylesheet to use. After the transformation, the code displays the results in the innerHTML of the sortoutput (<div>) element.
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Note Because the transformation is applied using JavaScript and the XML parser, planets10.xml
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doesn t need to include a stylesheet reference to planets10.xsl. However, I ve included the reference within the XML document so you can test the transformation in a browser.
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The XHTML page includes three buttons that you can click to sort the table. Clicking a button calls the orderBy() function. Each button passes the sort criteria in the function call. This includes the sorted element, as well as the type of sort to apply: <input type="button" onClick="orderBy('@name', 'text');" value="Order by name" /> <input type="button" onClick="orderBy('positionFromSun/text()', 'number');" value="Order by position from the sun" /> <input type="button" onClick="orderBy('substring-before(meanTemp/text(), \'C\')', 'number');" value="Order by mean temp" /> The orderBy() function follows: function orderBy(select, dataType) { xsl = loadDocumentIE(xslfile); var sortItem = xsl.getElementsByTagName("xsl:sort")[0]; sortItem.setAttribute("select", select); sortItem.setAttribute("data-type", dataType); doTransform(); } The orderBy() function receives the element to sort on and its data type as parameters. The code uses these parameters to modify the XSLT stylesheet dynamically. When you click a button, the orderBy()function reloads planets10.xsl. This is required because IE makes the loaded stylesheet read-only after applying the transformation. Reloading the document allows the JavaScript to read the XSLT stylesheet again. The code identifies the <xsl:sort> element in the stylesheet by using the getElementsByTagName() method: var sortItem = xsl.getElementsByTagName("xsl:sort")[0]; This method returns any <xsl:sort> elements in the document. The code selects the first element by specifying index 0. The code then sets the values of the select and datatype attributes of the <xsl:sort> element to those passed into the function. When you click the second button <input type="button" onClick="orderBy('positionFromSun/text()', 'number')" value="Order by position from the sun" />
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CHAPTER 7 ADVANCED CLIENT-SIDE XSLT TECHNIQUES
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the code dynamically alters the <xsl:sort> element as follows: <xsl:apply-templates> <xsl:sort select="positionFromSun/text()" data-type="number" order="ascending"/> </xsl:apply-templates> Finally, the code calls doTransform() to apply the altered transformation and update the sortoutput (<div>) element. In this example, Document Object Model (DOM) scripting manipulates the elements in the stylesheet. This example touched briefly on the subject, and I ll explain it more fully in the next two chapters. In this XHTML page, JavaScript rewrote a portion of the stylesheet dynamically. You could totally rewrite the stylesheet using this method.
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Caution If you have Windows XP with Service Pack 2 installed, you will run into security problems if you
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try to use this method to access XML files located in a different domain from the web page.
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If you ve worked as a web developer for some time, you probably remember the days of version 3 and 4 browsers. At that time, the HTML standard wasn t consistently applied between Netscape and IE. Each browser manufacturer added nonstandard HTML tags, and there were differences in the application of existing standards. The result was that some sites had to be written in two versions one for Netscape and one for IE. Because of this, the XSLT specification defines a standard method of extending XSLT using extension functions and extension elements. In this example, you ll see how to create extension functions to display specific text in uppercase. I won t examine extension elements, as Microsoft XML Parser (MSXML) 3 doesn t support them. However, you could use an extension element to change the value of a variable while the stylesheet is loading. You can use extension functions to write specific functionality. These functions are written in languages other than XSLT and are best suited to tasks such as text manipulation and disk access. They are particularly useful for quarantined environments such as intranets, where you can rely on a standard operating environment and web browser. Although most server-side processors support extension functions, only IE supports client-side extension functions. This example only works in IE and not the Mozilla-based browsers. In this example, I ll create JavaScript extension functions to work with the text in the <description> element. The example will capitalize the planet s name wherever it appears in the description. This is the same type of technique that you could use to highlight search terms within search results. Unlike XSLT, JavaScript supports regular expressions. This allows you to specify any case for the planet s name. This example uses the resource files planets11.xml and planets11.xsl. The new stylesheet follows. I ll explain it in detail shortly:
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