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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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The page then repeats the process for continents: else if (isset($continent)) { $sql = 'SELECT * from continent WHERE continentID =' . $continent; $tres = mysql_query($sql) or die(mysql_error()); if (mysql_num_rows($tres) == 0) { $current = $xml->createElement('current', 'Error'); $current = $root->appendChild($current); $error = $xml->createElement('error', 'You appear to have selected an invalid continent'); $error = $root->appendChild($error); } else { $trow = mysql_fetch_array($tres); $continent_name = $trow['continent']; $sql = 'SELECT * FROM country WHERE countryContinentID =' . $continent . ' ORDER BY country'; $cres = mysql_query($sql) or die(mysql_error()); $current = $xml->createElement('current', $continent_name); $current->setAttribute('type', 'continent'); $current->setAttribute('id', $continent); $root->appendChild($current); $items = $xml->createElement('items'); $root->appendChild($items); $linksto = $xml->createElement('linksto', 'country'); $items->appendChild($linksto); while ($crow = mysql_fetch_array($cres)) { $entry = $xml->createElement('entry', $crow['country']); $entry->setAttribute('id', $crow['countryID']); $items->appendChild($entry); } } } If none of the variables has been set, users are at the top level of navigation, and the application must display a list of continents from the database: else { $sql = 'SELECT * FROM continent ORDER BY continent'; $cres = mysql_query($sql) or die(mysql_error()); $current = $xml->createElement('current', 'Home'); $current->setAttribute('type', 'home'); $root->appendChild($current); $items = $xml->createElement('items'); $root->appendChild($items); $linksto = $xml->createElement('linksto', 'continent'); $items->appendChild($linksto); while ($crow = mysql_fetch_array($cres)) {
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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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$entry = $xml->createElement('entry', $crow['continent']); $entry->setAttribute('id', $crow['continentID']); $items->appendChild($entry); } } By the time the script finishes running, it has built an XML document that is transformed in the standard.php script, as you saw earlier.
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nav.xsl
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Let s look at the XSLT stylesheet, nav.xsl in more detail. This stylesheet transforms the XML document from the mk_navxml.php page. The stylesheet starts with an XML declaration and the opening <xsl:stylesheet> element: < xml version="1.0" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> The code creates some XSLT variables to store values that the stylesheet will use: <xsl:variable name="linksto"> <xsl:value-of select="entries/items/linksto"/> </xsl:variable> <xsl:variable name="numLinks"> <xsl:value-of select="count(entries/items/entry)" /> </xsl:variable> It uses the linksto variable to determine the link type, and the numLinks variable to determine whether any links exist. The page uses the <xsl:choose> element to provide some conditional logic. To start with, it identifies errors: <xsl:template match="/"> <xsl:choose> <xsl:when test="//entries/current='Error'"> <h4>Error</h4> <xsl:value-of select="entries/error" /> </xsl:when> When the application has an error, the stylesheet displays it in a level 4 heading. If there is no error, it displays the requested details: <xsl:otherwise> <h4>Current: <xsl:value-of select="entries/current" /></h4> The stylesheet uses another <xsl:choose> element to see if there are any subnavigation links: <xsl:choose> <xsl:when test="$numLinks=0">
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CHAPTER 13 CASE STUDY: USING PHP FOR AN XML APPLICATION
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If there are no links, it displays a message to that effect: There are currently no <strong><xsl:value-of select="$linksto" /> </strong> entries in the database under <xsl:value-of select="entries/current" /> </xsl:when> Otherwise, it displays the links, using the value of the $linksto variable to create the URL: <xsl:otherwise> <p>Please select a <xsl:value-of select="$linksto" />:</p> <xsl:for-each select="entries/items/entry"> <a><xsl:attribute name="href">index.php <xsl:value-of select="$linksto" /> =<xsl:value-of select="@id" /></xsl:attribute><xsl:value-of select="." /> </a><br /> </xsl:for-each> </xsl:otherwise> </xsl:choose> This portion of the template generates XHTML similar to the following: <p>Please select a country:</p> <a href="index.php country=1">Australia</a><br/> <a href="index.php country=2">New Zealand</a><br/> After the stylesheet displays the subnavigation links, it displays a form that allows users to add a new entry at the current level: <p>Add a new <xsl:value-of select="$linksto" />:<br /> <form action="addnew.php" method="POST"> The code needs to pass the level at which you re adding this entry, the id of the parent record, and the current navigation level. It does this using hidden form fields: <xsl:text disable-output-escaping="yes"> <input type="hidden" name="current" value="</xsl:text> <xsl:value-of select="entries/current/@type" /> <xsl:text disable-output-escaping="yes">" /></xsl:text> <xsl:text disable-output-escaping="yes"> <input type="hidden" name="parent" value="</xsl:text> <xsl:value-of select="entries/current/@id" /> <xsl:text disable-output-escaping="yes">" /> </xsl:text> <xsl:text disable-output-escaping="yes"> <input type="hidden" name="into" value="</xsl:text> <xsl:value-of select="$linksto" /> <xsl:text disable-output-escaping="yes">" /> </xsl:text> The current level determines which table receives the new record. The code then inserts the parent id value into the record. The current navigation level redirects users to the current page after inserting the record.
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