Slide 13.18: AJAX XML: The PHP file

AJAX XML: The PHP File

Course information will be listed here.

The page on the server called by the JavaScript is a PHP file called GetCourse.php as below, which loads an XML document, CourseList.xml, runs a query against the XML file, and returns the result as HTML. When the course query is sent from the JavaScript to the PHP page, the following happens:

PHP creates an XML DOM object.

Find the number element that matches the course number sent from the JavaScript.

Output the course information (send to the txtHint placeholder)

01<?php
02  $q = $_GET["q"]; 
03  $xmlDoc = new DOMDocument( );
04  $xmlDoc->load( "CourseList.xml" );
05  $x = $xmlDoc->getElementsByTagName( 'number' );
06  for ( $i=0; $i<=$x->length-1; $i++ ) {
07    // Process only element nodes.
08    if ( $x->item($i)->nodeType == 1 ) {  // 1: element
09      if ( $x->item($i)->childNodes->item(0)->nodeValue == $q ) {
10        $y = ( $x->item($i)->parentNode );
11      }
12    }
13  }
14  $course = ( $y->childNodes );
15  for ( $i=0; $i<$course->length; $i++ ) {
16    // Process only element nodes.
17    if ( $course->item($i)->nodeType == 1 ) {
18      echo( $course->item($i)->nodeName . ":" );
19      echo( $course->item($i)->childNodes->item(0)->nodeValue );
20    }
21  }
22?>