SAX Example Code Page 30

The next function endElement() defines the HTML to display when the closing tag is encountered:

      function endElement($parser, $name) 

      {

          global $currentTag;

          # output closing HTML tags

          switch ($name) {

          case "Travelpackage":

              echo("<tr><td colspan=\"2\"><hr></td></tr>\n");

              break;

 

          default:

              echo("</td></tr>\n");

              break;

          }

          # clear current tag variable

          $currentTag = "";

          $currentAttribs = "";

      }

Once we decide how each element should be displayed, it becomes easy to decide what HTML should be put in the different case statements. In this example we're using the closing </Travelpackage> tag, as the 'seperator tag' and displaying a horizontal line to the browser. If there isn't a need to associate HTML with a tag, leave the case empty.

The function characterData() is used to process the data between the start and end tags. In the travel.xml document, most elements contain data. For example, <City>Cayo Coco</City>, where Cayo Coco is the data. Now we add HTML to the data $data:

      # process data between tags

      function characterData($parser, $data) 

      {

          global $currentTag;

          # add HTML tags to the values

          switch ($currentTag) {

          case "Country_name":

              echo("<a href=\"#\">$data</a>\n");

              break;

          default:

              echo($data);

              break;

          }

      }

As the parser moves through the XML document it comes across elements. For example, the parser looks at the element <Travelpackage name="a"> and matches the element name with the appropriate case in the switch block. In this instance, the data should be displayed as a row in the table with a single cell containing the name and the value of each attribute within the <Travelpackage> tag. So, <tr><td>$key: $value</td></tr> is displayed.

The case statements for <Recordset> and <Package> are empty. Therefore, nothing will be displayed when the parser sees these tags. The default case displays <tr><td>$name</td><td> where $name is the name of the current element, like <City> or <Resort>. We could create a separate case for every element in the XML document, or use one common tag for all elements.

Now let us define what the XML will look like when it is parsed and displayed by the browser. It could display a list, in which case the default case would look something like:

default:

    echo("<li>$name</li>\n");

    break;

The next function endElement() defines the HTML to display when the closing tag is encountered:

      function endElement($parser, $name) 

      {

          global $currentTag;

          # output closing HTML tags

          switch ($name) {

          case "Travelpackage":

              echo("<tr><td colspan=\"2\"><hr></td></tr>\n");

              break;

 

          default:

              echo("</td></tr>\n");

              break;

          }

          # clear current tag variable

          $currentTag = "";

          $currentAttribs = "";

      }

SAX Example Code Page 29
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SAX Example Code Page 31