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topics.scriptlets.xml

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Oliver Hinckel edited this page Aug 17, 2012 · 2 revisions

WEB Application

The simple `scriptlet.HttpScriptlet` class can be used to process HTTP requests by writing the HTML output directly to the response.

Instead of writing the content directly to the response, the scriptlet.xml.XMLScriptlet can be used, to build a XML tree which is transformed using a XSL file to generate the HTML output.

The XMLScriptlet class

The scriptlet.xml.XMLScriptlet class is derived from the scriptlet.HttpScriptlet class and provides additional functionality for processing HTTP requests.

Basically the behaviour is the same. The difference between the two classes is, that the XMLScriptlet is working with a XML tree and a XSL file, which is used to do the transformation (XSLT).

A simple implementation looks like this:

<?php
  uses('scriptlet.xml.XMLScriptlet');

  class MyScriptlet extends XMLScriptlet {

    public function doGet($request, $response) {
      $response->addFormResult(new Node('class', $this->getClassName());
      $response->addFormResult(new Node('name', $request->getParam('name'));

     return parent::doGet($request, $response);
   }

   public function _setStylesheet($request, $response) {
     $response->setStylesheet('welcome.xsl');
   }
 }
?>

Additionally to this you need to create a XSL file (here welcome.xsl) to do the transformation with the XML tree (build by using the response object and XMLScriptletResponse::addFormResult()):

<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet
 version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:func="http://exslt.org/functions"
>
  <xsl:template match="/">
    <html>
      <head><title>Hello World scriptlet (<xsl:value-of select="/formresult/title"/>)</title></head>
      <body>
        <h1>Hello <xsl:value-of select="/formresult/name"/></h1>
      </body>
    </html>
  </xsl:template>
</xsl:stylesheet>

The doGet() function is adding some nodes to the response XML tree, which results in a XML tree like this:

<formresult>
  <title>package.MyScriptlet</title>
  <name>Foo Bar</name>
</formresult>

It adds a node "title" which contains the FQCN of the scriptlet class, and a node "name" which contains the name passed as GET parameter "name".

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