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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<chapter xml:id="features.xforms" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Dealing with XForms</title>
<para>
<link xlink:href="&url.xforms;">XForms</link> defines a variation on traditional
webforms which allows them to be used on a wider variety of platforms and
browsers or even non-traditional media such as PDF documents.
</para>
<para>
The first key difference in XForms is how the form is sent to the client.
<link xlink:href="&url.xforms.htmlauthors;"><literal>XForms for HTML Authors</literal></link>
contains a detailed description of how to create XForms, for the purpose
of this tutorial we'll only be looking at a simple example.
</para>
<example>
<title>A simple XForms search form</title>
<programlisting role="html">
<![CDATA[
<h:html xmlns:h="http://www.w3.org/1999/xhtml"
xmlns="http://www.w3.org/2002/xforms">
<h:head>
<h:title>Search</h:title>
<model>
<submission action="http://example.com/search"
method="post" id="s"/>
</model>
</h:head>
<h:body>
<h:p>
<input ref="q"><label>Find</label></input>
<submit submission="s"><label>Go</label></submit>
</h:p>
</h:body>
</h:html>
]]>
</programlisting>
</example>
<para>
The above form displays a text input box (named <parameter>q</parameter>),
and a submit button. When the submit button is clicked, the form will be
sent to the page referred to by <literal>action</literal>.
</para>
<para>
Here's where it starts to look different from your web application's point
of view. In a normal HTML form, the data would be sent as
<literal>application/x-www-form-urlencoded</literal>, in the XForms world
however, this information is sent as <acronym>XML</acronym> formatted data.
</para>
<para>
If you're choosing to work with XForms then you probably want that data as
<acronym>XML</acronym>, in that case, look in <varname>$HTTP_RAW_POST_DATA</varname> where
you'll find the <acronym>XML</acronym> document generated by the browser which you can pass
into your favorite <acronym>XSLT</acronym> engine or document parser.
</para>
<para>
If you're not interested in formatting and just want your data to be loaded
into the traditional <varname>$_POST</varname> variable, you can instruct
the client browser to send it as <literal>application/x-www-form-urlencoded</literal>
by changing the <parameter>method</parameter> attribute to
<emphasis>urlencoded-post</emphasis>.
</para>
<example>
<title>Using an XForm to populate <varname>$_POST</varname></title>
<programlisting role="html">
<![CDATA[
<h:html xmlns:h="http://www.w3.org/1999/xhtml"
xmlns="http://www.w3.org/2002/xforms">
<h:head>
<h:title>Search</h:title>
<model>
<submission action="http://example.com/search"
method="urlencoded-post" id="s"/>
</model>
</h:head>
<h:body>
<h:p>
<input ref="q"><label>Find</label></input>
<submit submission="s"><label>Go</label></submit>
</h:p>
</h:body>
</h:html>
]]>
</programlisting>
</example>
<note>
<simpara>
As of this writing, many browsers do not support XForms.
Check your browser version if the above examples fails.
</simpara>
</note>
</chapter>
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