| | 1758 | <section xml:id="xslt.extensions"> |
| | 1759 | <title>XSLT extensions</title> |
| | 1760 | |
| | 1761 | <section xml:id="xslt.extensions.xpathfunctions"> |
| | 1762 | <title>XPath functions</title> |
| | 1763 | <para>In addition to the standard XPath functions supplied by the XSLT/XPath implementation Pustefix provides some additional framework specific |
| | 1764 | XPath functions in the <literal>xmlns:pfx="http://www.schlund.de/pustefix/core"</literal> namespace:</para> |
| | 1765 | <para> |
| | 1766 | <para>Example: |
| | 1767 | <programlisting language="xml"><![CDATA[<ixsl:if test="pfx:isVisible('mypage')=1"> |
| | 1768 | Display if page 'mypage' is accessible |
| | 1769 | </ixsl:test>]]></programlisting> |
| | 1770 | </para> |
| | 1771 | <emphasis role="strong">Function:</emphasis> <emphasis>number</emphasis> <emphasis role="strong">pfx:isVisible</emphasis>(<emphasis>string</emphasis>) |
| | 1772 | </para> |
| | 1773 | <para> |
| | 1774 | The <emphasis role="strong">pfx:isVisible</emphasis> function checks if a page is accessible. The page name is passed as argument. |
| | 1775 | The function returns: |
| | 1776 | <itemizedlist> |
| | 1777 | <listitem><literal>1</literal>, if the page is accessible</listitem> |
| | 1778 | <listitem><literal>0</literal>, if the page isn't accessible</listitem> |
| | 1779 | <listitem><literal>-1</literal>, if the page doesn't exist</listitem> |
| | 1780 | </itemizedlist> |
| | 1781 | </para> |
| | 1782 | <para> |
| | 1783 | <emphasis role="strong">Function:</emphasis> <emphasis>number</emphasis> <emphasis role="strong">pfx:isVisited</emphasis>(<emphasis>string</emphasis>) |
| | 1784 | </para> |
| | 1785 | <para> |
| | 1786 | The <emphasis role="strong">pfx:isVisited</emphasis> function checks if a page has already been visited within the session. The page name is passed as argument. |
| | 1787 | The function returns: |
| | 1788 | <itemizedlist> |
| | 1789 | <listitem><literal>1</literal>, if the page has already been visited</listitem> |
| | 1790 | <listitem><literal>0</literal>, if the page hasn't been visited yet</listitem> |
| | 1791 | <listitem><literal>-1</literal>, if the page isn't configured</listitem> |
| | 1792 | </itemizedlist> |
| | 1793 | </para> |
| | 1794 | <note> |
| | 1795 | <para> |
| | 1796 | You should be aware that doing a boolean check on results of type <literal>number</literal>, <literal>1</literal> and |
| | 1797 | <literal>-1</literal> both are evaluated as <literal>true</literal>, <literal>0</literal> as <literal>false</literal>. |
| | 1798 | </para> |
| | 1799 | </note> |
| | 1800 | </section> |
| | 1801 | </section> |
| | 1802 | |
