id)->SKIPLINKS_ENABLE; } /** * Inserts container for skip links in page layout. */ public static function insertContainer() { if (!self::isEnabled()) { return; } PageLayout::addBodyElements('

'); } /** * Adds a link to the list of skip links. * * @param string $name the displayed name of the links * @param string $url the url of the links * @param integer $position the position of the link in the list * @param boolean $overwriteable false if position is not overwritable by another link */ public static function addLink($name, $url, $position = null, $overwriteable = false) { $position = (!$position || $position < 1) ? count(self::$links) + 100 : (int) $position; $new_link = [ 'name' => $name, 'url' => decodeHTML($url), 'position' => $position, 'overwriteable' => $overwriteable, ]; if (self::checkOverwrite($new_link)) { self::$links[$new_link['url']] = $new_link; } } /** * Adds a link to an anker on the same page to the list of skip links. * * @param string $name the displayed name of the links * @param string $id the id of the anker * @param integer $position the position of the link in the list * @param boolean $overwriteable false if position is not overwritable by another link */ public static function addIndex($name, $id, $position = null, $overwriteable = false) { $url = '#' . $id; self::addLink($name, $url, $position, $overwriteable); } /** * Returns the formatted list of skip links * * @return string the formatted list of skip links */ public static function getHTML() { if (!self::isEnabled() || count(self::$links) === 0) { return ''; } usort(self::$links, function ($a, $b) { return $a['position'] > $b['position']; }); $navigation = new Navigation(''); foreach (self::$links as $index => $link) { $navigation->addSubNavigation( "/skiplinks/link-{$index}", new Navigation($link['name'], $link['url']) ); } return $GLOBALS['template_factory']->render('skiplinks', compact('navigation')); } /** * Checks if there is another link at the same position and if it is overwritable. * * @return boolean true if the link at the same position is overwritable */ private static function checkOverwrite($link) { if (isset(self::$position[$link['position']])) { return false; } if (!$link['overwrite']) { self::$position[$link['position']] = true; } return true; } }