This file is part of ILIAS, a powerful learning management system published by ILIAS open source e-Learning e.V. More...

Collaboration diagram for ilLMContentRendererGUI:

Public Member Functions
	__construct (ilLMPresentationService $service, ilLMPresentationGUI $parent_gui, ilLanguage $lng, ilCtrl $ctrl, ilAccessHandler $access, ilObjUser $user, ilHelpGUI $help, int $requested_obj_id)

	render (int $a_head_foot_page_id=0)

	getLMPageGUI (int $a_id)

	handleCodeParagraph (int $page_id, int $paragraph_id, string $title, string $text)

	renderPreconditionsOfPage ()
	Render preconditions of the page. More...

Data Fields
const	STATUS_ACCESS = 0

const	STATUS_NO_ACCESS = 1

const	STATUS_NO_PUBLIC_ACCESS = 2

const	STATUS_FAILED_PRECONDITIONS = 3

const	STATUS_CORRECT_ANSWER_MISSING = 4

const	STATUS_NO_PAGE_IN_CHAPTER = 5

const	STATUS_DEACTIVATED_PAGE = 6

const	STATUS_NO_PAGE_FOUND = 7

Protected Member Functions
	initHelp ()

	determineStatus ()

	initSearchHighlighting ()

	renderFocusMessage ()

	renderNoPageAccess ()
	Render info message, if page is not accessible in public area. More...

	renderMessageScreen (string $a_content)
	Render message screen. More...

	renderNoPublicAccess ()
	Render info message, if page is not accessible in public area. More...

	renderNavRestrictionDueToQuestions ()
	Render message if navigation to page is not allowed due to unanswered questions. More...

	renderNoPageInChapterMessage ()
	Render no page in chapter message. More...

	renderNoPageFoundMessage ()
	Render no page found message. More...

	renderDeactivatedPageMessage ()

Protected Attributes
ilLMNavigationStatus	$navigation_status

int	$requested_focus_return

int	$requested_obj_id = 0

string	$search_string

int	$focus_id

bool	$deactivated_page

bool	$chapter_has_no_active_page

ilAccessHandler	$access

ilObjUser	$user

ilHelpGUI	$help

int	$current_page = null

ilObjLearningModule	$lm

ilLanguage	$lng

bool	$offline

ilLMTracker	$tracker

ilCtrl	$ctrl

ilLMTree	$lm_tree

ilLMPresentationGUI	$parent_gui

ilSetting	$lm_set

string	$lang

ilLMPresentationLinker	$linker

string	$requested_frame

ilObjectTranslation	$ot

string	$concrete_lang = ""

Detailed Description

This file is part of ILIAS, a powerful learning management system published by ILIAS open source e-Learning e.V.

ILIAS is licensed with the GPL-3.0, see https://www.gnu.org/licenses/gpl-3.0.en.html You should have received a copy of said license along with the source code, too.

If this is not the case or you just want to try ILIAS, you'll find us at: https://www.ilias.de https://github.com/ILIAS-eLearning

Author: Alexander Killing killi.nosp@m.ng@l.nosp@m.eifos.nosp@m..de

Definition at line 22 of file class.ilLMContentRendererGUI.php.

Constructor & Destructor Documentation

◆ __construct()

ilLMContentRendererGUI::__construct	(	ilLMPresentationService	$service,
		ilLMPresentationGUI	$parent_gui,
		ilLanguage	$lng,
		ilCtrl	$ctrl,
		ilAccessHandler	$access,
		ilObjUser	$user,
		ilHelpGUI	$help,
		int	$requested_obj_id
	)

Definition at line 58 of file class.ilLMContentRendererGUI.php.

      {
        $this->access = $access;
        $this->user = $user;
        $this->help = $help;
        $this->ctrl = $ctrl;
        $this->lm_tree = $service->getLMTree();
        $this->lang = $service->getPresentationStatus()->getLang();
        $this->current_page = $service->getNavigationStatus()->getCurrentPage();
        $this->lm = $service->getLearningModule();
        $this->lm_set = $service->getSettings();
        $this->lng = $lng;
        $this->offline = $service->getPresentationStatus()->offline;
        $this->tracker = $service->getTracker();
        $this->linker = $service->getLinker();
        $this->parent_gui = $parent_gui;
        $this->chapter_has_no_active_page = $service->getNavigationStatus()->isChapterWithoutActivePage();
        $this->deactivated_page = $service->getNavigationStatus()->isDeactivatedPage();
        $this->focus_id = $service->getPresentationStatus()->getFocusId();
        $this->concrete_lang = $service->getPresentationStatus()->getConcreteLang();
        $this->search_string = $service->getPresentationStatus()->getSearchString();
        $this->requested_obj_id = $requested_obj_id;
        $this->requested_focus_return = $service->getPresentationStatus()->getFocusReturn();
        $this->requested_frame = $service->getRequest()->getFrame();
        $this->navigation_status = $service->getNavigationStatus();
        $this->ot = ilObjectTranslation::getInstance($this->lm->getId());
    }

References $access, $ctrl, $help, $lng, $parent_gui, $requested_obj_id, $service, $user, ILIAS\Repository\access(), ILIAS\Repository\ctrl(), ilObjectTranslation\getInstance(), ILIAS\Repository\help(), ILIAS\Repository\lng(), and ILIAS\Repository\user().

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Member Function Documentation

◆ determineStatus()

ilLMContentRendererGUI::determineStatus ( )

protected

Definition at line 102 of file class.ilLMContentRendererGUI.php.

                                        : int
    {
        $user = $this->user;
 
        $status = self::STATUS_ACCESS;
        // check page id
        $requested_page_lm = ilLMPage::lookupParentId($this->current_page, "lm");
        if ($requested_page_lm != $this->lm->getId()) {
            $status = self::STATUS_NO_ACCESS;
        }
 
 
        // check if page is (not) visible in public area
        if ($user->getId() == ANONYMOUS_USER_ID &&
            $this->lm->getPublicAccessMode() == 'selected') {
            if (!ilLMObject::_isPagePublic($this->current_page)) {
                $status = self::STATUS_NO_PUBLIC_ACCESS;
            }
        }
 
        // preconditions
        if (!ilObjContentObject::_checkPreconditionsOfPage($this->lm->getRefId(), $this->lm->getId(), $this->current_page)) {
            $status = self::STATUS_FAILED_PRECONDITIONS;
        }
 
        // if navigation is restricted based on correct answered questions
        // check if we have preceeding pages including unsanswered/incorrect answered questions
        if (!$this->offline) {
            if ($this->lm->getRestrictForwardNavigation()) {
                if ($this->tracker->hasPredIncorrectAnswers($this->current_page)) {
                    $status = self::STATUS_CORRECT_ANSWER_MISSING;
                }
            }
        }
 
        // no active page found in chapter
        if ($this->chapter_has_no_active_page &&
            ilLMObject::_lookupType($this->requested_obj_id) == "st") {
            $status = self::STATUS_NO_PAGE_IN_CHAPTER;
        }
 
        if ($this->deactivated_page) {
            $status = self::STATUS_DEACTIVATED_PAGE;
        }
 
        if ($this->current_page == 0) {
            $status = self::STATUS_NO_PAGE_FOUND;
        }
 
        return $status;
    }

References $user, ilObjContentObject\_checkPreconditionsOfPage(), ilLMObject\_isPagePublic(), ilLMObject\_lookupType(), ANONYMOUS_USER_ID, ilObject\getId(), ilPageObject\lookupParentId(), STATUS_ACCESS, STATUS_CORRECT_ANSWER_MISSING, STATUS_DEACTIVATED_PAGE, STATUS_FAILED_PRECONDITIONS, STATUS_NO_ACCESS, STATUS_NO_PAGE_FOUND, STATUS_NO_PAGE_IN_CHAPTER, and STATUS_NO_PUBLIC_ACCESS.

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◆ getLMPageGUI()

ilLMContentRendererGUI::getLMPageGUI ( int $a_id )

Definition at line 299 of file class.ilLMContentRendererGUI.php.

                                           : ilLMPageGUI
    {
        if ($this->lang != "-" && ilPageObject::_exists("lm", $a_id, $this->lang)) {
            $page_gui = new ilLMPageGUI($a_id, 0, false, $this->lang, $this->concrete_lang);
        } else {
            if ($this->lang != "-" && ilPageObject::_exists("lm", $a_id, $this->ot->getFallbackLanguage())) {
                $page_gui = new ilLMPageGUI($a_id, 0, false, $this->ot->getFallbackLanguage(), $this->concrete_lang);
            } else {
                $page_gui = new ilLMPageGUI($a_id, 0, false, "", $this->concrete_lang);
            }
        }
        if ($this->offline) {
            $page_gui->setOutputMode(ilPageObjectGUI::OFFLINE);
        }
        return $page_gui;
    }

References ilPageObject\_exists(), and ilPageObjectGUI\OFFLINE.

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◆ handleCodeParagraph()

ilLMContentRendererGUI::handleCodeParagraph	(	int	$page_id,
		int	$paragraph_id,
		string	$title,
		string	$text
	)

Definition at line 316 of file class.ilLMContentRendererGUI.php.

     : void {
        $directory = $this->parent_gui->getOfflineDirectory() . "/codefiles/" . $page_id . "/" . $paragraph_id;
        ilFileUtils::makeDirParents($directory);
        $file = $directory . "/" . $title;
        if (!($fp = fopen($file, "w+"))) {
            die("<b>Error</b>: Could not open \"" . $file . "\" for writing" .
                " in <b>" . __FILE__ . "</b> on line <b>" . __LINE__ . "</b><br />");
        }
        chmod($file, 0770);
        fwrite($fp, $text);
        fclose($fp);
    }

◆ initHelp()

ilLMContentRendererGUI::initHelp ( )

protected

Definition at line 94 of file class.ilLMContentRendererGUI.php.

                                 : void
    {
        $ilHelp = $this->help;
        $ilHelp->setScreenIdComponent("lm");
        $ilHelp->setScreenId("content");
        $ilHelp->setSubScreenId("content");
    }

References $help, and ilHelpGUI\setScreenIdComponent().

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◆ initSearchHighlighting()

ilLMContentRendererGUI::initSearchHighlighting ( )

protected

Definition at line 154 of file class.ilLMContentRendererGUI.php.

                                               : void
    {
        $user = $this->user;
 
        if ($this->search_string != "" && !$this->offline) {
            $cache = ilUserSearchCache::_getInstance($user->getId());
            $cache->switchSearchType(ilUserSearchCache::LAST_QUERY);
            $search_string = $cache->getQuery();
 
            // advanced search?
            if (is_array($search_string)) {
                $search_string = $search_string["lom_content"];
            }
 
            $p = new ilQueryParser($search_string);
            $p->parse();
 
            $words = $p->getQuotedWords();
            if (is_array($words)) {
                foreach ($words as $w) {
                    ilTextHighlighterGUI::highlight("ilLMPageContent", $w);
                }
            }
        }
    }

References $search_string, $user, ilUserSearchCache\_getInstance(), ilObject\getId(), and ilUserSearchCache\LAST_QUERY.

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◆ render()

ilLMContentRendererGUI::render ( int $a_head_foot_page_id = 0 )

Definition at line 180 of file class.ilLMContentRendererGUI.php.

     : string {
        $ilUser = $this->user;
 
        $head = $foot = "";
 
        $this->initHelp();
 
        switch ($this->determineStatus()) {
            case self::STATUS_NO_ACCESS:
                return $this->renderNoPageAccess();
 
            case self::STATUS_NO_PUBLIC_ACCESS:
                return $this->renderNoPublicAccess();
 
            case self::STATUS_FAILED_PRECONDITIONS:
                return $this->renderPreconditionsOfPage();
 
            case self::STATUS_CORRECT_ANSWER_MISSING:
                return $this->renderNavRestrictionDueToQuestions();
 
            case self::STATUS_NO_PAGE_IN_CHAPTER:
                return $this->renderNoPageInChapterMessage();
 
            case self::STATUS_DEACTIVATED_PAGE:
                return $this->renderDeactivatedPageMessage();
 
            case self::STATUS_NO_PAGE_FOUND:
                return $this->renderNoPageFoundMessage();
 
        }
 
        // page id is e.g. > 0 when footer or header page is processed
        if ($a_head_foot_page_id == 0) {
            $page_id = $this->current_page;
            $this->initSearchHighlighting();
        } else {
            $page_id = $a_head_foot_page_id;
        }
 
        // check if page is out of focus
        $focus_mess = $this->renderFocusMessage();
        $page_object_gui = $this->getLMPageGUI($page_id);
 
        // @todo 6.0 (factor this out (maybe to ilLMPageGUI)
        $this->parent_gui->basicPageGuiInit($page_object_gui);
 
        $page_object = $page_object_gui->getPageObject();
        $page_object->buildDom();
        $page_object->registerOfflineHandler($this);
 
        $page_object_gui->setTemplateOutput(false);
 
        // Update course items
        ilCourseLMHistory::_updateLastAccess($ilUser->getId(), $this->lm->getRefId(), $page_id);
 
        // read link targets
        $page_object_gui->setPageLinker($this->linker);
 
        // get lm page object
        $lm_pg_obj = new ilLMPageObject($this->lm, $page_id);
        $lm_pg_obj->setLMId($this->lm->getId());
 
        // determine target frames for internal links
        $page_object_gui->setLinkFrame($this->requested_frame);
 
        // page title and tracking (not for header or footer page)
        if ($page_id == 0 || ($page_id != $this->lm->getHeaderPage() &&
                $page_id != $this->lm->getFooterPage())) {
            $page_object_gui->setPresentationTitle(
                ilLMPageObject::_getPresentationTitle(
                    $lm_pg_obj->getId(),
                    $this->lm->getPageHeader(),
                    $this->lm->isActiveNumbering(),
                    (bool) $this->lm_set->get("time_scheduled_page_activation"),
                    false,
                    0,
                    $this->lang
                )
            );
 
            // track access
            if ($page_id != 0 && !$this->offline) {
                $this->tracker->trackAccess($page_id, $ilUser->getId());
            }
        } else {
            $page_object_gui->setEnabledPageFocus(false);
            $page_object_gui->getPageConfig()->setEnableSelfAssessment(false);
        }
 
        // ADDED FOR CITATION
        $page_object_gui->setLinkParams("ref_id=" . $this->lm->getRefId());
        $page_object_gui->setTemplateTargetVar("PAGE_CONTENT");
        // @todo 6.0
        //              $page_object_gui->setSourcecodeDownloadScript($this->getSourcecodeDownloadLink());
 
        $ret = $page_object_gui->presentation($page_object_gui->getOutputMode());
 
        // process header
        if ($this->lm->getHeaderPage() > 0 &&
            $page_id != $this->lm->getHeaderPage() &&
            ($page_id == 0 || $page_id != $this->lm->getFooterPage())) {
            if (ilLMObject::_exists($this->lm->getHeaderPage())) {
                $head = $this->render($this->lm->getHeaderPage());
            }
        }
 
        // process footer
        if ($this->lm->getFooterPage() > 0 &&
            $page_id != $this->lm->getFooterPage() &&
            ($page_id == 0 || $page_id != $this->lm->getHeaderPage())) {
            if (ilLMObject::_exists($this->lm->getFooterPage())) {
                $foot = $this->render($this->lm->getFooterPage());
            }
        }
        return $head . $focus_mess . $ret . $foot;
    }

◆ renderDeactivatedPageMessage()

ilLMContentRendererGUI::renderDeactivatedPageMessage ( )

protected

Definition at line 468 of file class.ilLMContentRendererGUI.php.

                                                     : string
    {
        $mtpl = new ilTemplate(
            "tpl.no_content_message.html",
            true,
            true,
            "Modules/LearningModule"
        );
        $m = $this->lng->txt("cont_page_currently_deactivated");
        $act_data = ilLMPage::_lookupActivationData($this->requested_obj_id, $this->lm->getType());
        if ($act_data["show_activation_info"] &&
            (ilUtil::now() < $act_data["activation_start"])) {
            $m .= "<p>" . sprintf(
                $this->lng->txt("cont_page_activation_on"),
                ilDatePresentation::formatDate(
                    new ilDateTime($act_data["activation_start"], IL_CAL_DATETIME)
                )
            ) .
                "</p>";
        }
        $mtpl->setVariable("MESSAGE", $m);
        $mtpl->setVariable(
            "ITEM_TITLE",
            ilLMObject::_lookupTitle($this->requested_obj_id)
        );
        return $mtpl->get();
    }

References ilPageObject\_lookupActivationData(), ilLMObject\_lookupTitle(), ilDatePresentation\formatDate(), IL_CAL_DATETIME, ILIAS\Repository\lng(), and ilUtil\now().

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◆ renderFocusMessage()

ilLMContentRendererGUI::renderFocusMessage ( )

protected

Definition at line 334 of file class.ilLMContentRendererGUI.php.

                                           : string
    {
        $focus_mess = "";
        if ($this->focus_id > 0) {
            $path = $this->lm_tree->getPathId($this->current_page);
 
            // out of focus
            if (!in_array($this->focus_id, $path)) {
                $mtpl = new ilTemplate(
                    "tpl.out_of_focus_message.html",
                    true,
                    true,
                    "Modules/LearningModule"
                );
                $mtpl->setVariable("MESSAGE", $this->lng->txt("cont_out_of_focus_message"));
                $mtpl->setVariable("TXT_SHOW_CONTENT", $this->lng->txt("cont_show_content_after_focus"));
 
                if ($this->requested_focus_return == 0 || ilObject::_lookupType((int) $this->requested_focus_return, true) != "crs") {
                    $mtpl->setVariable("TXT_BACK_BEGINNING", $this->lng->txt("cont_to_focus_beginning"));
                    $this->ctrl->setParameter($this->parent_gui, "obj_id", $this->focus_id);
                    $mtpl->setVariable("LINK_BACK_TO_BEGINNING", $this->ctrl->getLinkTarget($this->parent_gui, "layout"));
                    $this->ctrl->setParameter($this->parent_gui, "obj_id", $this->requested_obj_id);
                } else {
                    $mtpl->setVariable("TXT_BACK_BEGINNING", $this->lng->txt("cont_to_focus_return_crs"));
                    $mtpl->setVariable("LINK_BACK_TO_BEGINNING", ilLink::_getLink($this->requested_focus_return));
                }
 
                $this->ctrl->setParameter($this->parent_gui, "focus_id", null);
                $mtpl->setVariable("LINK_SHOW_CONTENT", $this->ctrl->getLinkTarget($this->parent_gui, "layout"));
                $this->ctrl->setParameter($this->parent_gui, "focus_id", $this->requested_obj_id);
 
                $focus_mess = $mtpl->get();
            } else {
                $succ_page_id = $this->navigation_status->getSuccessorPageId();
                $path2 = array();
                if ($succ_page_id > 0) {
                    $path2 = $this->lm_tree->getPathId($succ_page_id);
                }
                if ($succ_page_id == 0 || !in_array($this->focus_id, $path2)) {
                    $mtpl = new ilTemplate(
                        "tpl.out_of_focus_message.html",
                        true,
                        true,
                        "Modules/LearningModule"
                    );
                    $mtpl->setVariable("MESSAGE", $this->lng->txt("cont_out_of_focus_message_last_page"));
                    $mtpl->setVariable("TXT_SHOW_CONTENT", $this->lng->txt("cont_show_content_after_focus"));
 
                    if ($this->requested_focus_return == 0 || ilObject::_lookupType($this->requested_focus_return, true) != "crs") {
                        $mtpl->setVariable("TXT_BACK_BEGINNING", $this->lng->txt("cont_to_focus_beginning"));
                        $this->ctrl->setParameter($this->parent_gui, "obj_id", $this->focus_id);
                        $mtpl->setVariable("LINK_BACK_TO_BEGINNING", $this->ctrl->getLinkTarget($this->parent_gui, "layout"));
                        $this->ctrl->setParameter($this->parent_gui, "obj_id", $this->requested_obj_id);
                    } else {
                        $mtpl->setVariable("TXT_BACK_BEGINNING", $this->lng->txt("cont_to_focus_return_crs"));
                        $mtpl->setVariable("LINK_BACK_TO_BEGINNING", ilLink::_getLink($this->requested_focus_return));
                    }
 
                    $this->ctrl->setParameter($this->parent_gui, "focus_id", null);
                    $mtpl->setVariable("LINK_SHOW_CONTENT", $this->ctrl->getLinkTarget($this->parent_gui, "layout"));
                    $this->ctrl->setParameter($this->parent_gui, "focus_id", $this->requested_obj_id);
 
                    $focus_mess = $mtpl->get();
                }
            }
        }
        return $focus_mess;
    }

References $path, ilLink\_getLink(), ilObject\_lookupType(), ILIAS\Repository\ctrl(), and ILIAS\Repository\lng().

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◆ renderMessageScreen()

ilLMContentRendererGUI::renderMessageScreen ( string $a_content )

protected

Render message screen.

Definition at line 415 of file class.ilLMContentRendererGUI.php.

                                                             : string
    {
        // content style
        $tpl = new ilTemplate("tpl.page_message_screen.html", true, true, "Modules/LearningModule");
        $tpl->setVariable("TXT_PAGE_NO_PUBLIC_ACCESS", $a_content);
 
        return $tpl->get();
    }

References $tpl.

◆ renderNavRestrictionDueToQuestions()

ilLMContentRendererGUI::renderNavRestrictionDueToQuestions ( )

protected

Render message if navigation to page is not allowed due to unanswered questions.

Definition at line 436 of file class.ilLMContentRendererGUI.php.

                                                           : string
    {
        return $this->renderMessageScreen($this->lng->txt("cont_no_page_access_unansw_q"));
    }

References ILIAS\Repository\lng().

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◆ renderNoPageAccess()

ilLMContentRendererGUI::renderNoPageAccess ( )

protected

Render info message, if page is not accessible in public area.

Definition at line 407 of file class.ilLMContentRendererGUI.php.

                                           : string
    {
        return $this->renderMessageScreen($this->lng->txt("msg_no_page_access"));
    }

References ILIAS\Repository\lng().

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◆ renderNoPageFoundMessage()

ilLMContentRendererGUI::renderNoPageFoundMessage ( )

protected

Render no page found message.

Definition at line 463 of file class.ilLMContentRendererGUI.php.

                                                 : string
    {
        return $this->renderMessageScreen($this->lng->txt("cont_no_page"));
    }

References ILIAS\Repository\lng().

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◆ renderNoPageInChapterMessage()

ilLMContentRendererGUI::renderNoPageInChapterMessage ( )

protected

Render no page in chapter message.

Definition at line 444 of file class.ilLMContentRendererGUI.php.

                                                     : string
    {
        $mtpl = new ilTemplate(
            "tpl.no_content_message.html",
            true,
            true,
            "Modules/LearningModule"
        );
        $mtpl->setVariable("MESSAGE", $this->lng->txt("cont_no_page_in_chapter"));
        $mtpl->setVariable(
            "ITEM_TITLE",
            ilLMObject::_lookupTitle($this->requested_obj_id)
        );
        return $mtpl->get();
    }

References ilLMObject\_lookupTitle(), and ILIAS\Repository\lng().

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◆ renderNoPublicAccess()

ilLMContentRendererGUI::renderNoPublicAccess ( )

protected

Render info message, if page is not accessible in public area.

Definition at line 427 of file class.ilLMContentRendererGUI.php.

                                             : string
    {
        return $this->renderMessageScreen($this->lng->txt("msg_page_no_public_access"));
    }

References ILIAS\Repository\lng().

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◆ renderPreconditionsOfPage()

ilLMContentRendererGUI::renderPreconditionsOfPage ( )

Render preconditions of the page.

Definition at line 500 of file class.ilLMContentRendererGUI.php.

                                               : string
    {
        $succ_node = "";
        $conds = ilObjContentObject::_getMissingPreconditionsOfPage($this->lm->getRefId(), $this->lm->getId(), $this->current_page);
        $topchap = ilObjContentObject::_getMissingPreconditionsTopChapter($this->lm->getRefId(), $this->lm->getId(), $this->current_page);
 
        $ptpl = new ilTemplate("tpl.page_preconditions.html", true, true, "Modules/LearningModule");
 
        // list all missing preconditions
        foreach ($conds as $cond) {
            $obj_link = ilLink::_getLink($cond["trigger_ref_id"]);
            $ptpl->setCurrentBlock("condition");
            $ptpl->setVariable("VAL_ITEM", ilObject::_lookupTitle($cond["trigger_obj_id"]));
            $ptpl->setVariable("LINK_ITEM", $obj_link);
            if ($cond["operator"] == "passed") {
                $cond_str = $this->lng->txt("passed");
            } else {
                $cond_str = $this->lng->txt("condition_" . $cond["operator"]);
            }
            $ptpl->setVariable("VAL_CONDITION", $cond_str . " " . $cond["value"]);
            $ptpl->parseCurrentBlock();
        }
 
        $ptpl->setVariable(
            "TXT_MISSING_PRECONDITIONS",
            sprintf(
                $this->lng->txt("cont_missing_preconditions"),
                ilLMObject::_lookupTitle($topchap)
            )
        );
        $ptpl->setVariable("TXT_ITEM", $this->lng->txt("object"));
        $ptpl->setVariable("TXT_CONDITION", $this->lng->txt("condition"));
 
        // output skip chapter link
        $parent = $this->lm_tree->getParentId($topchap);
        $childs = $this->lm_tree->getChildsByType($parent, "st");
        $j = -2;
        $i = 1;
        foreach ($childs as $child) {
            if ($child["child"] == $topchap) {
                $j = $i;
            }
            if ($i++ == ($j + 1)) {
                $succ_node = $this->lm_tree->fetchSuccessorNode($child["child"], "pg");
            }
        }
        if ($succ_node != "") {
            $link = "<br /><a href=\"" .
                $this->linker->getLink("layout", $succ_node["obj_id"], $this->requested_frame) .
                "\">" . $this->lng->txt("cont_skip_chapter") . "</a>";
            $ptpl->setVariable("LINK_SKIP_CHAPTER", $link);
        }
 
        return $ptpl->get();
    }