Survey execution graphical output. More...

Collaboration diagram for ilSurveyExecutionGUI:

Public Member Functions
	ilSurveyExecutionGUI ($a_object)
	ilSurveyExecutionGUI constructor
&	executeCommand ()
	execute command
	getCommand ($cmd)
	Retrieves the ilCtrl command.
	resume ()
	Resumes the survey.
	start ($resume=false)
	Starts the survey.
	redirectQuestion ()
	Called when a user answered a page to perform a redirect after POST.
	previous ()
	Navigates to the previous pages.
	next ()
	Navigates to the next pages.
	gotoPage ()
	Go to a specific page without saving.
	outSurveyPage ($activepage=NULL, $direction=NULL)
	Output of the active survey question to the screen.
	saveUserInput ($navigationDirection="next")
	Save the user's input.
	navigate ($navigationDirection="next")
	Survey navigation.
	saveActiveQuestionData (&$data)
	Saves the users input of the active page.
	cancel ()
	Called on cancel.
	runShowFinishedPage ()
	Creates the finished page for a running survey.
	exitSurvey ()
	Exits the survey after finishing it.
	outNavigationButtons ($navigationblock="top", $page)
	Creates the navigation buttons for a survey.
	preview ()

Data Fields
	$object
	$lng
	$tpl
	$ctrl
	$ilias
	$tree
	$preview

Detailed Description

Survey execution graphical output.

The ilSurveyExecutionGUI class creates the execution output for the ilObjSurveyGUI class. This saves some heap space because the ilObjSurveyGUI class will be smaller.

Author: Helmut Schottmüller helmu.nosp@m.t.sc.nosp@m.hottm.nosp@m.uell.nosp@m.er@ma.nosp@m.c.co.nosp@m.m

Version

Id:: class.ilSurveyExecutionGUI.php 42205 2013-05-15 09:13:07Z jluetzen

Definition at line 37 of file class.ilSurveyExecutionGUI.php.

Member Function Documentation

ilSurveyExecutionGUI::cancel ( )

Called on cancel.

Called on cancel

private

Definition at line 649 of file class.ilSurveyExecutionGUI.php.

        {
                $this->ctrl->redirectByClass("ilobjsurveygui", "infoScreen");
        }

& ilSurveyExecutionGUI::executeCommand ( )

execute command

Definition at line 75 of file class.ilSurveyExecutionGUI.php.

References $_GET, $cmd, $ret, and getCommand().

        {
                $cmd = $this->ctrl->getCmd();
                $next_class = $this->ctrl->getNextClass($this);
                $cmd = $this->getCommand($cmd);
                if (strlen($cmd) == 0)
                {
                        $this->ctrl->setParameter($this, "qid", $_GET["qid"]);
                        $this->ctrl->redirect($this, "gotoPage");
                }
                switch($next_class)
                {
                        default:
                                $ret =& $this->$cmd();
                                break;
                }
                return $ret;
        }

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ilSurveyExecutionGUI::exitSurvey ( )

Exits the survey after finishing it.

Exits the survey after finishing it

public

Definition at line 684 of file class.ilSurveyExecutionGUI.php.

References $_REQUEST, and preview().

        {
                if(!$this->preview)
                {
                        $this->ctrl->redirectByClass("ilobjsurveygui", "backToRepository");
                }
                else
                {
                        $this->ctrl->setParameterByClass("ilobjsurveygui", "pgov", $_REQUEST["pgov"]);
                        $this->ctrl->redirectByClass("ilobjsurveygui", "questions");
                }
        }

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ilSurveyExecutionGUI::getCommand ( $cmd )

Retrieves the ilCtrl command.

Retrieves the ilCtrl command

public

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

References $cmd.

Referenced by executeCommand().

        {
                return $cmd;
        }

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ilSurveyExecutionGUI::gotoPage ( )

Go to a specific page without saving.

private

Definition at line 281 of file class.ilSurveyExecutionGUI.php.

References $_GET.

        {
                $this->ctrl->setParameter($this, "activecommand", "gotoPage");
                $this->ctrl->setParameter($this, "qid", $_GET["qid"]);
                $this->ctrl->setParameter($this, "direction", "0");
                $this->ctrl->redirect($this, "redirectQuestion");
        }

ilSurveyExecutionGUI::ilSurveyExecutionGUI ( $a_object )

ilSurveyExecutionGUI constructor

The constructor takes possible arguments an creates an instance of the ilSurveyExecutionGUI object.

Parameters

object $a_object Associated ilObjSurvey class public

Definition at line 55 of file class.ilSurveyExecutionGUI.php.

References $_REQUEST, $ilCtrl, $ilias, $lng, $tpl, $tree, and preview().

  {
                global $lng, $tpl, $ilCtrl, $ilias, $tree;
                $this->lng =& $lng;
                $this->tpl =& $tpl;
                $this->ctrl =& $ilCtrl;
                $this->ilias =& $ilias;
                $this->object =& $a_object;
                $this->tree =& $tree;
                // stay in preview mode
                $this->preview = (bool)$_REQUEST["prvw"];
                $this->ctrl->saveParameter($this, "prvw");
                $this->ctrl->saveParameter($this, "pgov");
        }

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ilSurveyExecutionGUI::navigate ( $navigationDirection = "next" )

Survey navigation.

Survey navigation

private

Definition at line 537 of file class.ilSurveyExecutionGUI.php.

References $_GET, $_SESSION, $data, $ilUser, outSurveyPage(), saveActiveQuestionData(), and ilUtil\sendFailure().

        {
                global $ilUser;
                global $rbacsystem;
                if (!$rbacsystem->checkAccess("read", $this->object->ref_id)) 
                {
                        // only with read access it is possible to run the test
                        $this->ilias->raiseError($this->lng->txt("cannot_read_survey"),$this->ilias->error_obj->MESSAGE);
                }
                // check users input when it is a metric question
                unset($_SESSION["svy_errors"]);
                $page_error = 0;
                $page = $this->object->getNextPage($_GET["qid"], 0);
                foreach ($page as $data)
                {
                        $page_error += $this->saveActiveQuestionData($data);
                }
                if ($page_error && (strcmp($navigationDirection, "previous") != 0))
                {
                        if ($page_error == 1)
                        {
                                ilUtil::sendFailure($this->lng->txt("svy_page_error"));
                        }
                        else
                        {
                                ilUtil::sendFailure($this->lng->txt("svy_page_errors"));
                        }
                }
                else
                {
                        $page_error = "";
                        unset($_SESSION["svy_errors"]);
                }
                $direction = 0;
                switch ($navigationDirection)
                {
                        case "next":
                        default:
                                $activepage = $_GET["qid"];
                                if (!$page_error)
                                {
                                        $direction = 1;
                                }
                                break;
                        case "previous":
                                $activepage = $_GET["qid"];
                                if (!$page_error)
                                {
                                        $direction = -1;
                                }
                                break;
                }
                $this->outSurveyPage($activepage, $direction);
        }

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ilSurveyExecutionGUI::next ( )

Navigates to the next pages.

private

Definition at line 260 of file class.ilSurveyExecutionGUI.php.

References $_GET, $result, and saveUserInput().

        {
                $result = $this->saveUserInput("next");
                $this->ctrl->setParameter($this, "activecommand", "next");
                $this->ctrl->setParameter($this, "qid", $_GET["qid"]);
                if (strlen($result))
                {
                        $this->ctrl->setParameter($this, "direction", "0");
                }
                else
                {
                        $this->ctrl->setParameter($this, "direction", "1");
                }
                $this->ctrl->redirect($this, "redirectQuestion");
        }

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ilSurveyExecutionGUI::outNavigationButtons	(	$navigationblock = `"top"`,
		$page
	)

Creates the navigation buttons for a survey.

Creates the navigation buttons for a survey. Runs twice to generate a top and a bottom navigation to ease the use of long forms.

public

Definition at line 706 of file class.ilSurveyExecutionGUI.php.

Referenced by outSurveyPage().

        {
                $prevpage = $this->object->getNextPage($page[0]["question_id"], -1);
                $this->tpl->setCurrentBlock($navigationblock . "_prev");
                if ($prevpage === 0)
                {
                        $this->tpl->setVariable("BTN_PREV", $this->lng->txt("survey_start"));
                }
                else
                {
                        $this->tpl->setVariable("BTN_PREV", $this->lng->txt("survey_previous"));
                }
                $this->tpl->parseCurrentBlock();
                $nextpage = $this->object->getNextPage($page[0]["question_id"], 1);
                $this->tpl->setCurrentBlock($navigationblock . "_next");
                if ($nextpage === 1)
                {
                        $this->tpl->setVariable("BTN_NEXT", $this->lng->txt("survey_finish"));
                }
                else
                {
                        $this->tpl->setVariable("BTN_NEXT", $this->lng->txt("survey_next"));
                }
                $this->tpl->parseCurrentBlock();
        }

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ilSurveyExecutionGUI::outSurveyPage	(	$activepage = `NULL`,
		$direction = `NULL`
	)

Output of the active survey question to the screen.

Output of the active survey question to the screen

private

Definition at line 296 of file class.ilSurveyExecutionGUI.php.

References $_REQUEST, $_SESSION, $data, $error_messages, $ilUser, ilUtil\getImagePath(), outNavigationButtons(), preview(), runShowFinishedPage(), and ilUtil\sendInfo().

Referenced by navigate(), preview(), and redirectQuestion().

        {
                global $ilUser,$rbacsystem;
                if(!$this->preview)
                {
                        // security check if someone tries to go into a survey using an URL to one of the questions
                        $canStart = $this->object->canStartSurvey($_SESSION["anonymous_id"][$this->object->getId()]);
                        if (!$canStart["result"])
                        {
                                ilUtil::sendInfo(implode("<br />", $canStart["messages"]), TRUE);
                                $this->ctrl->redirectByClass("ilobjsurveygui", "infoScreen");
                        }
                        $survey_started = $this->object->isSurveyStarted($ilUser->getId(), $_SESSION["anonymous_id"][$this->object->getId()]);
                        if ($survey_started === FALSE)
                        {
                                ilUtil::sendInfo($this->lng->txt("survey_use_start_button"), TRUE);
                                $this->ctrl->redirectByClass("ilobjsurveygui", "infoScreen");
                        }
                }
                else if (!$rbacsystem->checkAccess("write", $this->object->ref_id))
                {
                        // only with write access it is possible to preview the survey
                        $this->ilias->raiseError($this->lng->txt("survey_cannot_preview_survey"),$this->ilias->error_obj->MESSAGE);
                }
                $page = $this->object->getNextPage($activepage, $direction);
                $constraint_true = 0;
                // check for constraints
                if (count($page[0]["constraints"]))
                {
                        while (is_array($page) and ($constraint_true == 0) and (count($page[0]["constraints"])))
                        {
                                $constraint_true = ($page[0]['constraints'][0]['conjunction'] == 0) ? true : false;
                                foreach ($page[0]["constraints"] as $constraint)
                                {
                                        if(!$this->preview)
                                        {                                       
                                                $working_data = $this->object->loadWorkingData($constraint["question"], $_SESSION["finished_id"][$this->object->getId()]);
                                        }
                                        else
                                        {
                                                $working_data = $_SESSION["preview_data"][$this->object->getId()][$constraint["question"]];
                                        }
                                        if ($constraint['conjunction'] == 0)
                                        {
                                                // and
                                                $constraint_true = $constraint_true & $this->object->checkConstraint($constraint, $working_data);
                                        }
                                        else
                                        {
                                                // or
                                                $constraint_true = $constraint_true | $this->object->checkConstraint($constraint, $working_data);
                                        }
                                }
                                if ($constraint_true == 0)
                                {
                                        // #11047 - we are skipping the page, so we have to get rid of existing answers for that question(s)
                                        foreach($page as $page_question)
                                        {
                                                $qid = $page_question["question_id"];                                   
                                                                                                
                                                // see saveActiveQuestionData()
                                                if(!$this->preview)
                                                {                                                       
                                                        $this->object->deleteWorkingData($qid, $_SESSION["finished_id"][$this->object->getId()]);
                                                }
                                                else
                                                {
                                                        $_SESSION["preview_data"][$this->object->getId()][$qid] = null;
                                                }
                                        }
                                        
                                        $page = $this->object->getNextPage($page[0]["question_id"], $direction);
                                }
                        }
                }
                $first_question = -1;
                if ($page === 0)
                {
                        $this->ctrl->redirectByClass("ilobjsurveygui", "infoScreen");
                }
                else if ($page === 1)
                {
                        $this->object->finishSurvey($ilUser->id, $_SESSION["anonymous_id"][$this->object->getId()]);
                        if (array_key_exists("anonymous_id", $_SESSION)) unset($_SESSION["anonymous_id"][$this->object->getId()]);
                        $this->runShowFinishedPage();
                        return;
                }
                else
                {
                        $required = false;
                        $this->tpl->addBlockFile("ADM_CONTENT", "adm_content", "tpl.il_svy_svy_content.html", "Modules/Survey");
                        if (!($this->object->getAnonymize() && $this->object->isAccessibleWithoutCode() && ($_SESSION["AccountId"] == ANONYMOUS_USER_ID)))
                        {
                                $this->tpl->setCurrentBlock("suspend_survey");
                                if(!$this->preview)
                                {
                                        $this->tpl->setVariable("TEXT_SUSPEND", $this->lng->txt("cancel_survey"));
                                        $this->tpl->setVariable("HREF_SUSPEND", $this->ctrl->getLinkTargetByClass("ilObjSurveyGUI", "infoScreen"));
                                        $this->tpl->setVariable("HREF_IMG_SUSPEND", $this->ctrl->getLinkTargetByClass("ilObjSurveyGUI", "infoScreen"));
                                }
                                else
                                {
                                        $this->ctrl->setParameterByClass("ilObjSurveyGUI", "pgov", $_REQUEST["pgov"]);
                                        $this->tpl->setVariable("TEXT_SUSPEND", $this->lng->txt("survey_cancel_preview"));
                                        $this->tpl->setVariable("HREF_SUSPEND", $this->ctrl->getLinkTargetByClass("ilObjSurveyGUI", "questions"));
                                        $this->tpl->setVariable("HREF_IMG_SUSPEND", $this->ctrl->getLinkTargetByClass("ilObjSurveyGUI", "questions"));
                                }
                                
                                $this->tpl->setVariable("ALT_IMG_SUSPEND", $this->lng->txt("cancel_survey"));
                                $this->tpl->setVariable("TITLE_IMG_SUSPEND", $this->lng->txt("cancel_survey"));
                                $this->tpl->setVariable("IMG_SUSPEND", ilUtil::getImagePath("cancel.png"));
                                $this->tpl->parseCurrentBlock();
                        }
                        $this->outNavigationButtons("top", $page);
                        $this->tpl->setCurrentBlock("percentage");
                        $percentage = (int)(($page[0]["position"])*100);
                        $this->tpl->setVariable("PERCENT_BAR_START", ilUtil::getImagePath("bar_start.png"));
                        $this->tpl->setVariable("PERCENT_BAR_FILLED", ilUtil::getImagePath("bar_filled.png"));
                        $this->tpl->setVariable("PERCENT_BAR_EMPTY", ilUtil::getImagePath("bar_empty.png"));
                        $this->tpl->setVariable("PERCENT_BAR_END", ilUtil::getImagePath("bar_end.png"));
                        $this->tpl->setVariable("PERCENTAGE_ALT", $this->lng->txt("percentage"));
                        $this->tpl->setVariable("PERCENTAGE_VALUE", $percentage);
                        $this->tpl->setVariable("PERCENTAGE_UNFINISHED", 100-$percentage);
                        $this->tpl->parseCurrentBlock();
                        if (count($page) > 1 && $page[0]["questionblock_show_blocktitle"])
                        {
                                $this->tpl->setCurrentBlock("questionblock_title");
                                $this->tpl->setVariable("TEXT_QUESTIONBLOCK_TITLE", $page[0]["questionblock_title"]);
                                $this->tpl->parseCurrentBlock();
                        }
                        foreach ($page as $data)
                        {
                                $this->tpl->setCurrentBlock("survey_content");
                                if ($data["heading"])
                                {
                                        $this->tpl->setVariable("QUESTION_HEADING", $data["heading"]);
                                }
                                if ($first_question == -1) $first_question = $data["question_id"];
                                $question_gui = $this->object->getQuestionGUI($data["type_tag"], $data["question_id"]);
                                if (is_array($_SESSION["svy_errors"]))
                                {
                                        $working_data =& $question_gui->object->getWorkingDataFromUserInput($_SESSION["postdata"]);
                                }
                                else
                                {
                                        $working_data = $this->object->loadWorkingData($data["question_id"], $_SESSION["finished_id"][$this->object->getId()]);
                                }
                                $question_gui->object->setObligatory($data["obligatory"]);
                                $error_messages = array();
                                if (is_array($_SESSION["svy_errors"]))
                                {
                                        $error_messages = $_SESSION["svy_errors"];
                                }
                                $show_questiontext = ($data["questionblock_show_questiontext"]) ? 1 : 0;
                                $question_output = $question_gui->getWorkingForm($working_data, $this->object->getShowQuestionTitles(), $show_questiontext, $error_messages[$data["question_id"]], $this->object->getSurveyId());
                                $this->tpl->setVariable("QUESTION_OUTPUT", $question_output);
                                $this->ctrl->setParameter($this, "qid", $data["question_id"]);
                                $this->tpl->parse("survey_content");
                                if ($data["obligatory"]) $required = true;
                        }
                        if ($required)
                        {
                                $this->tpl->setCurrentBlock("required");
                                $this->tpl->setVariable("TEXT_REQUIRED", $this->lng->txt("required_field"));
                                $this->tpl->parseCurrentBlock();
                        }
                        $this->outNavigationButtons("bottom", $page);
                        $this->tpl->setVariable("FORM_ACTION", $this->ctrl->getFormAction($this, "redirectQuestion"));
                }
                if(!$this->preview)
                {
                        $this->object->setPage($_SESSION["finished_id"][$this->object->getId()], $page[0]['question_id']);
                        $this->object->setStartTime($_SESSION["finished_id"][$this->object->getId()], $first_question);
                }
        }

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ilSurveyExecutionGUI::preview ( )

Definition at line 732 of file class.ilSurveyExecutionGUI.php.

References outSurveyPage().

Referenced by exitSurvey(), ilSurveyExecutionGUI(), outSurveyPage(), saveActiveQuestionData(), saveUserInput(), and start().

        {
                $this->outSurveyPage();
        }

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ilSurveyExecutionGUI::previous ( )

Navigates to the previous pages.

Navigates to the previous pages

private

Definition at line 239 of file class.ilSurveyExecutionGUI.php.

References $_GET, $result, and saveUserInput().

        {
                $result = $this->saveUserInput("previous");
                $this->ctrl->setParameter($this, "activecommand", "previous");
                $this->ctrl->setParameter($this, "qid", $_GET["qid"]);
                if (strlen($result))
                {
                        $this->ctrl->setParameter($this, "direction", "0");
                }
                else
                {
                        $this->ctrl->setParameter($this, "direction", "-1");
                }
                $this->ctrl->redirect($this, "redirectQuestion");
        }

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ilSurveyExecutionGUI::redirectQuestion ( )

Called when a user answered a page to perform a redirect after POST.

This is called for security reasons to prevent users sending a form twice.

public

Definition at line 208 of file class.ilSurveyExecutionGUI.php.

References $_GET, and outSurveyPage().

        {
                switch ($_GET["activecommand"])
                {
                        case "next":
                                $this->outSurveyPage($_GET["qid"], $_GET["direction"]);
                                break;
                        case "previous":
                                $this->outSurveyPage($_GET["qid"], $_GET["direction"]);
                                break;
                        case "gotoPage":
                                $this->outSurveyPage($_GET["qid"], $_GET["direction"]);
                                break;
                        case "default":
                                $this->outSurveyPage($_GET["qid"]);
                                break;
                        default:
                                // don't save input, go to the first page
                                $this->outSurveyPage();
                                break;
                }
        }

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ilSurveyExecutionGUI::resume ( )

Resumes the survey.

Resumes the survey

private

Definition at line 114 of file class.ilSurveyExecutionGUI.php.

References start().

        {
                $this->start(true);
        }

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ilSurveyExecutionGUI::runShowFinishedPage ( )

Creates the finished page for a running survey.

Creates the finished page for a running survey

public

Definition at line 661 of file class.ilSurveyExecutionGUI.php.

References $_SESSION.

Referenced by outSurveyPage().

        {
                unset($_SESSION["anonymous_id"][$this->object->getId()]);
                if (strlen($this->object->getOutro()) == 0)
                {
                        $this->ctrl->redirectByClass("ilobjsurveygui", "backToRepository");
                }
                else
                {
                        $this->tpl->addBlockFile("ADM_CONTENT", "adm_content", "tpl.il_svy_svy_finished.html", "Modules/Survey");
                        $this->tpl->setVariable("TEXT_FINISHED", $this->object->prepareTextareaOutput($this->object->getOutro()));
                        $this->tpl->setVariable("BTN_EXIT", $this->lng->txt("exit"));
                        $this->tpl->setVariable("FORM_ACTION", $this->ctrl->getFormAction($this, "runShowFinishedPage"));
                }
        }

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ilSurveyExecutionGUI::saveActiveQuestionData ( & $data )

Saves the users input of the active page.

Saves the users input of the active page

private

Definition at line 602 of file class.ilSurveyExecutionGUI.php.

References $_POST, $_SESSION, $data, $ilUser, SurveyQuestion\_instanciateQuestion(), and preview().

Referenced by navigate(), and saveUserInput().

        {
                global $ilUser;
                
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                $question =& SurveyQuestion::_instanciateQuestion($data["question_id"]);
                $error = $question->checkUserInput($_POST, $this->object->getSurveyId());
                if (strlen($error) == 0)
                {
                        if(!$this->preview)
                        {
                                $user_id = $ilUser->getId();
                        
                                // delete old answers
                                $this->object->deleteWorkingData($data["question_id"], $_SESSION["finished_id"][$this->object->getId()]);
                                if ($this->object->isSurveyStarted($user_id, $_SESSION["anonymous_id"][$this->object->getId()]) === false)
                                {
                                        $_SESSION["finished_id"][$this->object->getId()] = $this->object->startSurvey($user_id, $_SESSION["anonymous_id"][$this->object->getId()]);
                                }
                                if ($this->object->getAnonymize())
                                {
                                        $user_id = 0;
                                }                               
                                $question->saveUserInput($_POST, $_SESSION["finished_id"][$this->object->getId()]);
                        }
                        else
                        {
                                $_SESSION["preview_data"][$this->object->getId()][$data["question_id"]] = 
                                        $question->saveUserInput($_POST, $_SESSION["finished_id"][$this->object->getId()], true);
                        }
                        return 0;
                }
                else
                {
                        $_SESSION["svy_errors"][$question->getId()] = $error;
                        return 1;
                }
        }

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ilSurveyExecutionGUI::saveUserInput ( $navigationDirection = "next" )

Save the user's input.

private

Definition at line 486 of file class.ilSurveyExecutionGUI.php.

References $_GET, $_POST, $_SESSION, $data, $ilUser, preview(), saveActiveQuestionData(), and ilUtil\sendFailure().

Referenced by next(), and previous().

        {
                global $ilUser;
                global $rbacsystem;
                if (!$rbacsystem->checkAccess("read", $this->object->ref_id)) 
                {
                        // only with read access it is possible to run the test
                        $this->ilias->raiseError($this->lng->txt("cannot_read_survey"),$this->ilias->error_obj->MESSAGE);
                }
                if(!$this->preview)
                {
                        $this->object->setEndTime($_SESSION["finished_id"][$this->object->getId()]);
                }
                
                // check users input when it is a metric question
                unset($_SESSION["svy_errors"]);
                $_SESSION["postdata"] = $_POST;
                $page_error = 0;
                $page = $this->object->getNextPage($_GET["qid"], 0);
                foreach ($page as $data)
                {
                        $page_error += $this->saveActiveQuestionData($data);
                }
                if ($page_error && (strcmp($navigationDirection, "previous") != 0))
                {
                        if ($page_error == 1)
                        {
                                ilUtil::sendFailure($this->lng->txt("svy_page_error"), TRUE);
                        }
                        else
                        {
                                ilUtil::sendFailure($this->lng->txt("svy_page_errors"), TRUE);
                        }
                }
                else
                {
                        $page_error = "";
                        unset($_SESSION["svy_errors"]);
                }
                return $page_error;
        }

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ilSurveyExecutionGUI::start ( $resume = false )

Starts the survey.

Starts the survey

private

Definition at line 126 of file class.ilSurveyExecutionGUI.php.

References $_POST, $_SESSION, $ilUser, preview(), and ilUtil\sendFailure().

Referenced by resume().

        {
                global $ilUser;
                global $rbacsystem;
                if($this->preview)
                {
                        unset($_SESSION["preview_data"]); 
                }
                unset($_SESSION["svy_errors"]);
                if (!$rbacsystem->checkAccess("read", $this->object->ref_id)) 
                {
                        // only with read access it is possible to run the test
                        $this->ilias->raiseError($this->lng->txt("cannot_read_survey"),$this->ilias->error_obj->MESSAGE);
                }
                if ($this->object->getAnonymize() && !$this->object->isAccessibleWithoutCode())
                {
                        if ($resume)
                        {
                                $anonymize_key = $this->object->getAnonymousId($_POST["anonymous_id"]);
                                if ($anonymize_key)
                                {
                                        $_SESSION["anonymous_id"][$this->object->getId()] = $anonymize_key;
                                }
                                else
                                {
                                        unset($_POST["cmd"]["resume"]);
                                        ilUtil::sendFailure(sprintf($this->lng->txt("error_retrieving_anonymous_survey"), $_POST["anonymous_id"]));
                                }
                        }
                }
                
                $direction = 0;
                if ($this->object->getAnonymize() && !$this->object->isAccessibleWithoutCode())
                {
                        if ($this->object->checkSurveyCode($_POST["anonymous_id"]))
                        {
                                $_SESSION["anonymous_id"][$this->object->getId()] = $_POST["anonymous_id"];
                        }
                        else
                        {
                                ilUtil::sendFailure(sprintf($this->lng->txt("error_retrieving_anonymous_survey"), $_POST["anonymous_id"]), true);
                                $this->ctrl->redirectByClass("ilobjsurveygui", "infoScreen");
                        }
                }
                if ($this->object->isAccessibleWithoutCode())
                {
                        $anonymous_id = $this->object->getUserSurveyCode($ilUser->getId());
                        if (strlen($anonymous_id))
                        {
                                $_SESSION["anonymous_id"][$this->object->getId()] = $anonymous_id;
                        }
                        else
                        {
                                $_SESSION["anonymous_id"][$this->object->getId()] = $this->object->createNewAccessCode();
                        }
                }
                
                $activepage = "";
                if ($resume)
                {
                        $activepage = $this->object->getLastActivePage($_SESSION["finished_id"][$this->object->getId()]);
                        $direction = 0;
                }
                // explicitly set the survey started!
                if ($this->object->isSurveyStarted($ilUser->getId(), $_SESSION["anonymous_id"][$this->object->getId()]) === FALSE)
                {
                        $_SESSION["finished_id"][$this->object->getId()] = $this->object->startSurvey($ilUser->getId(), $_SESSION["anonymous_id"][$this->object->getId()]);
                }
                if (strlen($activepage)) $this->ctrl->setParameter($this, "qid", $activepage);
                $this->ctrl->setParameter($this, "activecommand", "default");
                $this->ctrl->redirect($this, "redirectQuestion");
        }