Ejemplo n.º 1
0
 public function display($quiz, $cm, $course)
 {
     global $CFG, $DB, $PAGE;
     $this->quiz = $quiz;
     $this->cm = $cm;
     $this->course = $course;
     // Get the URL options.
     $slot = optional_param('slot', null, PARAM_INT);
     $questionid = optional_param('qid', null, PARAM_INT);
     $grade = optional_param('grade', null, PARAM_ALPHA);
     $includeauto = optional_param('includeauto', false, PARAM_BOOL);
     if (!in_array($grade, array('all', 'needsgrading', 'autograded', 'manuallygraded'))) {
         $grade = null;
     }
     $pagesize = optional_param('pagesize', self::DEFAULT_PAGE_SIZE, PARAM_INT);
     $page = optional_param('page', 0, PARAM_INT);
     $order = optional_param('order', self::DEFAULT_ORDER, PARAM_ALPHA);
     // Assemble the options requried to reload this page.
     $optparams = array('includeauto', 'page');
     foreach ($optparams as $param) {
         if (${$param}) {
             $this->viewoptions[$param] = ${$param};
         }
     }
     if ($pagesize != self::DEFAULT_PAGE_SIZE) {
         $this->viewoptions['pagesize'] = $pagesize;
     }
     if ($order != self::DEFAULT_ORDER) {
         $this->viewoptions['order'] = $order;
     }
     // Check permissions.
     $this->context = context_module::instance($cm->id);
     require_capability('mod/quiz:grade', $this->context);
     $shownames = has_capability('quiz/grading:viewstudentnames', $this->context);
     $showidnumbers = has_capability('quiz/grading:viewidnumber', $this->context);
     // Validate order.
     if (!in_array($order, array('random', 'date', 'studentfirstname', 'studentlastname', 'idnumber'))) {
         $order = self::DEFAULT_ORDER;
     } else {
         if (!$shownames && ($order == 'studentfirstname' || $order == 'studentlastname')) {
             $order = self::DEFAULT_ORDER;
         } else {
             if (!$showidnumbers && $order == 'idnumber') {
                 $order = self::DEFAULT_ORDER;
             }
         }
     }
     if ($order == 'random') {
         $page = 0;
     }
     // Get the list of questions in this quiz.
     $this->questions = quiz_report_get_significant_questions($quiz);
     if ($slot && !array_key_exists($slot, $this->questions)) {
         throw new moodle_exception('unknownquestion', 'quiz_grading');
     }
     // Process any submitted data.
     if ($data = data_submitted() && confirm_sesskey() && $this->validate_submitted_marks()) {
         $this->process_submitted_data();
         redirect($this->grade_question_url($slot, $questionid, $grade, $page + 1));
     }
     // Get the group, and the list of significant users.
     $this->currentgroup = $this->get_current_group($cm, $course, $this->context);
     if ($this->currentgroup == self::NO_GROUPS_ALLOWED) {
         $this->users = array();
     } else {
         $this->users = get_users_by_capability($this->context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'), '', '', '', '', $this->currentgroup, '', false);
     }
     $hasquestions = quiz_has_questions($quiz->id);
     $counts = null;
     if ($slot && $hasquestions) {
         // Make sure there is something to do.
         $statecounts = $this->get_question_state_summary(array($slot));
         foreach ($statecounts as $record) {
             if ($record->questionid == $questionid) {
                 $counts = $record;
                 break;
             }
         }
         // If not, redirect back to the list.
         if (!$counts || $counts->{$grade} == 0) {
             redirect($this->list_questions_url(), get_string('alldoneredirecting', 'quiz_grading'));
         }
     }
     // Start output.
     $this->print_header_and_tabs($cm, $course, $quiz, 'grading');
     // What sort of page to display?
     if (!$hasquestions) {
         echo quiz_no_questions_message($quiz, $cm, $this->context);
     } else {
         if (!$slot) {
             $this->display_index($includeauto);
         } else {
             $this->display_grading_interface($slot, $questionid, $grade, $pagesize, $page, $shownames, $showidnumbers, $order, $counts);
         }
     }
     return true;
 }
Ejemplo n.º 2
0
 public function display($quiz, $cm, $course)
 {
     global $OUTPUT;
     list($currentgroup, $students, $groupstudents, $allowed) = $this->init('responses', 'quiz_responses_settings_form', $quiz, $cm, $course);
     $options = new quiz_responses_options('responses', $quiz, $cm, $course);
     if ($fromform = $this->form->get_data()) {
         $options->process_settings_from_form($fromform);
     } else {
         $options->process_settings_from_params();
     }
     $this->form->set_data($options->get_initial_form_data());
     if ($options->attempts == self::ALL_WITH) {
         // This option is only available to users who can access all groups in
         // groups mode, so setting allowed to empty (which means all quiz attempts
         // are accessible, is not a security porblem.
         $allowed = array();
     }
     // Load the required questions.
     $questions = quiz_report_get_significant_questions($quiz);
     // Prepare for downloading, if applicable.
     $courseshortname = format_string($course->shortname, true, array('context' => context_course::instance($course->id)));
     if ($options->whichtries === question_attempt::LAST_TRY) {
         $tableclassname = 'quiz_last_responses_table';
     } else {
         $tableclassname = 'quiz_first_or_all_responses_table';
     }
     $table = new $tableclassname($quiz, $this->context, $this->qmsubselect, $options, $groupstudents, $students, $questions, $options->get_url());
     $filename = quiz_report_download_filename(get_string('responsesfilename', 'quiz_responses'), $courseshortname, $quiz->name);
     $table->is_downloading($options->download, $filename, $courseshortname . ' ' . format_string($quiz->name, true));
     if ($table->is_downloading()) {
         raise_memory_limit(MEMORY_EXTRA);
     }
     $this->process_actions($quiz, $cm, $currentgroup, $groupstudents, $allowed, $options->get_url());
     // Start output.
     if (!$table->is_downloading()) {
         // Only print headers if not asked to download data.
         $this->print_header_and_tabs($cm, $course, $quiz, $this->mode);
     }
     if ($groupmode = groups_get_activity_groupmode($cm)) {
         // Groups are being used, so output the group selector if we are not downloading.
         if (!$table->is_downloading()) {
             groups_print_activity_menu($cm, $options->get_url());
         }
     }
     // Print information on the number of existing attempts.
     if (!$table->is_downloading()) {
         // Do not print notices when downloading.
         if ($strattemptnum = quiz_num_attempt_summary($quiz, $cm, true, $currentgroup)) {
             echo '<div class="quizattemptcounts">' . $strattemptnum . '</div>';
         }
     }
     $hasquestions = quiz_has_questions($quiz->id);
     if (!$table->is_downloading()) {
         if (!$hasquestions) {
             echo quiz_no_questions_message($quiz, $cm, $this->context);
         } else {
             if (!$students) {
                 echo $OUTPUT->notification(get_string('nostudentsyet'));
             } else {
                 if ($currentgroup && !$groupstudents) {
                     echo $OUTPUT->notification(get_string('nostudentsingroup'));
                 }
             }
         }
         // Print the display options.
         $this->form->display();
     }
     $hasstudents = $students && (!$currentgroup || $groupstudents);
     if ($hasquestions && ($hasstudents || $options->attempts == self::ALL_WITH)) {
         list($fields, $from, $where, $params) = $table->base_sql($allowed);
         $table->set_count_sql("SELECT COUNT(1) FROM {$from} WHERE {$where}", $params);
         $table->set_sql($fields, $from, $where, $params);
         if (!$table->is_downloading()) {
             // Print information on the grading method.
             if ($strattempthighlight = quiz_report_highlighting_grading_method($quiz, $this->qmsubselect, $options->onlygraded)) {
                 echo '<div class="quizattemptcounts">' . $strattempthighlight . '</div>';
             }
         }
         // Define table columns.
         $columns = array();
         $headers = array();
         if (!$table->is_downloading() && $options->checkboxcolumn) {
             $columns[] = 'checkbox';
             $headers[] = null;
         }
         $this->add_user_columns($table, $columns, $headers);
         $this->add_state_column($columns, $headers);
         if ($table->is_downloading()) {
             $this->add_time_columns($columns, $headers);
         }
         $this->add_grade_columns($quiz, $options->usercanseegrades, $columns, $headers);
         foreach ($questions as $id => $question) {
             if ($options->showqtext) {
                 $columns[] = 'question' . $id;
                 $headers[] = get_string('questionx', 'question', $question->number);
             }
             if ($options->showresponses) {
                 $columns[] = 'response' . $id;
                 $headers[] = get_string('responsex', 'quiz_responses', $question->number);
             }
             if ($options->showright) {
                 $columns[] = 'right' . $id;
                 $headers[] = get_string('rightanswerx', 'quiz_responses', $question->number);
             }
         }
         $table->define_columns($columns);
         $table->define_headers($headers);
         $table->sortable(true, 'uniqueid');
         // Set up the table.
         $table->define_baseurl($options->get_url());
         $this->configure_user_columns($table);
         $table->no_sorting('feedbacktext');
         $table->column_class('sumgrades', 'bold');
         $table->set_attribute('id', 'responses');
         $table->collapsible(true);
         $table->out($options->pagesize, true);
     }
     return true;
 }
Ejemplo n.º 3
0
 public function display($quiz, $cm, $course)
 {
     global $CFG, $DB, $OUTPUT, $PAGE;
     list($currentgroup, $students, $groupstudents, $allowed) = $this->init('overview', 'quiz_overview_settings_form', $quiz, $cm, $course);
     $options = new quiz_overview_options('overview', $quiz, $cm, $course);
     if ($fromform = $this->form->get_data()) {
         $options->process_settings_from_form($fromform);
     } else {
         $options->process_settings_from_params();
     }
     $this->form->set_data($options->get_initial_form_data());
     if ($options->attempts == self::ALL_WITH) {
         // This option is only available to users who can access all groups in
         // groups mode, so setting allowed to empty (which means all quiz attempts
         // are accessible, is not a security porblem.
         $allowed = array();
     }
     // Load the required questions.
     $questions = quiz_report_get_significant_questions($quiz);
     // Prepare for downloading, if applicable.
     $courseshortname = format_string($course->shortname, true, array('context' => context_course::instance($course->id)));
     $table = new quiz_overview_table($quiz, $this->context, $this->qmsubselect, $options, $groupstudents, $students, $questions, $options->get_url());
     $filename = quiz_report_download_filename(get_string('overviewfilename', 'quiz_overview'), $courseshortname, $quiz->name);
     $table->is_downloading($options->download, $filename, $courseshortname . ' ' . format_string($quiz->name, true));
     if ($table->is_downloading()) {
         raise_memory_limit(MEMORY_EXTRA);
     }
     $this->course = $course;
     // Hack to make this available in process_actions.
     $this->process_actions($quiz, $cm, $currentgroup, $groupstudents, $allowed, $options->get_url());
     // Start output.
     if (!$table->is_downloading()) {
         // Only print headers if not asked to download data.
         $this->print_header_and_tabs($cm, $course, $quiz, $this->mode);
     }
     if ($groupmode = groups_get_activity_groupmode($cm)) {
         // Groups are being used, so output the group selector if we are not downloading.
         if (!$table->is_downloading()) {
             groups_print_activity_menu($cm, $options->get_url());
         }
     }
     // Print information on the number of existing attempts.
     if (!$table->is_downloading()) {
         // Do not print notices when downloading.
         if ($strattemptnum = quiz_num_attempt_summary($quiz, $cm, true, $currentgroup)) {
             echo '<div class="quizattemptcounts">' . $strattemptnum . '</div>';
         }
     }
     $hasquestions = quiz_has_questions($quiz->id);
     if (!$table->is_downloading()) {
         if (!$hasquestions) {
             echo quiz_no_questions_message($quiz, $cm, $this->context);
         } else {
             if (!$students) {
                 echo $OUTPUT->notification(get_string('nostudentsyet'));
             } else {
                 if ($currentgroup && !$groupstudents) {
                     echo $OUTPUT->notification(get_string('nostudentsingroup'));
                 }
             }
         }
         // Print the display options.
         $this->form->display();
     }
     $hasstudents = $students && (!$currentgroup || $groupstudents);
     if ($hasquestions && ($hasstudents || $options->attempts == self::ALL_WITH)) {
         // Construct the SQL.
         $fields = $DB->sql_concat('u.id', "'#'", 'COALESCE(quiza.attempt, 0)') . ' AS uniqueid, ';
         list($fields, $from, $where, $params) = $table->base_sql($allowed);
         $table->set_count_sql("SELECT COUNT(1) FROM {$from} WHERE {$where}", $params);
         // Test to see if there are any regraded attempts to be listed.
         $fields .= ", COALESCE((\n                                SELECT MAX(qqr.regraded)\n                                  FROM {quiz_overview_regrades} qqr\n                                 WHERE qqr.questionusageid = quiza.uniqueid\n                          ), -1) AS regraded";
         if ($options->onlyregraded) {
             $where .= " AND COALESCE((\n                                    SELECT MAX(qqr.regraded)\n                                      FROM {quiz_overview_regrades} qqr\n                                     WHERE qqr.questionusageid = quiza.uniqueid\n                                ), -1) <> -1";
         }
         $table->set_sql($fields, $from, $where, $params);
         if (!$table->is_downloading()) {
             // Output the regrade buttons.
             if (has_capability('mod/quiz:regrade', $this->context)) {
                 $regradesneeded = $this->count_question_attempts_needing_regrade($quiz, $groupstudents);
                 if ($currentgroup) {
                     $a = new stdClass();
                     $a->groupname = groups_get_group_name($currentgroup);
                     $a->coursestudents = get_string('participants');
                     $a->countregradeneeded = $regradesneeded;
                     $regradealldrydolabel = get_string('regradealldrydogroup', 'quiz_overview', $a);
                     $regradealldrylabel = get_string('regradealldrygroup', 'quiz_overview', $a);
                     $regradealllabel = get_string('regradeallgroup', 'quiz_overview', $a);
                 } else {
                     $regradealldrydolabel = get_string('regradealldrydo', 'quiz_overview', $regradesneeded);
                     $regradealldrylabel = get_string('regradealldry', 'quiz_overview');
                     $regradealllabel = get_string('regradeall', 'quiz_overview');
                 }
                 $displayurl = new moodle_url($options->get_url(), array('sesskey' => sesskey()));
                 echo '<div class="mdl-align">';
                 echo '<form action="' . $displayurl->out_omit_querystring() . '">';
                 echo '<div>';
                 echo html_writer::input_hidden_params($displayurl);
                 echo '<input type="submit" name="regradeall" value="' . $regradealllabel . '"/>';
                 echo '<input type="submit" name="regradealldry" value="' . $regradealldrylabel . '"/>';
                 if ($regradesneeded) {
                     echo '<input type="submit" name="regradealldrydo" value="' . $regradealldrydolabel . '"/>';
                 }
                 echo '</div>';
                 echo '</form>';
                 echo '</div>';
             }
             // Print information on the grading method.
             if ($strattempthighlight = quiz_report_highlighting_grading_method($quiz, $this->qmsubselect, $options->onlygraded)) {
                 echo '<div class="quizattemptcounts">' . $strattempthighlight . '</div>';
             }
         }
         // Define table columns.
         $columns = array();
         $headers = array();
         if (!$table->is_downloading() && $options->checkboxcolumn) {
             $columns[] = 'checkbox';
             $headers[] = null;
         }
         $this->add_user_columns($table, $columns, $headers);
         $this->add_state_column($columns, $headers);
         $this->add_time_columns($columns, $headers);
         $this->add_grade_columns($quiz, $options->usercanseegrades, $columns, $headers, false);
         if (!$table->is_downloading() && has_capability('mod/quiz:regrade', $this->context) && $this->has_regraded_questions($from, $where, $params)) {
             $columns[] = 'regraded';
             $headers[] = get_string('regrade', 'quiz_overview');
         }
         if ($options->slotmarks) {
             foreach ($questions as $slot => $question) {
                 // Ignore questions of zero length.
                 $columns[] = 'qsgrade' . $slot;
                 $header = get_string('qbrief', 'quiz', $question->number);
                 if (!$table->is_downloading()) {
                     $header .= '<br />';
                 } else {
                     $header .= ' ';
                 }
                 $header .= '/' . quiz_rescale_grade($question->maxmark, $quiz, 'question');
                 $headers[] = $header;
             }
         }
         $this->set_up_table_columns($table, $columns, $headers, $this->get_base_url(), $options, false);
         $table->set_attribute('class', 'generaltable generalbox grades');
         $table->out($options->pagesize, true);
     }
     if (!$table->is_downloading() && $options->usercanseegrades) {
         $output = $PAGE->get_renderer('mod_quiz');
         if ($currentgroup && $groupstudents) {
             list($usql, $params) = $DB->get_in_or_equal($groupstudents);
             $params[] = $quiz->id;
             if ($DB->record_exists_select('quiz_grades', "userid {$usql} AND quiz = ?", $params)) {
                 $imageurl = new moodle_url('/mod/quiz/report/overview/overviewgraph.php', array('id' => $quiz->id, 'groupid' => $currentgroup));
                 $graphname = get_string('overviewreportgraphgroup', 'quiz_overview', groups_get_group_name($currentgroup));
                 echo $output->graph($imageurl, $graphname);
             }
         }
         if ($DB->record_exists('quiz_grades', array('quiz' => $quiz->id))) {
             $imageurl = new moodle_url('/mod/quiz/report/overview/overviewgraph.php', array('id' => $quiz->id));
             $graphname = get_string('overviewreportgraph', 'quiz_overview');
             echo $output->graph($imageurl, $graphname);
         }
     }
     return true;
 }
Ejemplo n.º 4
0
 /**
  * Display the report.
  */
 public function display($quiz, $cm, $course)
 {
     global $OUTPUT;
     raise_memory_limit(MEMORY_HUGE);
     $this->context = context_module::instance($cm->id);
     if (!quiz_has_questions($quiz->id)) {
         $this->print_header_and_tabs($cm, $course, $quiz, 'statistics');
         echo quiz_no_questions_message($quiz, $cm, $this->context);
         return true;
     }
     // Work out the display options.
     $download = optional_param('download', '', PARAM_ALPHA);
     $everything = optional_param('everything', 0, PARAM_BOOL);
     $recalculate = optional_param('recalculate', 0, PARAM_BOOL);
     // A qid paramter indicates we should display the detailed analysis of a sub question.
     $qid = optional_param('qid', 0, PARAM_INT);
     $slot = optional_param('slot', 0, PARAM_INT);
     $variantno = optional_param('variant', null, PARAM_INT);
     $whichattempts = optional_param('whichattempts', $quiz->grademethod, PARAM_INT);
     $whichtries = optional_param('whichtries', question_attempt::LAST_TRY, PARAM_ALPHA);
     $pageoptions = array();
     $pageoptions['id'] = $cm->id;
     $pageoptions['mode'] = 'statistics';
     $reporturl = new moodle_url('/mod/quiz/report.php', $pageoptions);
     $mform = new quiz_statistics_settings_form($reporturl, compact('quiz'));
     $mform->set_data(array('whichattempts' => $whichattempts, 'whichtries' => $whichtries));
     if ($whichattempts != $quiz->grademethod) {
         $reporturl->param('whichattempts', $whichattempts);
     }
     if ($whichtries != question_attempt::LAST_TRY) {
         $reporturl->param('whichtries', $whichtries);
     }
     // Find out current groups mode.
     $currentgroup = $this->get_current_group($cm, $course, $this->context);
     $nostudentsingroup = false;
     // True if a group is selected and there is no one in it.
     if (empty($currentgroup)) {
         $currentgroup = 0;
         $groupstudents = array();
     } else {
         if ($currentgroup == self::NO_GROUPS_ALLOWED) {
             $groupstudents = array();
             $nostudentsingroup = true;
         } else {
             // All users who can attempt quizzes and who are in the currently selected group.
             $groupstudents = get_users_by_capability($this->context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'), '', '', '', '', $currentgroup, '', false);
             if (!$groupstudents) {
                 $nostudentsingroup = true;
             }
         }
     }
     $qubaids = quiz_statistics_qubaids_condition($quiz->id, $groupstudents, $whichattempts);
     // If recalculate was requested, handle that.
     if ($recalculate && confirm_sesskey()) {
         $this->clear_cached_data($qubaids);
         redirect($reporturl);
     }
     // Set up the main table.
     $this->table = new quiz_statistics_table();
     if ($everything) {
         $report = get_string('completestatsfilename', 'quiz_statistics');
     } else {
         $report = get_string('questionstatsfilename', 'quiz_statistics');
     }
     $courseshortname = format_string($course->shortname, true, array('context' => context_course::instance($course->id)));
     $filename = quiz_report_download_filename($report, $courseshortname, $quiz->name);
     $this->table->is_downloading($download, $filename, get_string('quizstructureanalysis', 'quiz_statistics'));
     $questions = $this->load_and_initialise_questions_for_calculations($quiz);
     // Print the page header stuff (if not downloading.
     if (!$this->table->is_downloading()) {
         $this->print_header_and_tabs($cm, $course, $quiz, 'statistics');
     }
     if (!$nostudentsingroup) {
         // Get the data to be displayed.
         $progress = $this->get_progress_trace_instance();
         list($quizstats, $questionstats) = $this->get_all_stats_and_analysis($quiz, $whichattempts, $whichtries, $groupstudents, $questions, $progress);
     } else {
         // Or create empty stats containers.
         $quizstats = new \quiz_statistics\calculated($whichattempts);
         $questionstats = new \core_question\statistics\questions\all_calculated_for_qubaid_condition();
     }
     // Set up the table, if there is data.
     if ($quizstats->s()) {
         $this->table->statistics_setup($quiz, $cm->id, $reporturl, $quizstats->s());
     }
     // Print the rest of the page header stuff (if not downloading.
     if (!$this->table->is_downloading()) {
         if (groups_get_activity_groupmode($cm)) {
             groups_print_activity_menu($cm, $reporturl->out());
             if ($currentgroup && !$groupstudents) {
                 $OUTPUT->notification(get_string('nostudentsingroup', 'quiz_statistics'));
             }
         }
         if (!$this->table->is_downloading() && $quizstats->s() == 0) {
             echo $OUTPUT->notification(get_string('noattempts', 'quiz'));
         }
         foreach ($questionstats->any_error_messages() as $errormessage) {
             echo $OUTPUT->notification($errormessage);
         }
         // Print display options form.
         $mform->display();
     }
     if ($everything) {
         // Implies is downloading.
         // Overall report, then the analysis of each question.
         $quizinfo = $quizstats->get_formatted_quiz_info_data($course, $cm, $quiz);
         $this->download_quiz_info_table($quizinfo);
         if ($quizstats->s()) {
             $this->output_quiz_structure_analysis_table($questionstats);
             if ($this->table->is_downloading() == 'xhtml' && $quizstats->s() != 0) {
                 $this->output_statistics_graph($quiz->id, $currentgroup, $whichattempts);
             }
             $this->output_all_question_response_analysis($qubaids, $questions, $questionstats, $reporturl, $whichtries);
         }
         $this->table->export_class_instance()->finish_document();
     } else {
         if ($qid) {
             // Report on an individual sub-question indexed questionid.
             if (is_null($questionstats->for_subq($qid, $variantno))) {
                 print_error('questiondoesnotexist', 'question');
             }
             $this->output_individual_question_data($quiz, $questionstats->for_subq($qid, $variantno));
             $this->output_individual_question_response_analysis($questionstats->for_subq($qid, $variantno)->question, $variantno, $questionstats->for_subq($qid, $variantno)->s, $reporturl, $qubaids, $whichtries);
             // Back to overview link.
             echo $OUTPUT->box('<a href="' . $reporturl->out() . '">' . get_string('backtoquizreport', 'quiz_statistics') . '</a>', 'boxaligncenter generalbox boxwidthnormal mdl-align');
         } else {
             if ($slot) {
                 // Report on an individual question indexed by position.
                 if (!isset($questions[$slot])) {
                     print_error('questiondoesnotexist', 'question');
                 }
                 if ($variantno === null && ($questionstats->for_slot($slot)->get_sub_question_ids() || $questionstats->for_slot($slot)->get_variants())) {
                     if (!$this->table->is_downloading()) {
                         $number = $questionstats->for_slot($slot)->question->number;
                         echo $OUTPUT->heading(get_string('slotstructureanalysis', 'quiz_statistics', $number), 3);
                     }
                     $this->table->define_baseurl(new moodle_url($reporturl, array('slot' => $slot)));
                     $this->table->format_and_add_array_of_rows($questionstats->structure_analysis_for_one_slot($slot));
                 } else {
                     $this->output_individual_question_data($quiz, $questionstats->for_slot($slot, $variantno));
                     $this->output_individual_question_response_analysis($questions[$slot], $variantno, $questionstats->for_slot($slot, $variantno)->s, $reporturl, $qubaids, $whichtries);
                 }
                 if (!$this->table->is_downloading()) {
                     // Back to overview link.
                     echo $OUTPUT->box('<a href="' . $reporturl->out() . '">' . get_string('backtoquizreport', 'quiz_statistics') . '</a>', 'backtomainstats boxaligncenter generalbox boxwidthnormal mdl-align');
                 } else {
                     $this->table->finish_output();
                 }
             } else {
                 if ($this->table->is_downloading()) {
                     // Downloading overview report.
                     $quizinfo = $quizstats->get_formatted_quiz_info_data($course, $cm, $quiz);
                     $this->download_quiz_info_table($quizinfo);
                     if ($quizstats->s()) {
                         $this->output_quiz_structure_analysis_table($questionstats);
                     }
                     $this->table->finish_output();
                 } else {
                     // On-screen display of overview report.
                     echo $OUTPUT->heading(get_string('quizinformation', 'quiz_statistics'), 3);
                     echo $this->output_caching_info($quizstats->timemodified, $quiz->id, $groupstudents, $whichattempts, $reporturl);
                     echo $this->everything_download_options();
                     $quizinfo = $quizstats->get_formatted_quiz_info_data($course, $cm, $quiz);
                     echo $this->output_quiz_info_table($quizinfo);
                     if ($quizstats->s()) {
                         echo $OUTPUT->heading(get_string('quizstructureanalysis', 'quiz_statistics'), 3);
                         $this->output_quiz_structure_analysis_table($questionstats);
                         $this->output_statistics_graph($quiz->id, $currentgroup, $whichattempts);
                     }
                 }
             }
         }
     }
     return true;
 }
 public function display($quiz, $cm, $course)
 {
     global $CFG, $PAGE, $OUTPUT;
     $PAGE->set_pagelayout('print');
     $PAGE->requires->js('/mod/quiz/report/categorygrades/categorygrades.js');
     $this->quiz = $quiz;
     $this->cm = $cm;
     $this->course = $course;
     // Get the URL options.
     $group = optional_param('group', null, PARAM_INT);
     $pagesize = optional_param('pagesize', self::DEFAULT_PAGE_SIZE, PARAM_INT);
     $page = optional_param('page', 0, PARAM_INT);
     $order = optional_param('order', self::DEFAULT_ORDER, PARAM_ALPHA);
     $qubaid = optional_param('qubaid', null, PARAM_INT);
     // Assemble the options required to reload this page.
     $optparams = array('page');
     foreach ($optparams as $param) {
         if (${$param}) {
             $this->viewoptions[$param] = ${$param};
         }
     }
     if ($pagesize != self::DEFAULT_PAGE_SIZE) {
         $this->viewoptions['pagesize'] = $pagesize;
     }
     if ($order != self::DEFAULT_ORDER) {
         $this->viewoptions['order'] = $order;
     }
     // Check permissions.
     $this->context = context_module::instance($cm->id);
     require_capability('mod/quiz:grade', $this->context);
     $shownames = has_capability('quiz/grading:viewstudentnames', $this->context);
     $showidnumbers = has_capability('quiz/grading:viewidnumber', $this->context);
     // Validate order.
     if (!in_array($order, array('random', 'date', 'firstname', 'lastname', 'idnumber'))) {
         $order = self::DEFAULT_ORDER;
     } else {
         if (!$shownames && ($order == 'firstname' || $order == 'lastname')) {
             $order = self::DEFAULT_ORDER;
         } else {
             if (!$showidnumbers && $order == 'idnumber') {
                 $order = self::DEFAULT_ORDER;
             }
         }
     }
     if ($order == 'random') {
         $page = 0;
     }
     // Get the group, and the list of significant users.
     $this->currentgroup = $this->get_current_group($cm, $course, $this->context);
     if ($this->currentgroup == self::NO_GROUPS_ALLOWED) {
         $this->users = array();
     } else {
         $this->users = get_users_by_capability($this->context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'), '', '', '', '', $this->currentgroup, '', false);
     }
     $hasquestions = quiz_has_questions($quiz->id);
     // Start output.
     $this->print_header_and_tabs($cm, $course, $quiz, 'categorygrades');
     echo $OUTPUT->heading(get_string('categorygrades', 'quiz_categorygrades'), 2, 'cg_heading');
     echo "<link rel=\"stylesheet\" type=\"text/css\" href=\"//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css\">\n";
     // What sort of page to display?
     if (!$hasquestions) {
         echo quiz_no_questions_message($quiz, $cm, $this->context);
     } else {
         if (!isset($group)) {
             $group = $this->currentgroup;
         }
     }
     if ($groupmode = groups_get_activity_groupmode($this->cm)) {
         // Groups is being used.
         groups_print_activity_menu($this->cm, $PAGE->url, false, true);
     }
     $this->display_attempts($pagesize, $page, $shownames, $showidnumbers, $order, $group, $qubaid);
     return true;
 }