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bdbe3cd268
This ensures that the page reloads if the student uses the Back or Forwards buttons within an attempt. This avoids questions being in a stale state, or the timer showing the wrong time. Thanks to Jake Dallimore and Russell Boyatt for suggestions which lead to this fix.
117 lines
4.3 KiB
PHP
117 lines
4.3 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This script deals with starting a new attempt at a quiz.
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*
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* Normally, it will end up redirecting to attempt.php - unless a password form is displayed.
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*
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* This code used to be at the top of attempt.php, if you are looking for CVS history.
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*
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* @package mod_quiz
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* @copyright 2009 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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require_once(__DIR__ . '/../../config.php');
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require_once($CFG->dirroot . '/mod/quiz/locallib.php');
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// Get submitted parameters.
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$id = required_param('cmid', PARAM_INT); // Course module id
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$forcenew = optional_param('forcenew', false, PARAM_BOOL); // Used to force a new preview
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$page = optional_param('page', -1, PARAM_INT); // Page to jump to in the attempt.
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if (!$cm = get_coursemodule_from_id('quiz', $id)) {
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print_error('invalidcoursemodule');
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}
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if (!$course = $DB->get_record('course', array('id' => $cm->course))) {
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print_error("coursemisconf");
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}
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$quizobj = quiz::create($cm->instance, $USER->id);
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// This script should only ever be posted to, so set page URL to the view page.
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$PAGE->set_url($quizobj->view_url());
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// During quiz attempts, the browser back/forwards buttons should force a reload.
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$PAGE->set_cacheable(false);
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// Check login and sesskey.
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require_login($quizobj->get_course(), false, $quizobj->get_cm());
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require_sesskey();
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$PAGE->set_heading($quizobj->get_course()->fullname);
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// If no questions have been set up yet redirect to edit.php or display an error.
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if (!$quizobj->has_questions()) {
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if ($quizobj->has_capability('mod/quiz:manage')) {
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redirect($quizobj->edit_url());
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} else {
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print_error('cannotstartnoquestions', 'quiz', $quizobj->view_url());
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}
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}
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// Create an object to manage all the other (non-roles) access rules.
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$timenow = time();
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$accessmanager = $quizobj->get_access_manager($timenow);
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// Validate permissions for creating a new attempt and start a new preview attempt if required.
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list($currentattemptid, $attemptnumber, $lastattempt, $messages, $page) =
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quiz_validate_new_attempt($quizobj, $accessmanager, $forcenew, $page, true);
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// Check access.
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if (!$quizobj->is_preview_user() && $messages) {
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$output = $PAGE->get_renderer('mod_quiz');
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print_error('attempterror', 'quiz', $quizobj->view_url(),
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$output->access_messages($messages));
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}
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if ($accessmanager->is_preflight_check_required($currentattemptid)) {
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// Need to do some checks before allowing the user to continue.
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$mform = $accessmanager->get_preflight_check_form(
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$quizobj->start_attempt_url($page), $currentattemptid);
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if ($mform->is_cancelled()) {
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$accessmanager->back_to_view_page($PAGE->get_renderer('mod_quiz'));
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} else if (!$mform->get_data()) {
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// Form not submitted successfully, re-display it and stop.
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$PAGE->set_url($quizobj->start_attempt_url($page));
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$PAGE->set_title($quizobj->get_quiz_name());
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$accessmanager->setup_attempt_page($PAGE);
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$output = $PAGE->get_renderer('mod_quiz');
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if (empty($quizobj->get_quiz()->showblocks)) {
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$PAGE->blocks->show_only_fake_blocks();
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}
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echo $output->start_attempt_page($quizobj, $mform);
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die();
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}
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// Pre-flight check passed.
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$accessmanager->notify_preflight_check_passed($currentattemptid);
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}
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if ($currentattemptid) {
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if ($lastattempt->state == quiz_attempt::OVERDUE) {
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redirect($quizobj->summary_url($lastattempt->id));
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} else {
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redirect($quizobj->attempt_url($currentattemptid, $page));
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}
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}
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$attempt = quiz_prepare_and_start_new_attempt($quizobj, $attemptnumber, $lastattempt);
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// Redirect to the attempt page.
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redirect($quizobj->attempt_url($attempt->id, $page));
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