docs/mods/_standard/tests/take_test_q.php

   1 <?php
   2 /****************************************************************/
   3 /* ATutor                                                                                                               */
   4 /****************************************************************/
   5 /* Copyright (c) 2002-2010                                      */
   6 /* Inclusive Design Institute                                   */
   7 /* http://atutor.ca                                                                                             */
   8 /*                                                              */
   9 /* This program is free software. You can redistribute it and/or*/
  10 /* modify it under the terms of the GNU General Public License  */
  11 /* as published by the Free Software Foundation.                                */
  12 /****************************************************************/
  13 // $Id$
  14 define('AT_INCLUDE_PATH', '../../../include/');
  15 require(AT_INCLUDE_PATH.'vitals.inc.php');
  16 require(AT_INCLUDE_PATH.'../mods/_standard/tests/lib/test_result_functions.inc.php');
  17 require(AT_INCLUDE_PATH.'../mods/_standard/tests/classes/testQuestions.class.php');
  18
  19 $tid = intval($_REQUEST['tid']);
  20 if (isset($_REQUEST['cid']))
  21 {
  22         $cid = intval($_REQUEST['cid']);
  23         $cid_url = SEP.'cid='.$cid;
  24 }
  25
  26 if (isset($_REQUEST['gid']))
  27         $mid = $addslashes($_REQUEST['gid']);
  28 else
  29         $mid = $_SESSION['member_id'];
  30
  31 //make sure max attempts not reached, and still on going
  32 $sql            = "SELECT *, UNIX_TIMESTAMP(start_date) AS start_date, UNIX_TIMESTAMP(end_date) AS end_date FROM ".TABLE_PREFIX."tests WHERE test_id=".$tid." AND course_id=".$_SESSION['course_id'];
  33 $result= mysql_query($sql, $db);
  34 $test_row = mysql_fetch_assoc($result);
  35 /* check to make sure we can access this test: */
  36 if (!$test_row['guests'] && ($_SESSION['enroll'] == AT_ENROLL_NO || $_SESSION['enroll'] == AT_ENROLL_ALUMNUS)) {
  37         require(AT_INCLUDE_PATH.'header.inc.php');
  38         $msg->printInfos('NOT_ENROLLED');
  39
  40         require(AT_INCLUDE_PATH.'footer.inc.php');
  41         exit;
  42 }
  43
  44 if (!$test_row['guests'] && !authenticate_test($tid)) {
  45         header('Location: '.url_rewrite('mods/_standard/tests/my_tests.php', AT_PRETTY_URL_IS_HEADER));
  46         exit;
  47 }
  48
  49 // checks one/all questions per page, and forward user to the correct one
  50 if (!$test_row['display']) {
  51         header('Location: '.url_rewrite('mods/_standard/tests/take_test.php?tid='.$tid.$cid_url, AT_PRETTY_URL_IS_HEADER));
  52 }
  53
  54 $out_of = $test_row['out_of'];
  55
  56 $sql    = "SELECT COUNT(*) AS num_questions FROM ".TABLE_PREFIX."tests_questions_assoc WHERE test_id=$tid";
  57 $result = mysql_query($sql, $db);
  58 $row = mysql_fetch_assoc($result);
  59 if (!$test_row['random'] || $test_row['num_questions'] > $row['num_questions']) {
  60         $test_row['num_questions'] = $row['num_questions'];
  61 }
  62
  63 $sql = "SELECT COUNT(*) AS cnt FROM ".TABLE_PREFIX."tests_results WHERE status=1 AND test_id=".$tid." AND member_id='".$mid."'";
  64 $takes_result= mysql_query($sql, $db) or die(mysql_error());
  65 $takes = mysql_fetch_assoc($takes_result);
  66
  67 if ( (($test_row['start_date'] > time()) || ($test_row['end_date'] < time())) ||
  68    ( ($test_row['num_takes'] != AT_TESTS_TAKE_UNLIMITED) && ($takes['cnt'] >= $test_row['num_takes']) )  ) {
  69         require(AT_INCLUDE_PATH.'header.inc.php');
  70         $msg->printInfos('MAX_ATTEMPTS');
  71         require(AT_INCLUDE_PATH.'footer.inc.php');
  72         exit;
  73 }
  74
  75 if (!isset($_GET['pos'])) {
  76         $pos = 0; // first question
  77 } else {
  78         $pos = abs($_GET['pos']);
  79 }
  80
  81 $max_pos = 0;
  82
  83 // get and check for a valid result_id. if there is none then get all the questions and insert them as in progress.
  84 // note: for guests without guest information, the result_id is stored in session, but no need to really know that here;
  85 //       for guests with guest information, always start a new test.
  86 if (isset($_REQUEST['gid']))
  87         $result_id = 0;
  88 else
  89         $result_id = get_test_result_id($tid, $max_pos);
  90
  91 // set position to allow users to return to a test they have partially completed, and continue from where they left of.
  92 if (!isset($_GET['pos']) && $result_id > 0)
  93 {
  94         $sql = "SELECT COUNT(*) total_questions FROM ".TABLE_PREFIX."tests_answers WHERE result_id = ". $result_id;
  95         $total_result = mysql_query($sql, $db) or die(mysql_error());
  96         $total = mysql_fetch_assoc($total_result);
  97
  98         $sql = "SELECT COUNT(*) pos FROM ".TABLE_PREFIX."tests_answers WHERE result_id = ". $result_id ." AND answer <> ''";
  99         $answer_result = mysql_query($sql, $db) or die(mysql_error());
 100         $answer = mysql_fetch_assoc($answer_result);
 101
 102         // if user answered all the questions without cliking last "next" button, resume test at the last question
 103         $pos = ($total['total_questions'] == $answer['pos']) ? (--$answer['pos']) : $answer['pos'];
 104 }
 105
 106 if ($result_id == 0) {
 107         // there is no test in progress, yet.
 108         // init this test.
 109
 110         // simple safety op to make sure nothing is being posted (as it shouldn't!)
 111         // $_POST = array(); // don't need this because of the else-if
 112         // basically, shouldn't be able to post to this page if there isn't a valid result_id first (how can someone post an answer
 113         // to a question they haven't viewed? [unless they're trying to 'hack' something])
 114
 115         $result_id = init_test_result_questions($tid, (bool) $test_row['random'], $test_row['num_questions'], $mid);
 116
 117         if (!$_SESSION['member_id']) {
 118                 // this is a guest, so we store the result_id in SESSION
 119                 $_SESSION['test_result_id'] = $result_id;
 120         }
 121
 122         $pos = 0; // force to always start at the first question
 123
 124 } else if (isset($_POST['next']) || isset($_POST['previous'])) {
 125         // if the test isn't time limited, then what happens when only a few questions are answered? the test result
 126         // will be inconsistant.
 127         // need to keep track of the max(pos) answered, so that we know if a question is being re-answered.
 128         // store 'max_pos' in session or db or form?
 129
 130         // assuming only one question is displayed
 131         $question_id = intval(key($_POST['answers']));
 132
 133         // get the old score (incase this question is being re-answered)
 134         $sql = "SELECT score FROM ".TABLE_PREFIX."tests_answers WHERE result_id=$result_id AND question_id=$question_id";
 135         $result = mysql_query($sql, $db);
 136         $row = mysql_fetch_assoc($result);
 137         $old_score = $row['score'];
 138
 139         $score = 0;
 140
 141         $sql = "SELECT TQA.weight, TQA.question_id, TQ.type, TQ.answer_0, TQ.answer_1, TQ.answer_2, TQ.answer_3, TQ.answer_4, TQ.answer_5, TQ.answer_6, TQ.answer_7, TQ.answer_8, TQ.answer_9 FROM ".TABLE_PREFIX."tests_questions_assoc TQA INNER JOIN ".TABLE_PREFIX."tests_questions TQ USING (question_id) WHERE TQA.test_id=$tid AND TQA.question_id=$question_id";
 142         $result = mysql_query($sql, $db);
 143
 144         if ($row = mysql_fetch_assoc($result)) {
 145                 if (isset($_POST['answers'][$row['question_id']])) {
 146                         $obj = TestQuestions::getQuestion($row['type']);
 147                         $score = $obj->mark($row);
 148
 149                         $sql    = "UPDATE ".TABLE_PREFIX."tests_answers SET answer='{$_POST[answers][$row[question_id]]}', score='$score' WHERE result_id=$result_id AND question_id=$row[question_id]";
 150                         mysql_query($sql, $db);
 151
 152                         if (is_null($score) && $test_row['result_release']==AT_RELEASE_MARKED)
 153                                 $_REQUEST['efs'] = 1; // set final score to empty if there's any unmarked question and release option is "once quiz submitted and all questions are marked"
 154                 }
 155         }
 156
 157         $pos++;
 158
 159         if ($_REQUEST['efs']) // set final score to empty if there's any unmarked question and release option is "once quiz submitted and all questions are marked"
 160         {
 161                 $sql    = "UPDATE ".TABLE_PREFIX."tests_results SET final_score=null, date_taken=date_taken, end_time=NOW(), max_pos=$pos WHERE result_id=$result_id";
 162                 $result = mysql_query($sql, $db);
 163         }
 164         // update the final score
 165         // update status to complate to fix refresh test issue.
 166         else if ($pos > $max_pos) {
 167                 $sql    = "UPDATE ".TABLE_PREFIX."tests_results SET final_score=final_score + $score, date_taken=date_taken, end_time=NOW(), max_pos=$pos WHERE result_id=$result_id";
 168                 $result = mysql_query($sql, $db);
 169         } else {
 170                 // this question has already been answered, so we have to re-mark it, which means finding the OLD score for this question and adjusting
 171                 // $score with the positive or negative difference.
 172                 // no need to update max_pos b/c we're only updating a previously answered question.
 173
 174                 $score = $old_score - $score;
 175
 176                 $sql    = "UPDATE ".TABLE_PREFIX."tests_results SET final_score=final_score - $score, date_taken=date_taken, end_time=NOW() WHERE result_id=$result_id";
 177                 $result = mysql_query($sql, $db);
 178         }
 179
 180         if (isset($_POST['previous'])) {
 181                 $pos-=2;
 182                 if ($pos < 0) {
 183                         $pos = 0;
 184                 }
 185         }
 186
 187         if ($pos >= $test_row['num_questions']) {
 188                 // end of the test.
 189                 $sql    = "UPDATE ".TABLE_PREFIX."tests_results SET status=1, date_taken=date_taken, end_time=NOW() WHERE result_id=$result_id";
 190                 $result = mysql_query($sql, $db);
 191
 192                 $msg->addFeedback('ACTION_COMPLETED_SUCCESSFULLY');
 193                 if ((!$_SESSION['enroll'] && !isset($cid)) || $test_row['result_release']==AT_RELEASE_IMMEDIATE) {
 194                         header('Location: '.url_rewrite('mods/_standard/tests/view_results.php?tid='.$tid.SEP.'rid='.$result_id.$cid_url, AT_PRETTY_URL_IS_HEADER));
 195                         exit;
 196                 }
 197
 198                 if (isset($cid)) header('Location: '.url_rewrite('content.php?cid='.$cid, AT_PRETTY_URL_IS_HEADER));
 199                 else header('Location: '.url_rewrite('mods/_standard/tests/my_tests.php', AT_PRETTY_URL_IS_HEADER));
 200                 exit;
 201         } // else:
 202
 203         header('Location: '.url_rewrite('mods/_standard/tests/take_test_q.php?tid='.$tid.SEP.'pos='.$pos.SEP.'efs='.$_REQUEST['efs'].$cid_url, AT_PRETTY_URL_IS_HEADER));
 204         exit;
 205 }
 206
 207 if (defined('AT_FORCE_GET_FILE') && AT_FORCE_GET_FILE) {
 208         $content_base_href = 'get.php/';
 209 } else {
 210         $course_base_href = 'content/' . $_SESSION['course_id'] . '/';
 211 }
 212
 213 require(AT_INCLUDE_PATH.'header.inc.php');
 214
 215 /* Retrieve the content_id of this test */
 216 $num_questions = $test_row['num_questions'];
 217 $content_id = $test_row['content_id'];
 218 $anonymous = $test_row['anonymous'];
 219 $instructions = $test_row['instructions'];
 220 $title = $test_row['title'];
 221
 222 $_letters = array(_AT('A'), _AT('B'), _AT('C'), _AT('D'), _AT('E'), _AT('F'), _AT('G'), _AT('H'), _AT('I'), _AT('J'));
 223
 224 // this is a kludge to get the question number incremented.
 225 // a diff approach could be to pass the position to the display() method.
 226 for ($i = 0; $i < $pos; $i++) {
 227         TestQuestionCounter(true);
 228 }
 229
 230 // retrieve the test questions that were saved to `tests_answers`
 231 if ($test_row['random']) {
 232         $sql    = "SELECT R.*, A.*, Q.* FROM ".TABLE_PREFIX."tests_answers R INNER JOIN ".TABLE_PREFIX."tests_questions_assoc A USING (question_id) INNER JOIN ".TABLE_PREFIX."tests_questions Q USING (question_id) WHERE R.result_id=$result_id AND A.test_id=$tid ORDER BY Q.question_id LIMIT $pos, 1";
 233 } else {
 234         $sql    = "SELECT R.*, A.*, Q.* FROM ".TABLE_PREFIX."tests_answers R INNER JOIN ".TABLE_PREFIX."tests_questions_assoc A USING (question_id) INNER JOIN ".TABLE_PREFIX."tests_questions Q USING (question_id) WHERE R.result_id=$result_id AND A.test_id=$tid ORDER BY A.ordering, Q.question_id LIMIT $pos, 1";
 235 }
 236 $result = mysql_query($sql, $db);
 237 $question_row = mysql_fetch_assoc($result);
 238
 239 if (!$result || !$question_row) {
 240         echo '<p>'._AT('no_questions').'</p>';
 241         require(AT_INCLUDE_PATH.'footer.inc.php');
 242         exit;
 243 }
 244
 245 ?>
 246 <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>?pos=<?php echo $pos; ?>">
 247 <input type="hidden" name="tid" value="<?php echo $tid; ?>" />
 248 <?php if (isset($_REQUEST['cid'])) {?> <input type="hidden" name="cid" value="<?php echo $cid; ?>" /> <?php }?>
 249
 250 <div class="input-form" style="width:95%">
 251
 252         <fieldset class="group_form"><legend class="group_form"><?php echo $title ?> (<?php echo _AT('question').' '. ($pos+1).'/'.$test_row['num_questions']; ?>)</legend>
 253         <?php if ($_REQUEST['efs']){?>
 254         <input type="hidden" name="efs" value=<?php echo $_REQUEST['efs']; ?> />
 255         <?php }?>
 256
 257         <?php
 258         // retrieve the answer to re-populate the form (so we can edit our answer)
 259         $sql = "SELECT answer FROM ".TABLE_PREFIX."tests_answers WHERE result_id=$result_id AND question_id=$question_row[question_id]";
 260         $result = mysql_query($sql, $db);
 261         $row = mysql_fetch_assoc($result);
 262
 263         $obj = TestQuestions::getQuestion($question_row['type']);
 264         $obj->display($question_row, $row['answer']);
 265
 266         ?>
 267         <div class="row buttons">
 268                  <div style="display:none"><input type="submit" value="<?php echo _AT('next'); ?>" name="next"/></div>
 269                 <?php if ($pos > 0): ?>
 270                         <input type="submit" name="previous" value="<?php echo _AT('previous'); ?>" />
 271                 <?php endif; ?>
 272                 <?php if (($pos+1) == $test_row['num_questions']): ?>
 273                         <input type="submit" name="next" value="<?php echo _AT('submit'); ?>" accesskey="s" onclick="confirmSubmit(this, '<?php echo $addslashes(_AT("test_confirm_submit")); ?>'); return false;"/>
 274                 <?php else: ?>
 275                         <input type="submit" name="next" value="<?php echo _AT('next'); ?>" accesskey="s" />
 276                 <?php endif; ?>
 277         </div>
 278         </fieldset>
 279 </div>
 280 </form>
 281 <script type="text/javascript" src="<?php echo $_base_href;?>/mods/_standard/tests/lib/take_test.js">
 282 <?php require(AT_INCLUDE_PATH.'footer.inc.php'); ?>