docs/mods/_standard/tests/preview.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/classes/testQuestions.class.php');
  17
  18 authenticate(AT_PRIV_TESTS);
  19 $_letters = array(_AT('A'), _AT('B'), _AT('C'), _AT('D'), _AT('E'), _AT('F'), _AT('G'), _AT('H'), _AT('I'), _AT('J'));
  20
  21 if ($_POST['back']) {
  22         header('Location: index.php');
  23         exit;
  24 }
  25
  26 if (defined('AT_FORCE_GET_FILE') && AT_FORCE_GET_FILE) {
  27         $content_base_href = 'get.php/';
  28 } else {
  29         $content_base_href = 'content/' . $_SESSION['course_id'] . '/';
  30 }
  31
  32 require(AT_INCLUDE_PATH.'header.inc.php');
  33
  34 $tid = intval($_GET['tid']);
  35
  36 /* Retrieve the content_id of this test */
  37 $sql = "SELECT title, random, num_questions, instructions FROM ".TABLE_PREFIX."tests WHERE test_id=$tid";
  38 $result = mysql_query($sql, $db);
  39 if (!($test_row = mysql_fetch_assoc($result))) {
  40         $msg->printErrors('ITEM_NOT_FOUND');
  41         require (AT_INCLUDE_PATH.'footer.inc.php');
  42         exit;
  43 }
  44 $num_questions = $test_row['num_questions'];
  45 $rand_err = false;
  46
  47 if ($row['random']) {
  48         /* !NOTE! this is a really awful way of randomizing questions !NOTE! */
  49
  50         /* Retrieve 'num_questions' question_id randomly choosed from
  51         those who are related to this content_id*/
  52         $sql    = "SELECT question_id FROM ".TABLE_PREFIX."tests_questions_assoc WHERE test_id=$tid";
  53         $result = mysql_query($sql, $db);
  54         $i = 0;
  55         $row2 = mysql_fetch_assoc($result);
  56         /* Store all related question in cr_questions */
  57         while ($row2['question_id'] != '') {
  58                 $cr_questions[$i] = $row2['question_id'];
  59                 $row2 = mysql_fetch_assoc($result);
  60                 $i++;
  61         }
  62         if ($i < $num_questions) {
  63                 /* this if-statement is misleading. */
  64                 /* one should still be able to preview a test before all its questions have been added. */
  65                 /* ie. preview as questions are added. */
  66                 /* bug # 0000615 */
  67                 $rand_err = true;
  68         } else {
  69                 /* Randomly choose only 'num_question' question */
  70                 $random_idx = rand(0, $i-1);
  71                 $random_id_string = $cr_questions[$random_idx];
  72                 $j = 0;
  73                 $extracted[$j] = $random_idx;
  74                 $j++;
  75                 $num_questions--;
  76                 while ($num_questions > 0) {
  77                         $done = false;
  78                         while (!$done) {
  79                                 $random_idx = rand(0, $i-1);
  80                                 $done = true;
  81                                 for ($k=0;$k<$j;$k++) {
  82                                         if ($extracted[$k]== $random_idx) {
  83                                                 $done = false;
  84                                                 break;
  85                                         }
  86                                 }
  87                         }
  88                         $extracted[$j] = $random_idx;
  89                         $j++;
  90                         $random_id_string = $random_id_string.','.$cr_questions[$random_idx];
  91                         $num_questions--;
  92                 }
  93                 $sql = "SELECT TQ.*, TQA.* FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQ.course_id=$_SESSION[course_id] AND TQA.test_id=$tid AND TQA.question_id IN ($random_id_string) ORDER BY TQA.ordering, TQA.question_id";
  94         }
  95 } else {
  96         $sql    = "SELECT TQ.*, TQA.* FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQ.course_id=$_SESSION[course_id] AND TQA.test_id=$tid ORDER BY TQA.ordering, TQA.question_id";
  97 }
  98 $result = mysql_query($sql, $db);
  99 $count = 1;
 100 echo '<form method="post" action="'.$_SERVER['PHP_SELF'].'" name="preview">';
 101
 102 if (($row = mysql_fetch_assoc($result)) && !$rand_err) {
 103         ?>
 104         <div class="input-form" style="width:95%">
 105         <div class="row"><h2><?php echo $test_row['title']; ?></h2></div>
 106
 107
 108         <?php if ($test_row['instructions'] != ''): ?>
 109                 <div style="background-color: #f3f3f3; padding: 5px 10px; margin: 0px; border-top: 1px solid">
 110                         <strong><?php echo _AT('instructions'); ?></strong>
 111                 </div>
 112                 <div class="row" style="padding-bottom: 20px"><?php echo $test_row['instructions']; ?></div>
 113         <?php endif; ?>
 114
 115         <?php
 116         do {
 117                 $o = TestQuestions::getQuestion($row['type']);
 118                 $o->display($row);
 119         } while ($row = mysql_fetch_assoc($result));
 120         ?>
 121         <div class="row buttons">
 122                 <input type="submit" value="<?php echo _AT('back'); ?>" name="back" />
 123         </div>
 124
 125         </div>
 126         </form>
 127 <script type="text/javascript">
 128 //<!--
 129 function iframeSetHeight(id, height) {
 130         document.getElementById("qframe" + id).style.height = (height + 20) + "px";
 131 }
 132 //-->
 133 </script>
 134 <?php
 135 } else {
 136         $msg->printErrors('NO_QUESTIONS');
 137 }
 138
 139
 140 require(AT_INCLUDE_PATH.'footer.inc.php');
 141 ?>