lp_ajax_switch_item.php 9.2 KB

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  1. <?php
  2. /* For licensing terms, see /license.txt */
  3. /**
  4. * This script contains the server part of the xajax interaction process. The client part is located
  5. * in lp_api.php or other api's.
  6. * This is a first attempt at using xajax and AJAX in general, so the code might be a bit unsettling.
  7. * @package chamilo.learnpath
  8. * @author Yannick Warnier <ywarnier@beeznest.org>
  9. */
  10. /**
  11. * Code
  12. */
  13. // Flag to allow for anonymous user - needs to be set before global.inc.php
  14. $use_anonymous = true;
  15. // Name of the language file that needs to be included
  16. $language_file[] = 'learnpath';
  17. require_once '../inc/global.inc.php';
  18. /**
  19. * Get one item's details
  20. * @param integer LP ID
  21. * @param integer user ID
  22. * @param integer View ID
  23. * @param integer Current item ID
  24. * @param integer New item ID
  25. */
  26. function switch_item_details($lp_id, $user_id, $view_id, $current_item, $next_item)
  27. {
  28. $debug = 0;
  29. $return = '';
  30. if ($debug > 0) {
  31. error_log('In xajax_switch_item_details('.$lp_id.','.$user_id.','.$view_id.','.$current_item.','.$next_item.')', 0);
  32. }
  33. //$objResponse = new xajaxResponse();
  34. /* $item_id may be one of:
  35. * -'next'
  36. * -'previous'
  37. * -'first'
  38. * -'last'
  39. * - a real item ID
  40. */
  41. require_once 'learnpath.class.php';
  42. require_once 'scorm.class.php';
  43. require_once 'aicc.class.php';
  44. require_once 'learnpathItem.class.php';
  45. require_once 'scormItem.class.php';
  46. require_once 'aiccItem.class.php';
  47. $mylp = '';
  48. if (isset($_SESSION['lpobject'])) {
  49. if ($debug > 1) {
  50. error_log('$_SESSION[lpobject] is set', 0);
  51. }
  52. $oLP = unserialize($_SESSION['lpobject']);
  53. if (!is_object($oLP)) {
  54. if ($debug > 1) {
  55. error_log(print_r($oLP, true), 0);
  56. }
  57. if ($debug > 2) {
  58. error_log('Building new lp', 0);
  59. }
  60. unset($oLP);
  61. $code = api_get_course_id();
  62. $mylp = new learnpath($code, $lp_id, $user_id);
  63. } else {
  64. if ($debug > 1) {
  65. error_log('Reusing session lp', 0);
  66. }
  67. $mylp = $oLP;
  68. }
  69. }
  70. $check_attempts = $mylp->check_item_attempts($next_item);
  71. $new_item_id = 0;
  72. switch ($next_item) {
  73. case 'next':
  74. $mylp->set_current_item($current_item);
  75. $mylp->next();
  76. $new_item_id = $mylp->get_current_item_id();
  77. if ($debug > 1) {
  78. error_log('In {next} - next item is '.$new_item_id.'(current: '.$current_item.')', 0);
  79. }
  80. break;
  81. case 'previous':
  82. $mylp->set_current_item($current_item);
  83. $mylp->previous();
  84. $new_item_id = $mylp->get_current_item_id();
  85. if ($debug > 1) {
  86. error_log('In {previous} - next item is '.$new_item_id.'(current: '.$current_item.')', 0);
  87. }
  88. break;
  89. case 'first':
  90. $mylp->set_current_item($current_item);
  91. $mylp->first();
  92. $new_item_id = $mylp->get_current_item_id();
  93. if ($debug > 1) {
  94. error_log('In {first} - next item is '.$new_item_id.'(current: '.$current_item.')', 0);
  95. }
  96. break;
  97. case 'last':
  98. break;
  99. default:
  100. // Should be filtered to check it's not hacked.
  101. if ($next_item == $current_item) {
  102. // If we're opening the same item again.
  103. $mylp->items[$current_item]->restart();
  104. }
  105. $new_item_id = $next_item;
  106. $mylp->set_current_item($new_item_id);
  107. if ($debug > 1) {
  108. error_log('In {default} - next item is '.$new_item_id.'(current: '.$current_item.')', 0);
  109. }
  110. break;
  111. }
  112. if ($check_attempts) {
  113. $mylp->start_current_item(true);
  114. }
  115. if ($check_attempts == true && $mylp->force_commit) {
  116. $mylp->save_current();
  117. }
  118. if (is_object($mylp->items[$new_item_id])) {
  119. $mylpi = $mylp->items[$new_item_id];
  120. } else {
  121. if ($debug > 1) {
  122. error_log('In switch_item_details - generating new item object', 0);
  123. }
  124. $mylpi = new learnpathItem($new_item_id, $user_id);
  125. $mylpi->set_lp_view($view_id);
  126. }
  127. /*
  128. * now get what's needed by the SCORM API:
  129. * -score
  130. * -max
  131. * -min
  132. * -lesson_status
  133. * -session_time
  134. * -suspend_data
  135. */
  136. $myscore = $mylpi->get_score();
  137. $mymax = $mylpi->get_max();
  138. if ($mymax === '') {
  139. $mymax = "''";
  140. }
  141. $mymin = $mylpi->get_min();
  142. $mylesson_status = $mylpi->get_status();
  143. $mylesson_location = $mylpi->get_lesson_location();
  144. $mytotal_time = $mylpi->get_scorm_time('js');
  145. $mymastery_score = $mylpi->get_mastery_score();
  146. $mymax_time_allowed = $mylpi->get_max_time_allowed();
  147. $mylaunch_data = $mylpi->get_launch_data();
  148. $mysession_time = $mylpi->get_total_time();
  149. $mysuspend_data = $mylpi->get_suspend_data();
  150. $mylesson_location = $mylpi->get_lesson_location();
  151. $myic = $mylpi->get_interactions_count();
  152. $myistring = '';
  153. for ($i = 0; $i < $myic; $i++) {
  154. $myistring .= ",[".$i.",'','','','','','','']";
  155. }
  156. if (!empty($myistring)) {
  157. $myistring = substr($myistring, 1);
  158. }
  159. /*
  160. * The following lines should reinitialize the values for the SCO
  161. * However, due to many complications, we are now relying more on the
  162. * LMSInitialize() call and its underlying lp_ajax_initialize.php call
  163. * so this code is technically deprecated (but the change of item_id should
  164. * remain). However, due to numerous technical issues with SCORM, we prefer
  165. * leaving it as a double-lock security. If removing, please test carefully
  166. * with both SCORM and proper learning path tracking.
  167. */
  168. $return .=
  169. "olms.score=".$myscore.";".
  170. "olms.max=".$mymax.";".
  171. "olms.min=".$mymin.";".
  172. "olms.lesson_status='".$mylesson_status."';".
  173. "olms.lesson_location='".$mylesson_location."';".
  174. "olms.session_time='".$mysession_time."';".
  175. "olms.suspend_data='".$mysuspend_data."';".
  176. "olms.total_time = '".$mytotal_time."';".
  177. "olms.mastery_score = '".$mymastery_score."';".
  178. "olms.max_time_allowed = '".$mymax_time_allowed."';".
  179. "olms.launch_data = '".$mylaunch_data."';".
  180. "olms.interactions = new Array(".$myistring.");".
  181. "olms.item_objectives = new Array();".
  182. "olms.G_lastError = 0;".
  183. "olms.G_LastErrorMessage = 'No error';";
  184. /*
  185. * and re-initialise the rest
  186. * -lms_lp_id
  187. * -lms_item_id
  188. * -lms_old_item_id
  189. * -lms_new_item_id
  190. * -lms_initialized
  191. * -lms_progress_bar_mode
  192. * -lms_view_id
  193. * -lms_user_id
  194. */
  195. $mytotal = $mylp->get_total_items_count_without_chapters();
  196. $mycomplete = $mylp->get_complete_items_count();
  197. $myprogress_mode = $mylp->get_progress_bar_mode();
  198. $myprogress_mode = ($myprogress_mode == '' ? '%' : $myprogress_mode);
  199. $mynext = $mylp->get_next_item_id();
  200. $myprevious = $mylp->get_previous_item_id();
  201. $myitemtype = $mylpi->get_type();
  202. $mylesson_mode = $mylpi->get_lesson_mode();
  203. $mycredit = $mylpi->get_credit();
  204. $mylaunch_data = $mylpi->get_launch_data();
  205. $myinteractions_count = $mylpi->get_interactions_count();
  206. $myobjectives_count = $mylpi->get_objectives_count();
  207. $mycore_exit = $mylpi->get_core_exit();
  208. $return .=
  209. //"saved_lesson_status='not attempted';" .
  210. "olms.lms_lp_id=".$lp_id.";".
  211. "olms.lms_item_id=".$new_item_id.";".
  212. "olms.lms_old_item_id=0;".
  213. //"lms_been_synchronized=0;" .
  214. "olms.lms_initialized=0;".
  215. //"lms_total_lessons=".$mytotal.";" .
  216. //"lms_complete_lessons=".$mycomplete.";" .
  217. //"lms_progress_bar_mode='".$myprogress_mode."';" .
  218. "olms.lms_view_id=".$view_id.";".
  219. "olms.lms_user_id=".$user_id.";".
  220. "olms.next_item=".$new_item_id.";".// This one is very important to replace possible literal strings.
  221. "olms.lms_next_item=".$mynext.";".
  222. "olms.lms_previous_item=".$myprevious.";".
  223. "olms.lms_item_type = '".$myitemtype."';".
  224. "olms.lms_item_credit = '".$mycredit."';".
  225. "olms.lms_item_lesson_mode = '".$mylesson_mode."';".
  226. "olms.lms_item_launch_data = '".$mylaunch_data."';".
  227. "olms.lms_item_interactions_count = '".$myinteractions_count."';".
  228. "olms.lms_item_objectives_count = '".$myinteractions_count."';".
  229. "olms.lms_item_core_exit = '".$mycore_exit."';".
  230. "olms.asset_timer = 0;";
  231. $return .= "update_toc('unhighlight','".$current_item."');".
  232. "update_toc('highlight','".$new_item_id."');".
  233. "update_toc('$mylesson_status','".$new_item_id."');".
  234. "update_progress_bar('$mycomplete','$mytotal','$myprogress_mode');";
  235. $mylp->set_error_msg('');
  236. $mylp->prerequisites_match(); // Check the prerequisites are all complete.
  237. if ($debug > 1) {
  238. error_log('Prereq_match() returned '.htmlentities($mylp->error), 0);
  239. }
  240. $_SESSION['scorm_item_id'] = $new_item_id; // Save the new item ID for the exercise tool to use.
  241. $_SESSION['lpobject'] = serialize($mylp);
  242. return $return;
  243. }
  244. echo switch_item_details($_REQUEST['lid'], $_REQUEST['uid'], $_REQUEST['vid'], $_REQUEST['iid'], $_REQUEST['next']);