mod/lesson/action/addendofbranch.php

   1 <?php // $Id$
   2 /**
   3  * Action for adding an end of branch page
   4  *
   5  * @version $Id$
   6  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
   7  * @package lesson
   8  **/
   9     require_sesskey();
  10
  11     // first get the preceeding page
  12     $pageid = required_param('pageid', PARAM_INT);
  13
  14     $timenow = time();
  15
  16     // the new page is not the first page (end of branch always comes after an existing page)
  17     if (!$page = get_record("lesson_pages", "id", $pageid)) {
  18         error("Add end of branch: page record not found");
  19     }
  20     // chain back up to find the (nearest branch table)
  21     $btpageid = $pageid;
  22     if (!$btpage = get_record("lesson_pages", "id", $btpageid)) {
  23         error("Add end of branch: btpage record not found");
  24     }
  25     while (($btpage->qtype != LESSON_BRANCHTABLE) AND ($btpage->prevpageid > 0)) {
  26         $btpageid = $btpage->prevpageid;
  27         if (!$btpage = get_record("lesson_pages", "id", $btpageid)) {
  28             error("Add end of branch: btpage record not found");
  29         }
  30     }
  31     if ($btpage->qtype == LESSON_BRANCHTABLE) {
  32         $newpage = new stdClass;
  33         $newpage->lessonid = $lesson->id;
  34         $newpage->prevpageid = $pageid;
  35         $newpage->nextpageid = $page->nextpageid;
  36         $newpage->qtype = LESSON_ENDOFBRANCH;
  37         $newpage->timecreated = $timenow;
  38         $newpage->title = get_string("endofbranch", "lesson");
  39         $newpage->contents = get_string("endofbranch", "lesson");
  40         if (!$newpageid = insert_record("lesson_pages", $newpage)) {
  41             error("Insert page: new page not inserted");
  42         }
  43         // update the linked list...
  44         if (!set_field("lesson_pages", "nextpageid", $newpageid, "id", $pageid)) {
  45             error("Add end of branch: unable to update link");
  46         }
  47         if ($page->nextpageid) {
  48             // the new page is not the last page
  49             if (!set_field("lesson_pages", "prevpageid", $newpageid, "id", $page->nextpageid)) {
  50                 error("Insert page: unable to update previous link");
  51             }
  52         }
  53         // ..and the single "answer"
  54         $newanswer = new stdClass;
  55         $newanswer->lessonid = $lesson->id;
  56         $newanswer->pageid = $newpageid;
  57         $newanswer->timecreated = $timenow;
  58         $newanswer->jumpto = $btpageid;
  59         if(!$newanswerid = insert_record("lesson_answers", $newanswer)) {
  60             error("Add end of branch: answer record not inserted");
  61         }
  62
  63         lesson_set_message(get_string('addedanendofbranch', 'lesson'), 'notifysuccess');
  64     } else {
  65         lesson_set_message(get_string('nobranchtablefound', 'lesson'));
  66     }
  67
  68     redirect("$CFG->wwwroot/mod/lesson/edit.php?id=$cm->id");
  69 ?>