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<?PHP // $Id: lesson.php, v 1.0 25 Jan 2004
/*************************************************
ACTIONS handled are:
addbranchtable
addendofbranch
addpage
confirmdelete
continue
delete
editpage
insertpage
move
moveit
updatepage
************************************************/
require("../../config.php");
require("lib.php");
require_variable($id); // Course Module ID
// get some esential stuff...
if (! $cm = get_record("course_modules", "id", $id)) {
error("Course Module ID was incorrect");
}
if (! $course = get_record("course", "id", $cm->course)) {
error("Course is misconfigured");
}
if (! $lesson = get_record("lesson", "id", $cm->instance)) {
error("Course module is incorrect");
}
require_login($course->id);
// set up some general variables
$usehtmleditor = can_use_html_editor();
$navigation = "";
if ($course->category) {
$navigation = "<A HREF=\"../../course/view.php?id=$course->id\">$course->shortname</A> ->";
}
$strlessons = get_string("modulenameplural", "lesson");
$strlesson = get_string("modulename", "lesson");
$strlessonname = $lesson->name;
// ... print the header and...
print_header("$course->shortname: $lesson->name", "$course->fullname",
"$navigation <A HREF=index.php?id=$course->id>$strlessons</A> ->
<A HREF=\"view.php?id=$cm->id\">$lesson->name</A>",
"", "", true);
//...get the action
require_variable($action);
/************** add branch table ************************************/
if ($action == 'addbranchtable' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
// first get the preceeding page
$pageid = $_GET['pageid'];
// set of jump array
$jump[0] = get_string("thispage", "lesson");
$jump[LESSON_NEXTPAGE] = get_string("nextpage", "lesson");
$jump[LESSON_EOL] = get_string("endoflesson", "lesson");
if (!$apageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
error("Add page: first page not found");
}
while (true) {
if ($apageid) {
$title = get_field("lesson_pages", "title", "id", $apageid);
$jump[$apageid] = $title;
$apageid = get_field("lesson_pages", "nextpageid", "id", $apageid);
} else {
// last page reached
break;
}
}
// give teacher a blank proforma
print_heading_with_help(get_string("addabranchtable", "lesson"), "overview", "lesson");
?>
<form name="form" method="post" action="lesson.php">
<input type="hidden" name="id" value="<?PHP echo $cm->id ?>">
<input type="hidden" name="action" value="insertpage">
<input type="hidden" name="pageid" value="<?PHP echo $_GET['pageid'] ?>">
<input type="hidden" name="qtype" value="<?PHP echo LESSON_BRANCHTABLE ?>">
<center><table cellpadding=5 border=1>
<tr><td align="center">
<tr valign="top">
<td><b><?php print_string("pagetitle", "lesson"); ?>:</b><br />
<input type="text" name="title" size="80" maxsize="255" value=""></td></tr>
<?PHP
echo "<tr><td><b>";
echo get_string("pagecontents", "lesson").":</b><br />\n";
print_textarea($usehtmleditor, 25,70, 630, 400, "contents");
echo "</td></tr>\n";
for ($i = 0; $i < $lesson->maxanswers; $i++) {
$iplus1 = $i + 1;
echo "<tr><td><b>".get_string("description", "lesson")." $iplus1:</b><br />\n";
print_textarea($usehtmleditor, 20, 70, 630, 300, "answer[$i]");
echo "</td></tr>\n";
echo "<tr><td><B>".get_string("jump", "lesson")." $iplus1:</b> \n";
if ($i) {
// answers 2, 3, 4... jumpto this page
lesson_choose_from_menu($jump, "jumpto[$i]", 0, "");
} else {
// answer 1 jumpto next page
lesson_choose_from_menu($jump, "jumpto[$i]", LESSON_NEXTPAGE, "");
}
helpbutton("jumpto", get_string("jump", "lesson"), "lesson");
echo "</td></tr>\n";
}
use_html_editor();
// close table and form
?>
</table><br />
<input type="submit" value="<?php print_string("addabranchtable", "lesson") ?>">
<input type="submit" name="cancel" value="<?php print_string("cancel") ?>">
</center>
</form>
<?PHP
}
/************** add end of branch ************************************/
elseif ($action == 'addendofbranch' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
// first get the preceeding page
$pageid = $_GET['pageid'];
$timenow = time();
// the new page is not the first page (end of branch always comes after an existing page)
if (!$page = get_record("lesson_pages", "id", $pageid)) {
error("Add end of branch: page record not found");
}
// chain back up to find the (nearest branch table)
$btpageid = $pageid;
if (!$btpage = get_record("lesson_pages", "id", $btpageid)) {
error("Add end of branch: btpage record not found");
}
while (($btpage->qtype != LESSON_BRANCHTABLE) AND ($btpage->prevpageid > 0)) {
$btpageid = $btpage->prevpageid;
if (!$btpage = get_record("lesson_pages", "id", $btpageid)) {
error("Add end of branch: btpage record not found");
}
}
if ($btpage->qtype == LESSON_BRANCHTABLE) {
$newpage->lessonid = $lesson->id;
$newpage->prevpageid = $pageid;
$newpage->nextpageid = $page->nextpageid;
$newpage->qtype = LESSON_ENDOFBRANCH;
$newpage->timecreated = $timenow;
$newpage->title = get_string("endofbranch", "lesson");
$newpage->contents = get_string("endofbranch", "lesson");
if (!$newpageid = insert_record("lesson_pages", $newpage)) {
error("Insert page: new page not inserted");
}
// update the linked list...
if (!set_field("lesson_pages", "nextpageid", $newpageid, "id", $pageid)) {
error("Add end of branch: unable to update link");
}
if ($page->nextpageid) {
// the new page is not the last page
if (!set_field("lesson_pages", "prevpageid", $newpageid, "id", $page->nextpageid)) {
error("Insert page: unable to update previous link");
}
}
// ..and the single "answer"
$newanswer->lessonid = $lesson->id;
$newanswer->pageid = $newpageid;
$newanswer->timecreated = $timenow;
$newanswer->jumpto = $btpageid;
if(!$newanswerid = insert_record("lesson_answers", $newanswer)) {
error("Add end of branch: answer record not inserted");
}
redirect("view.php?id=$cm->id", get_string("ok"));
} else {
notice(get_string("nobranchtablefound", "lesson"), "view.php?id=$cm->id");
}
}
/************** add page ************************************/
elseif ($action == 'addpage' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
// first get the preceeding page
$pageid = $_GET['pageid'];
// set of jump array
$jump[0] = get_string("thispage", "lesson");
$jump[LESSON_NEXTPAGE] = get_string("nextpage", "lesson");
$jump[LESSON_EOL] = get_string("endoflesson", "lesson");
if (!$apageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
error("Add page: first page not found");
}
while (true) {
if ($apageid) {
$title = get_field("lesson_pages", "title", "id", $apageid);
$jump[$apageid] = $title;
$apageid = get_field("lesson_pages", "nextpageid", "id", $apageid);
} else {
// last page reached
break;
}
}
// give teacher a blank proforma
print_heading_with_help(get_string("addaquestionpage", "lesson"), "overview", "lesson");
?>
<form name="form" method="post" action="lesson.php">
<input type="hidden" name="id" value="<?PHP echo $cm->id ?>">
<input type="hidden" name="action" value="insertpage">
<input type="hidden" name="pageid" value="<?PHP echo $_GET['pageid'] ?>">
<center><table cellpadding=5 border=1>
<tr><td align="center">
<tr valign="top">
<td><b><?php print_string("pagetitle", "lesson"); ?>:</b><br />
<input type="text" name="title" size="80" maxsize="255" value=""></td></tr>
<?PHP
echo "<tr><td><b>";
echo get_string("pagecontents", "lesson").":</b><br />\n";
print_textarea($usehtmleditor, 25,70, 630, 400, "contents");
use_html_editor("contents");
echo "</td></tr>\n";
echo "<tr><td><b>".get_string("questiontype", "lesson").":</b> \n";
choose_from_menu($LESSON_QUESTION_TYPE, "qtype", LESSON_MULTICHOICE, "");
helpbutton("questiontype", get_string("questiontype", "lesson"), "lesson");
echo "<br /><b>".get_string("questionoption", "lesson").":</b>\n";
echo " <input type=\"checkbox\" name=\"qoption\" value=\"1\"/>";
helpbutton("questionoption", get_string("questionoption", "lesson"), "lesson");
echo "</td></tr>\n";
for ($i = 0; $i < $lesson->maxanswers; $i++) {
$iplus1 = $i + 1;
echo "<tr><td><b>".get_string("answer", "lesson")." $iplus1:</b><br />\n";
print_textarea(false, 6, 70, 630, 300, "answer[$i]");
echo "</td></tr>\n";
echo "<tr><td><b>".get_string("response", "lesson")." $iplus1:</b><br />\n";
print_textarea(false, 6, 70, 630, 300, "response[$i]");
echo "</td></tr>\n";
echo "<tr><td><B>".get_string("jump", "lesson")." $iplus1:</b> \n";
if ($i) {
// answers 2, 3, 4... jumpto this page
lesson_choose_from_menu($jump, "jumpto[$i]", 0, "");
} else {
// answer 1 jumpto next page
lesson_choose_from_menu($jump, "jumpto[$i]", LESSON_NEXTPAGE, "");
}
helpbutton("jumpto", get_string("jump", "lesson"), "lesson");
echo "</td></tr>\n";
}
// close table and form
?>
</table><br />
<input type="submit" value="<?php print_string("addaquestionpage", "lesson") ?>">
<input type="submit" name="cancel" value="<?php print_string("cancel") ?>">
</center>
</form>
<?PHP
}
/******************* confirm delete ************************************/
elseif ($action == 'confirmdelete' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
if (empty($_GET['pageid'])) {
error("Confirm delete: pageid missing");
}
$pageid = $_GET['pageid'];
if (!$thispage = get_record("lesson_pages", "id", $pageid)) {
error("Confirm delete: the page record not found");
}
print_heading(get_string("deletingpage", "lesson", $thispage->title));
// print the jumps to this page
if ($answers = get_records_select("lesson_answers", "lessonid = $lesson->id AND jumpto = $pageid + 1")) {
print_heading(get_string("thefollowingpagesjumptothispage", "lesson"));
echo "<p align=\"center\">\n";
foreach ($answers as $answer) {
if (!$title = get_field("lesson_pages", "title", "id", $answer->pageid)) {
error("Confirm delete: page title not found");
}
echo $title."<br />\n";
}
}
notice_yesno(get_string("confirmdeletionofthispage","lesson"),
"lesson.php?action=delete&id=$cm->id&pageid=$pageid",
"view.php?id=$cm->id");
}
/****************** continue ************************************/
elseif ($action == 'continue' ) {
// record answer (if necessary) and show response (if none say if answer is correct or not)
if (empty($_POST['pageid'])) {
error("Continue: pageid missing");
}
$pageid = $_POST['pageid'];
if (!$page = get_record("lesson_pages", "id", $pageid)) {
error("Continue: Page record not found");
}
// set up some defaults
$answerid = 0;
$noanswer = false;
$correctanswer = false;
$newpageid = 0; // stay on the page
switch ($page->qtype) {
case LESSON_SHORTANSWER :
if (!$useranswer = $_POST['answer']) {
$noanswer = true;
break;
}
if (!$answers = get_records("lesson_answers", "pageid", $pageid, "id")) {
error("Continue: No answers found");
}
foreach ($answers as $answer) {
// massage the wild cards (if present)
if (strpos(' '.$answer->answer, '*')) {
$answer->answer = str_replace('\*','@@@@@@', $answer->answer);
$answer->answer = str_replace('*','.*', $answer->answer);
$answer->answer = str_replace('@@@@@@', '\*', $answer->answer);
$answer->answer = str_replace('+', '\+', $answer->answer);
}
if (lesson_iscorrect($pageid, $answer->jumpto)) {
if ($page->qoption) {
// case sensitive
if (ereg('^'.$answer->answer.'$', $useranswer)) {
$correctanswer = true;
$newpageid = $answer->jumpto;
if (trim(strip_tags($answer->response))) {
$response = $answer->response;
}
}
} else {
// case insensitive
if (eregi('^'.$answer->answer.'$', $useranswer)) {
$correctanswer = true;
$newpageid = $answer->jumpto;
if (trim(strip_tags($answer->response))) {
$response = $answer->response;
}
}
}
} else {
// see if user typed in any of the wrong answers
// don't worry about case
if (eregi('^'.$answer->answer.'$', $useranswer)) {
$newpageid = $answer->jumpto;
if (trim(strip_tags($answer->response))) {
$response = $answer->response;
}
}
}
}
if (!isset($response)) {
if ($correctanswer) {
$response = get_string("thatsthecorrectanswer", "lesson");
} else {
$response = get_string("thatsthewronganswer", "lesson");
}
}
break;
case LESSON_TRUEFALSE :
if (empty($_POST['answerid'])) {
$noanswer = true;
break;
}
$answerid = $_POST['answerid'];
if (!$answer = get_record("lesson_answers", "id", $answerid)) {
error("Continue: answer record not found");
}
if (lesson_iscorrect($pageid, $answer->jumpto)) {
$correctanswer = true;
}
$newpageid = $answer->jumpto;
if (!$response = trim($answer->response)) {
if ($correctanswer) {
$response = get_string("thatsthecorrectanswer", "lesson");
} else {
$response = get_string("thatsthewronganswer", "lesson");
}
}
break;
case LESSON_MULTICHOICE :
if ($page->qoption) {
// MULTIANSWER allowed, user's answer is an array
if (isset($_POST['answer'])) {
$useranswers = $_POST['answer'];
} else {
$noanswer = true;
break;
}
// get the answers in a set order, the id order
if (!$answers = get_records("lesson_answers", "pageid", $pageid, "id")) {
error("Continue: No answers found");
}
$ncorrect = 0;
$nhits = 0;
$correctresponse = '';
$wrongresponse = '';
foreach ($answers as $answer) {
if (lesson_iscorrect($pageid, $answer->jumpto)) {
$ncorrect++;
foreach ($useranswers as $key => $answerid) {
if ($answerid == $answer->id) {
$nhits++;
}
}
// save the first jumpto page id, may be needed!...
if (!isset($correctpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$correctpageid = $answer->jumpto;
}
// ...also save any response from the correct answers...
if (trim(strip_tags($answer->response))) {
$correctresponse = $answer->response;
}
} else {
// save the first jumpto page id, may be needed!...
if (!isset($wrongpageid)) {
// leave in its "raw" state - will converted into a proper page id later
$wrongpageid = $answer->jumpto;
}
// ...and from the incorrect ones, don't know which to use at this stage
if (trim(strip_tags($answer->response))) {
$wrongresponse = $answer->response;
}
}
}
if ((count($useranswers) == $ncorrect) and ($nhits == $ncorrect)) {
$correctanswer = true;
if (!$response = $correctresponse) {
$response = get_string("thatsthecorrectanswer", "lesson");
}
$newpageid = $correctpageid;
} else {
if (!$response = $wrongresponse) {
$response = get_string("thatsthewronganswer", "lesson");
}
$newpageid = $wrongpageid;
}
} else {
// only one answer allowed
if (empty($_POST['answerid'])) {
$noanswer = true;
break;
}
$answerid = $_POST['answerid'];
if (!$answer = get_record("lesson_answers", "id", $answerid)) {
error("Continue: answer record not found");
}
if (lesson_iscorrect($pageid, $answer->jumpto)) {
$correctanswer = true;
}
$newpageid = $answer->jumpto;
if (!$response = trim($answer->response)) {
if ($correctanswer) {
$response = get_string("thatsthecorrectanswer", "lesson");
} else {
$response = get_string("thatsthewronganswer", "lesson");
}
}
}
break;
case LESSON_MATCHING :
if (isset($_POST['response'])) {
$response = $_POST['response'];
} else {
$noanswer = true;
break;
}
if (!$answers = get_records("lesson_answers", "pageid", $pageid, "id")) {
error("Continue: No answers found");
}
$ncorrect = 0;
$i = 0;
foreach ($answers as $answer) {
if ($answer->response == $response[$answer->id]) {
$ncorrect++;
}
if ($i == 0) {
$correctpageid = $answer->jumpto;
}
if ($i == 1) {
$wrongpageid = $answer->jumpto;
}
$i++;
}
if ($ncorrect == count($answers)) {
$response = get_string("thatsthecorrectanswer", "lesson");
$newpageid = $correctpageid;
$correctanswer = true;
} else {
$response = get_string("numberofcorrectmatches", "lesson", $ncorrect);
$newpageid = $wrongpageid;
}
break;
case LESSON_NUMERICAL :
// set defaults
$response = '';
$newpageid = 0;
if (!$useranswer = (float) $_POST['answer']) {
$noanswer = true;
break;
}
if (!$answers = get_records("lesson_answers", "pageid", $pageid, "id")) {
error("Continue: No answers found");
}
foreach ($answers as $answer) {
if (strpos($answer->answer, ':')) {
// there's a pairs of values
list($min, $max) = explode(':', $answer->answer);
$minimum = (float) $min;
$maximum = (float) $max;
} else {
// there's only one value
$minimum = (float) $answer->answer;
$maximum = $minimum;
}
if (($useranswer >= $minimum) and ($useranswer <= $maximum)) {
$newpageid = $answer->jumpto;
$response = trim($answer->response);
if (lesson_iscorrect($pageid, $newpageid)) {
$correctanswer = true;
}
break;
}
}
if ($correctanswer) {
if (!$response) {
$response = get_string("thatsthecorrectanswer", "lesson");
}
} else {
if (!$response) {
$response = get_string("thatsthewronganswer", "lesson");
}
}
break;
case LESSON_BRANCHTABLE:
$noanswer = false;
$newpageid = $_POST['jumpto'];
// convert jumpto page into a proper page id
if ($newpageid == 0) {
$newpageid = $pageid;
} elseif ($newpageid == LESSON_NEXTPAGE) {
if (!$newpageid = $page->nextpageid) {
// no nextpage go to end of lesson
$newpageid = LESSON_EOL;
}
}
// no need to record anything in lesson_attempts
redirect("view.php?id=$cm->id&action=navigation&pageid=$newpageid");
print_footer($course);
exit();
break;
}
if ($noanswer) {
$newpageid = $pageid; // display same page again
print_simple_box(get_string("noanswer", "lesson"), "center");
} else {
$nretakes = count_records("lesson_grades", "lessonid", $lesson->id, "userid", $USER->id);
if (isstudent($course->id)) {
// record student's attempt
$attempt->lessonid = $lesson->id;
$attempt->pageid = $pageid;
$attempt->userid = $USER->id;
$attempt->answerid = $answerid;
$attempt->retry = $nretakes;
$attempt->correct = $correctanswer;
$attempt->timeseen = time();
if (!$newattemptid = insert_record("lesson_attempts", $attempt)) {
error("Continue: attempt not inserted");
}
if (!$correctanswer and ($newpageid == 0)) {
// wrong answer and student is stuck on this page - check how many attempts
// the student has had at this page/question
$nattempts = count_records("lesson_attempts", "pageid", $pageid, "userid", $USER->id,
"retry", $nretakes);
if ($nattempts >= $lesson->maxattempts) {
if ($lesson->maxattempts > 1) { // don't bother with message if only one attempt
echo "<p align=\"center\">(".get_string("maximumnumberofattempts", "lesson").
" ".get_string("reached", "lesson")." - ".
get_string("movingtonextpage", "lesson").")</p>\n";
}
$newpageid = LESSON_NEXTPAGE;
}
}
}
// convert jumpto page into a proper page id
if ($newpageid == 0) {
$newpageid = $pageid;
} elseif ($newpageid == LESSON_NEXTPAGE) {
if ($lesson->nextpagedefault) {
// in Flash Card mode...
// ... first get the page ids (lessonid the 5th param is needed to make get_records play)
$allpages = get_records("lesson_pages", "lessonid", $lesson->id, "id", "id,lessonid");
shuffle ($allpages);
$found = false;
if ($lesson->nextpagedefault == LESSON_UNSEENPAGE) {
foreach ($allpages as $thispage) {
if (!count_records("lesson_attempts", "pageid", $thispage->id, "userid",
$USER->id, "retry", $nretakes)) {
$found = true;
break;
}
}
} elseif ($lesson->nextpagedefault == LESSON_UNANSWEREDPAGE) {
foreach ($allpages as $thispage) {
if (!count_records_select("lesson_attempts", "pageid = $thispage->id AND
userid = $USER->id AND correct = 1 AND retry = $nretakes")) {
$found = true;
break;
}
}
}
if ($found) {
$newpageid = $thispage->id;
if ($lesson->maxpages) {
// check number of pages viewed (in the lesson)
if (count_records("lesson_attempts", "lessonid", $lesson->id, "userid", $USER->id,
"retry", $nretakes) >= $lesson->maxpages) {
$newpageid = LESSON_EOL;
}
}
} else {
$newpageid = LESSON_EOL;
}
} elseif (!$newpageid = $page->nextpageid) {
// no nextpage go to end of lesson
$newpageid = LESSON_EOL;
}
}
// display response (if there is one - there should be!)
if ($response) {
$title = get_field("lesson_pages", "title", "id", $pageid);
print_heading($title);
echo "<table width=\"80%\" border=\"0\" align=\"center\"><tr><td>\n";
print_simple_box(format_text($response), 'center');
echo "</td></tr></table>\n";
}
}
echo "<form name=\"pageform\" method =\"post\" action=\"view.php\">\n";
echo "<input type=\"hidden\" name=\"id\" value=\"$cm->id\">\n";
echo "<input type=\"hidden\" name=\"action\" value=\"navigation\">\n";
echo "<input type=\"hidden\" name=\"pageid\" value=\"$newpageid\">\n";
echo "<p align=\"center\"><input type=\"submit\" name=\"continue\" value=\"".
get_string("continue", "lesson")."\"></p>\n";
echo "</form>\n";
}
/******************* delete ************************************/
elseif ($action == 'delete' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
if (empty($_GET['pageid'])) {
error("Delete: pageid missing");
}
$pageid = $_GET['pageid'];
if (!$thispage = get_record("lesson_pages", "id", $pageid)) {
error("Delete: page record not found");
}
print_string("deleting", "lesson");
// first delete all the associated records...
delete_records("lesson_attempts", "pageid", $pageid);
// ...now delete the answers...
delete_records("lesson_answers", "pageid", $pageid);
// ..and the page itself
delete_records("lesson_pages", "id", $pageid);
// repair the hole in the linkage
if (!$thispage->prevpageid) {
// this is the first page...
if (!$page = get_record("lesson_pages", "id", $thispage->nextpageid)) {
error("Delete: next page not found");
}
if (!set_field("lesson_pages", "prevpageid", 0, "id", $page->id)) {
error("Delete: unable to set prevpage link");
}
} elseif (!$thispage->nextpageid) {
// this is the last page...
if (!$page = get_record("lesson_pages", "id", $thispage->prevpageid)) {
error("Delete: prev page not found");
}
if (!set_field("lesson_pages", "nextpageid", 0, "id", $page->id)) {
error("Delete: unable to set nextpage link");
}
} else {
// page is in the middle...
if (!$prevpage = get_record("lesson_pages", "id", $thispage->prevpageid)) {
error("Delete: prev page not found");
}
if (!$nextpage = get_record("lesson_pages", "id", $thispage->nextpageid)) {
error("Delete: next page not found");
}
if (!set_field("lesson_pages", "nextpageid", $nextpage->id, "id", $prevpage->id)) {
error("Delete: unable to set next link");
}
if (!set_field("lesson_pages", "prevpageid", $prevpage->id, "id", $nextpage->id)) {
error("Delete: unable to set prev link");
}
}
redirect("view.php?id=$cm->id", get_string("ok"));
}
/************** edit page ************************************/
elseif ($action == 'editpage' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
// get the page
if (!$page = get_record("lesson_pages", "id", $_GET['pageid'])) {
error("Edit page: page record not found");
}
// set of jump array
$jump[0] = get_string("thispage", "lesson");
$jump[LESSON_NEXTPAGE] = get_string("nextpage", "lesson");
$jump[LESSON_EOL] = get_string("endoflesson", "lesson");
if (!$apageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
error("Edit page: first page not found");
}
while (true) {
if ($apageid) {
if (!$apage = get_record("lesson_pages", "id", $apageid)) {
error("Edit page: apage record not found");
}
if ($apage->qtype != LESSON_ENDOFBRANCH) {
// don't include EOB's in the list...
if (trim($page->title)) { // ...nor nuffin pages
$jump[$apageid] = $apage->title;
}
}
$apageid = $apage->nextpageid;
} else {
// last page reached
break;
}
}
// give teacher a proforma
?>
<form name="editpage" method="post" action="lesson.php">
<input type="hidden" name="id" value="<?PHP echo $cm->id ?>">
<input type="hidden" name="action" value="updatepage">
<input type="hidden" name="pageid" value="<?PHP echo $_GET['pageid'] ?>">
<input type="hidden" name="redisplay" value="0">
<center><table cellpadding=5 border=1>
<tr><td align="center">
<tr valign="top">
<td><b><?php print_string("pagetitle", "lesson"); ?>:</b><br />
<input type="text" name="title" size="80" maxsize="255" value="<?PHP echo $page->title ?>"></td>
</tr>
<?PHP
echo "<tr><td><b>";
echo get_string("pagecontents", "lesson").":</b><br />\n";
print_textarea($usehtmleditor, 25, 70, 630, 400, "contents", $page->contents);
use_html_editor("contents"); // always the editor
echo "</td></tr>\n";
$n = 0;
switch ($page->qtype) {
case LESSON_SHORTANSWER :
echo "<tr><td><b>".get_string("questiontype", "lesson").":</b> \n";
choose_from_menu($LESSON_QUESTION_TYPE, "qtype", $page->qtype, "");
echo "&nbsp;&nbsp;";
echo " <b>".get_string("casesensitive", "lesson").":</b> \n";
if ($page->qoption) {
echo "<input type=\"checkbox\" name=\"qoption\" value=\"1\" checked=\"checked\"/>";
} else {
echo "<input type=\"checkbox\" name=\"qoption\" value=\"1\"/>";
}
helpbutton("questiontypes", get_string("questiontype", "lesson"), "lesson");
break;
case LESSON_MULTICHOICE :
echo "<tr><td><b>".get_string("questiontype", "lesson").":</b> \n";
choose_from_menu($LESSON_QUESTION_TYPE, "qtype", $page->qtype, "");
echo "&nbsp;&nbsp;";
echo " <b>".get_string("multianswer", "lesson").":</b> \n";
if ($page->qoption) {
echo "<input type=\"checkbox\" name=\"qoption\" value=\"1\" checked=\"checked\"/>";
} else {
echo "<input type=\"checkbox\" name=\"qoption\" value=\"1\"/>";
}
helpbutton("questiontypes", get_string("questiontype", "lesson"), "lesson");
break;
case LESSON_TRUEFALSE :
case LESSON_MATCHING :
case LESSON_NUMERICAL :
echo "<tr><td><b>".get_string("questiontype", "lesson").":</b> \n";
choose_from_menu($LESSON_QUESTION_TYPE, "qtype", $page->qtype, "");
helpbutton("questiontypes", get_string("questiontype", "lesson"), "lesson");
break;
case LESSON_BRANCHTABLE :
echo "<input type=\"hidden\" name=\"qtype\" value=\"$page->qtype\">\n";
echo "<tr><td><b>".get_string("branchtable", "lesson")."</b> \n";
break;
case LESSON_ENDOFBRANCH :
echo "<input type=\"hidden\" name=\"qtype\" value=\"$page->qtype\">\n";
echo "<tr><td><b>".get_string("endofbranch", "lesson")."</b> \n";
break;
}
echo "</td></tr>\n";
// get the answers in a set order, the id order
if ($answers = get_records("lesson_answers", "pageid", $page->id, "id")) {
foreach ($answers as $answer) {
$flags = intval($answer->flags); // force into an integer
$nplus1 = $n + 1;
echo "<input type=\"hidden\" name=\"answerid[$n]\" value=\"$answer->id\">\n";
switch ($page->qtype) {
case LESSON_MULTICHOICE:
case LESSON_TRUEFALSE:
case LESSON_SHORTANSWER:
case LESSON_NUMERICAL:
case LESSON_MATCHING:
echo "<tr><td><b>".get_string("answer", "lesson")." $nplus1:</b>\n";
if ($flags & LESSON_ANSWER_EDITOR) {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$n]\" value=\"1\"
checked=\"checked\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea($usehtmleditor, 20, 70, 630, 300, "answer[$n]", $answer->answer);
use_html_editor("answer[$n]"); // switch on the editor
} else {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$n]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 6, 70, 630, 300, "answer[$n]", $answer->answer);
}
echo "</td></tr>\n";
echo "<tr><td><b>".get_string("response", "lesson")." $nplus1:</b>\n";
if ($flags & LESSON_RESPONSE_EDITOR) {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"responseeditor[$n]\" value=\"1\"
checked=\"checked\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea($usehtmleditor, 20, 70, 630, 300, "response[$n]", $answer->response);
use_html_editor("response[$n]"); // switch on the editor
} else {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"responseeditor[$n]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 6, 70, 630, 300, "response[$n]", $answer->response);
}
echo "</td></tr>\n";
break;
case LESSON_BRANCHTABLE:
echo "<tr><td><b>".get_string("description", "lesson")." $nplus1:</b>\n";
if ($flags & LESSON_ANSWER_EDITOR) {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$n]\" value=\"1\"
checked=\"checked\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea($usehtmleditor, 20, 70, 630, 300, "answer[$n]", $answer->answer);
} else {
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$n]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 10, 70, 630, 300, "answer[$n]", $answer->answer);
}
echo "</td></tr>\n";
break;
}
echo "<tr><td><b>".get_string("jump", "lesson")." $nplus1:</b> \n";
lesson_choose_from_menu($jump, "jumpto[$n]", $answer->jumpto, "");
helpbutton("jumpto", get_string("jump", "lesson"), "lesson");
echo "</td></tr>\n";
$n++;
}
}
if ($page->qtype != LESSON_ENDOFBRANCH) {
for ($i = $n; $i < $lesson->maxanswers; $i++) {
$iplus1 = $i + 1;
echo "<input type=\"hidden\" name=\"answerid[$i]\" value=\"0\">\n";
switch ($page->qtype) {
case LESSON_MULTICHOICE:
case LESSON_TRUEFALSE:
case LESSON_SHORTANSWER:
case LESSON_NUMERICAL:
case LESSON_MATCHING:
echo "<tr><td><b>".get_string("answer", "lesson")." $iplus1:</b>\n";
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$i]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 10, 70, 630, 300, "answer[$i]");
echo "</td></tr>\n";
echo "<tr><td><b>".get_string("response", "lesson")." $iplus1:</b>\n";
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"responseeditor[$i]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 10, 70, 630, 300, "response[$i]");
echo "</td></tr>\n";
break;
case LESSON_BRANCHTABLE:
echo "<tr><td><b>".get_string("description", "lesson")." $iplus1:</b>\n";
echo " [".get_string("useeditor", "lesson").": ".
"<input type=\"checkbox\" name=\"answereditor[$i]\" value=\"1\">";
helpbutton("useeditor", get_string("useeditor", "lesson"), "lesson");
echo "]<br />\n";
print_textarea(false, 10, 70, 630, 300, "answer[$i]");
echo "</td></tr>\n";
break;
}
echo "<tr><td><B>".get_string("jump", "lesson")." $iplus1:</b> \n";
lesson_choose_from_menu($jump, "jumpto[$i]", 0, "");
helpbutton("jumpto", get_string("jump", "lesson"), "lesson");
echo "</td></tr>\n";
}
}
// close table and form
?>
</table><br />
<input type="button" value="<?php print_string("redisplaypage", "lesson") ?>"
onclick="document.editpage.redisplay.value=1;document.editpage.submit();">
<input type="submit" value="<?php print_string("savepage", "lesson") ?>">
<input type="submit" name="cancel" value="<?php print_string("cancel") ?>">
</center>
</form>
<?PHP
}
/****************** insert page ************************************/
elseif ($action == 'insertpage' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
$timenow = time();
$form = data_submitted();
if ($form->pageid) {
// the new page is not the first page
if (!$page = get_record("lesson_pages", "id", $form->pageid)) {
error("Insert page: page record not found");
}
$newpage->lessonid = $lesson->id;
$newpage->prevpageid = $form->pageid;
$newpage->nextpageid = $page->nextpageid;
$newpage->timecreated = $timenow;
$newpage->qtype = $form->qtype;
if (isset($form->qoption)) {
$newpage->qoption = $form->qoption;
} else {
$newpage->qoption = 0;
}
$newpage->title = $form->title;
$newpage->contents = trim($form->contents);
$newpageid = insert_record("lesson_pages", $newpage);
if (!$newpageid) {
error("Insert page: new page not inserted");
}
// update the linked list
if (!set_field("lesson_pages", "nextpageid", $newpageid, "id", $form->pageid)) {
error("Insert page: unable to update next link");
}
if ($page->nextpageid) {
// new page is not the last page
if (!set_field("lesson_pages", "prevpageid", $newpageid, "id", $page->nextpageid)) {
error("Insert page: unable to update previous link");
}
}
} else {
// new page is the first page
// get the existing (first) page (if any)
if (!$page = get_record_select("lesson_pages", "lessonid = $lesson->id AND prevpageid = 0")) {
// there are no existing pages
$newpage->lessonid = $lesson->id;
$newpage->prevpageid = 0; // this is a first page
$newpage->nextpageid = 0; // this is the only page
$newpage->timecreated = $timenow;
$newpage->qtype = $form->qtype;
if (isset($form->qoption)) {
$newpage->qoption = $form->qoption;
} else {
$newpage->qoption = 0;
}
$newpage->title = $form->title;
$newpage->contents = trim($form->contents);
$newpageid = insert_record("lesson_pages", $newpage);
if (!$newpageid) {
error("Insert page: new first page not inserted");
}
} else {
// there are existing pages put this at the start
$newpage->lessonid = $lesson->id;
$newpage->prevpageid = 0; // this is a first page
$newpage->nextpageid = $page->id;
$newpage->timecreated = $timenow;
$newpage->qtype = $form->qtype;
if (isset($form->qoption)) {
$newpage->qoption = $form->qoption;
} else {
$newpage->qoption = 0;
}
$newpage->title = $form->title;
$newpage->contents = trim($form->contents);
$newpageid = insert_record("lesson_pages", $newpage);
if (!$newpageid) {
error("Insert page: first page not inserted");
}
// update the linked list
if (!set_field("lesson_pages", "prevpageid", $newpageid, "id", $page->id)) {
error("Insert page: unable to update link");
}
}
}
// now add the answers
for ($i = 0; $i < $lesson->maxanswers; $i++) {
if (trim(strip_tags($form->answer[$i]))) { // strip_tags because the HTML editor adds <p><br />...
$newanswer->lessonid = $lesson->id;
$newanswer->pageid = $newpageid;
$newanswer->timecreated = $timenow;
$newanswer->answer = trim($form->answer[$i]);
if (isset($form->response[$i])) {
$newanswer->response = trim($form->response[$i]);
}
if (isset($form->jumpto[$i])) {
$newanswer->jumpto = $form->jumpto[$i];
}
$newanswerid = insert_record("lesson_answers", $newanswer);
if (!$newanswerid) {
error("Insert Page: answer record $i not inserted");
}
} else {
break;
}
}
redirect("view.php?id=$cm->id", get_string("ok"));
}
/****************** move ************************************/
elseif ($action == 'move') {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
$pageid = $_GET['pageid'];
$title = get_field("lesson_pages", "title", "id", $pageid);
print_heading(get_string("moving", "lesson", $title));
if (!$page = get_record_select("lesson_pages", "lessonid = $lesson->id AND prevpageid = 0")) {
error("Move: first page not found");
}
echo "<center><table cellpadding=\"5\" border=\"1\">\n";
echo "<tr><td><a href=\"lesson.php?id=$cm->id&action=moveit&pageid=$pageid&after=0\"><small>".
get_string("movepagehere", "lesson")."</small></a></td></tr>\n";
while (true) {
if ($page->id != $pageid) {
if (!$title = trim($page->title)) {
$title = "<< ".get_string("notitle", "lesson")." >>";
}
echo "<tr><td bgcolor=\"$THEME->cellheading2\"><b>$title</b></td></tr>\n";
echo "<tr><td><a href=\"lesson.php?id=$cm->id&action=moveit&pageid=$pageid&after={$page->id}\"><small>".
get_string("movepagehere", "lesson")."</small></a></td></tr>\n";
}
if ($page->nextpageid) {
if (!$page = get_record("lesson_pages", "id", $page->nextpageid)) {
error("Teacher view: Next page not found!");
}
} else {
// last page reached
break;
}
}
echo "</table>\n";
}
/****************** moveit ************************************/
elseif ($action == 'moveit') {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
$pageid = $_GET['pageid']; // page to move
if (!$page = get_record("lesson_pages", "id", $pageid)) {
error("Moveit: page not found");
}
$after = $_GET['after']; // target page
print_heading(get_string("moving", "lesson", $page->title));
// first step. determine the new first page
// (this is done first as the current first page will be lost in the next step)
if (!$after) {
// the moved page is the new first page
$newfirstpageid = $pageid;
// reset $after so that is points to the last page
// (when the pages are in a ring this will in effect be the first page)
if ($page->nextpageid) {
if (!$after = get_field("lesson_pages", "id", "lessonid", $lesson->id, "nextpageid", 0)) {
error("Moveit: last page id not found");
}
} else {
// the page being moved is the last page, so the new last page will be
$after = $page->prevpageid;
}
} elseif (!$page->prevpageid) {
// the page to be moved was the first page, so the following page must be the new first page
$newfirstpageid = $page->nextpageid;
} else {
// the current first page remains the first page
if (!$newfirstpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
error("Moveit: current first page id not found");
}
}
// the rest is all unconditional...
// second step. join pages into a ring
if (!$firstpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
error("Moveit: firstpageid not found");
}
if (!$lastpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "nextpageid", 0)) {
error("Moveit: lastpage not found");
}
if (!set_field("lesson_pages", "prevpageid", $lastpageid, "id", $firstpageid)) {
error("Moveit: unable to update link");
}
if (!set_field("lesson_pages", "nextpageid", $firstpageid, "id", $lastpageid)) {
error("Moveit: unable to update link");
}
// third step. remove the page to be moved
if (!$prevpageid = get_field("lesson_pages", "prevpageid", "id", $pageid)) {
error("Moveit: prevpageid not found");
}
if (!$nextpageid = get_field("lesson_pages", "nextpageid", "id", $pageid)) {
error("Moveit: nextpageid not found");
}
if (!set_field("lesson_pages", "nextpageid", $nextpageid, "id", $prevpageid)) {
error("Moveit: unable to update link");
}
if (!set_field("lesson_pages", "prevpageid", $prevpageid, "id", $nextpageid)) {
error("Moveit: unable to update link");
}
// fourth step. insert page to be moved in new place...
if (!$nextpageid = get_field("lesson_pages", "nextpageid", "id", $after)) {
error("Movit: nextpageid not found");
}
if (!set_field("lesson_pages", "nextpageid", $pageid, "id", $after)) {
error("Moveit: unable to update link");
}
if (!set_field("lesson_pages", "prevpageid", $pageid, "id", $nextpageid)) {
error("Moveit: unable to update link");
}
// ...and set the links in the moved page
if (!set_field("lesson_pages", "prevpageid", $after, "id", $pageid)) {
error("Moveit: unable to update link");
}
if (!set_field("lesson_pages", "nextpageid", $nextpageid, "id", $pageid)) {
error("Moveit: unable to update link");
}
// fifth step. break the ring
if (!$newlastpageid = get_field("lesson_pages", "prevpageid", "id", $newfirstpageid)) {
error("Moveit: newlastpageid not found");
}
if (!set_field("lesson_pages", "prevpageid", 0, "id", $newfirstpageid)) {
error("Moveit: unable to update link");
}
if (!set_field("lesson_pages", "nextpageid", 0, "id", $newlastpageid)) {
error("Moveit: unable to update link");
}
redirect("view.php?id=$cm->id", get_string("ok"));
}
/****************** update page ************************************/
elseif ($action == 'updatepage' ) {
if (!isteacher($course->id)) {
error("Only teachers can look at this page");
}
$timenow = time();
$form = data_submitted();
$page->id = $form->pageid;
$page->timemodified = $timenow;
$page->qtype = $form->qtype;
if (isset($form->qoption)) {
$page->qoption = $form->qoption;
} else {
$page->qoption = 0;
}
$page->title = $form->title;
$page->contents = trim($form->contents);
if (!update_record("lesson_pages", $page)) {
error("Update page: page not updated");
}
if ($page->qtype == LESSON_ENDOFBRANCH) {
// there's just a single answer with a jump
$oldanswer->id = $form->answerid[0];
$oldanswer->timemodified = $timenow;
$oldanswer->jumpto = $form->jumpto[0];
if (!update_record("lesson_answers", $oldanswer)) {
error("Update page: EOB not updated");
}
} else {
// it's an "ordinary" page
for ($i = 0; $i < $lesson->maxanswers; $i++) {
// strip tags because the editor gives <p><br />...
// also save any answers where the editor is (going to be) used
if (!isset($form->answereditor[$i])) { // clean up check box
$form->answereditor[$i] = 0;
}
if (!isset($form->responseeditor[$i])) { // clean up check box
$form->responseeditor[$i] = 0;
}
if (trim(strip_tags($form->answer[$i])) or $form->answereditor[$i] or $form->responseeditor[$i]) {
if ($form->answerid[$i]) {
unset($oldanswer);
$oldanswer->id = $form->answerid[$i];
$oldanswer->flags = $form->answereditor[$i] * LESSON_ANSWER_EDITOR +
$form->responseeditor[$i] * LESSON_RESPONSE_EDITOR;
$oldanswer->timemodified = $timenow;
$oldanswer->answer = trim($form->answer[$i]);
if (isset($form->response[$i])) {
$oldanswer->response = trim($form->response[$i]);
}
$oldanswer->jumpto = $form->jumpto[$i];
if (!update_record("lesson_answers", $oldanswer)) {
error("Update page: answer $i not updated");
}
} else {
// it's a new answer
unset($newanswer); // need to clear id if more than one new answer is ben added
$newanswer->lessonid = $lesson->id;
$newanswer->pageid = $page->id;
$newanswer->flags = $form->answereditor[$i] * LESSON_ANSWER_EDITOR +
$form->responseeditor[$i] * LESSON_RESPONSE_EDITOR;
$newanswer->timecreated = $timenow;
$newanswer->answer = trim($form->answer[$i]);
if (isset($form->response[$i])) {
$newanswer->response = trim($form->response[$i]);
}
$newanswer->jumpto = $form->jumpto[$i];
$newanswerid = insert_record("lesson_answers", $newanswer);
if (!$newanswerid) {
error("Update page: answer record not inserted");
}
}
} else {
if ($form->answerid[$i]) {
// need to delete blanked out answer
if (!delete_records("lesson_answers", "id", $form->answerid[$i])) {
error("Update page: unable to delete answer record");
}
}
}
}
}
if ($form->redisplay) {
redirect("lesson.php?id=$cm->id&action=editpage&pageid=$page->id");
} else {
redirect("view.php?id=$cm->id", get_string("ok"));
}
}
/*************** no man's land **************************************/
else {
error("Fatal Error: Unknown Action: ".$action."\n");
}
print_footer($course);
?>
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