Actualización

main/lp/aicc_api.php

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+<?php
+
+/* For licensing terms, see /license.txt */
+
+use ChamiloSession as Session;
+
+/**
+ * API event handler functions for AICC / CMIv4 in API communication mode.
+ *
+ * @author   Denes Nagy <darkden@freemail.hu>
+ * @author   Yannick Warnier <ywarnier@beeznest.org>
+ *
+ * @version  v 1.0
+ *
+ * @package  chamilo.learnpath
+ *
+ * @license    GNU/GPL
+ */
+
+/**
+ * This script is divided into three sections.
+ * The first section (below) is the initialisation part.
+ * The second section is the AICC object part
+ * The third section defines the event handlers for Chamilo's internal messaging
+ * and frames refresh.
+ *
+ * This script implements the API messaging for AICC. The HACP messaging is
+ * made by another set of scripts.
+ */
+
+// Flag to allow for anonymous user - needs to be set before global.inc.php.
+$use_anonymous = true;
+
+// Load common libraries using a compatibility script to bridge between 1.6 and 1.8.
+require_once __DIR__.'/../inc/global.inc.php';
+
+// Is this needed? This is probabaly done in the header file.
+$file = Session::read('file');
+/** @var learnpath $oLP */
+$oLP = UnserializeApi::unserialize('lp', Session::read('lpobject'));
+$oItem = $oLP->items[$oLP->current];
+if (!is_object($oItem)) {
+    error_log('New LP - scorm_api - Could not load oItem item', 0);
+    exit;
+}
+$autocomplete_when_80pct = 0;
+
+/* JavaScript Functions */
+
+?>var scorm_logs=<?php echo empty($oLP->scorm_debug) ? '0' : '3'; ?>; //debug log level for SCORM. 0 = none, 1=light, 2=a lot, 3=all - displays logs in log frame
+var lms_logs=0; //debug log level for LMS actions. 0=none, 1=light, 2=a lot, 3=all
+//logit_lms('scormfunctions.php included',0);
+
+function APIobject() {
+  this.LMSInitialize=LMSInitialize;
+  this.LMSGetValue=LMSGetValue;
+  this.LMSSetValue=LMSSetValue;
+  this.LMSCommit=LMSCommit;
+  this.LMSFinish=LMSFinish;
+  this.LMSGetLastError=LMSGetLastError;
+  this.LMSGetErrorString=LMSGetErrorString;
+  this.LMSGetDiagnostic=LMSGetDiagnostic;
+}
+
+// It is not sure that the scos use the above declarations.
+
+API = new APIobject(); //for scorm 1.2
+
+var G_NoError = 0;
+var G_GeneralException = 101;
+var G_ServerBusy = 102;
+var G_InvalidArgumentError = 201;
+var G_ElementCannotHaveChildren = 202;
+var G_ElementIsNotAnArray = 203;
+var G_NotInitialized = 301;
+var G_NotImplementedError = 401;
+var G_InvalidSetValue = 402;
+var G_ElementIsReadOnly = 403;
+var G_ElementIsWriteOnly = 404;
+var G_IncorrectDataType = 405;
+
+var G_LastError = G_NoError ;
+
+var commit = false ;
+
+// Strictly SCORM variables.
+var score=<?php echo $oItem->get_score(); ?>;
+var max=<?php echo $oItem->get_max(); ?>;
+var min=<?php echo $oItem->get_min(); ?>;
+var lesson_status='<?php echo $oItem->get_status(); ?>';
+var session_time='<?php echo $oItem->get_scorm_time('js'); ?>';
+var suspend_data = '<?php echo $oItem->get_suspend_data(); ?>';
+var lesson_location = '<?php echo $oItem->get_lesson_location(); ?>';
+var total_time = '<?php echo $oItem->get_scorm_time('js'); ?>';
+
+// Chamilo internal variables.
+var saved_lesson_status = 'not attempted';
+var lms_lp_id = <?php echo $oLP->get_id(); ?>;
+var lms_item_id = <?php echo $oItem->get_id(); ?>;
+//var lms_new_item_id = 0; //temporary value (only there between a load_item() and a LMSInitialize())
+var lms_been_synchronized = 0;
+var lms_initialized = 0;
+var lms_total_lessons = <?php echo $oLP->get_total_items_count(); ?>;
+var lms_complete_lessons = <?php echo $oLP->get_complete_items_count(); ?>;
+var lms_progress_bar_mode = '<?php echo $oLP->progress_bar_mode; ?>';
+if(lms_progress_bar_mode == ''){lms_progress_bar_mode='%';}
+var lms_view_id = '<?php echo $oLP->get_view(null, $_user['user_id']); ?>';
+if(lms_view_id == ''){ lms_view_id = 1;}
+var lms_user_id = '<?php echo $_user['user_id']; ?>';
+var lms_next_item = '<?php echo $oLP->get_next_item_id(); ?>';
+var lms_previous_item = '<?php echo $oLP->get_previous_item_id(); ?>';
+var lms_lp_type = '<?php echo $oLP->get_type(); ?>';
+var lms_item_type = '<?php echo $oItem->get_type(); ?>';
+
+// Backup for old values.
+var old_score = 0;
+var old_max = 0;
+var old_min = 0;
+var old_lesson_status = '';
+var old_session_time = '';
+var old_suspend_data = '';
+var lms_old_item_id = 0;
+
+function LMSInitialize() {  //this is the initialize function of all APIobjects
+    logit_scorm('LMSInitialise()',0);
+    lms_initialized=1;
+    return('true');
+}
+function LMSGetValue(param) {
+    //logit_scorm("LMSGetValue('"+param+"')",1);
+    var result='';
+    if(param=='cmi.core._children' || param=='cmi.core_children'){
+        result='entry, exit, lesson_status, student_id, student_name, lesson_location, total_time, credit, lesson_mode, score, session_time';
+    }else if(param == 'cmi.core.entry'){
+        result='';
+    }else if(param == 'cmi.core.exit'){
+        result='';
+    }else if(param == 'cmi.core.lesson_status'){
+        if(lesson_status != '') {
+            result=lesson_status;
+        }
+        else{
+            result='not attempted';
+        }
+    }else if(param == 'cmi.core.student_id'){
+        result='<?php echo $_user['user_id']; ?>';
+    }else if(param == 'cmi.core.student_name'){
+    <?php
+    $who = addslashes(api_get_person_name($_user['firstName'], $_user['lastName']));
+    echo "result='$who';";
+    ?>
+    }else if(param == 'cmi.core.lesson_location'){
+        result=lesson_location;
+    }else if(param == 'cmi.core.total_time'){
+        result=total_time;
+    }else if(param == 'cmi.core.score._children'){
+        result='raw,min,max';
+    }else if(param == 'cmi.core.score.raw'){
+        result=score;
+    }else if(param == 'cmi.core.score.max'){
+        result=max;
+    }else if(param == 'cmi.core.score.min'){
+        result=min;
+    }else if(param == 'cmi.core.score'){
+        result=score;
+    }else if(param == 'cmi.core.credit'){
+        result='no-credit';
+    }else if(param == 'cmi.core.lesson_mode'){
+        result='normal';
+    }else if(param == 'cmi.suspend_data'){
+        result='<?php echo $oItem->get_suspend_data(); ?>';
+    }else if(param == 'cmi.launch_data'){
+        result='';
+    }else if(param == 'cmi.objectives._count'){
+        result='<?php echo $oItem->get_view_count(); ?>';
+    }
+    /*
+    // Switch not working??? WTF???
+    switch(param) {
+        case 'cmi.core._children':
+            result='entry, exit, lesson_status, student_id, student_name, lesson_location, total_time, credit, lesson_mode, score, session_time';
+            break;
+        case 'cmi.core_children':
+            result='entry, exit, lesson_status, student_id, student_name, lesson_location, total_time, credit, lesson_mode, score, session_time';
+            break;
+        case 'cmi.core.entry':
+            result='';
+            break;
+        case 'cmi.core.exit':
+            result='';
+            break;
+        case 'cmi.core.lesson_status':
+            if(lesson_status != '') {
+                result=lesson_status;
+            }
+            else{
+                result='not attempted';
+            }
+            break;
+        case 'cmi.core.student_id':
+            result='<?php echo $_user['user_id']; ?>';
+            break;
+        case 'cmi.core.student_name':
+          <?php
+            $who = addslashes(api_get_person_name($_user['firstName'], $_user['lastName']));
+            echo "result='$who';";
+          ?>	break;
+        case 'cmi.core.lesson_location':
+            result='';
+            break;
+        case 'cmi.core.total_time':
+            result=total_time;
+            break;
+        case 'cmi.core.score._children':
+            result='raw,min,max';
+            break;
+        case 'cmi.core.score.raw':
+            result=score;
+            break;
+        case 'cmi.core.score.max':
+            result=max;
+            break;
+        case 'cmi.core.score.min':
+            result=min;
+            break;
+        case 'cmi.core.score':
+            result=score;
+            break;
+        case 'cmi.core.credit':
+            result='no-credit';
+            break;
+        case 'cmi.core.lesson_mode':
+            result='normal';
+            break;
+        case 'cmi.suspend_data':
+            result='<?php echo $oItem->get_suspend_data(); ?>';
+            break;
+        case 'cmi.launch_data':
+            result='';
+            break;
+        case 'cmi.objectives._count':
+            result='<?php echo $oItem->get_view_count(); ?>';
+            break;
+        default:
+            result='';
+            break;
+    }
+    */
+    logit_scorm("LMSGetValue('"+param+"') returned '"+result+"'",1);
+    return result;
+}
+function LMSSetValue(param, val) {
+    logit_scorm("LMSSetValue('"+param+"','"+val+"')",0);
+    switch(param) {
+    case 'cmi.core.score.raw'		: score= val ;			break;
+    case 'cmi.core.score.max'		: max = val;			break;
+    case 'cmi.core.score.min'		: min = val;			break;
+    case 'cmi.core.lesson_location' : lesson_location = val;break;
+    case 'cmi.core.lesson_status'	:
+        saved_lesson_status = lesson_status;
+        lesson_status = val;
+        <?php if ($oLP->mode != 'fullscreen') {
+              ?>
+        //var update = update_toc(lesson_status,lms_item_id);
+        <?php
+          } ?>
+        break;
+    case 'cmi.completion_status'	: lesson_status = val;	break; //1.3
+    case 'cmi.core.session_time'	: session_time = val;	break;
+    case 'cmi.score.scaled'			: score = val ;			break; //1.3
+    case 'cmi.success_status'		: success_status = val; break; //1.3
+    case 'cmi.suspend_data'			: suspend_data = val;   break;
+    }
+    //var update = update_toc();
+    //var update_progress = update_progress_bar();
+    <?php
+    if ($oLP->force_commit == 1) {
+        echo "	var mycommit = LMSCommit('force');";
+    }
+    ?>
+    return(true);
+}
+function savedata(origin) { //origin can be 'commit', 'finish' or 'terminate'
+    <?php if ($autocomplete_when_80pct) {
+        ?>
+    if( ( lesson_status == 'incomplete') && (score >= (0.8*max) ) ){
+      lesson_status = 'completed';
+    }
+    <?php
+    }?>
+    param = 'id='+lms_item_id+'&origin='+origin+'&score='+score+'&max='+max+'&min='+min+'&lesson_status='+lesson_status+'&time='+session_time+'&suspend_data='+suspend_data;
+
+    url="http://<?php
+    $self = api_get_self();
+    $url = $_SERVER['HTTP_HOST'].$self;
+    $url = substr($url, 0, -14); // 14 is the length of this file's name (/scorm_api.php).
+    echo $url;
+    ?>/lp_controller.php?<?php echo api_get_cidreq(); ?>&action=save&lp_id=<?php echo $oLP->get_id(); ?>&" + param + "";
+    logit_lms('saving data (status='+lesson_status+')',1);
+    xajax_save_item(lms_lp_id, lms_user_id, lms_view_id, lms_item_id, score, max, min, lesson_status, session_time, suspend_data, lesson_location);
+    //xajax_update_pgs();
+    //xajax_update_toc();
+}
+
+function LMSCommit(val) {
+    logit_scorm('LMSCommit()',0);
+    commit = true ;
+    savedata('commit');
+    return('true');
+}
+function LMSFinish(val) {
+    if ( !commit ) {
+        logit_scorm('LMSFinish() (no LMSCommit())',1);
+    }
+    if ( commit ) {
+        logit_scorm('LMSFinish() called',1);
+        savedata('finish');
+    }
+    return('true');
+}
+function LMSGetLastError() {
+    logit_scorm('LMSGetLastError()',1);
+    return(G_LastError);
+}
+function LMSGetErrorString(errCode){
+    logit_scorm('LMSGetErrorString()',1);
+    return('No error !');
+}
+function LMSGetDiagnostic(errCode){
+    logit_scorm('LMSGetDiagnostic()',1);
+    return(API.LMSGetLastError());
+}
+<?php
+/**
+ * Chamilo-specific code that deals with event handling and inter-frames
+ * messaging/refreshing.
+ * Note that from now on, the Chamilo JS code in this library will act as
+ * a controller, of the MVC pattern, and receive all requests for frame
+ * updates, then redispatch to any frame concerned.
+ */
+?>
+/**
+ * Defining the AJAX-object class to be made available from other frames.
+ */
+function XAJAXobject() {
+  this.xajax_switch_item_details=xajax_switch_item_details;
+  this.switch_item=switch_item;
+}
+
+//it is not sure that the scos use the above declarations
+
+oXAJAX = new XAJAXobject();
+oxajax = new XAJAXobject();
+
+/**
+ * Cross-browser event handling by Scott Andrew
+ * @param	element	Element that needs an event attached
+ * @param   string	Event type (load, unload, click, keyDown, ...)
+ * @param   string	Function name (the event handler)
+ * @param   string	used in addEventListener
+ */
+function addEvent(elm, evType, fn, useCapture){
+    if(elm.addEventListener){
+        elm.addEventListener(evType, fn, useCapture);
+        return true;
+    }else if (elm.attachEvent){
+        var r = elm.attachEvent('on' + evType, fn);
+    }else{
+        elm['on'+evType] = fn;
+    }
+}
+/**
+ * Add listeners to the page objects. This has to be defined for
+ * the current context as it acts on objects that should exist
+ * on the page
+ */
+function addListeners(){
+    //exit if the browser doesn't support ID or tag retrieval
+    logit_lms('Entering addListeners()',2);
+    if(!document.getElementsByTagName){
+        logit_lms("getElementsByTagName not available",2);
+        return;
+    }
+    if(!document.getElementById){
+        logit_lms("getElementById not available",2);
+        return;
+    }
+    //assign event handlers to objects
+    if(lms_lp_type==1 || lms_item_type=='asset'){
+        logit_lms('Chamilo LP or asset',2);
+        // If this path is a Chamilo learnpath, then start manual save
+        // when something is loaded in there.
+        var myelem = document.getElementById('content_id');
+        if(!myelem){logit_lms("Impossible to find content_id element in document",2);}
+        addEvent(myelem,'unload',chamilo_save_asset,false);
+        logit_lms('Added event listener on content_id for unload',2);
+    }
+    logit_lms('Quitting addListeners()',2);
+}
+/**
+ * Load an item into the content frame:
+ * - making sure the previous item status have been saved
+ * - first updating the current item ID (to save the right item)
+ * - updating the frame src
+ */
+function load_item(item_id,url){
+    if(document.getElementById('content_id'))
+    {
+        logit_lms('Loading item '+item_id,2);
+        var cont_f = document.getElementById('content_id');
+        if(cont_f.src){
+            lms_old_item_id = lms_item_id;
+            var lms_new_item_id = item_id;
+            //load new content page into content frame
+            if(lms_lp_type==1 || lms_item_type=='asset'){
+                chamilo_save_asset();
+            }
+            cont_f.src = url;
+            update_toc('unhighlight',lms_old_item_id);
+            update_toc('highlight',item_id);
+            /* legacy code
+            lms_been_synchronized = 0;
+            lms_initialized = 0;
+            if(lms_lp_type==1 || lms_item_type=='asset'){
+                lms_item_id = lms_new_item_id;
+            }*/
+            return true;
+        }
+        logit_lms('cont_f.src has no properties',0);
+    }
+    logit_lms('content_id has no properties',0);
+    return false;
+}
+/**
+ * Save a Chamilo learnpath item's time and mark as completed upon
+ * leaving it
+ */
+function chamilo_save_asset(){
+    //var linkparams = 'id='+lms_item_id+'&score='+score+'&max='+max+'&min='+min+'&lesson_status='+lesson_status+'&time='+session_time+'&suspend_data='+suspend_data;
+    //var url = "<?php echo api_get_path(WEB_CODE_PATH).'lp/lp_controller.php'; ?>?action=save&" + linkparams + "";
+    logit_lms('chamilo_save_asset: '+url,0);
+    //frames["message_name"].src = url;
+    xajax_save_item(lms_lp_id, lms_user_id, lms_view_id, lms_item_id, score, max, min, lesson_status, session_time, suspend_data, lesson_location);
+}
+/**
+ * Logs information about SCORM messages into the log frame
+ * @param	string	Message to log
+ * @param	integer Priority (0 for top priority, 3 for lowest)
+ */
+function logit_scorm(message,priority) {
+    if (scorm_logs) {
+        log_in_log("SCORM: " + message);
+    }
+    return false;
+
+    /*if(frames["lp_log_name"] && scorm_logs>priority){
+        frames["lp_log_name"].document.getElementById("log_content").innerHTML += "AICC: " + message + "<br/>";
+    }*/
+}
+
+function log_in_log(message) {
+    var ua = $.browser;
+    if (ua.mozilla) {
+        console.log(message);
+    } else {
+        if (window.console) {
+            window.console.log(message);
+        }
+    }
+}
+
+/**
+ * Logs information about LMS activity into the log frame
+ * @param	string	Message to log
+ * @param	integer Priority (0 for top priority, 3 for lowest)
+ */
+function logit_lms(message,priority) {
+    /*
+    if(frames["lp_log_name"] && lms_logs>priority){
+        frames["lp_log_name"].document.getElementById("log_content").innerHTML += "LMS: " + message + "<br/>";
+    }*/
+
+    if (scorm_logs) {
+        log_in_log("LMS: " + message);
+    }
+}
+
+/**
+ * update the Table Of Contents frame, by changing CSS styles, mostly
+ * @param	string	Action to be taken
+ * @param	integer	Item id to update
+ */
+function update_toc(update_action,update_id)
+{
+    <?php if ($oLP->mode != 'fullscreen') {
+    ?>
+        var myframe = frames["toc_name"];
+        var myelem = myframe.document.getElementById("toc_"+update_id);
+        var myelemimg = myframe.document.getElementById("toc_img_"+update_id);
+        logit_lms('update_toc('+update_action+','+update_id+')',2);
+        if(update_id != 0){
+            switch(update_action){
+                case 'unhighlight':
+                    myelem.className = "scorm_item";
+                    break;
+                case 'highlight':
+                    myelem.className = "scorm_item_highlight";
+                    break;
+                case 'not attempted':
+                    if(myelemimg.src != '../img/notattempted.gif'){
+                        myelemimg.src = "../img/notattempted.gif";
+                        myelemimg.alt = "not attempted";
+                    }
+                    break;
+                case 'incomplete':
+                    if(myelemimg.src != '../img/incomplete.png'){
+                        myelemimg.src = "../img/incomplete.png";
+                        myelemimg.alt = "incomplete";
+                    }
+                    break;
+                case 'completed':
+                    if(myelemimg.src != '../img/completed.png'){
+                        myelemimg.src = "../img/completed.png";
+                        myelemimg.alt = "completed";
+                    }
+                    break;
+                case 'failed':
+                    if(myelemimg.src != '../img/failed.png'){
+                        myelemimg.src = "../img/failed.png";
+                        myelemimg.alt = "failed";
+                    }
+                    break;
+                case 'passed':
+                    if(myelemimg.src != '../img/completed.png' && myelemimg.alt != 'passed'){
+                        myelemimg.src = "../img/completed.png";
+                        myelemimg.alt = "passed";
+                    }
+                    break;
+                case 'browsed':
+                    if(myelemimg.src != '../img/completed.png' && myelemimg.alt != 'browsed'){
+                        myelemimg.src = "../img/completed.png";
+                        myelemimg.alt = "browsed";
+                    }
+                    break;
+                default:
+                    logit_lms('Update action unknown',2);
+                    break;
+            }
+        }
+        return true;
+    <?php
+} ?>
+    return true;
+}
+/**
+ * Updates the progress bar with the new status. Prevents the need of a page refresh and flickering
+ * @param	integer	Number of completed items
+ * @param	integer	Number of items in total
+ * @param	string  Display mode (absolute 'abs' or percentage '%').Defaults to %
+ */
+function update_progress_bar(nbr_complete, nbr_total, mode)
+{
+    logit_lms('update_progress_bar('+nbr_complete+','+nbr_total+','+mode+')',2);
+    logit_lms('could update with data: '+lms_lp_id+','+lms_view_id+','+lms_user_id,2);
+    var myframe = frames["nav_name"];
+    if(myframe){
+        if(mode == ''){mode='%';}
+        if(nbr_total == 0){nbr_total=1;}
+        var percentage = (nbr_complete/nbr_total)*100;
+        percentage = Math.round(percentage);
+
+        var progress_bar  = $("#progress_bar_value");
+        progress_bar.css('width', percentage +"%");
+
+    /*
+        var pr_text  = myframe.document.getElementById('progress_text');
+        var pr_full  = myframe.document.getElementById('progress_img_full');
+
+        var pr_empty = myframe.document.getElementById('progress_img_empty');
+        pr_full.width = percentage;
+        pr_empty.width = 100-percentage;
+        */
+
+        var mytext = '';
+        switch(mode){
+            case 'abs':
+                mytext = nbr_complete + '/' + nbr_total;
+                break;
+            case '%':
+            default:
+                mytext = percentage + '%';
+                break;
+        }
+        pr_text.innerHTML = mytext;
+    }
+    return true;
+}
+
+/**
+ * Updates the message frame with the given string
+ */
+function update_message_frame(msg_msg)
+{
+    if(msg_msg==null){msg_msg='';}
+    var msg_f = frames["message_name"];
+    if(!msg_f.document || !msg_f.document.getElementById('msg_div_id')){
+        logit_lms('In update_message_frame() - message frame has no document property',0);
+    }else{
+        logit_lms('In update_message_frame() - updating frame',0);
+        msg_f.document.getElementById('msg_div_id').innerHTML= msg_msg;
+    }
+}
+/**
+ * Function that handles the saving of an item and switching from an item to another.
+ * Once called, this function should be able to do the whole process of (1) saving the
+ * current item, (2) refresh all the values inside the SCORM API object, (3) open the
+ * new item into the content_id frame, (4) refresh the table of contents, (5) refresh
+ * the progress bar (completion), (6) refresh the message frame
+ * @param	integer		Chamilo ID for the current item
+ * @param	string		This parameter can be a string specifying the next
+ *						item (like 'next', 'previous', 'first' or 'last') or the id to the next item
+ */
+function switch_item(current_item, next_item){
+    /*
+    if(!current_item){
+        logit_lms('In switch - no current_item defined',0);
+    }
+    if(!next_item){
+        logit_lms('In switch - no next_item defined',0);
+    }
+    */
+    if(lms_item_id == next_item){
+        return; //nothing to switch
+    }
+    //(1) save the current item
+    logit_lms('Called switch_item with params '+lms_item_id+' and '+next_item+'',0);
+    xajax_save_item(lms_lp_id, lms_user_id, lms_view_id, lms_item_id, score, max, min, lesson_status, session_time, suspend_data, lesson_location);
+
+    //(2) Refresh all the values inside this SCORM API object - use AJAX
+    xajax_switch_item_details(lms_lp_id,lms_user_id,lms_view_id,lms_item_id,next_item);
+
+    //(3) open the new item in the content_id frame
+    var cont_f = document.getElementById('content_id');
+    if(!cont_f){logit_lms('In switch - content frame not found',0);return false;}
+    switch(next_item){
+        case 'next':
+            next_item = lms_next_item;
+            break;
+        case 'previous':
+            next_item = lms_previous_item;
+            break;
+        default:
+            break;
+    }
+    cont_f.src = 'lp_controller.php?action=content&lp_id='+lms_lp_id+'&item_id='+next_item;
+
+    //(4) refresh table of contents
+    /*
+    var toc_f = document.getElementById('toc_id');
+    if(!toc_f){logit_lms('In switch - toc frame not found',0);return false;}
+    var myrefresh = toc_f.src;
+    toc_f.src = myrefresh;
+    */
+
+    //(5) refresh the progress bar
+    /*
+    var prg_f = document.getElementById('nav_id');
+    if(!prg_f){logit_lms('In switch - navigation frame not found',0);return false;}
+    var myrefresh = prg_f.src;
+    prg_f.src = myrefresh;
+    */
+
+    //(6) refresh the message box (included in switch_item_details)
+    return true;
+}
+/**
+ * Save a specific item (with its interactions, if any) into the LMS through
+ * an AJAX call. Originally, we used the xajax library. Now we use jQuery.
+ * Because of the need to pass an array, we have to build the parameters
+ * manually into GET[]
+ */
+function xajax_save_item(lms_lp_id, lms_user_id, lms_view_id, lms_item_id, score, max, min, lesson_status, session_time, suspend_data, lesson_location, interactions, lms_item_core_exit) {
+        params='';
+        params += 'lid='+lms_lp_id+'&uid='+lms_user_id+'&vid='+lms_view_id;
+        params += '&iid='+lms_item_id+'&s='+score+'&max='+max+'&min='+min;
+        params += '&status='+lesson_status+'&t='+session_time;
+        params += '&suspend='+suspend_data+'&loc='+lesson_location;
+        params += '&core_exit='+lms_item_core_exit;
+        interact_string = '';
+        for (i in interactions){
+            interact_string += '&interact['+i+']=';
+            interact_temp = '[';
+            for (j in interactions[i]) {
+                interact_temp += interactions[i][j]+',';
+            }
+            interact_temp = interact_temp.substr(0,(interact_temp.length-2)) + ']';
+            interact_string += encodeURIComponent(interact_temp);
+        }
+        //interact_string = encodeURIComponent(interact_string.substr(0,(interact_string.length-1)));
+        params += interact_string;
+        /*params = {
+            'lid': lms_lp_id,
+            'uid': lms_user_id,
+            'vid': lms_view_id,
+            'iid': lms_item_id,
+            's': score,
+            'max': max,
+            'min': min,
+            'status': lesson_status,
+            't': session_time,
+            'suspend': suspend_data,
+            'loc': lesson_location,
+            'interact': interac_string,
+            'core_exit': lms_item_core_exit
+        }
+        */
+        $.ajax({
+            type:"POST",
+            data: params,
+            url: "lp_ajax_save_item.php",
+            dataType: "script",
+            async: false
+            }
+        );
+}
+/**
+ * Starts the timer with the server clock time.
+ * Originally, we used the xajax library. Now we use jQuery
+ */
+function xajax_start_timer() {
+    $.ajax({
+        type: "GET",
+        url: "lp_ajax_start_timer.php",
+        dataType: "script",
+        async: false
+    });
+}
+/**
+ * Save a specific item's objectives into the LMS through
+ * an AJAX call. Originally, we used the xajax library. Now we use jQuery
+ */
+function xajax_save_objectives(lms_lp_id,lms_user_id,lms_view_id,lms_item_id,item_objectives) {
+        params='';
+        params += 'lid='+lms_lp_id+'&uid='+lms_user_id+'&vid='+lms_view_id;
+        params += '&iid='+lms_item_id;
+        obj_string = '';
+        for (i in item_objectives){
+            obj_string += '&objectives['+i+']=';
+            obj_temp = '[';
+            for (j in item_objectives[i]) {
+                obj_temp += item_objectives[i][j]+',';
+            }
+            obj_temp = obj_temp.substr(0,(obj_temp.length-2)) + ']';
+            obj_string += encodeURIComponent(obj_temp);
+        }
+        params += obj_string;
+        $.ajax({
+            type: "POST",
+            data: params,
+            url: "lp_ajax_save_objectives.php",
+            dataType: "script",
+            async: false
+        });
+}
+/**
+ * Switch between two items through
+ * an AJAX call. Originally, we used the xajax library. Now we use jQuery
+ */
+function xajax_switch_item_details(lms_lp_id,lms_user_id,lms_view_id,lms_item_id,next_item) {
+    params = {
+        'lid': lms_lp_id,
+        'uid': lms_user_id,
+        'vid': lms_view_id,
+        'iid': lms_item_id,
+        'next': next_item
+    }
+    $.ajax({
+        type: "POST",
+        data: params,
+        url: "lp_ajax_switch_item.php",
+        dataType: "script",
+        async: false
+    });
+}
+addEvent(window,'load',addListeners,false);