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649 lines
22 KiB
649 lines
22 KiB
/**
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* Wrapper to the SCORM API provided by Chamilo
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* The complete set of functions and variables are in this file to avoid unnecessary file
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* accesses.
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* Only event triggers and answer data are inserted into the final document.
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* @author Yannick Warnier - inspired by the ADLNet documentation on SCORM content-side API
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* @package scorm.js
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*/
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/**
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* Initialisation of the SCORM API section.
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* Find the SCO functions (startTimer, computeTime, etc in the second section)
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* Find the Chamilo-proper functions (checkAnswers, etc in the third section)
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*/
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var _debug = true;
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var findAPITries = 0;
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var _apiHandle = null; //private variable
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var errMsgLocate = "Unable to locate the LMS's API implementation";
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var _NoError = 0;
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var _GeneralException = 101;
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var _ServerBusy = 102;
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var _InvalidArgumentError = 201;
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var _ElementCannotHaveChildren = 202;
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var _ElementIsNotAnArray = 203;
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var _NotInitialized = 301;
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var _NotImplementedError = 401;
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var _InvalidSetValue = 402;
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var _ElementIsReadOnly = 403;
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var _ElementIsWriteOnly = 404;
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var _IncorrectDataType = 405;
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/**
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* Gets the API handle right into the local API object and ensure there is only one.
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* Using the singleton pattern to ensure there's only one API object.
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* @return object The API object as given by the LMS
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*/
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var API = new function()
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{
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if (_apiHandle == null) {
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_apiHandle = getAPI();
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}
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return _apiHandle;
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}
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/**
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* Finds the API on the LMS side or gives up giving an error message
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* @param object The window/frame object in which we are searching for the SCORM API
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* @return object The API object recovered from the LMS's implementation of the SCORM API
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*/
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function findAPI(win)
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{
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while((win.API == null) && (win.parent != null) && (win.parent != win)) {
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findAPITries++;
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if (findAPITries>10) {
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alert("Error finding API - too deeply nested");
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return null;
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}
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win = win.parent
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}
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return win.API;
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}
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/**
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* Gets the API from the current window/frame or from parent objects if not found
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* @return object The API object recovered from the LMS's implementation of the SCORM API
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*/
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function getAPI()
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{
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//window is the global/root object of the current window/frame
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var MyAPI = findAPI(window);
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//look through parents if any
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if ((MyAPI == null) && (window.opener != null) && (typeof(window.opener) != "undefined")) {
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MyAPI = findAPI(window.opener);
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}
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//still not found? error message
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if (MyAPI == null) {
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alert("Unable to find SCORM API adapter.\nPlease check your LMS is considering this page as SCORM and providing the right JavaScript interface.")
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}
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return MyAPI;
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}
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/**
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* Handles error codes (prints the error if it has a description)
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* @return int Error code from LMS's API
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*/
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function ErrorHandler()
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{
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if (API == null) {
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alert("Unable to locate the LMS's API. Cannot determine LMS error code");
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return;
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}
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var errCode = API.LMSGetLastError().toString();
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if (errCode != _NoError) {
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if (errCode == _NotImplementedError) {
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var errDescription = "The LMS doesn't support this feature";
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if (_debug) {
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errDescription += "\n";
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errDescription += api.LMSGetDiagnostic(null);
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}
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console.log(errDescription);
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} else {
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var errDescription = API.LMSGetErrorString(errCode);
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if (_debug) {
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errDescription += "\n";
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errDescription += api.LMSGetDiagnostic(null);
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}
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console.log(errDescription);
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}
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}
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return errCode;
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}
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/**
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* Calls the LMSInitialize method of the LMS's API object
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* @return string The string value of the LMS returned value or false if error (should be "true" otherwise)
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*/
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function doLMSInitialize()
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSInitialize failed");
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return false;
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}
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var result = API.LMSInitialize("");
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if (result.toString() != "true") {
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var err = ErrorHandler();
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}
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return result.toString();
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}
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/**
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* Calls the LMSFinish method of the LMS's API object
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* @return string The string value of the LMS return value, or false if error (should be "true" otherwise)
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*/
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function doLMSFinish()
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSFinish failed");
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return false;
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} else {
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var result = API.LMSFinish('');
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if (result.toString() != "true") {
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var err = ErrorHandler();
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}
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}
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return result.toString();
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}
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/**
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* Calls the LMSGetValue method
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* @param string The name of the SCORM parameter to get
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* @return string The value returned by the LMS
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*/
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function doLMSGetValue(name)
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSGetValue was not successful.");
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return "";
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} else {
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var value = API.LMSGetValue(name);
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var errCode = API.LMSGetLastError().toString();
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if (errCode != _NoError) {
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// an error was encountered so display the error description
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var errDescription = API.LMSGetErrorString(errCode);
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alert("LMSGetValue(" + name + ") failed. \n" + errDescription);
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return "";
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}
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}
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}
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/**
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* Calls the LMSSetValue method of the API object
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* @param string The name of the SCORM parameter to set
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* @param string The value to set the parameter to
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* @return void
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*/
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function doLMSSetValue(name, value)
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{
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if (API == null) {
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alert("Unable to locate the LMS's API Implementation.\nLMSSetValue was not successful.");
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return;
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} else {
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var result = API.LMSSetValue(name, value);
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if (result.toString() != "true") {
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var err = ErrorHandler();
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}
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}
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return;
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}
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/**
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* Calls the LMSCommit method
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*/
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function doLMSCommit()
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSCommit was not successful.");
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return "false";
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} else {
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var result = API.LMSCommit("");
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if (result != "true") {
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var err = ErrorHandler();
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}
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}
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return result.toString();
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}
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/**
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* Calls GetLastError()
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*/
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function doLMSGetLastError()
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSGetLastError was not successful.");
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//since we can't get the error code from the LMS, return a general error
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return _GeneralError;
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}
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return API.LMSGetLastError().toString();
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}
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/**
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* Calls LMSGetErrorString()
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*/
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function doLMSGetErrorString(errorCode)
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSGetErrorString was not successful.");
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}
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return API.LMSGetErrorString(errorCode).toString();
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}
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/**
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* Calls LMSGetDiagnostic()
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*/
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function doLMSGetDiagnostic(errorCode)
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{
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if (API == null) {
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alert(errMsgLocate + "\nLMSGetDiagnostic was not successful.");
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}
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return API.LMSGetDiagnostic(errorCode).toString();
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}
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/**
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* Second section. The SCO functions are located here (handle time and score messaging to SCORM API)
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* Initialisation
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*/
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var startTime;
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var exitPageStatus;
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/**
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* Initialise page values
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*/
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function loadPage()
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{
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var result = doLMSInitialize();
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if (result) {
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var status = doLMSGetValue("cmi.core.lesson_status");
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if (status == "not attempted") {
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doLMSSetValue("cmi.core.lesson_status", "incomplete");
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}
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exitPageStatus = false;
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startTimer();
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}
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}
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/**
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* Starts the local timer
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*/
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function startTimer()
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{
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startTime = new Date().getTime();
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}
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/**
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* Calculates the total time and sends the result to the LMS
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*/
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function computeTime()
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{
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if (startTime != 0) {
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var currentDate = new Date().getTime();
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var elapsedSeconds = ( (currentDate - startTime) / 1000 );
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var formattedTime = convertTotalSeconds(elapsedSeconds);
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} else {
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formattedTime = "00:00:00.0";
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}
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doLMSSetValue( "cmi.core.session_time", formattedTime );
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}
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/**
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* Formats the time in a SCORM time format
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*/
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function convertTotalSeconds(ts)
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{
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var sec = (ts % 60);
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ts -= sec;
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var tmp = (ts % 3600); //# of seconds in the total # of minutes
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ts -= tmp; //# of seconds in the total # of hours
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// convert seconds to conform to CMITimespan type (e.g. SS.00)
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sec = Math.round(sec*100)/100;
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var strSec = new String(sec);
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var strWholeSec = strSec;
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var strFractionSec = "";
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if (strSec.indexOf(".") != -1) {
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strWholeSec = strSec.substring(0, strSec.indexOf("."));
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strFractionSec = strSec.substring(strSec.indexOf(".") + 1, strSec.length);
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}
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if (strWholeSec.length < 2) {
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strWholeSec = "0" + strWholeSec;
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}
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strSec = strWholeSec;
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if (strFractionSec.length) {
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strSec = strSec + "." + strFractionSec;
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}
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if ((ts % 3600) != 0)
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var hour = 0;
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else var hour = (ts / 3600);
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if ((tmp % 60) != 0)
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var min = 0;
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else var min = (tmp / 60);
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if ((new String(hour)).length < 2)
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hour = "0" + hour;
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if ((new String(min)).length < 2)
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min = "0" + min;
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var rtnVal = hour + ":" + min + ":" + strSec;
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return rtnVal
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}
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/**
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* Handles the use of the back button (saves data and closes SCO)
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*/
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function doBack()
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{
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checkAnswers(true);
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doLMSSetValue( "cmi.core.exit", "suspend" );
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computeTime();
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exitPageStatus = true;
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var result;
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result = doLMSCommit();
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result = doLMSFinish();
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}
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/**
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* Handles the closure of the current SCO before an interruption. This is only useful if the LMS
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* deals with the cmi.core.exit, cmi.core.lesson_status and cmi.core.lesson_mode *and* the SCO
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* sends some kind of value for cmi.core.exit, which is not the case here (yet).
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*/
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function doContinue(status)
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{
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// Reinitialize Exit to blank
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doLMSSetValue( "cmi.core.exit", "" );
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var mode = doLMSGetValue( "cmi.core.lesson_mode" );
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if ( mode != "review" && mode != "browse" )
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{
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doLMSSetValue( "cmi.core.lesson_status", status );
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}
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computeTime();
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exitPageStatus = true;
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var result;
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result = doLMSCommit();
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result = doLMSFinish();
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}
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/**
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* handles the recording of everything on a normal shutdown
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*/
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function doQuit()
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{
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checkAnswers();
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computeTime();
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exitPageStatus = true;
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var result;
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result = doLMSCommit();
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result = doLMSFinish();
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}
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/**
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* Called upon unload event from body element
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*/
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function unloadPage(status)
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{
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if (!exitPageStatus)
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{
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// doQuit( status );
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}
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}
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/**
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* Third section - depending on Chamilo - check answers and set score
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*/
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var questions = new Array();
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var questions_answers = new Array();
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var questions_answers_correct = new Array();
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var questions_types = new Array();
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var questions_score_max = new Array();
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var questions_answers_ponderation = new Array();
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/**
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* Checks the answers on the test formular page
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*/
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function checkAnswers(interrupted)
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{
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var tmpScore = 0;
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var status = 'not attempted';
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var scoreMax = 0;
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if (_debug) {
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console.log('questions_answers_correct:');
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console.log(questions_answers_correct);
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}
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for (var i=0; i < questions.length; i++) {
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if (questions[i] != undefined && questions[i] != null){
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var idQuestion = questions[i];
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var type = questions_types[idQuestion];
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var interactionScore = 0;
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var interactionAnswers = '';
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var interactionCorrectResponses = '';
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var interactionType = '';
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if (_debug) {
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console.log('Type: ' +type);
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console.log('idQuestion: ' +idQuestion);
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console.log('questions_answers: ');
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console.log(questions_answers[idQuestion]);
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console.log('questions_answers_ponderation: ');
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console.log(questions_answers_ponderation[idQuestion]);
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console.log('questions_answers_correct: ');
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console.log(questions_answers_correct[idQuestion]);
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}
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if (type == 'mcma') {
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interactionType = 'choice';
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var myScore = 0;
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for(var j=0; j<questions_answers[idQuestion].length;j++) {
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var idAnswer = questions_answers[idQuestion][j];
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var answer = document.getElementById('question_'+(idQuestion)+'_multiple_'+(idAnswer));
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if (answer.checked) {
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interactionAnswers += idAnswer+'__|';// changed by isaac flores
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myScore += questions_answers_ponderation[idQuestion][idAnswer];
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}
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}
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interactionScore = myScore;
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scoreMax += questions_score_max[idQuestion];
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if (_debug) {
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console.log("Score: "+myScore);
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}
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} else if (type == 'mcua') {
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interactionType = 'choice';
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var myScore = 0;
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for (var j=0; j<questions_answers[idQuestion].length;j++) {
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var idAnswer = questions_answers[idQuestion][j];
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var answer = document.getElementById('question_'+(idQuestion)+'_unique_'+(idAnswer));
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if (answer.checked) {
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interactionAnswers += idAnswer;
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if (_debug) {
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console.log("idAnswer: "+idAnswer);
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console.log("questions_answers_correct: "+questions_answers_correct[idQuestion][idAnswer]);
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}
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if (questions_answers_correct[idQuestion][idAnswer] == idAnswer) {
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if (questions_answers_ponderation[idQuestion][idAnswer]) {
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myScore += questions_answers_ponderation[idQuestion][idAnswer];
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} else {
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myScore++;
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}
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}
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}
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}
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if (_debug) {
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console.log("Score: "+myScore);
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}
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interactionScore = myScore;
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scoreMax += questions_score_max[idQuestion];
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} else if (type == 'tf') {
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interactionType = 'true-false';
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var myScore = 0;
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for (var j = 0; j < questions_answers[idQuestion].length; j++) {
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var idAnswer = questions_answers[idQuestion][j];
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var answer = document.getElementById('question_' + idQuestion + '_tf_' + (idAnswer));
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if (answer.checked.value) {
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interactionAnswers += idAnswer;
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for (k = 0; k < questions_answers_correct[idQuestion].length; k++) {
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if (questions_answers_correct[idQuestion][k] == idAnswer) {
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if (questions_answers_ponderation[idQuestion][idAnswer]) {
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myScore += questions_answers_ponderation[idQuestion][idAnswer];
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} else {
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myScore++;
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}
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}
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}
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}
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}
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if (_debug) {
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console.log("Score: "+myScore);
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}
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interactionScore = myScore;
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scoreMax += questions_score_max[idQuestion];
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} else if (type == 'fib') {
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interactionType = 'fill-in';
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var myScore = 0;
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for (var j = 0; j < questions_answers[idQuestion].length; j++) {
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var idAnswer = questions_answers[idQuestion][j];
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var answer = document.getElementById('question_'+(idQuestion)+'_fib_'+(idAnswer));
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if (answer.value) {
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interactionAnswers += answer.value + '__|';//changed by isaac flores
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for (k = 0; k < questions_answers_correct[idQuestion].length; k++) {
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if (questions_answers_correct[idQuestion][k] == answer.value) {
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if (questions_answers_ponderation[idQuestion][idAnswer]) {
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myScore += questions_answers_ponderation[idQuestion][idAnswer];
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} else {
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myScore++;
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}
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}
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}
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}
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}
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if (_debug) {
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console.log("Score: "+myScore);
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}
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interactionScore = myScore;
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scoreMax += questions_score_max[idQuestion];
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} else if (type == 'matching') {
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interactionType = 'matching';
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var myScore = 0;
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for (var j = 0; j < questions_answers[idQuestion].length; j++) {
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var idAnswer = questions_answers[idQuestion][j];
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var answer = document.getElementById('question_' + (idQuestion) + '_matching_' + (idAnswer));
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if (answer && answer.value) {
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interactionAnswers += answer.value + '__|';//changed by isaac flores
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for (k = 0; k < questions_answers_correct[idQuestion].length; k++) {
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var left = questions_answers_correct[idQuestion][k][0];
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var right = questions_answers_correct[idQuestion][k][1];
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if (left == idAnswer && right == answer.value) {
|
|
if (questions_answers_ponderation[idQuestion][idAnswer]) {
|
|
myScore += questions_answers_ponderation[idQuestion][idAnswer];
|
|
} else {
|
|
myScore++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (_debug) {
|
|
console.log("Score: "+myScore);
|
|
}
|
|
interactionScore = myScore;
|
|
scoreMax += questions_score_max[idQuestion];
|
|
} else if (type == 'free') {
|
|
//ignore for now as a score cannot be given
|
|
interactionType = 'free';
|
|
var answer = document.getElementById('question_'+(idQuestion)+'_free');
|
|
if (answer && answer.value) {
|
|
interactionAnswers += answer.value
|
|
}
|
|
|
|
//interactionScore = questions_score_max[idQuestion];
|
|
interactionScore = 0;
|
|
scoreMax += questions_score_max[idQuestion];
|
|
|
|
//interactionAnswers = document.getElementById('question_'+(idQuestion)+'_free').value;
|
|
//correct responses work by pattern, see SCORM Runtime Env Doc
|
|
//interactionCorrectResponses += questions_answers_correct[idQuestion].toString();
|
|
} else if (type == 'hotspot') {
|
|
interactionType = 'sequencing';
|
|
interactionScore = 0;
|
|
//if(question_score && question_score[idQuestion]){
|
|
// interactionScore = question_score[idQuestion];
|
|
//} //else, 0
|
|
//interactionAnswers = document.getElementById('question_'+(idQuestion)+'_free').innerHTML;
|
|
//correct responses work by pattern, see SCORM Runtime Env Doc
|
|
//for(k=0;k<questions_answers_correct[idQuestion].length;k++)
|
|
//{
|
|
// interactionCorrectResponses += questions_answers_correct[idQuestion][k].toString()+',';
|
|
//}
|
|
} else if (type == 'exact') {
|
|
interactionType = 'exact';
|
|
interactionScore = 0;
|
|
var real_answers = new Array();
|
|
for (var j = 0; j < questions_answers[idQuestion].length; j++) {
|
|
var idAnswer = questions_answers[idQuestion][j];
|
|
var answer = document.getElementById('question_' + (idQuestion) + '_exact_' + (idAnswer));
|
|
|
|
if (answer.checked == true) {
|
|
interactionAnswers += idAnswer+', ';
|
|
if (questions_answers_correct[idQuestion][idAnswer] != 0) {
|
|
real_answers[j] = true;
|
|
} else {
|
|
real_answers[j] = false;
|
|
}
|
|
} else {
|
|
if (questions_answers_correct[idQuestion][idAnswer] != 0) {
|
|
real_answers[j] = false;
|
|
} else {
|
|
real_answers[j] = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
var final_answer = true;
|
|
for (var z = 0; z < real_answers.length; z++) {
|
|
if (real_answers[z] == false) {
|
|
final_answer = false;
|
|
}
|
|
}
|
|
interactionScore = 0;
|
|
console.log(real_answers);
|
|
if (final_answer) {
|
|
//getting only the first score where we save the weight of all the question
|
|
interactionScore = questions_answers_ponderation[idQuestion][1];
|
|
}
|
|
if (_debug) {
|
|
console.log("Score: "+interactionScore);
|
|
}
|
|
scoreMax += questions_score_max[idQuestion];
|
|
}
|
|
tmpScore += interactionScore;
|
|
|
|
doLMSSetValue('cmi.interactions.'+idQuestion+'.id', 'Q'+idQuestion);
|
|
doLMSSetValue('cmi.interactions.'+idQuestion+'.type', interactionType);
|
|
doLMSSetValue('cmi.interactions.'+idQuestion+'.student_response', interactionAnswers);
|
|
doLMSSetValue('cmi.interactions.'+idQuestion+'.result', interactionScore);
|
|
}
|
|
}
|
|
doLMSSetValue('cmi.core.score.min', 0);
|
|
doLMSSetValue('cmi.core.score.max', scoreMax);
|
|
doLMSSetValue('cmi.core.score.raw', tmpScore);
|
|
|
|
//get status
|
|
var mastery_score = doLMSGetValue('cmi.student_data.mastery_score');
|
|
if (mastery_score <= 0) {
|
|
mastery_score = (scoreMax * 0.80);
|
|
}
|
|
if (tmpScore > mastery_score) {
|
|
status = 'passed';
|
|
} else {
|
|
status = 'failed';
|
|
}
|
|
|
|
if (_debug) {
|
|
console.log('student_score: ' + tmpScore);
|
|
console.log('mastery_score: ' + mastery_score);
|
|
console.log('cmi.core.score.max: ' + scoreMax);
|
|
console.log('cmi.core.lesson_status: ' + status);
|
|
}
|
|
|
|
doLMSSetValue('cmi.core.lesson_status', status);
|
|
|
|
if (interrupted && (status != 'completed') && (status != 'passed')) {
|
|
doLMSSetValue('cmi.core.exit', 'suspended');
|
|
}
|
|
|
|
return false; //do not submit the form
|
|
}
|
|
|