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let findAPITries = 0;
// Find SCORM 1.2 API algorithm taken from the SCORM documentation at:
// https://scorm.com/scorm-explained/technical-scorm/run-time/api-discovery-algorithms/
function findAPI(win) {
// Check to see if the window (win) contains the API
// if the window (win) does not contain the API and
// the window (win) has a parent window and the parent window
// is not the same as the window (win)
while ( (win.API == null) && (win.parent != null) && (win.parent != win) )
{
// increment the number of findAPITries
findAPITries++;
// Note: 7 is an arbitrary number, but should be more than sufficient
if (findAPITries > 7)
{
alert("Error finding API -- too deeply nested.");
return null;
}
// set the variable that represents the window being
// being searched to be the parent of the current window
// then search for the API again
win = win.parent;
}
return win.API;
}
function _getAPI() {
// start by looking for the API in the current window
var theAPI = findAPI(window);
// if the API is null (could not be found in the current window)
// and the current window has an opener window
if ( (theAPI == null) && (window.opener != null) && (typeof(window.opener) != "undefined") )
{
// try to find the API in the current window’s opener
theAPI = findAPI(window.opener);
}
// if the API has not been found
if (theAPI == null)
{
// Alert the user that the API Adapter could not be found
alert("Unable to find an API adapter");
}
return theAPI;
}
// SCORM 1.2 defines a bool as a string with the values "true" or "false"
function isScormTrue(b) {
return b === "true";
}
class Scorm {
api = null;
// ensure LMSInitialize is only called once.
initialized = false;
// ensure LMSFinish is only called once.
finished = false;
getAPI() {
if (this.api === null) {
this.api = _getAPI();
}
return this.api;
}
initialize() {
if (this.initialized) return true;
const api = this.getAPI();
if (!api) {
console.warn("SCORM API not found");
return false;
}
const r = api.LMSInitialize("");
this.initialized = isScormTrue(r);
return this.initialized;
}
finish() {
if (this.finished) return true;
const api = this.getAPI();
if (!api) return false;
const r = api.LMSFinish("");
this.finished = isScormTrue(r);
return this.finished;
}
getValue(el) {
const api = this.getAPI();
if (!api) return null;
return api.LMSGetValue(el);
}
setValue(el, val) {
const api = this.getAPI();
if (!api) return false;
const r = api.LMSSetValue(el, String(val));
return isScormTrue(r);
};
commit() {
const api = this.getAPI();
if (!api) return false;
const r = api.LMSCommit("");
return isScormTrue(r);
}
setScore(raw, min, max) {
this.setValue("cmi.core.score.raw", raw);
if (min !== null) this.setValue("cmi.core.score.min", min);
if (max !== null) this.setValue("cmi.core.score.max", max);
this.commit();
}
}
window.SCORM = new Scorm();
window.addEventListener("load", function() {
window.SCORM.initialize();
});
// Finish on the before unloading the SCORM content as advised by the documentation:
// https://scorm.com/scorm-explained/technical-scorm/run-time/
window.addEventListener("beforeunload", function() {
window.SCORM.commit();
window.SCORM.finish();
});
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