h5p-php-library/js/h5p-x-api.js

75 lines
2.4 KiB
JavaScript

var H5P = H5P || {};
// Create object where external code may register and listen for H5P Events
H5P.externalDispatcher = new H5P.EventDispatcher();
if (window.top !== window.self && window.top.H5P !== undefined && window.top.H5P.externalDispatcher !== undefined) {
H5P.externalDispatcher.on('xAPI', window.top.H5P.externalDispatcher.trigger);
}
// EventDispatcher extensions
/**
* Helper function for triggering xAPI added to the EventDispatcher
*
* @param {string} verb - the short id of the verb we want to trigger
* @param {oject} extra - extra properties for the xAPI statement
*/
H5P.EventDispatcher.prototype.triggerXAPI = function(verb, extra) {
this.trigger(this.createXAPIEventTemplate(verb, extra));
};
/**
* Helper function to create event templates added to the EventDispatcher
*
* Will in the future be used to add representations of the questions to the
* statements.
*
* @param {string} verb - verb id in short form
* @param {object} extra - Extra values to be added to the statement
* @returns {Function} - XAPIEvent object
*/
H5P.EventDispatcher.prototype.createXAPIEventTemplate = function(verb, extra) {
var event = new H5P.XAPIEvent();
event.setActor();
event.setVerb(verb);
if (extra !== undefined) {
for (var i in extra) {
event.data.statement[i] = extra[i];
}
}
if (!('object' in event)) {
event.setObject(this);
}
return event;
};
/**
* Helper function to create xAPI completed events
*
* @param {int} score - will be set as the 'raw' value of the score object
* @param {int} maxScore - will be set as the "max" value of the score object
*/
H5P.EventDispatcher.prototype.triggerXAPICompleted = function(score, maxScore) {
var event = this.createXAPIEventTemplate('completed');
event.setScoredResult(score, maxScore);
this.trigger(event);
}
/**
* Internal H5P function listening for xAPI completed events and stores scores
*
* @param {function} event - xAPI event
*/
H5P.xAPICompletedListener = function(event) {
var statement = event.data.statement;
if ('verb' in statement) {
if (statement.verb.id === 'http://adlnet.gov/expapi/verbs/completed') {
var score = statement.result.score.raw;
var maxScore = statement.result.score.max;
var contentId = statement.object.extensions['http://h5p.org/x-api/h5p-local-content-id'];
H5P.setFinished(contentId, score, maxScore);
}
}
};