h5p-question-set/js/questionset.js

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JavaScript
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var H5P = H5P || {};
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/**
* Will render a Question with multiple choices for answers.
*
* Events provided:
* - h5pQuestionSetFinished: Triggered when a question is finished. (User presses Finish-button)
*
* @param {Array} options
* @param {int} contentId
* @returns {H5P.QuestionSet} Instance
*/
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H5P.QuestionSet = function (options, contentId) {
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if (!(this instanceof H5P.QuestionSet)) {
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return new H5P.QuestionSet(options, contentId);
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}
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var $ = H5P.jQuery;
var cp = H5P.getContentPath(contentId);
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var texttemplate =
'<% if (introPage.showIntroPage) { %>' +
'<div class="intro-page">' +
' <div class="title"><%= introPage.title %></div>' +
' <div class="introduction"><%= introPage.introduction %></div>' +
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' <div class="buttons"><a class="qs-startbutton button"><%= introPage.startButtonText %></a></div>' +
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'</div>' +
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'<% } %>' +
'<div class="questionset<% if (introPage.showIntroPage) { %> hidden<% } %>">' +
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' <% for (var i=0; i<questions.length; i++) { %>' +
' <div class="question-container">' +
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' <div><%= questions[i].library %></div>' +
' </div>' +
' <% } %>' +
' <div class="qs-footer">' +
' <div class="qs-progress">' +
' <% if (progressType == "dots") { %>' +
' <div class="dots-container">' +
' <% for (var i=0; i<questions.length; i++) { %>' +
' <span class="progress-dot unanswered"></span>' +
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' <%} %>' +
' </div>' +
' <% } else if (progressType == "textual") { %>' +
' <span class="progress-text"></span>' +
' <% } %>' +
' </div>' +
' <a class="prev button"><%= texts.prevButton %></a>' +
' <a class="next button"><%= texts.nextButton %></a>' +
' <a class="finish button"><%= texts.finishButton %></a>' +
' </div>' +
'</div>';
var resulttemplate =
'<div class="questionset-results">' +
' <div class="greeting"><%= greeting %></div>' +
' <div class="score <%= scoreclass %>"><%= score %></div>' +
' <div class="resulttext <%= scoreclass %>"><%= resulttext %></div>' +
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' <div class="buttons"><a class="button qs-finishbutton"><%= finishButtonText %></a><a class="button qs-solutionbutton"><%= solutionButtonText %></a></div>' +
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'</div>';
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var defaults = {
randomOrder: false,
initialQuestion: 0,
backgroundImage: undefined,
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progressType: 'dots',
passPercentage: 50,
questions: [],
introPage: {
showIntroPage: false,
title: '',
introduction: '',
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startButtonText: 'Start'
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},
texts: {
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prevButton: 'Previous',
nextButton: 'Next',
finishButton: 'Finish',
textualProgress: 'Question: @current of @total questions'
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},
endGame: {
showResultPage: true,
successGreeting: 'Congratulations!',
successComment: 'You have enough correct answers to pass the test.',
failGreeting: 'Sorry!',
failComment: "You don't have enough correct answers to pass this test.",
scoreString: '@score/@total',
finishButtonText: 'Finish',
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solutionButtonText: 'Show solution',
showAnimations: false,
successVideo: undefined,
failVideo: undefined
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}
};
var template = new EJS({text: texttemplate});
var endTemplate = new EJS({text: resulttemplate});
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var params = $.extend(true, {}, defaults, options);
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var currentQuestion = 0;
var questionInstances = new Array();
var $myDom;
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renderSolutions = false;
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// if (params.randomOrder) {
// // TODO: Randomize order of questions
// }
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// Instantiate question instances
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for (var i = 0; i < params.questions.length; i++) {
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var question = params.questions[i];
// TODO: Render on init, inject in template.
var libraryObject = H5P.libraryFromString(question.library);
var tmp = new (H5P.classFromName(libraryObject.machineName))(question.params, contentId);
questionInstances.push(tmp);
}
// Update button state.
var _updateButtons = function () {
var answered = true;
for (var i = questionInstances.length - 1; i >= 0; i--) {
answered = answered && (questionInstances[i]).getAnswerGiven();
}
if (currentQuestion === 0) {
$('.prev.button', $myDom).hide();
} else {
$('.prev.button', $myDom).show();
}
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if (currentQuestion === (params.questions.length - 1)) {
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$('.next.button', $myDom).hide();
if (answered) {
$('.finish.button', $myDom).show();
}
} else {
$('.next.button', $myDom).show();
$('.finish.button', $myDom).hide();
}
};
var _showQuestion = function (questionNumber) {
// Sanitize input.
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if (questionNumber < 0) {
questionNumber = 0;
}
if (questionNumber >= params.questions.length) {
questionNumber = params.questions.length - 1;
}
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// Hide all questions
$('.question-container', $myDom).hide().eq(questionNumber).show();
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// Update progress indicator
// Test if current has been answered.
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if (params.progressType === 'textual') {
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$('.progress-text', $myDom).text(params.texts.textualProgress.replace("@current", questionNumber+1).replace("@total", params.questions.length));
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}
else {
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// Set currentNess
$('.progress-dot.current', $myDom).removeClass('current');
$('.progress-dot:eq(' + questionNumber +')', $myDom).addClass('current');
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}
// Remember where we are
currentQuestion = questionNumber;
_updateButtons();
return currentQuestion;
};
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var showSolutions = function () {
for (var i = 0; i < questionInstances.length; i++) {
questionInstances[i].showSolutions();
}
};
var rendered = false;
var reRender = function () {
rendered = false;
};
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var _displayEndGame = function () {
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if (rendered) {
$myDom.children().hide().filter('.questionset-results').show();
return;
}
rendered = true;
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// Get total score.
var finals = getScore();
var totals = totalScore();
var scoreString = params.endGame.scoreString.replace("@score", finals).replace("@total", totals);
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var success = ((100 * finals / totals) >= params.passPercentage);
var eventData = {
score: scoreString,
passed: success
};
var displayResults = function () {
if (!params.endGame.showResultPage) {
$(returnObject).trigger('h5pQuestionSetFinished', eventData);
return;
}
var eparams = {
greeting: (success ? params.endGame.successGreeting : params.endGame.failGreeting),
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score: scoreString,
scoreclass: (success ? 'success' : 'fail'),
resulttext: (success ? params.endGame.successComment : params.endGame.failComment),
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finishButtonText: params.endGame.finishButtonText,
solutionButtonText: params.endGame.solutionButtonText
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};
// Show result page.
$myDom.children().hide();
$myDom.append(endTemplate.render(eparams));
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$('.qs-finishbutton').click(function () {
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$(returnObject).trigger('h5pQuestionSetFinished', eventData);
});
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$('.qs-solutionbutton', $myDom).click(function () {
showSolutions();
$myDom.children().hide().filter('.questionset').show();
_showQuestion(params.initialQuestion);
});
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};
if (params.endGame.showAnimations) {
var videoData = success ? params.endGame.successVideo : params.endGame.failVideo;
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if (videoData) {
$myDom.children().hide();
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var $videoContainer = $('<div class="video-container"></div>').appendTo($myDom);
var video = new H5P.Video({
files: videoData,
fitToWrapper: true,
controls: false,
autoplay: true
}, cp);
video.endedCallback = function () {
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displayResults();
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$videoContainer.hide();
};
video.attach($videoContainer);
if (params.endGame.skipButtonText) {
$('<a class="button skip">' + params.endGame.skipButtonText + '</a>').click(function () {
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video.stop();
$videoContainer.hide();
displayResults();
}).appendTo($videoContainer);
}
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return;
}
}
// Trigger finished event.
displayResults();
};
// Function for attaching the multichoice to a DOM element.
var attach = function (target) {
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if (typeof(target) === "string") {
$myDom = $('#' + target);
}
else {
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$myDom = $(target);
}
// Render own DOM into target.
$myDom.html(template.render(params));
if (params.backgroundImage !== undefined) {
$myDom.css({
overflow: 'hidden',
background: '#000 url(' + cp + params.backgroundImage.path + ') no-repeat 50% 50%',
backgroundSize: '100% auto'
});
}
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// Attach questions
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for (var i = 0; i < questionInstances.length; i++) {
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var question = questionInstances[i];
question.attach($('.question-container:eq(' + i + ')', $myDom));
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$(question).on('h5pQuestionAnswered', function () {
$('.progress-dot:eq(' + currentQuestion +')', $myDom).removeClass('unanswered').addClass('answered');
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_updateButtons();
});
if (question.getAnswerGiven()) {
$('.progress-dot:eq(' + i +')'
, $myDom).removeClass('unanswered').addClass('answered');
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}
}
// Allow other libraries to add transitions after the questions have been inited
$('.questionset', $myDom).addClass('started');
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$('.qs-startbutton', $myDom).click(function () {
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$(this).parents('.intro-page').hide();
$('.questionset', $myDom).removeClass('hidden');
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});
// Set event listeners.
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$('.progress-dot', $myDom).click(function () {
_showQuestion($(this).index());
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});
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$('.next.button', $myDom).click(function () {
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_showQuestion(currentQuestion + 1);
});
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$('.prev.button', $myDom).click(function () {
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_showQuestion(currentQuestion - 1);
});
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$('.finish.button', $myDom).click(function () {
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_displayEndGame();
});
// Hide all but initial Question.
_showQuestion(params.initialQuestion);
_updateButtons();
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if (renderSolutions) {
showSolutions();
}
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return this;
};
// Get current score for questionset.
var getScore = function () {
var score = 0;
for (var i = questionInstances.length - 1; i >= 0; i--) {
score += questionInstances[i].getScore();
}
return score;
};
// Get total score possible for questionset.
var totalScore = function () {
var score = 0;
for (var i = questionInstances.length - 1; i >= 0; i--) {
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score += questionInstances[i].getMaxScore();
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}
return score;
};
// Masquerade the main object to hide inner properties and functions.
var returnObject = {
attach: attach, // Attach to DOM object
getQuestions: function () {return questionInstances;},
getScore: getScore,
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showSolutions: function () {
renderSolutions = true;
},
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totalScore: totalScore,
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reRender: reRender,
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defaults: defaults // Provide defaults for inspection
};
return returnObject;
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};