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Em01
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Basic quiz app
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‎objectOriented/quiz/.DS_Store‎

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‎objectOriented/quiz/Quiz/app.js‎

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//Create Questions
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var questions = [
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new Question("Who was the first President of the United States?", [ "George Washington", "Thomas Jefferson" ], "George Washington"),
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new Question("What is the answer to the Ultimate Question of Life, the Universe, and Everything?", ["Pi","42"], "42")
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];
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//Create Quiz
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var quiz = new Quiz(questions);
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//Display Quiz
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QuizUI.displayNext();

‎objectOriented/quiz/Quiz/index.html‎

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<!DOCTYPE html>
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<html>
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<head lang="en">
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<meta charset="UTF-8">
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<title>Amazing Quiz</title>
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<link rel="stylesheet" type="text/css" href="style.css">
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</head>
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<body>
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<div class="grid">
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<div id="quiz" class="centered grid__col--8">
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<h1>Awesome Quiz</h1>
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<h2 id="question" class="headline-secondary--grouped"></h2>
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<h3 id="score"></h3>
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<p id="choice0"></p>
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<button id="guess0" class="btn--default">Select Answer</button>
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<p id="choice1"></p>
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<button id="guess1" class="btn--default">Select Answer</button>
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<footer>
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<p id="progress">Question x of y</p>
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</footer>
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</div>
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</div>
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<script src="quiz.js"></script>
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<script src="question.js"></script>
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<script src="quiz_ui.js"></script>
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<script src="app.js"></script>
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</body>
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</html>

‎objectOriented/quiz/Quiz/question.js‎

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function Question(title, choices, answer){
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Choices.call(this, title, answer);
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this.title = title;
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this.answer = answer;
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}
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Question.prototype.isCorrectAnswer = function(choice) {
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return this.answer === choice;
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};

‎objectOriented/quiz/Quiz/quiz.js‎

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function Quiz(questions) {
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this.score = 0;
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this.questions = questions;
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this.currentQuestionIndex = 0;
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}
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Quiz.prototype.guess = function(answer) {
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if(this.getCurrentQuestion().isCorrectAnswer(answer)) {
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this.score++;
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}
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this.currentQuestionIndex++;
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};
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Quiz.prototype.getCurrentQuestion = function() {
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return this.questions[this.currentQuestionIndex];
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};
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Quiz.prototype.hasEnded = function() {
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return this.currentQuestionIndex >= this.questions.length;
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};
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‎objectOriented/quiz/Quiz/quiz_ui.js‎

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var QuizUI = {
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displayNext: function () {
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if (quiz.hasEnded()) {
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this.displayScore();
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} else {
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this.displayQuestion();
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this.displayChoices();
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this.displayProgress();
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}
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},
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displayQuestion: function() {
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this.populateIdWithHTML("question", quiz.getCurrentQuestion().text);
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},
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displayChoices: function() {
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var choices = quiz.getCurrentQuestion().choices;
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for(var i = 0; i < choices.length; i++) {
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this.populateIdWithHTML("choice" + i, choices[i]);
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this.guessHandler("guess" + i, choices[i]);
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}
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},
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displayScore: function() {
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var gameOverHTML = "<h1>Game Over</h1>";
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gameOverHTML += "<h2> Your score is: " + quiz.score + "</h2>";
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this.populateIdWithHTML("quiz", gameOverHTML);
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},
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populateIdWithHTML: function(id, text) {
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var element = document.getElementById(id);
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element.innerHTML = text;
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},
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guessHandler: function(id, guess) {
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var button = document.getElementById(id);
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button.onclick = function() {
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quiz.guess(guess);
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QuizUI.displayNext();
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}
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},
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displayProgress: function() {
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var currentQuestionNumber = quiz.currentQuestionIndex + 1;
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this.populateIdWithHTML("progress", "Question " + currentQuestionNumber + " of " + quiz.questions.length);
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}
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};

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