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quizz.js
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quizz.js
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const quizData = {
title: 'Easy quiz',
questions: [
{
question: "What is the correct way to declare a variable in JS",
a: "let x = 10;",
b: "new variable = 'text'",
c: "const turns;",
d: "var 8pool = 8",
correct: "a",
},
{
question: "What does HTML stand for?",
a: "Cascading Style Sheet",
b: "Jason Object Notation",
c: "HyperText Markup Language",
d: "Helicopters Terminals Motorbikes Laces",
correct: "c",
},
{
question: "What year was JS launched?",
a: "1990",
b: "1995",
c: "1996",
d: "1997",
correct: "b",
}
],
score: 0
}
/* quizzes */
const quizzes = document.getElementsByClassName('quizzes');
/* quizz container */
const title = document.getElementById("quiz-title");
const questionEl = document.getElementById("question");
const answerElements = document.querySelectorAll(".answer");
const a_text = document.getElementById("a_text");
const b_text = document.getElementById("b_text");
const c_text = document.getElementById("c_text");
const d_text = document.getElementById("d_text");
const submitBtn = document.getElementById("submit")
const quizContainer = document.getElementById("quiz");
const quizContent = document.getElementById('quiz-content')
const quizAlternative = document.getElementById('quiz-content-alternative')
const date = document.getElementById("date")
/* modal */
const modal = document.getElementById('modal')
const close_btn = document.getElementById('close')
function showModal() {
modal.style.display = "flex"
quizContent.style.display = 'block'
quizAlternative.style.display = 'none'
}
function hideModal() {
modal.style.display = "none"
// update quiz info whenever quitting from a quiz
fillQuizzOverview(0, quizData)
}
// close modal
modal.addEventListener('click', hideModal)
close_btn.addEventListener('click', hideModal)
// stop modal from closing while clicking on the quiz
quizContainer.addEventListener('click', e => e.stopPropagation())
function deselectAnswer() {
for (let i = 0; i < answerElements.length; i++) {
answerElements[i].checked = false
}
}
function getSelectedAnswer() {
for (let i = 0; i < answerElements.length; i++) {
if (answerElements[i].checked)
return answerElements[i].id
}
}
function fillModal(quiz, questionId) {
title.innerText = quiz.title
questionEl.innerText = quiz.questions[questionId].question;
a_text.innerText = quiz.questions[questionId].a;
b_text.innerText = quiz.questions[questionId].b;
c_text.innerText = quiz.questions[questionId].c;
d_text.innerText = quiz.questions[questionId].d;
let getDate = new Date(Date.now()).toLocaleString().split(',')[0];
date.innerHTML = getDate
function checkAnswer(callback) {
return function () {
const answer = getSelectedAnswer()
if (answer) {
if (answer === quiz.questions[questionId].correct) {
quiz.score++;
}
callback()
} else {
alert('you have to select an answer!')
}
}
}
if (questionId + 1 === quiz.questions.length) {
submitBtn.innerText = "submit"
submitBtn.onclick = checkAnswer(e => {
quizContent.style.display = 'none'
quizAlternative.style.display = 'block'
quizAlternative.innerHTML = `<h2>Quiz Finished. You have ${quiz.score} out of ${quiz.questions.length} correct answers.</h2>`
submitBtn.innerText = 'Exit quiz'
submitBtn.onclick = () => {
hideModal()
}
})
} else {
submitBtn.innerText = "Next question"
submitBtn.onclick = checkAnswer(e => {
fillModal(quiz, questionId + 1)
})
}
deselectAnswer()
}
function fillQuizzOverview(quizId, quiz) {
const container = quizzes.item(quizId)
const title = container.querySelector('#title')
const nb_questions = container.querySelector('#nb_questions')
const quiz_score = container.querySelector('#quiz_score')
const open_quiz = container.querySelector('#open_quiz')
title.innerHTML = quiz.title;
nb_questions.innerHTML = quiz.questions.length;
quiz_score.innerHTML = quiz.score;
open_quiz.addEventListener('mouseup', (e) => {
fillModal(quiz, 0)
quiz.score = 0
showModal()
});
}
fillQuizzOverview(0, quizData)