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quiz2.js
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quiz2.js
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// global variables
let allQs = [];
let currQ = 0, currentQuiz = "";
let questions, quizQuestions = 0;
let userAnswer;
const card = document.getElementById('card');
const welcome = document.getElementById('welcome');
const radios = document.getElementById('radios');
const catBtns = document.getElementById('subjects');
const navBtns = document.getElementById('nav-buttons');
// show the categories as buttons
function showCats(){
// clear out the button area
radios.innerHTML = "";
catBtns.innerHTML = "";
navBtns.innerHTML = "";
// splits out all the categories
var categories = allQs.map( (el) => {
return el.category;
});
// returns only the unique categories
var uniques = Array.from(new Set(categories));
// capitalize the first letter of each category
for (var i = 0; i < uniques.length; i++){
uniques[i] = uniques[i].charAt(0).toUpperCase() + uniques[i].substr(1);
}
// create buttons for the different categories
for (var i = 0; i < uniques.length; i++) {
var btn = document.createElement('button');
btn.setAttribute('class', 'cat');
btn.setAttribute('id', uniques[i]);
var label = document.createTextNode(uniques[i]);
btn.appendChild(label);
catBtns.appendChild(btn);
// activate the category buttons
btn.addEventListener('click', (e) => {
// go to the last Q of the picked quiz
currentQuiz = e.target.id;
currQ = 0;
loadQs(currentQuiz);
});
}
}
function loadNav(){
navBtns.innerHTML = `
<button class='nav' id='prev'><i class='fa fa-arrow-left fa-2x'></i></button>
<button class='nav' id='next'><i class='fa fa-arrow-right fa-2x'></i></button>
<button class='nav' id='home'><i class='fa fa-home fa-2x'></i></button>
`;
const prev = document.getElementById('prev');
const next = document.getElementById('next');
const home = document.getElementById('home');
prev.addEventListener('click', () => {
currQ > 0 ? currQ -= 1 : currQ = 0;
loadQs(currentQuiz);
});
next.addEventListener('click', () => {
currQ < quizQuestions - 1 ? currQ += 1 : currQ = currQ;
loadQs(currentQuiz);
});
home.addEventListener('click', () => {
start();
});
}
function loadQs(currentQuiz){
card.style.height = 500 + 'px';
radios.style.height = 250 + 'px';
// 'questions' contains all of relevant quiz info
questions = allQs.filter( (el) => {
if (el.category === currentQuiz.toLowerCase())
return el;
});
// how many questions in the current Quiz?
quizQuestions = questions.length;
// load the current question
loadCurrentQ();
// load the answer radio buttons
loadRadios(questions[currQ].choices);
// clear the category buttons
catBtns.innerHTML = "";
// add the navigation buttons
loadNav();
}
function loadCurrentQ(){
welcome.innerHTML = `<p>${currentQuiz} QUIZ</p>
<p>${currQ + 1}) ${questions[currQ].question}</p>`;
}
function loadRadios(choices){
//console.log(choices);
// add the radio buttons
radios.innerHTML = "";
var str = "";
for (var i = 0; i < choices.length; i++){
// if question has already been answered correctly
if (questions[currQ].correct == true){
// only display the correct answer
// delete all incorrect answer choices
str += '<label class="black"><input type="radio" class="radio" disabled="true" checked="true">'
+ choices[questions[currQ].correctAnswer] + '</label>';
break;
}
else if (questions[currQ].guessed.indexOf(i) > -1) {
// radio button of wrong ones should be disabled
str += '<label class="grey"><input type="radio" class="radio" disabled="true">'
+ choices[i].strike() + '</label>';
} else {
str += '<label class="black"><input type="radio" class="radio" name="answers" id="' + i + '" value="' +
choices[i] + '">' + choices[i] + '</label>';
}
}
radios.innerHTML = str;
// add the submit button
var submitDiv = document.createElement('div');
submitDiv.setAttribute('id', 'submitDiv');
var submitEl = document.getElementById('submitDiv');
var submit = document.createElement('button');
submit.setAttribute('class', 'submit');
submit.setAttribute('id', 'submitId');
var label = document.createTextNode('Submit');
submit.appendChild(label);
submitDiv.appendChild(submit);
radios.appendChild(submitDiv);
// detemine which radio button was checked
radios.addEventListener('click', (e) => {
userAnswer = e.target.id;
});
// if q not correct, activate the submit button
const submitBtn = document.getElementById('submitId');
if (questions[currQ].correct == true){
submitBtn.style.backgroundColor = '#ccc';
submitBtn.style.borderColor = '#ccc';
submitBtn.disabled = true;
submitBtn.style.color = '#555';
} else
submitBtn.addEventListener('click', checkIfCorrect);
}
function checkIfCorrect(){
// update last question answered
console.log('currentQ: ' + currQ);
questions[currQ].lastQ = currQ;
// compare checked to correct answer
if (userAnswer == questions[currQ].correctAnswer){
// IF CORRECT ////////////////////////////
questions[currQ].correct = true;
questions[currQ].guessed = [];
showCorrect();
// test if at the last question
currQ < quizQuestions - 1 ? currQ += 1 : currQ = currQ;
} else {
// IF WRONG //////////////////////////////
questions[currQ].guessed.push(parseInt(userAnswer));
showWrong();
// if too many wrong, go to next question
if (questions[currQ].guessed.length > 2 && currQ < quizQuestions) {
currQ++;
}
}
setTimeout(loadQs(currentQuiz), 1000);
}
function showCorrect(){
document.getElementById('applause').play();
let feedback = document.createElement('SPAN');
feedback.setAttribute("id", "feedback");
feedback.innerHTML = "<i class='fa fa-check-square fa-5x'></i>";
document.body.appendChild(feedback);
feedback.style.transform = 'rotate(-90deg)';
feedback.className = 'show';
setTimeout(()=>{ feedback.className = 'hide'; }, 1000);
setTimeout(()=>{ feedback.outerHTML = ''; }, 1500);
}
function showWrong(){
let str = "";
document.getElementById('buzzer').play();
let feedback = document.createElement('SPAN');
feedback.setAttribute("id", "feedback");
for (var i = 0; i < questions[currQ].guessed.length; i++){
str += '<i class="fa fa-window-close fa-4x"></i>';
}
feedback.innerHTML = str;
document.body.appendChild(feedback);
feedback.className = 'show';
setTimeout(()=>{ feedback.className = 'hide'; }, 1000);
setTimeout(()=>{ feedback.outerHTML = ''; }, 1500);
}
function start(){
card.style.height = 360 + 'px';
radios.style.height = 10 + 'px';
card.style.top = 30 + 'px';
card.style.opacity = 1.0;
welcome.innerHTML = `<p>Welcome to<br>the Quiz Game!</p>
<p>Please select a quiz category:</p>`;
if (allQs.length > 0)
showCats();
else
getData();
}
function addProps(){
for (var i = 0; i < allQs.length; i++){
allQs[i].guessed = [];
allQs[i].correct = false;
allQs[i].lastQ = 0;
}
}
// fetch the data
function getData(){
const url = 'http://www.richardkeightley.com/Quizgame/questions.JSON';
fetch(url)
.then (function(response){
return response.json();
})
.then(function(theData){
allQs = theData;
addProps();
showCats();
})
.catch(function(err){
console.log('failure: ' + err);
});
/*
let header = new Headers({
'Access-Control-Allow-Origin': '*',
'Content-Type': 'text/plain'
});
var req = new Request(url, {
method: 'GET',
headers: header,
mode: 'cors',
redirect: 'follow',
cache: 'default'
});
fetch(req)
.then ( response => response.json() )
.then ( text => {
allQs = text;
showCats();
})
.catch( err => {
console.log('failure: ' + err)
});
*/
}
start();