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script.js
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(function () {
"use strict";
let minute = "0",
secound = "00",
secondr = secound.split("")[1],
secondl = secound.split("")[0],
timer,
Time = document.querySelector(".time"),
myNumber = document.querySelector(".number"),
Question = document.querySelector(".question"),
Index = 0,
Answers = document.querySelector(".answers"),
Start = document.querySelector(".start"),
Previous = document.querySelector(".previous"),
Next = document.querySelector(".next"),
Finish = document.querySelector(".finish"),
arr = [],
correct = 0;
const questions = [
"Inside which HTML element do we put the JavaScript?",
`What is the correct JavaScript syntax to change the content of the HTML element below?
<p id="demo">This is a demonstration.</p>
`,
"Where is the correct place to insert a JavaScript?",
`What is the correct syntax for referring to an external script called "xxx.js"?`,
'The external JavaScript file must contain the <script> tag.',
'How do you write "Hello World" in an alert box?',
'How do you create a function in JavaScript?',
'How do you call a function named "myFunction"?',
'How to write an IF statement in JavaScript?',
`How to write an IF statement for executing some code if "i" is NOT equal to 5?`,
'How does a WHILE loop start?',
'How does a FOR loop start?',
'How can you add a comment in a JavaScript?',
'How to insert a comment that has more than one line?',
'What is the correct way to write a JavaScript array?',
'How do you round the number 7.25, to the nearest integer?',
'How do you find the number with the highest value of x and y?',
'What is the correct JavaScript syntax for opening a new window called "w2" ?',
'JavaScript is the same as Java.',
`How can you detect the client's browser name?`,
'Which event occurs when the user clicks on an HTML element?',
'How do you declare a JavaScript variable?',
'Which operator is used to assign a value to a variable?',
'What will the following code return: Boolean(10 > 9)',
'Is JavaScript case-sensitive?'
],
answers = [
[
"<script>",
"<js>",
"<scripting>",
"<javascript>"
],
[
'document.getElement("p").innerHTML = "Hello World!";',
'document.getElementById("demo").innerHTML = "Hello World!";',
'document.getElementByName("p").innerHTML = "Hello World!";',
'#demo.innerHTML = "Hello World!";'
],
[
"Both the <head> section and the <body> section are correct",
"The <head> section",
"The <body> section"
],
[
`<script href="xxx.js">`,
`<script src="xxx.js">`,
`<script name="xxx.js">`
],
[
"True",
"False"
],
[
`msg("Hello World");`,
`alert("Hello World");`,
`alertBox("Hello World");`,
`msgBox("Hello World");`
],
[
"function myFunction()",
"function:myFunction()",
"function = myFunction()"
],
[
"call function myFunction()",
"myFunction()",
"call myFunction()"
],
[
"if i == 5 then",
"if i = 5",
"if i = 5 then",
"if (i == 5)"
],
[
"if (i != 5)",
"if i <> 5",
"if (i <> 5)",
"if i =! 5 then"
],
[
"while i = 1 to 10",
"while (i <= 10)",
"while (i <= 10; i++)"
],
[
"for (i <= 5; i++)",
"for (i = 0; i <= 5; i++)",
"for (i = 0; i <= 5)",
"for i = 1 to 5"
],
[
`<!--This is a comment-->`,
`'This is a comment`,
"//This is a comment"
],
[
`/*This comment has
more than one line*/`,
`//This comment has
more than one line//`,
`<!--This comment has
more than one line-->`
],
[
`var colors = 1 = ("red"), 2 = ("green"), 3 = ("blue")`,
`var colors = (1:"red", 2:"green", 3:"blue")`,
`var colors = "red", "green", "blue"`,
`var colors = ["red", "green", "blue"]`
],
[
"round(7.25)",
"Math.round(7.25)",
"Math.rnd(7.25)",
"rnd(7.25)"
],
[
"top(x, y)",
"Math.ceil(x, y)",
"Math.max(x, y)",
"ceil(x, y)"
],
[
`w2 = window.open("http://www.w3schools.com");`,
`w2 = window.new("http://www.w3schools.com");`
],
[
"True",
"False"
],
[
"client.navName",
"browser.name",
"navigator.appName"
],
[
"onmouseover",
"onchange",
"onmouseclick",
"onclick"
],
[
"var carName;",
"variable carName;",
"v carName;"
],
[
"=",
"*",
"x",
"-"
],
[
"NaN",
"false",
"true"
],
[
"Yes",
"No"
],
],
correctAnswers = [
`<script>`,
`document.getElementById("demo").innerHTML = "Hello World!";`,
`Both the <head> section and the <body> section are correct`,
`<script src="xxx.js">`,
`False`,
`alert("Hello World");`,
`function myFunction()`,
`myFunction()`,
`if (i == 5)`,
`if (i != 5)`,
`while (i <= 10)`,
`for (i = 0; i <= 5; i++)`,
`//This is a comment`,
`/*This comment has
more than one line*/`,
`var colors = ["red", "green", "blue"]`,
`Math.round(7.25)`,
`Math.max(x, y)`,
`w2 = window.open("http://www.w3schools.com");`,
`False`,
`navigator.appName`,
`onclick`,
`var carName;`,
`=`,
`true`,
`Yes`
]
Question.innerText = questions[Index];
Answers.innerHTML = `
<div class="answer p-sm-3 py-2 d-flex align-items-center">
<span class="check_1 d-flex align-items-center justify-content-center rounded-circle bg-warning mr-2 mt-n2">
<span class="check_2 rounded-circle bg-white"></span>
</span>
<h6></h6>
</div>
<div class="answer p-sm-3 py-2 d-flex align-items-center">
<span class="check_1 d-flex align-items-center justify-content-center rounded-circle bg-warning mr-2">
<span class="check_2 rounded-circle bg-white"></span>
</span>
<h6></h6>
</div>
<div class="answer p-sm-3 py-2 d-flex align-items-center">
<span class="check_1 d-flex align-items-center justify-content-center rounded-circle bg-warning mr-2">
<span class="check_2 rounded-circle bg-white"></span>
</span>
<h6></h6>
</div>
<div class="answer p-sm-3 py-2 d-flex align-items-center">
<span class="check_1 d-flex align-items-center justify-content-center rounded-circle bg-warning mr-2">
<span class="check_2 rounded-circle bg-white"></span>
</span>
<h6></h6>
</div>
`
let AnswersOne = document.querySelectorAll(".answer")[0].querySelector('h6'),
AnswersTwo = document.querySelectorAll(".answer")[1].querySelector('h6'),
AnswersThree = document.querySelectorAll(".answer")[2].querySelector('h6'),
AnswerFour = document.querySelectorAll(".answer")[3].querySelector('h6'),
Answer = document.querySelectorAll(".answer");
AnswersOne.innerText = `${answers[Index][0]}`;
AnswersTwo.innerText = `${answers[Index][1]}`;
AnswersThree.innerText = `${answers[Index][2]}`;
AnswerFour.innerText = `${answers[Index][3]}`;
myNumber.closest('.questionNumber').style.opacity = '0';
Question.style.opacity = '0';
Answers.style.display = 'none';
Answer.forEach(el1 =>{
el1.addEventListener('click' ,()=>{
Answer.forEach(el2 =>{
if(el2.classList.contains('checked')) {
el2.classList.remove('checked');
}
})
el1.classList.add('checked');
})
})
Start.addEventListener('click',()=>{
myNumber.closest('.questionNumber').style.opacity = '1';
Question.style.opacity = '1';
Answers.style.display = 'block';
btnDisable(Start);
btnInable(Next);
btnInable(Finish);
timer = setInterval(() => {
++secondr;
++secound;
let time = `${minute} : ${secondl}${secondr}`;
if (secondr == 9) {
secondr = -1;
++secondl;
}
if (secound == 59) {
secondr = -1;
secondl = 0;
++minute;
}
Time.innerText = time;
}, 1000);
},{once : true})
Next.addEventListener("mousedown", () => {
Answer.forEach(el =>{
if(el.classList.contains('checked')) {
arr[myNumber.innerText-1] = el.querySelector('h6').innerText;
}
})
});
Previous.addEventListener("mousedown", () => {
Answer.forEach(el =>{
if(el.classList.contains('checked')) {
arr[myNumber.innerText-1] = el.querySelector('h6').innerText;
}
})
});
Next.addEventListener("click", () => {
if(!Next.classList.contains('disabled')) {
Answer.forEach(el =>{
el.classList.remove('checked');
})
setTimeout(() => {
Answer.forEach(el =>{
if(arr[myNumber.innerText-1] == el.querySelector('h6').innerText) {
el.classList.add('checked');
}
})
}, 10);
++myNumber.innerText;
++Index;
btnInable(Previous);
if (myNumber.innerText <= 25) {
if(`${answers[Index][2]}` == 'undefined') {
AnswersThree.closest('.answer').classList.replace('d-flex','d-none');
}else {
AnswersThree.closest('.answer').classList.replace('d-none','d-flex');
}
if(`${answers[Index][3]}` == 'undefined') {
AnswerFour.closest('.answer').classList.replace('d-flex','d-none')
}else {
AnswerFour.closest('.answer').classList.replace('d-none','d-flex');
}
Question.innerText = questions[Index];
AnswersOne.innerText = `${answers[Index][0]}`;
AnswersTwo.innerText = `${answers[Index][1]}`;
AnswersThree.innerText = `${answers[Index][2]}`;
AnswerFour.innerText = `${answers[Index][3]}`;
}
if (myNumber.innerText == 25) {
btnDisable(Next);
}
}
});
Previous.addEventListener("click", () => {
if (myNumber.innerText > 1 && !Previous.classList.contains('disabled')) {
Answer.forEach(el =>{
el.classList.remove('checked');
})
setTimeout(() => {
Answer.forEach(el =>{
if(arr[myNumber.innerText-1] == el.querySelector('h6').innerText) {
el.classList.add('checked');
}
})
}, 10);
--myNumber.innerText;
--Index;
btnInable(Next);
if(`${answers[Index][2]}` == 'undefined') {
AnswersThree.closest('.answer').classList.replace('d-flex','d-none');
}else {
AnswersThree.closest('.answer').classList.replace('d-none','d-flex');
}
if(`${answers[Index][3]}` == 'undefined') {
AnswerFour.closest('.answer').classList.replace('d-flex','d-none')
}else {
AnswerFour.closest('.answer').classList.replace('d-none','d-flex');
}
Question.innerText = questions[Index];
AnswersOne.innerText = `${answers[Index][0]}`;
AnswersTwo.innerText = `${answers[Index][1]}`;
AnswersThree.innerText = `${answers[Index][2]}`;
AnswerFour.innerText = `${answers[Index][3]}`;
}
if(myNumber.innerText == '1') {
btnDisable(Previous);
}
});
Finish.addEventListener("mousedown", () => {
Answer.forEach(el =>{
if(el.classList.contains('checked')) {
arr[myNumber.innerText-1] = el.querySelector('h6').innerText;
}
})
});
Finish.addEventListener('click' ,()=>{
if(!Finish.classList.contains('disabled')){
btnDisable(Next);
btnDisable(Previous);
btnDisable(Finish);
clearInterval(timer);
Question.innerText = "";
myNumber.closest('.questionNumber').innerText = "";
let
a = 0,
len = correctAnswers.length,
text = '';
for (; a < len ; a++) {
if(correctAnswers[a] == arr[a]){
++correct;
}
}
if(correct >= 15) {
text = 'You can be proud of yourself!'
}else {
text = 'You must study much harder!'
}
Answers.innerHTML = `
<h5 class="message text-center">${text}</h5>
<div class="d-flex justify-content-around my-5">
<div class="time-spent font-weight-bolder">Time Spent: <span>${Time.innerText}</span></div>
<div class="percent font-weight-bolder">${(correct * 100) / questions.length}%</div>
<div class="result font-weight-bolder">Result: <span>${correct}</span> of ${questions.length}</div>
</div>
<hr>
<div class="wrapper mt-5 text-center">
<button class="show-result btn btn-success p-3">
Check your answers
<span></span>
<span></span>
<span></span>
<span></span>
</button>
</div>
`
let Message = document.querySelector('.message'),
Result = document.querySelector('.result').querySelector('span'),
timeSpent = document.querySelector('.time-spent').querySelector('span'),
Percent = document.querySelector('.percent'),
showResult = document.querySelector('.show-result');
if(correct >= 15) {
Message.classList.add('text-success');
Result.classList.add('text-success');
}else {
Message.classList.add('text-danger');
Result.classList.add('text-danger');
}
if(minute <= '10') {
timeSpent.classList.add('text-success');
}else {
timeSpent.classList.add('text-danger');
}
if((correct * 100) / questions.length >= '50') {
Percent.classList.add('text-success');
}else {
Percent.classList.add('text-danger');
}
showResult.addEventListener('click' , ()=>{
showResult.style.display = 'none';
let
q = 0,
len = correctAnswers.length;
for (; q < len ; q++) {
Answers.innerHTML += `
<h5 class="check-question mt-5"><span></span><span></span></h5>
<div class="check-answer p-3 mt-3">
<h6></h6>
</div>
<div class="check-answer p-3">
<h6></h6>
</div>
<div class="check-answer p-3">
<h6></h6>
</div>
<div class="check-answer p-3">
<h6></h6>
</div>
`
let checkQuestion = document.querySelectorAll('.check-question'),
checkAnswer = document.querySelectorAll('.check-answer');
checkQuestion[checkQuestion.length-1].querySelectorAll('span')[0].innerText = `${q + 1}. `
checkQuestion[checkQuestion.length-1].querySelectorAll('span')[1].innerText = `${questions[q]}`
checkAnswer[checkAnswer.length-4].querySelector('h6').innerText = `${answers[q][0]}`;
checkAnswer[checkAnswer.length-3].querySelector('h6').innerText = `${answers[q][1]}`;
if(`${answers[q][2]}` == 'undefined') {
checkAnswer[checkAnswer.length-2].style.display = 'none'
} else {
checkAnswer[checkAnswer.length-2].querySelector('h6').innerText = `${answers[q][2]}`;
}
if(`${answers[q][3]}` == 'undefined') {
checkAnswer[checkAnswer.length-1].style.display = 'none'
} else {
checkAnswer[checkAnswer.length-1].querySelector('h6').innerText = `${answers[q][3]}`;
}
checkAnswer.forEach(el =>{
if(correctAnswers[q] == el.innerText) {
el.classList.add('text-info');
}
if(el.innerText == arr[q] && arr[q] == correctAnswers[q]) {
el.classList.replace('text-info' , 'text-success')
}
if(el.innerText == arr[q] && arr[q] != correctAnswers[q]) {
el.classList.add('text-danger');
}
})
}
})
}
})
function btnDisable(btn) {
btn.classList.replace('btn-success' , 'btn-warning');
btn.classList.add('disabled');
}
function btnInable(btn) {
btn.classList.replace('btn-warning' , 'btn-success');
btn.classList.remove('disabled');
}
})();