Create a Quiz App Using JavaScript (Source Code)

HTML Code For Quiz App:-

<div class="quiz-container" id="quiz">
<div class="quiz-header">
<h2 id="question">Question is loading...</h2>
<ul>
<li>
<input type="radio" name="answer" id="a" class="answer" />
<label for="a" id="a_text">Answer...</label>
</li>
<li>
<input type="radio" name="answer" id="b" class="answer" />
<label for="b" id="b_text">Answer...</label>
</li>
<li>
<input type="radio" name="answer" id="c" class="answer" />
<label for="c" id="c_text">Answer...</label>
</li>
<li>
<input type="radio" name="answer" id="d" class="answer" />
<label for="d" id="d_text">Answer...</label>
</li>
</ul>
</div>
<button id="submit">Submit</button>
</div>

We will create a container div tag which will be the main container for our quiz app.

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• Using a div tag with the class “quiz-header” we will now build the framework for our quiz container.
• We’ll design the main heading for our quiz app using the <h2> tag.
• Now with the help of an unordered list, we will be creating the list of options in the quiz app.
• Inside the unordered list, we will create a different input tag with the type “radio” to select one correct option in the quiz.
• Then, using the button tag, we will create a submit button for submitting the last answer.

We have added the basic structure for our Quiz app. Let’s take look at our output.

Output: 

There Is All Html Code For Quiz App. Now You Can See Output Without Css And Javascript. Then We Use Css To Style Our Quiz App And Give Functionality Using Javascript In  Quiz App.

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CSS Code For Quiz App:-

Cascading Style Sheets (CSS) is a markup language for describing the presentation of a document written in HTML or XML. CSS, like HTML and JavaScript, is a key component of the World Wide Web.

Now we will look at our CSS code.

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;400&display=swap");
* {
box-sizing: border-box;
}
body {
background-color: #b8c6db;
background-image: linear-gradient(315deg, #b8c6db 0%, #f5f7fa 100%);
font-family: "Poppins", sans-serif;
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
margin: 0;
}
.quiz-container {
background-color: #fff;
border-radius: 10px;
box-shadow: 0 0 10px 2px rgba(100, 100, 100, 0.1);
width: 600px;
max-width: 95vw;
overflow: hidden;
}
.quiz-header {
padding: 4rem;
}
h2 {
padding: 1rem;
text-align: center;
margin: 0;
}
ul {
list-style-type: none;
padding: 0;
}
ul li {
font-size: 1.2rem;
margin: 1rem 0;
}
ul li label {
cursor: pointer;
}
button {
background-color: #8e44ad;
color: #fff;
border: none;
display: block;
width: 100%;
cursor: pointer;
font-size: 1.1rem;
font-family: inherit;
padding: 1.3rem;
}
button:hover {
background-color: #732d91;
}
button:focus {
outline: none;
background-color: #5e3370;
}

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;400&display=swap");
* {
    box-sizing: border-box;
}

body {
    background-color: #b8c6db;
    background-image: linear-gradient(315deg, #b8c6db 0%, #f5f7fa 100%);
    font-family: "Poppins", sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

.quiz-container {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px 2px rgba(100, 100, 100, 0.1);
    width: 600px;
    max-width: 95vw;
    overflow: hidden;
}

.quiz-header {
    padding: 4rem;
}

h2 {
    padding: 1rem;
    text-align: center;
    margin: 0;
}

ul {
    list-style-type: none;
    padding: 0;
}

ul li {
    font-size: 1.2rem;
    margin: 1rem 0;
}

ul li label {
    cursor: pointer;
}

button {
    background-color: #8e44ad;
    color: #fff;
    border: none;
    display: block;
    width: 100%;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: inherit;
    padding: 1.3rem;
}

button:hover {
    background-color: #732d91;
}

button:focus {
    outline: none;
    background-color: #5e3370;
}

JavaScript Quiz App Code:-

 const quizData = [
{
question: "Which language runs in a web browser?",
a: "Java",
b: "C",
c: "Python",
d: "JavaScript",
correct: "d",
},
{
question: "What does CSS stand for?",
a: "Central Style Sheets",
b: "Cascading Style Sheets",
c: "Cascading Simple Sheets",
d: "Cars SUVs Sailboats",
correct: "b",
},
{
question: "What does HTML stand for?",
a: "Hypertext Markup Language",
b: "Hypertext Markdown Language",
c: "Hyperloop Machine Language",
d: "Helicopters Terminals Motorboats Lamborginis",
correct: "a",
},
{
question: "What year was JavaScript launched?",
a: "1996",
b: "1995",
c: "1994",
d: "none of the above",
correct: "b",
},
];
const quiz = document.getElementById("quiz");
const answerElements = document.querySelectorAll(".answer");
const questionElement = document.getElementById("question");
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 submitButton = document.getElementById("submit");
let currentQuiz = 0;
let score = 0;
const deselectAnswers = () => {
answerElements.forEach((answer) => (answer.checked = false));
};
const getSelected = () => {
let answer;
answerElements.forEach((answerElement) => {
if (answerElement.checked) answer = answerElement.id;
});
return answer;
};
const loadQuiz = () => {
deselectAnswers();
const currentQuizData = quizData[currentQuiz];
questionElement.innerText = currentQuizData.question;
a_text.innerText = currentQuizData.a;
b_text.innerText = currentQuizData.b;
c_text.innerText = currentQuizData.c;
d_text.innerText = currentQuizData.d;
};
loadQuiz();
submitButton.addEventListener("click", () => {
const answer = getSelected();
if (answer) {
if (answer === quizData[currentQuiz].correct) score++;
currentQuiz++;
if (currentQuiz < quizData.length) loadQuiz();
else {
quiz.innerHTML = `
<h2>You answered ${score}/${quizData.length} questions correctly</h2>
<button onclick="history.go(0)">Play Again</button>
` // location.reload() won't work in CodePen for security reasons;
}
}
});

Step1:In order to store the various quiz questions inside our quiz app, we will first build an array variable named “quiz data,” after which we will construct some constant variables and use the document. The getelementById () method will be used to select every html element in our quiz app.

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const quizData = [{
    question: "Which language runs in a web browser?",
    a: "Java",
    b: "C",
    c: "Python",
    d: "JavaScript",
    correct: "d",
}, {
    question: "What does CSS stand for?",
    a: "Central Style Sheets",
    b: "Cascading Style Sheets",
    c: "Cascading Simple Sheets",
    d: "Cars SUVs Sailboats",
    correct: "b",
}, {
    question: "What does HTML stand for?",
    a: "Hypertext Markup Language",
    b: "Hypertext Markdown Language",
    c: "Hyperloop Machine Language",
    d: "Helicopters Terminals Motorboats Lamborginis",
    correct: "a",
}, {
    question: "What year was JavaScript launched?",
    a: "1996",
    b: "1995",
    c: "1994",
    d: "none of the above",
    correct: "b",
}, ];
const quiz = document.getElementById("quiz");
const answerElements = document.querySelectorAll(".answer");
const questionElement = document.getElementById("question");
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 submitButton = document.getElementById("submit");

Step2:We’ll now create two variables, “current quiz” and “score,” with values set to “zero,” using the let keyword. Now that the getselected function has been created, we will check to see if the option we have selected matches the answer element using the if statement before returning the result.

The text of our html elements will also be changed, and at the end of the quiz button, our submit button will be changed to a restart button. In a similar manner, we will also create a loadquiz() function. Through this function, we will display the question inside our quiz app using the innerText property.

let currentQuiz = 0;
let score = 0;
const deselectAnswers = () => {
    answerElements.forEach((answer) => (answer.checked = false));
};
const getSelected = () => {
    let answer;
    answerElements.forEach((answerElement) => {
        if (answerElement.checked) answer = answerElement.id;
    });
    return answer;
};
const loadQuiz = () => {
    deselectAnswers();
    const currentQuizData = quizData[currentQuiz];
    questionElement.innerText = currentQuizData.question;
    a_text.innerText = currentQuizData.a;
    b_text.innerText = currentQuizData.b;
    c_text.innerText = currentQuizData.c;
    d_text.innerText = currentQuizData.d;
};
loadQuiz();
submitButton.addEventListener("click", () => {
    const answer = getSelected();
    if (answer) {
        if (answer === quizData[currentQuiz].correct) score++;
        currentQuiz++;
        if (currentQuiz < quizData.length) loadQuiz();
        else {
            quiz.innerHTML = ` <h2>You answered ${score}/${quizData.length} questions correctly</h2> 
                <button onclick="history.go(0)">Play Again</button> `
                // location.reload() won't work in CodePen for security reasons; } } });
        }
    }
});

Final Output Of Quiz App Using JavaScript:-

Video Output of Quiz App:

 Hope you like this Quiz App Using HTML, CSS and JavaScript. you can see the output video and project screenshots. See our other blogs and gain knowledge in front-end development.

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