Quiz App – CodingNepal

10 Easy JavaScript Games for Beginners with Source Code

CodingNepal — Fri, 24 Feb 2023 17:14:49 +0000

Are you looking for a fun and engaging way to learn JavaScript? Creating games is a great way to learn the language and gain experience with programming concepts such as logic, algorithms, and problem-solving skills.

In this blog post, I will share the 10 Easy to Build JavaScript Games for Beginners. Each game on this list is simple but challenging enough to help you learn new JavaScript concepts. So, whether you’re a beginner or an experienced developer, learning to code games with JavaScript is a rewarding experience.

To make your learning process easier, each game is built with HTML, CSS, and vanilla JavaScript which means no external libraries or frameworks are used. I’ve also provided the source code and a video tutorial for all the games on this list.

You can easily reference these resources for guidance if you encounter any problems. So, let’s not waste more time and dive right into the game list!

1. Memory Card Game

Memory Card is a beginner-friendly game that you can create using HTML, CSS, and JavaScript. In this game, 16 cards are placed randomly on the screen, and each pair of cards has the same image. The objective of the game is to find all the matching pairs by clicking on the cards.

There’s no time limit to finding the matching cards, so players can take their time and focus on improving their memory. Creating this game is a great way to practice different JavaScript concepts, including event listeners, loops, arrays, and others.

2. Typing Speed Test Game

You may have tested your typing speed on different typing speed test websites. In this game, users have 60 seconds to type as many characters as possible and can check their WPM, CPM, accuracy, and more. Users can even erase their incorrect characters or go back using the backspace key.

Creating this game is a good way to improve your problem-solving skills and gain a better understanding of JavaScript concepts such as manipulating the DOM, handling event listeners, and creating user-friendly designs.

3. Hangman Game with Illustration

Hangman is the classic word-guessing game you’ve likely enjoyed playing. In this game, players try to guess all the letters of a randomly generated word within a given number of tries. There is also a hangman illustration that will progressively appear on the gallows for each incorrect guess.

Building a Hangman game from scratch using HTML, CSS, and JavaScript is an enjoyable and rewarding experience that can strengthen your web development and problem-solving skills.

4. Quiz Game with Timer

Quiz is a very popular game that every beginner tries to create using JavaScript. In this game, the users will be asked multiple questions with options and must choose the correct one within 15 seconds. Ultimately, the user score will be shown based on correct answers only.

Creating a Quiz game can help you understand various JavaScript concepts, including manipulating the DOM, using setInterval, working with arrays of objects, writing functions, and using loops. Moreover, this game project can also provide you with valuable experience in HTML and CSS, which can help you in web development.

5. Word Scramble Game

Word scramble is an easy word game you can create as a beginner. In this game, players must unscramble a set of letters to form a word within a given time limit of 30 seconds. And to make the game a little easier, users also get a hint about the word they are trying to guess.

By creating this word game, you can gain hands-on experience with essential JavaScript concepts, including arrays, objects, functions, DOM manipulation, string manipulation, event listeners, and conditional statements.

6. Tic Tac Toe Game

Tic Tac Toe is a well-known game that you can build to improve your JavaScript skills. In this game, the player needs to get three of the same symbol in a row, either horizontally, vertically, or diagonally, to win. The second player in this game is the bot, which plays automatically after each player’s turn.

Creating a Tic Tac Toe game can help you develop critical thinking and problem-solving abilities. You’ll learn many important JavaScript concepts, such as DOM manipulation, conditional statements, functions, arrays, event listeners, and more.

It can be a fun way to learn and apply these fundamental concepts while also improving your understanding of game development.

7. Number Guessing Game

Random number guessing is an easy game to create that every beginner must try. This game involves the computer or bot selecting a random number that you have to guess correctly. The game provides hints to help you along the way, and you have ten chances to make the correct guess.

It’s a simple but enjoyable game that can help you learn the basics of JavaScript programming, game logic, CSS styling, and more.

8. Word Guessing Game

Word guessing is the second-word game on this list that you can create as a beginner. In this game, the user has to guess all the letters of a randomly generated word within a specified number of tries. The game provides hints to help make the guessing process easier.

This word game helps you learn how to use JavaScript concepts like setInterval, DOM manipulation, arrays, objects, etc. to create an engaging and interactive game that keeps users engaged and entertained.

9. Rock Paper Scissors Game

Rock, Paper, Scissors is a game that’s widely enjoyed by beginner developers who want to build a simple game. In this game, you’ll play against a bot or computer, and the rules are straightforward: rock beats scissors, scissors beat paper, and paper beats rock.

It’s an excellent game project to work on if you want to develop your skills while creating an entertaining game. You’ll have fun while learning essential programming concepts that can be applied to other projects in the future.

10. Classic Snake Game

Snake is a classic arcade game that many of us played as children. But now you can create your own version of the game using JavaScript. In this game, players must guide the snake to eat food that appears randomly on the board. The game will end if the snake hits a wall or its own body.

What makes this game even more exciting is that users can play it on a PC using keyboard arrow keys or on a mobile device using touch-based arrow buttons.

Creating a snake game helps you improve problem-solving skills and logical thinking. You’ll also gain a deep understanding of programming concepts like loops, arrays, conditional statements, DOM manipulation, and game loops.

Conclusion and Final Words

In conclusion, these JavaScript games offer a great opportunity for beginners to improve their coding and problem-solving skills. From a memory card to the snake, these game projects cover various aspects of web and game development, including HTML, CSS, and JavaScript.

Choose a game that interests you and get ready to code. I recommended that you try creating these projects on your own rather than simply copying the source code. So, you’ll gain hands-on experience with essential programming concepts that can help you develop a strong foundation for future projects.

Furthermore, you can check out my Top 10 JavaScript Projects for Beginners to get extra coding projects to learn. Remember, practice is key when it comes to coding, so keep coding and experimenting with new ideas to improve your skills. Happy Coding!

Create a Quiz App with Timer using HTML CSS & JavaScript

CodingNepal — Tue, 06 Oct 2020 10:12:00 +0000

Hello readers, Today in this blog you’ll learn how to Create a Quiz Application with Timer using HTML CSS & JavaScript. Earlier I’ve shared a blog on how to Create a Responsive Personal Portfolio Website and now it’s time to create Quiz Web App using JavaScript.

In this program [Quiz App with Timer], there are three layers or boxes, and these boxes shown one by one on a particular button clicked. At first, on the webpage, there is shown a button labeled as “Start Quiz” and when you clicked on that button, then the info box appears with popup animation.

In this infobox, there are some rules of the quiz and two buttons labeled as “Exit” and “Continue”. When you clicked on the Exit button, the info box will be hidden but when you clicked on the Continue button, then the Quiz Box appears.

In the Quiz Box, there is a header with a title on the left side and a timer box on the right side. This timer starts decrement from 15 to 0 sec and there is also shown a timeline indicator that is sliding from the left to right side according to the timer. If the user selects an option between 15 to 0 sec, the timer will be stopped and all available options will be disabled.

If the user selected option is correct, the selected option color, background color changed to green and there is also shown the tick icon to inform the user that the selected answer is correct. If the user selects an option that is incorrect, the selected option color, background color changed to red and there is shown the cross icon to inform the user that the selected option is incorrect and the correct option will be automatically selected.

If the user doesn’t select an option between 15 to 0 sec, the timer will be stopped once it comes in 0 and the correct option of that question will be selected automatically. After that, there is the next button to show the next question, and there is a total of five questions on this Quiz.

In the end, the result box will be appeared and shown the user score and two buttons [Replay Quiz, Quit Quiz], if the user clicked on the replay quiz button, the quiz will again start with the number 1 question, and the score of the user will be 0 but if the user clicked on the quit quiz button, the current window will be reloaded and the quiz starts from the begin.

Video Tutorial of Create a Quiz App with Timer

In the video, you have seen the actual preview of the Quiz Application with Timer and I hope you’ve understood the codes behind creating this Quiz Box layout. In this video, I’ve only written the HTML & CSS codes, and in the second part of this video, I’ve completed the JavaScript codes of this program. If you haven’t watched part 2 of this video, click here to watch it now.

You can use this Quiz and also you can add more questions to this Quiz. In the source codes, I’ve written many comments on how you can add more questions and explained each JavaScript line of this Quiz. If you’re a beginner, you may have difficulties understanding the JavaScript codes but you can easily understand the HTML & CSS codes and I’ve tried to explain all JavaScript line with comments, hope you will understand.

To create this program (Quiz Application with Timer). First, you need to create four Files one HTML File, CSS File and the other two are JavaScript files. After creating these files just paste the following codes in your file.

First, create an HTML file with the name of index.html and paste the given codes in your HTML file. Remember, you’ve to create a file with .html extension.






    
    
    Awesome Quiz App | CodingNepal
    
    
    


    
    

    
    
        Some Rules of this Quiz
        
            1. You will have only 15 seconds per each question.
            2. Once you select your answer, it can't be undone.
            3. You can't select any option once time goes off.
            4. You can't exit from the Quiz while you're playing.
            5. You'll get points on the basis of your correct answers.
        
        
            
            
        
    

    
    
        
            Awesome Quiz Application
            
                Time Left
                15
            
            
        
        
            
                
            
            
                
            
        

        
        
            
                
            
            
        
    

    
    
        
            
        
        You've completed the Quiz!

Second, create a CSS file with the name of style.css and paste the given codes in your CSS file. Remember, you’ve to create a file with .css extension.

/* importing google fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body{
    background: #007bff;
}

::selection{
    color: #fff;
    background: #007bff;
}

.start_btn,
.info_box,
.quiz_box,
.result_box{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 
                0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.info_box.activeInfo,
.quiz_box.activeQuiz,
.result_box.activeResult{
    opacity: 1;
    z-index: 5;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.start_btn button{
    font-size: 25px;
    font-weight: 500;
    color: #007bff;
    padding: 15px 30px;
    outline: none;
    border: none;
    border-radius: 5px;
    background: #fff;
    cursor: pointer;
}

.info_box{
    width: 540px;
    background: #fff;
    border-radius: 5px;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.info_box .info-title{
    height: 60px;
    width: 100%;
    border-bottom: 1px solid lightgrey;
    display: flex;
    align-items: center;
    padding: 0 30px;
    border-radius: 5px 5px 0 0;
    font-size: 20px;
    font-weight: 600;
}

.info_box .info-list{
    padding: 15px 30px;
}

.info_box .info-list .info{
    margin: 5px 0;
    font-size: 17px;
}

.info_box .info-list .info span{
    font-weight: 600;
    color: #007bff;
}
.info_box .buttons{
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 30px;
    border-top: 1px solid lightgrey;
}

.info_box .buttons button{
    margin: 0 5px;
    height: 40px;
    width: 100px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 5px;
    border: 1px solid #007bff;
    transition: all 0.3s ease;
}

.quiz_box{
    width: 550px;
    background: #fff;
    border-radius: 5px;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.quiz_box header{
    position: relative;
    z-index: 2;
    height: 70px;
    padding: 0 30px;
    background: #fff;
    border-radius: 5px 5px 0 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0px 3px 5px 1px rgba(0,0,0,0.1);
}

.quiz_box header .title{
    font-size: 20px;
    font-weight: 600;
}

.quiz_box header .timer{
    color: #004085;
    background: #cce5ff;
    border: 1px solid #b8daff;
    height: 45px;
    padding: 0 8px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 145px;
}

.quiz_box header .timer .time_left_txt{
    font-weight: 400;
    font-size: 17px;
    user-select: none;
}

.quiz_box header .timer .timer_sec{
    font-size: 18px;
    font-weight: 500;
    height: 30px;
    width: 45px;
    color: #fff;
    border-radius: 5px;
    line-height: 30px;
    text-align: center;
    background: #343a40;
    border: 1px solid #343a40;
    user-select: none;
}

.quiz_box header .time_line{
    position: absolute;
    bottom: 0px;
    left: 0px;
    height: 3px;
    background: #007bff;
}

section{
    padding: 25px 30px 20px 30px;
    background: #fff;
}

section .que_text{
    font-size: 25px;
    font-weight: 600;
}

section .option_list{
    padding: 20px 0px;
    display: block;   
}

section .option_list .option{
    background: aliceblue;
    border: 1px solid #84c5fe;
    border-radius: 5px;
    padding: 8px 15px;
    font-size: 17px;
    margin-bottom: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

section .option_list .option:last-child{
    margin-bottom: 0px;
}

section .option_list .option:hover{
    color: #004085;
    background: #cce5ff;
    border: 1px solid #b8daff;
}

section .option_list .option.correct{
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
}

section .option_list .option.incorrect{
    color: #721c24;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
}

section .option_list .option.disabled{
    pointer-events: none;
}

section .option_list .option .icon{
    height: 26px;
    width: 26px;
    border: 2px solid transparent;
    border-radius: 50%;
    text-align: center;
    font-size: 13px;
    pointer-events: none;
    transition: all 0.3s ease;
    line-height: 24px;
}
.option_list .option .icon.tick{
    color: #23903c;
    border-color: #23903c;
    background: #d4edda;
}

.option_list .option .icon.cross{
    color: #a42834;
    background: #f8d7da;
    border-color: #a42834;
}

footer{
    height: 60px;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid lightgrey;
}

footer .total_que span{
    display: flex;
    user-select: none;
}

footer .total_que span p{
    font-weight: 500;
    padding: 0 5px;
}

footer .total_que span p:first-child{
    padding-left: 0px;
}

footer button{
    height: 40px;
    padding: 0 13px;
    font-size: 18px;
    font-weight: 400;
    cursor: pointer;
    border: none;
    outline: none;
    color: #fff;
    border-radius: 5px;
    background: #007bff;
    border: 1px solid #007bff;
    line-height: 10px;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
    transition: all 0.3s ease;
}

footer button:hover{
    background: #0263ca;
}

footer button.show{
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}

.result_box{
    background: #fff;
    border-radius: 5px;
    display: flex;
    padding: 25px 30px;
    width: 450px;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.result_box .icon{
    font-size: 100px;
    color: #007bff;
    margin-bottom: 10px;
}

.result_box .complete_text{
    font-size: 20px;
    font-weight: 500;
}

.result_box .score_text span{
    display: flex;
    margin: 10px 0;
    font-size: 18px;
    font-weight: 500;
}

.result_box .score_text span p{
    padding: 0 4px;
    font-weight: 600;
}

.result_box .buttons{
    display: flex;
    margin: 20px 0;
}

.result_box .buttons button{
    margin: 0 10px;
    height: 45px;
    padding: 0 20px;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 5px;
    border: 1px solid #007bff;
    transition: all 0.3s ease;
}

.buttons button.restart{
    color: #fff;
    background: #007bff;
}

.buttons button.restart:hover{
    background: #0263ca;
}

.buttons button.quit{
    color: #007bff;
    background: #fff;
}

.buttons button.quit:hover{
    color: #fff;
    background: #007bff;
}

Last, create a JavaScript file with the name of questions.js and paste the given codes in your JavaScript file. Remember, you’ve to create a file with .js extension. In this file, we store all questions in an array.

// creating an array and passing the number, questions, options, and answers
let questions = [
    {
    numb: 1,
    question: "What does HTML stand for?",
    answer: "Hyper Text Markup Language",
    options: [
      "Hyper Text Preprocessor",
      "Hyper Text Markup Language",
      "Hyper Text Multiple Language",
      "Hyper Tool Multi Language"
    ]
  },
    {
    numb: 2,
    question: "What does CSS stand for?",
    answer: "Cascading Style Sheet",
    options: [
      "Common Style Sheet",
      "Colorful Style Sheet",
      "Computer Style Sheet",
      "Cascading Style Sheet"
    ]
  },
    {
    numb: 3,
    question: "What does PHP stand for?",
    answer: "Hypertext Preprocessor",
    options: [
      "Hypertext Preprocessor",
      "Hypertext Programming",
      "Hypertext Preprogramming",
      "Hometext Preprocessor"
    ]
  },
    {
    numb: 4,
    question: "What does SQL stand for?",
    answer: "Structured Query Language",
    options: [
      "Stylish Question Language",
      "Stylesheet Query Language",
      "Statement Question Language",
      "Structured Query Language"
    ]
  },
    {
    numb: 5,
    question: "What does XML stand for?",
    answer: "eXtensible Markup Language",
    options: [
      "eXtensible Markup Language",
      "eXecutable Multiple Language",
      "eXTra Multi-Program Language",
      "eXamine Multiple Language"
    ]
  },
  // you can uncomment the below codes and make duplicate as more as you want to add question
  // but remember you need to give the numb value serialize like 1,2,3,5,6,7,8,9.....

  //   {
  //   numb: 6,
  //   question: "Your Question is Here",
  //   answer: "Correct answer of the question is here",
  //   options: [
  //     "Option 1",
  //     "option 2",
  //     "option 3",
  //     "option 4"
  //   ]
  // },
];

Last, create a JavaScript file with the name of script.js and paste the given codes in your JavaScript file. Remember, you’ve to create a file with .js extension.

//selecting all required elements
const start_btn = document.querySelector(".start_btn button");
const info_box = document.querySelector(".info_box");
const exit_btn = info_box.querySelector(".buttons .quit");
const continue_btn = info_box.querySelector(".buttons .restart");
const quiz_box = document.querySelector(".quiz_box");
const result_box = document.querySelector(".result_box");
const option_list = document.querySelector(".option_list");
const time_line = document.querySelector("header .time_line");
const timeText = document.querySelector(".timer .time_left_txt");
const timeCount = document.querySelector(".timer .timer_sec");

// if startQuiz button clicked
start_btn.onclick = ()=>{
    info_box.classList.add("activeInfo"); //show info box
}

// if exitQuiz button clicked
exit_btn.onclick = ()=>{
    info_box.classList.remove("activeInfo"); //hide info box
}

// if continueQuiz button clicked
continue_btn.onclick = ()=>{
    info_box.classList.remove("activeInfo"); //hide info box
    quiz_box.classList.add("activeQuiz"); //show quiz box
    showQuetions(0); //calling showQestions function
    queCounter(1); //passing 1 parameter to queCounter
    startTimer(15); //calling startTimer function
    startTimerLine(0); //calling startTimerLine function
}

let timeValue =  15;
let que_count = 0;
let que_numb = 1;
let userScore = 0;
let counter;
let counterLine;
let widthValue = 0;

const restart_quiz = result_box.querySelector(".buttons .restart");
const quit_quiz = result_box.querySelector(".buttons .quit");

// if restartQuiz button clicked
restart_quiz.onclick = ()=>{
    quiz_box.classList.add("activeQuiz"); //show quiz box
    result_box.classList.remove("activeResult"); //hide result box
    timeValue = 15; 
    que_count = 0;
    que_numb = 1;
    userScore = 0;
    widthValue = 0;
    showQuetions(que_count); //calling showQestions function
    queCounter(que_numb); //passing que_numb value to queCounter
    clearInterval(counter); //clear counter
    clearInterval(counterLine); //clear counterLine
    startTimer(timeValue); //calling startTimer function
    startTimerLine(widthValue); //calling startTimerLine function
    timeText.textContent = "Time Left"; //change the text of timeText to Time Left
    next_btn.classList.remove("show"); //hide the next button
}

// if quitQuiz button clicked
quit_quiz.onclick = ()=>{
    window.location.reload(); //reload the current window
}

const next_btn = document.querySelector("footer .next_btn");
const bottom_ques_counter = document.querySelector("footer .total_que");

// if Next Que button clicked
next_btn.onclick = ()=>{
    if(que_count < questions.length - 1){ //if question count is less than total question length
        que_count++; //increment the que_count value
        que_numb++; //increment the que_numb value
        showQuetions(que_count); //calling showQestions function
        queCounter(que_numb); //passing que_numb value to queCounter
        clearInterval(counter); //clear counter
        clearInterval(counterLine); //clear counterLine
        startTimer(timeValue); //calling startTimer function
        startTimerLine(widthValue); //calling startTimerLine function
        timeText.textContent = "Time Left"; //change the timeText to Time Left
        next_btn.classList.remove("show"); //hide the next button
    }else{
        clearInterval(counter); //clear counter
        clearInterval(counterLine); //clear counterLine
        showResult(); //calling showResult function
    }
}

// getting questions and options from array
function showQuetions(index){
    const que_text = document.querySelector(".que_text");

    //creating a new span and div tag for question and option and passing the value using array index
    let que_tag = ''+ questions[index].numb + ". " + questions[index].question +'';
    let option_tag = ''+ questions[index].options[0] +''
    + ''+ questions[index].options[1] +''
    + ''+ questions[index].options[2] +''
    + ''+ questions[index].options[3] +'';
    que_text.innerHTML = que_tag; //adding new span tag inside que_tag
    option_list.innerHTML = option_tag; //adding new div tag inside option_tag
    
    const option = option_list.querySelectorAll(".option");

    // set onclick attribute to all available options
    for(i=0; i < option.length; i++){
        option[i].setAttribute("onclick", "optionSelected(this)");
    }
}
// creating the new div tags which for icons
let tickIconTag = '';
let crossIconTag = '';

//if user clicked on option
function optionSelected(answer){
    clearInterval(counter); //clear counter
    clearInterval(counterLine); //clear counterLine
    let userAns = answer.textContent; //getting user selected option
    let correcAns = questions[que_count].answer; //getting correct answer from array
    const allOptions = option_list.children.length; //getting all option items
    
    if(userAns == correcAns){ //if user selected option is equal to array's correct answer
        userScore += 1; //upgrading score value with 1
        answer.classList.add("correct"); //adding green color to correct selected option
        answer.insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to correct selected option
        console.log("Correct Answer");
        console.log("Your correct answers = " + userScore);
    }else{
        answer.classList.add("incorrect"); //adding red color to correct selected option
        answer.insertAdjacentHTML("beforeend", crossIconTag); //adding cross icon to correct selected option
        console.log("Wrong Answer");

        for(i=0; i < allOptions; i++){
            if(option_list.children[i].textContent == correcAns){ //if there is an option which is matched to an array answer 
                option_list.children[i].setAttribute("class", "option correct"); //adding green color to matched option
                option_list.children[i].insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to matched option
                console.log("Auto selected correct answer.");
            }
        }
    }
    for(i=0; i < allOptions; i++){
        option_list.children[i].classList.add("disabled"); //once user select an option then disabled all options
    }
    next_btn.classList.add("show"); //show the next button if user selected any option
}

function showResult(){
    info_box.classList.remove("activeInfo"); //hide info box
    quiz_box.classList.remove("activeQuiz"); //hide quiz box
    result_box.classList.add("activeResult"); //show result box
    const scoreText = result_box.querySelector(".score_text");
    if (userScore > 3){ // if user scored more than 3
        //creating a new span tag and passing the user score number and total question number
        let scoreTag = 'and congrats! , You got '+ userScore +'
 out of '+ questions.length +'';
        scoreText.innerHTML = scoreTag;  //adding new span tag inside score_Text
    }
    else if(userScore > 1){ // if user scored more than 1
        let scoreTag = 'and nice , You got '+ userScore +'
 out of '+ questions.length +'';
        scoreText.innerHTML = scoreTag;
    }
    else{ // if user scored less than 1
        let scoreTag = 'and sorry , You got only '+ userScore +'
 out of '+ questions.length +'';
        scoreText.innerHTML = scoreTag;
    }
}

function startTimer(time){
    counter = setInterval(timer, 1000);
    function timer(){
        timeCount.textContent = time; //changing the value of timeCount with time value
        time--; //decrement the time value
        if(time < 9){ //if timer is less than 9
            let addZero = timeCount.textContent; 
            timeCount.textContent = "0" + addZero; //add a 0 before time value
        }
        if(time < 0){ //if timer is less than 0
            clearInterval(counter); //clear counter
            timeText.textContent = "Time Off"; //change the time text to time off
            const allOptions = option_list.children.length; //getting all option items
            let correcAns = questions[que_count].answer; //getting correct answer from array
            for(i=0; i < allOptions; i++){
                if(option_list.children[i].textContent == correcAns){ //if there is an option which is matched to an array answer
                    option_list.children[i].setAttribute("class", "option correct"); //adding green color to matched option
                    option_list.children[i].insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to matched option
                    console.log("Time Off: Auto selected correct answer.");
                }
            }
            for(i=0; i < allOptions; i++){
                option_list.children[i].classList.add("disabled"); //once user select an option then disabled all options
            }
            next_btn.classList.add("show"); //show the next button if user selected any option
        }
    }
}

function startTimerLine(time){
    counterLine = setInterval(timer, 29);
    function timer(){
        time += 1; //upgrading time value with 1
        time_line.style.width = time + "px"; //increasing width of time_line with px by time value
        if(time > 549){ //if time value is greater than 549
            clearInterval(counterLine); //clear counterLine
        }
    }
}

function queCounter(index){
    //creating a new span tag and passing the question number and total question
    let totalQueCounTag = ''+ index +'
 of '+ questions.length +'
 Questions';
    bottom_ques_counter.innerHTML = totalQueCounTag;  //adding new span tag inside bottom_ques_counter
}

That’s all, now you’ve successfully created a Create a Quiz App with Timer using HTML CSS & JavaScript. If your code doesn’t work or you’ve faced any error/problem then please download the source code files from the given download button. It’s free and a .zip file will be downloaded then you’ve to extract it.