js.js

// creating an array and passing the number, questions, options, and answers
let questions = [
    {
    numb: 1,
    question: "Sustainable development has ___ main pillars",
    answer: "4",
    options: [
      "1",
      "6",
      "17",
      "4"
    ]
  },
    {
    numb: 2,
    question: "How many R's are there",
    answer: "4",
    options: [
      "4",
      "2",
      "8",
      "100"
    ]
  },
    {
    numb: 3,
    question: "To create a newline at the end of prompt, you can use which of the following expressions? _ \_",
    answer: "n",
    options: [
      "new",
      "break",
      "return",
      "n"
    ]
  },
    {
    numb: 4,
    question: "The number or word we give to a variable",
    answer: "Value",
    options: [
      "Value",
      "Bug",
      "Text",
      "Information"    
    ]
  },
    {
    numb: 5,
    question: "What will the output be from the following code? print(“Hello world Hello world“)",
    answer: "Hello world Hello world",
    options: [
      "Hello world Hello world",
      "SyntaxError",
      "ConsoleError",
      "StringError"
    ]
  },
  // 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: "The statements that keep repeating themselves as long as a given condition is true are called ___",
answer: "Iterative Statements",
options: [
          "Iterative Statements",
          "Counter Statements",
          "Control Statements",
          "None"
]
},
    {
numb: 7,
question: "The __ loop is used when you are sure about how many times a loop body will be executed",
answer: "For",
options: [
          "For",
          "Syntax",
          "In",
          "False"
]
},
    
        {
numb: 8,
question: "The ____ function used with for loop in Python is helpful in generating a sequence of numbers in the form of a list.",
answer: "Range",
options: [
          "Range",
          "Step",
          "Final",
          "Initial"
]
},
        
        {
numb: 9,
question: "What will be the answer of the following code for i in range (10 , 20, 3 ) print(i)",
answer: "10,13,16,19",
options: [
          "10,13,16,19",
          "1,3,5,6",
          "19,293,203,49",
          "12,323,432,544"
]
},    
        {
numb: 10,
question: "In which category does Quality Education come in?",
answer: "Social",
options: [
          "Social",
          "Economical",
          "Environmental",
          "None"
]
},    
    {
numb: 11,
question: "_____ is used to assign an initial value to the loop control variable",
answer: "INITIALISATION",
options: [
          "INITIALISATION",
          "TEST",
          "CONDITION",
          "WHILE"
]
},    {
numb: 12,
question: "On which day did the 17 SDG's came into force",
answer: "1 January 2016",
options: [
          "1 January 2016",
          "1 February 2016",
          "1 January 2029",
          "1 April 2020"
]
},    {
numb: 13,
question: "In which category does Zero Hunger come in?",
answer: "Social",
options: [
          "Social",
          "Economical",
          "Environmental",
          "None"
]
},    {
numb: 14,
question: "In which category does Life Below Water come in?",
answer: "Environmental",
options: [
          "Social",
          "Economical",
          "Environmental",
          "None"
]
},        {
numb: 15,
question: "Economical Development should be _____",
answer: "Equitable",
options: [
          "Equitable",
          "Vital",
          "Viable",
          "Policy"
]
},
];
//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 = '<span>'+ questions[index].numb + ". " + questions[index].question +'</span>';
    let option_tag = '<div class="option"><span>'+ questions[index].options[0] +'</span></div>'
    + '<div class="option"><span>'+ questions[index].options[1] +'</span></div>'
    + '<div class="option"><span>'+ questions[index].options[2] +'</span></div>'
    + '<div class="option"><span>'+ questions[index].options[3] +'</span></div>';
    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 = '<div class="icon tick"><i class="fas fa-check"></i></div>';
let crossIconTag = '<div class="icon cross"><i class="fas fa-times"></i></div>';

//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 > 8){ // if user scored more than 5
        //creating a new span tag and passing the user score number and total question number
        let scoreTag = '<span>and congrats! 🎉, You got <p>'+ userScore +'</p> out of <p>'+ questions.length +'</p></span>';
        scoreText.innerHTML = scoreTag;  //adding new span tag inside score_Text
    }
    else if(userScore > 5){ // if user scored more than 5
        let scoreTag = '<span>and nice 😎, You got <p>'+ userScore +'</p> out of <p>'+ questions.length +'</p></span>';
        scoreText.innerHTML = scoreTag;
    }
    else{ // if user scored less than 5
        let scoreTag = '<span>and sorry 😐, You got only <p>'+ userScore +'</p> out of <p>'+ questions.length +'</p></span>';
        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 = '<span><p>'+ index +'</p> of <p>'+ questions.length +'</p> Questions</span>';
    bottom_ques_counter.innerHTML = totalQueCounTag;  //adding new span tag inside bottom_ques_counter
}