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script.js
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script.js
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window.addEventListener('load', init);
var quiz = [
{ sum1: 3, sum2: 6 },
{ sum1: 3, sum2: 7 },
{ sum1: 3, sum2: 8 },
{ sum1: 3, sum2: 9 },
{ sum1: 3, sum2: 12 },
{ sum1: 4, sum2: 5 },
{ sum1: 4, sum2: 6 },
{ sum1: 4, sum2: 7 },
{ sum1: 4, sum2: 8 },
{ sum1: 4, sum2: 9 },
{ sum1: 4, sum2: 8 },
{ sum1: 5, sum2: 4 },
{ sum1: 6, sum2: 4 },
{ sum1: 6, sum2: 7 },
{ sum1: 6, sum2: 8 },
{ sum1: 6, sum2: 9 },
{ sum1: 6, sum2: 11 },
{ sum1: 6, sum2: 12 },
{ sum1: 7, sum2: 2 },
{ sum1: 7, sum2: 3 },
{ sum1: 7, sum2: 4 },
{ sum1: 7, sum2: 5 },
{ sum1: 7, sum2: 6 },
{ sum1: 7, sum2: 7 },
{ sum1: 7, sum2: 8 },
{ sum1: 7, sum2: 9 },
{ sum1: 7, sum2: 10 },
{ sum1: 7, sum2: 11 },
{ sum1: 7, sum2: 12 },
{ sum1: 8, sum2: 2 },
{ sum1: 8, sum2: 3 },
{ sum1: 8, sum2: 4 },
{ sum1: 8, sum2: 5 },
{ sum1: 8, sum2: 6 },
{ sum1: 8, sum2: 7 },
{ sum1: 8, sum2: 8 },
{ sum1: 8, sum2: 9 },
{ sum1: 8, sum2: 10 },
{ sum1: 8, sum2: 11 },
{ sum1: 8, sum2: 12 },
{ sum1: 9, sum2: 2 },
{ sum1: 9, sum2: 3 },
{ sum1: 9, sum2: 4 },
{ sum1: 9, sum2: 5 },
{ sum1: 9, sum2: 6 },
{ sum1: 9, sum2: 7 },
{ sum1: 9, sum2: 8 },
{ sum1: 9, sum2: 9 },
{ sum1: 9, sum2: 10 },
{ sum1: 9, sum2: 11 },
{ sum1: 9, sum2: 12 },
];
let time = 60;
let score = 0;
let isPlaying;
var q1; //question 1
var q2; //question 2
var answer; //answer
var display; // display screen
//DOM abbriviation variables
const domInput = document.querySelector("#myInput");
const domOutput = document.querySelector("#myOutput");
const domQuestion = document.querySelector("#myQuestion");
const domTime = document.querySelector("#myTime");
const domScore = document.querySelector("#myScore");
// Initialize Quiz
function init() {
//load sum from array
showSum(quiz);
//start matching on sum input
// domInput.addEventListener('input', startMatch);
//call countdown ever n seconds
setInterval(countdown, 1000);
//check game status
setInterval(checkStatus, 50);
console.log("next..");
}
//start match
function startMatch() {
if (matchSums()) {
isPlaying = true;
time = 66;
showSum(quiz);
domInput.value = '';
score++;
}
domScore.innerHTML = "Score: " + score;
}
//match current sum to sum input
function matchSums() {
// use == as adding text + number
// === you use 'parseInt' on value and array
if (parseInt(domInput.value) === answer) {
domOutput.value = "(" + answer + ") " + "Correct!";
return true;
} else {
domInput.value = '';
domOutput.value = "Wrong! " + "(" + answer + ")";
return false;
}
}
//pick and show random sum
function showSum(quiz) {
//generate random array index
const randIndex = Math.floor(Math.random() * quiz.length);
display = quiz[randIndex].sum1 + " x " + quiz[randIndex].sum2;
answer = parseInt(quiz[randIndex].sum1 * quiz[randIndex].sum2);
//output random sum
// document.getElementById("myQuestion").value = display;
// document.getElementById("myOutput").value = answer;
// Practice Mode Show answer
// domOutput.value = answer;
domQuestion.value = display;
}
//countdown timer
function countdown() {
//make sure time is not run out
if (time > 0) {
//decrement
time--;
} else if (time === 0) {
//game over
isPlaying = false;
}
//show time
domTime.innerHTML = "Time Left: " + time;
}
//check game status
function checkStatus() {
if (!isPlaying && time === 0) {
domQuestion.value = "Game Over!";
}
}
// interact display section
function checkBtn(evt) {
switch (evt) {
case 'enter':
checkAnswer();
break;
case 'C':
clearAnswer();
break;
case 'delete':
deleteAnswer();
break;
case 'ok':
okAnswer();
break;
default:
domInput.value += evt;
}
}
function clearAnswer() {
document.getElementById("myInput").value = "";
}
function deleteAnswer() {
tmpString = document.getElementById("myInput").value
tmpString = tmpString.slice(0, -1);
document.getElementById("myInput").value = tmpString;
}
function okAnswer() {
// reload browser
location.reload();
// document.getElementById("myInput").value = "OK";
}
function checkAnswer() {
startMatch();
// document.getElementById("myInput").value = "CHECK";
}