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quiz.php
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quiz.php
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<!DOCTYPE html>
<html>
<head>
<title>LLR Test</title>
</head>
<body>
<div id="quiz"> </div>
<button id="submit">Submit Quiz</button>
<div id="results"> </div>
<script type="text/javascript">
const quizContainer = document.getElementById('quiz');
const resultsContainer = document.getElementById('results');
const submitButton = document.getElementById('submit');
const myQuestions = [
{
question: "Who invented JavaScript?",
answers: {
a: "Douglas Crockford",
b: "Sheryl Sandberg",
c: "Brendan Eich"
},
correctAnswer: "c"
},
{
question: "Which one of these is a JavaScript package manager?",
answers: {
a: "Node.js",
b: "TypeScript",
c: "npm"
},
correctAnswer: "c"
},
{
question: "Which tool can you use to ensure code quality?",
answers: {
a: "Angular",
b: "jQuery",
c: "RequireJS",
d: "ESLint"
},
correctAnswer: "d"
}
];
function buildQuiz(){
// variable to store the HTML output
const output = [];
// for each question...
myQuestions.forEach(
(currentQuestion, questionNumber) => {
// variable to store the list of possible answers
const answers = [];
// and for each available answer...
for(letter in currentQuestion.answers){
// ...add an HTML radio button
answers.push(
`<label>
<input type="radio" name="question${questionNumber}" value="${letter}">
${letter} :
${currentQuestion.answers[letter]}
</label>`
);
}
// add this question and its answers to the output
output.push(
`<div class="question"> ${currentQuestion.question} </div>
<div class="answers"> ${answers.join('')} </div>`
);
}
);
// finally combine our output list into one string of HTML and put it on the page
quizContainer.innerHTML = output.join(' ');
}
function showResults(){
// gather answer containers from our quiz
const answerContainers = quizContainer.querySelectorAll('.answers');
// keep track of user's answers
let numCorrect = 0;
// for each question...
myQuestions.forEach( (currentQuestion, questionNumber) => {
// find selected answer
const answerContainer = answerContainers[questionNumber];
const selector = `input[name=question${questionNumber}]:checked`;
const userAnswer = (answerContainer.querySelector(selector) || {}).value;
// if answer is correct
if(userAnswer === currentQuestion.correctAnswer){
// add to the number of correct answers
numCorrect++;
// color the answers green
answerContainers[questionNumber].style.color = 'lightgreen';
}
// if answer is wrong or blank
else{
// color the answers red
answerContainers[questionNumber].style.color = 'red';
}
});
// show number of correct answers out of total
resultsContainer.innerHTML = `${numCorrect} out of ${myQuestions.length}`;
}
buildQuiz();
// gather answer containers from our quiz
const answerContainers = quizContainer.querySelectorAll('.answers');
// keep track of user's answers
let numCorrect = 0;
const answerContainer = answerContainers[questionNumber];
const selector = `input[name=question${questionNumber}]:checked`;
const userAnswer = (answerContainer.querySelector(selector) || {}).value;
submitButton.addEventListener('click', showResults);
</script>
</body>
</html>