javascript – 如何阻止用户在我的测验中选择多个答案？
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我遇到的问题是,一旦用户选择了答案,然后点击“提交答案”并收到他们的反馈,他们就可以继续点击并选择其他答案,然后再进入下一个问题.如何在用户提交一个答案后阻止用户执行此操作？
let score = 0;
let currentQuestion = 0;
let questions = [{
title: "At what age was Harry Potter when he received his Hogwarts letter?",
answers: ['7', '10', '11', '13'],
correct: 1
},
{
title: "Which is not a Hogwarts house?",
answers: ['Dunder Mifflin', 'Ravenclaw', 'Slytherin', 'Gryffindor'],
correct: 0
},
{
title: "Who teaches Transfiguration at Hogwarts?",
answers: ['Rubeus Hagrid', 'Albus Dumbledore', 'Severus Snape', 'Minerva McGonnagle'],
correct: 3
},
{
title: "Where is Hogwarts School for Witchcraft and Wizardry located?",
answers: ['France', 'USA', 'UK', 'New Zealand'],
correct: 2
},
{
title: "What form does Harry Potter's patronus charm take?",
answers: ['Stag', 'Eagle', 'Bear', 'Dragon'],
correct: 0
},
{
title: "What type of animal is Harry's pet?",
answers: ['Dog', 'Owl', 'Cat', 'Snake'],
correct: 1
},
{
title: "Who is not a member of the Order of the Phoenix?",
answers: ['Remus Lupin', 'Siruis Black', 'Lucious Malfoy', 'Severus Snape'],
correct: 2
},
{
title: "What is not a piece of the Deathly Hallows?",
answers: ['Elder Wand', 'Cloak of Invisibility', 'Resurrection Stone', 'Sword of Gryffindor'],
correct: 3
},
{
title: "In which house is Harry sorted into after arriving at Hogwarts?",
answers: ['Slytherin', 'Ravenclaw', 'Gryffindor', 'Hufflepuff'],
correct: 2
},
{
title: "What prevented Voldemort from being able to kill Harry Potter when he was a baby?",
answers: ['Love', 'Anger', 'Friendship', 'Joy'],
correct: 0
},
];
$(document).ready(function() {
$('.start a').click(function(e) {
e.preventDefault();
$('.start').hide();
$('.quiz').show();
showQuestion();
});
$('.quiz').on('click', 'button', function() {
$('.selected').removeClass('selected');
$(this).addClass('selected');
});
$('.quiz a.submit').click(function(e) {
e.preventDefault();
if ($('button.selected').length) {
let guess = parseInt($('button.selected').attr('id'));
checkAnswer(guess);
} else {
alert('Please select an answer');
}
});
$('.summary a').click(function(e) {
e.preventDefault();
restartQuiz();
});
});
function showQuestion() {
let question = questions[currentQuestion];
$('.quiz h2').text(question.title);
$('.quiz div:nth-child(2)').html('');
for (var i = 0; i < question.answers.length; i++) {
$('.quiz div:nth-child(2)').append(`<button id="${i}">${question.answers[i]}</button>`);
}
showProgress();
}
function showIncorrectQuestion(guess) {
let question = questions[currentQuestion];
$('.quiz h2').text(question.title);
$('.quiz div:nth-child(2)').html('');
for (var i = 0; i < question.answers.length; i++) {
let cls = i === question.correct ? "selected" : guess === i ? "wrong" : ""
$('.quiz div:nth-child(2)').append(`<button id="${i}" class="${cls}">${question.answers[i]}</button>`);
}
showProgress();
}
function checkAnswer(guess) {
let question = questions[currentQuestion];
if (question.correct === guess) {
if (!question.alreadyAnswered) {
score++;
}
showIsCorrect(true);
} else {
showIsCorrect(false);
showIncorrectQuestion(guess);
}
question.alreadyAnswered = true;
}
function showSummary() {
$('.quiz').hide();
$('.summary').show();
$('.summary p').text("Thank you for taking the quiz! Here's how you scored. You answered " + score + " out of " + questions.length + " correctly! Care to try again?")
}
function restartQuiz() {
questions.forEach(q => q.alreadyAnswered = false);
$('.summary').hide();
$('.quiz').show();
score = 0;
currentQuestion = 0;
showQuestion();
}
function showProgress() {
$('#currentQuestion').html(currentQuestion + " out of " + questions.length);
}
function showIsCorrect(isCorrect) {
var result = "Wrong";
if (isCorrect) {
result = "Correct";
}
$('#isCorrect').html(result);
$('.navigate').show();
$('.submit').hide();
}
$('.navigate').click(function() {
currentQuestion++;
if (currentQuestion >= questions.length) {
showSummary();
} else {
showQuestion();
}
$('.navigate').hide();
$('.submit').show();
$('#isCorrect').html('');
})* {
padding: 0;
margin: 0;
box-sizing: border-box;
text-decoration: none;
text-align: center;
background-color: #837F73;
}
h1 {
font-family: 'Poor Story', cursive;
background-color: #950002;
padding: 60px;
color: #FFAB0D;
text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}
h2 {
font-family: 'Poor Story', cursive;
font-size: 30px;
padding: 60px;
background-color: #950002;
color: #FFAB0D;
text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}
p {
font-family: 'Poor Story', cursive;
background-color: #FFAB0D;
font-size: 20px;
font-weight: bold;
}
a {
border: 1px solid #222F5B;
padding: 10px;
background-color: #222F5B;
color: silver;
border-radius: 5px;
margin-top: 50px;
display: inline-block;
}
a:hover {
border: 1px solid #000000;
background-color: #000000;
color: #FCBF2B;
}
.quiz button {
cursor: pointer;
border: 1px solid;
display: inline-block;
width: 200px;
margin: 10px;
font-family: 'Poor Story', cursive;
font-size: 26px;
}
#currentQuestion {
color: #000000;
font-size: 18px;
font-family: 'Poor Story', cursive;
margin-top: 10px;
}
#isCorrect {
color: white;
font-family: 'Poor Story', cursive;
font-weight: bold;
font-size: 18px;
}
.quiz,
.summary {
display: none;
}
.quiz ul {
margin-top: 20px;
list-style: none;
padding: 0;
}
.selected {
background-color: #398C3F;
}
.wrong {
background-color: red;
}<html lang="en">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://fonts.googleapis.com/css?family=Poor+Story" rel="stylesheet">
<link href="style.css" rel="stylesheet" type="text/css" />
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Harry Potter Quiz</title>
</head>
<body>
<header role="banner">
<div class="start">
<h1>How Well Do You Know Harry Potter?</h1>
<a href="#">Start Quiz</a>
</div>
</header>
<main role="main">
<div class="quiz">
<h2>Question Title</h2>
<div>
<button>Choice</button>
<button>Choice</button>
<button>Choice</button>
<button>Choice</button>
</div>
<a class="submit" href="#">Submit Answer</a>
<a class="navigate" style="display:none;" href="#">Next Question</a>
<div id="currentQuestion"></div>
<footer role="contentinfo">
<div id="isCorrect"></div>
</footer>
</div>
</main>
<div class="summary">
<h2>Results</h2>
<p>Thank you for taking the quiz! Here's how you scored. You answered x out of y correctly! Care to try again?</p>
<a href="#">Retake Quiz</a>
</div>
<script src="index.js"></script>
<!--jQuery script when using JSBin-->
<!--<script src="https://code.jquery.com/jquery-3.1.0.js"></script>-->
</body>
</html>解决方法:
我已经声明了一个名为buttonClickable的变量,并在每次单击按钮时将其用作标志.当用户提交答案时,buttonclickable变为false,当你呈现新问题时,buttonclickable变为true.
let score = 0;
let currentQuestion = 0;
let buttonClickable = true;
let questions = [{
title: "At what age was Harry Potter when he received his Hogwarts letter?",
answers: ['7', '10', '11', '13'],
correct: 1
},
{
title: "Which is not a Hogwarts house?",
answers: ['Dunder Mifflin', 'Ravenclaw', 'Slytherin', 'Gryffindor'],
correct: 0
},
{
title: "Who teaches Transfiguration at Hogwarts?",
answers: ['Rubeus Hagrid', 'Albus Dumbledore', 'Severus Snape', 'Minerva McGonnagle'],
correct: 3
},
{
title: "Where is Hogwarts School for Witchcraft and Wizardry located?",
answers: ['France', 'USA', 'UK', 'New Zealand'],
correct: 2
},
{
title: "What form does Harry Potter's patronus charm take?",
answers: ['Stag', 'Eagle', 'Bear', 'Dragon'],
correct: 0
},
{
title: "What type of animal is Harry's pet?",
answers: ['Dog', 'Owl', 'Cat', 'Snake'],
correct: 1
},
{
title: "Who is not a member of the Order of the Phoenix?",
answers: ['Remus Lupin', 'Siruis Black', 'Lucious Malfoy', 'Severus Snape'],
correct: 2
},
{
title: "What is not a piece of the Deathly Hallows?",
answers: ['Elder Wand', 'Cloak of Invisibility', 'Resurrection Stone', 'Sword of Gryffindor'],
correct: 3
},
{
title: "In which house is Harry sorted into after arriving at Hogwarts?",
answers: ['Slytherin', 'Ravenclaw', 'Gryffindor', 'Hufflepuff'],
correct: 2
},
{
title: "What prevented Voldemort from being able to kill Harry Potter when he was a baby?",
answers: ['Love', 'Anger', 'Friendship', 'Joy'],
correct: 0
},
];
$(document).ready(function() {
$('.start a').click(function(e) {
e.preventDefault();
$('.start').hide();
$('.quiz').show();
showQuestion();
});
$('.quiz').on('click', 'button', function() {
if(!buttonClickable) return;
$('.selected').removeClass('selected');
$(this).addClass('selected');
});
$('.quiz a.submit').click(function(e) {
e.preventDefault();
if ($('button.selected').length) {
let guess = parseInt($('button.selected').attr('id'));
checkAnswer(guess);
} else {
alert('Please select an answer');
}
});
$('.summary a').click(function(e) {
e.preventDefault();
restartQuiz();
});
});
function showQuestion() {
buttonClickable = true;
let question = questions[currentQuestion];
$('.quiz h2').text(question.title);
$('.quiz div:nth-child(2)').html('');
for (var i = 0; i < question.answers.length; i++) {
$('.quiz div:nth-child(2)').append(`<button id="${i}">${question.answers[i]}</button>`);
}
showProgress();
}
function showIncorrectQuestion(guess) {
let question = questions[currentQuestion];
$('.quiz h2').text(question.title);
$('.quiz div:nth-child(2)').html('');
for (var i = 0; i < question.answers.length; i++) {
let cls = i === question.correct ? "selected" : guess === i ? "wrong" : ""
$('.quiz div:nth-child(2)').append(`<button id="${i}" class="${cls}">${question.answers[i]}</button>`);
}
showProgress();
}
function checkAnswer(guess) {
buttonClickable = false;
let question = questions[currentQuestion];
if (question.correct === guess) {
if (!question.alreadyAnswered) {
score++;
}
showIsCorrect(true);
} else {
showIsCorrect(false);
showIncorrectQuestion(guess);
}
question.alreadyAnswered = true;
}
function showSummary() {
$('.quiz').hide();
$('.summary').show();
$('.summary p').text("Thank you for taking the quiz! Here's how you scored. You answered " + score + " out of " + questions.length + " correctly! Care to try again?")
}
function restartQuiz() {
questions.forEach(q => q.alreadyAnswered = false);
$('.summary').hide();
$('.quiz').show();
score = 0;
currentQuestion = 0;
showQuestion();
}
function showProgress() {
$('#currentQuestion').html(currentQuestion + " out of " + questions.length);
}
function showIsCorrect(isCorrect) {
var result = "Wrong";
if (isCorrect) {
result = "Correct";
}
$('#isCorrect').html(result);
$('.navigate').show();
$('.submit').hide();
}
$('.navigate').click(function() {
currentQuestion++;
if (currentQuestion >= questions.length) {
showSummary();
} else {
showQuestion();
}
$('.navigate').hide();
$('.submit').show();
$('#isCorrect').html('');
})* {
padding: 0;
margin: 0;
box-sizing: border-box;
text-decoration: none;
text-align: center;
background-color: #837F73;
}
h1 {
font-family: 'Poor Story', cursive;
background-color: #950002;
padding: 60px;
color: #FFAB0D;
text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}
h2 {
font-family: 'Poor Story', cursive;
font-size: 30px;
padding: 60px;
background-color: #950002;
color: #FFAB0D;
text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}
p {
font-family: 'Poor Story', cursive;
background-color: #FFAB0D;
font-size: 20px;
font-weight: bold;
}
a {
border: 1px solid #222F5B;
padding: 10px;
background-color: #222F5B;
color: silver;
border-radius: 5px;
margin-top: 50px;
display: inline-block;
}
a:hover {
border: 1px solid #000000;
background-color: #000000;
color: #FCBF2B;
}
.quiz button {
cursor: pointer;
border: 1px solid;
display: inline-block;
width: 200px;
margin: 10px;
font-family: 'Poor Story', cursive;
font-size: 26px;
}
#currentQuestion {
color: #000000;
font-size: 18px;
font-family: 'Poor Story', cursive;
margin-top: 10px;
}
#isCorrect {
color: white;
font-family: 'Poor Story', cursive;
font-weight: bold;
font-size: 18px;
}
.quiz,
.summary {
display: none;
}
.quiz ul {
margin-top: 20px;
list-style: none;
padding: 0;
}
.selected {
background-color: #398C3F;
}
.wrong {
background-color: red;
}<html lang="en">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://fonts.googleapis.com/css?family=Poor+Story" rel="stylesheet">
<link href="style.css" rel="stylesheet" type="text/css" />
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Harry Potter Quiz</title>
</head>
<body>
<header role="banner">
<div class="start">
<h1>How Well Do You Know Harry Potter?</h1>
<a href="#">Start Quiz</a>
</div>
</header>
<main role="main">
<div class="quiz">
<h2>Question Title</h2>
<div>
<button>Choice</button>
<button>Choice</button>
<button>Choice</button>
<button>Choice</button>
</div>
<a class="submit" href="#">Submit Answer</a>
<a class="navigate" style="display:none;" href="#">Next Question</a>
<div id="currentQuestion"></div>
<footer role="contentinfo">
<div id="isCorrect"></div>
</footer>
</div>
</main>
<div class="summary">
<h2>Results</h2>
<p>Thank you for taking the quiz! Here's how you scored. You answered x out of y correctly! Care to try again?</p>
<a href="#">Retake Quiz</a>
</div>
<script src="index.js"></script>
<!--jQuery script when using JSBin-->
<!--<script src="https://code.jquery.com/jquery-3.1.0.js"></script>-->
</body>
</html>内容总结
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