How to get past second index on the array - javascript

I am trying to iterate through an image array, displaying each image individually and using a button to move onto the next. However, when the button is clicked it moves onto the next image, but after the second image, it does not move onto the 3rd etc Can anyone find where the loop is getting stuck?
function changeImage() {
var imageArray = ["/Users/rate/images/images/practice/sun1.jpg", "/Users/rate/images/images/practice/sun2.jpg", "/Users/rate/images/images/practice/sun3.jpg", "/Users/rate/images/images/practice/sun4.jpg"]
var currentImage = 0;
currentImage += 1;
if (currentImage >= imageArray.length) {
currentImage = 0;
}
document.getElementById("mainImage").src = imageArray[currentImage]
}
<!DOCTYPE html>
<html>
<head>
<title> App Icons? </title>
<link rel="stylesheet" type="text/css" href="/Users/Website/css/mainstyle.css">
<script type="text/javascript" src="/Users/rate/js/main.js"></script>
</head>
<body class="body">
<div>
<div>
<hr>
<div class=topbar>
<h1> Do you find this App Icon aesthically pleasing</h1>
</div>
<hr>
<div id=displayedImage> </div>
<img src="/Users/rate/images/images/practice/sun1.jpg" id="mainImage" />
<div id=answer>
<label> Strongly Agree </label>
<label><input type="radio" name="answer" value="1" required><span>1</span></label>
<label><input type="radio" name="answer" value="2" required><span>2</span></label>
<label><input type="radio" name="answer" value="3" required><span>3</span></label>
<label><input type="radio" name="answer" value="4" required><span>4</span></label>
<label><input type="radio" name="answer" value="5" required><span>5</span></label>
<label> Strongly disagree</label>
<hr>
</div>
<input type="button" onclick="changeImage()" value="I am complete">

First of all, scope. Your currentImage should be declared globally because otherwise it will always start at 0. Second, the index of the last element in an array is equal to the array length minus 1, so you need to check currentImage against imageArray.length - 1:
var currentImage = 0;
function changeImage() {
var imageArray = ["/Users/rate/images/images/practice/sun1.jpg", "/Users/rate/images/images/practice/sun2.jpg", "/Users/rate/images/images/practice/sun3.jpg", "/Users/rate/images/images/practice/sun4.jpg"]
if (currentImage >= imageArray.length - 1) {
currentImage = 0;
} else {
currentImage += 1;
}
document.getElementById("mainImage").src = imageArray[currentImage]
console.log(currentImage);
}
<div>
<div>
<hr>
<div class=topbar>
<h1> Do you find this App Icon aesthically pleasing</h1>
</div>
<hr>
<div id=displayedImage> </div>
<img src="/Users/rate/images/images/practice/sun1.jpg" id="mainImage" />
<div id=answer>
<label> Strongly Agree </label>
<label><input type="radio" name="answer" value="1" required><span>1</span></label>
<label><input type="radio" name="answer" value="2" required><span>2</span></label>
<label><input type="radio" name="answer" value="3" required><span>3</span></label>
<label><input type="radio" name="answer" value="4" required><span>4</span></label>
<label><input type="radio" name="answer" value="5" required><span>5</span></label>
<label> Strongly disagree</label>
<hr>
</div>
<input type="button" onclick="changeImage()" value="I am complete">

Related

My countdown timer is not working

I am attaching my .js as well as php file, no output is being displayed on the screen not even the __________ placed in the <p> tag ,the php file is only up to the <p> tag where the id for the .js file is attached.
js code:
var timeleft = 600;
var startTime = 0;
var currentTime = 0;
function convertSeconds(s) {
var min = floor(s / 60);
var sec = s % 60;
return nf(min, 2) + ':' + nf(sec, 2);
}
var ding;
function preload() {
ding = loadSound("ding.mp3");
}
function setup() {
noCanvas();
startTime = millis();
var params = getURLParams();
console.log(params);
if (params.minute) {
var min = params.minute;
timeleft = min * 60;
}
var timer = select('#timer');
timer.html(convertSeconds(timeleft - currentTime));
var interval = setInterval(timeIt, 1000);
function timeIt() {
currentTime = floor((millis() - startTime) / 1000);
timer.html(convertSeconds(timeleft - currentTime));
if (currentTime == timeleft) {
ding.play();
clearInterval(interval);
//counter = 0;
}
}
}
html code:
<html>
<head>
<title>online examination system</title>
<link rel="stylesheet" type="text/css" href="style.css">
<link rel="stylesheet" type="text/css" href="style2.css">
<meta charset="UTF-8">
<script language="javascript" type="text/javascript src=" libraries
/p5.js</script>
< script language = "javascript"
src = "libraries/p5.dom.js" ></script>
<script language="javascript" src="libraries/p5.sound.js"></script>
<script language="javascript" type="text/javascript" src="sketch.js"></script>
</head>
<body>
<div class=header>
<img class="img-style" src="Online-Examination-System-Banner.jpeg" width="1166px" height="250px">
</div>
<div class="top">
<ul id="navigation">
<li>HOME</li>
<li>ABOUT US</li>
<li>CONTACT US</li>
<li>EXAMINATION</li>
<li>LOGIN</li>
<li>LOGOUT</li>
</ul>
</div>
<p style="font-size:40;color:white;font-weight:bolder;">Welcome !</p>
<p id="timer" style="color:white;font-family:courier;font-size:28px; float:center;">______</p>
<form action="cplus.php" method="post" >
<div style="margin-top:10px;margin-right:85px;margin-left:100px;margin- bottom:20px;background:rgba(0,0,0,0.5)">
<p style="color:white;font-family:courier;font-size:18px">1. Which of the following correctly declares an array?</p> <br>
<input class="exam-btn" type="radio" name="q1" id="q1-a" value="A" checked>
<label for="q1-a" style="color:white;font-family:courier;font-size:18px">int array[10];</label>
<input class="exam-btn" type="radio" name="q1" id="q1-b" value="B">
<label style="color:white;font-family:courier;font-size:18px">int array;</label>
<input class="exam-btn" type="radio" name="q1" id="q1-c" value="C">
<label style="color:white;font-family:courier;font-size:18px">array{10};</label>
<input class="exam-btn" type="radio" name="q1" id="q1-d" value="D">
<label style="color:white;font-family:courier;font-size:18px">array array[10];</label>
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">2. What is the index number of the last element of an array with 9 elements?</p> <br>
<input class="exam-btn" type="radio" name="q2" id="q2-a" value="A">
<label style="color:white;font-family:courier;font-size:18px">9</label>
<input class="exam-btn" type="radio" name="q2" id="q2-b" value="B" checked>
<label style="color:white;font-family:courier;font-size:18px">8</label>
<input class="exam-btn" type="radio" name="q2" id="q2-c" value="C">
<label style="color:white;font-family:courier;font-size:18px">0</label>
<input class="exam-btn" type="radio" name="q2" id="q2-d" value="D">
<label style="color:white;font-family:courier;font-size:18px">programmer defined</label>
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">3. Which of the following accesses the seventh element stored in array?</p> <br>
<input class="exam-btn" type="radio" name="q3" id="q3-a" value="A" checked>
<label style="color:white;font-family:courier;font-size:18px">array[6];</label>
<input class="exam-btn" type="radio" name="q3" id="q3-b" value="B" >
<label style="color:white;font-family:courier;font-size:18px">array[7];</label>
<input class="exam-btn" type="radio" name="q3" id="q3-c" value="C" >
<label style="color:white;font-family:courier;font-size:18px">array(7);</label>
<input class="exam-btn" type="radio" name="q3" id="q3-d" value="D" >
<label style="color:white;font-family:courier;font-size:18px">array;</label>
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">4. Which of the following gives the memory address of the first element in array?</p> <br>
<input class="exam-btn" type="radio" name="q4" id="q4-a" value="A" >
<label style="color:white;font-family:courier;font-size:18px">array[0];</label>
<input class="exam-btn" type="radio" name="q4" id="q4-b" value="B" >
<label style="color:white;font-family:courier;font-size:18px">array[1];</label>
<input class="exam-btn" type="radio" name="q4" id="q4-c" value="C" >
<label style="color:white;font-family:courier;font-size:18px">array[2];</label>
<input class="exam-btn" type="radio" name="q4" id="q4-d" value="D" checked>
<label style="color:white;font-family:courier;font-size:18px">none</label>
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">5. What will be the output of this program?</p> <br>
<pre style="color:white;font-family:courier;font-size:18px">
#include <stdio.h>
using namespace std;
int array1[] = {1200, 200, 2300, 1230, 1543};
int array2[] = {12, 14, 16, 18, 20};
int temp, result = 0;
int main()
{
for (temp = 0; temp < 5; temp++)
{
result += array1[temp];
}
for (temp = 0; temp < 4; temp++)
{
result += array2[temp];
}
cout << result;
return 0;
}
</pre>
</pre>
<input class="exam-btn" type="radio" name="q5" id="q5-a" value="A" >
<label style="color:white;font-family:courier;font-size:18px">6553</label>
<input class="exam-btn" type="radio" name="q5" id="q5-b" value="B" checked>
<label style="color:white;font-family:courier;font-size:18px">6533</label>
<input class="exam-btn" type="radio" name="q5" id="q5-c" value="C" >
<label style="color:white;font-family:courier;font-size:18px">6522</label>
<input class="exam-btn" type="radio" name="q5" id="q5-d" value="D" >
<label style="color:white;font-family:courier;font-size:18px">12200</label>
<br><br><br><br>
<! 1. token 2. sensitive 3. identifiers
4. octal 5. \0n -->
<p style="color:white;font-family:courier;font-size:18px">6.The smallest individual unit in a program is known as a …………………… </p> <br>
<p style="color:white;font-family:courier;font-size:18px">ans</p><input class="exam-btn" type="text" name="" >
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">7.C++ Language is case …………………. </p> <br>
<p style="color:white;font-family:courier;font-size:18px">ans</p><input class="exam-btn" type="text" name="" >
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">8.An ………………… is a long sequence of letters and digits. </p> <br>
<p style="color:white;font-family:courier;font-size:18px">ans</p><input class="exam-btn" type="text" name="" >
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">9.A sequence of digits beginning with zero is considered to be …………….number. </p> <br>
<p style="color:white;font-family:courier;font-size:18px">ans</p><input class="exam-btn" type="text" name="" >
<br><br><br><br>
<p style="color:white;font-family:courier;font-size:18px">10.………………. escape sequence represents the given number in octal form. </p> <br>
<p style="color:white;font-family:courier;font-size:18px">ans</p>
<input class="exam-btn" type="text" name="" >
<br><br><br><br>
<input type="submit" value="Submit quiz">
</div>
<div style="font-size:18px;color:white;font-weight:bolder;">
<?php
$answer1;
$answer2;
$answer3;
$answer4;
$answer5;
$answer1 = $_POST['q1'];
$answer2 = $_POST['q2'];
$answer3 = $_POST['q3'];
$answer4 = $_POST['q4'];
$answer5 = $_POST['q5'];
$totalcorrect;
$totalcorrect = 0;
if($answer1 == "A") {$totalcorrect++;}
if($answer2 == "B") {$totalcorrect++;}
if($answer3 == "A") {$totalcorrect++;}
if($answer4 == "D") {$totalcorrect++;}
if($answer5 == "B") {$totalcorrect++;}
echo "total correct answers are".$totalcorrect;
?>
</div>
</div>
</form>
</body>
</html>

How Can I Cascade Radio Buttons In Javascript?

I'm new to programming and am tasked with creating a clickable tournament bracket. 8 teams, where you can pick the winners who will advance to the next round.
The problem I'm running into is when a person would want to revise picks in the first or second round after filling out the bracket.
For example in the first round the user picks:
Team1 v. Team8 --> #1 moves on
Team4 v. Team5 --> #4 moves on
Team3 v. Team6 --> #3 moves on
Team2 v. Team7 --> #2 moves on
In the Second Round let's say they pick:
Team1 v. Team4 --> #1 moves on
Team2 v. Team3 --> #2 moves on
In the Finals, they pick:
Team1 v. Team2 --> #1 wins.
Then, let's say the user changes their mind and picks Team8 to upset Team1 in the first round. Right now the code would still show Team1 as the winner and in the final game. How can I remove the text for the future rounds that currently shows Team1?
Attaching JSFiddle here: https://jsfiddle.net/a4hya2c7/5/ or see below code:
<!DOCTYPE html>
<html>
<head>
<title>Button</title>
</head>
<body>
<p>First Round</p>
<div id="round1">
<input type="radio" name="g1" id="i1" value="#1" onclick="changeText(this.value);"><label id="r1">#1</label>
<input type="radio" name="g1" id="i2" value="#8" onclick="changeText(this.value);"><label id="r2">#8</label></br>
<input type="radio" name="g2" id="i3" value="#4" onclick="changeText2(this.value);"><label id="r3">#4</label>
<input type="radio" name="g2" id="i4" value="#5" onclick="changeText2(this.value);"><label id="r4">#5</label></br>
<input type="radio" name="g3" id="i5" value="#3" onclick="changeText3(this.value);"><label id="r5">#3</label>
<input type="radio" name="g3" id="i6" value="#6" onclick="changeText3(this.value);"><label id="r6">#6</label></br>
<input type="radio" name="g4" id="i7" value="#7" onclick="changeText4(this.value);"><label id="r7">#7</label>
<input type="radio" name="g4" id="i8" value="#2" onclick="changeText4(this.value);"><label id="r8">#2</label></br>
</div>
</br>
<p>Second Round</p>
<div id="round2">
<input type="radio" name="g5" id="i9" onclick="changeText5(this.value);"><label id="r9"></label>
<input type="radio" name="g5" id="i10" onclick="changeText5(this.value);"><label id="r10"></label></br>
<input type="radio" name="g6" id="i11" onclick="changeText6(this.value);"><label id="r11"></label>
<input type="radio" name="g6" id="i12" onclick="changeText6(this.value);"><label id="r12"></label></br>
</div>
</br>
<p>Finals</p>
<div id="round3">
<input type="radio" name="g7" id="i13" onclick="changeText7(this.value);"><label id="r13"></label>
<input type="radio" name="g7" id="i14" onclick="changeText7(this.value);"><label id="r14"></label></br>
</div>
</br>
<p>Winner</p>
<div id="round4">
<label value="#8" id="r15"></label></br>
</div>
</br>
</body>
</html>
JS:
function changeText(value) {
document.getElementById('r9').innerHTML = value;
document.getElementById('i9').value = value;
}
function changeText2(value) {
document.getElementById('r10').innerHTML = value;
document.getElementById('i10').value = value;
}
function changeText3(value) {
document.getElementById('r11').innerHTML = value;
document.getElementById('i11').value = value;
}
function changeText4(value) {
document.getElementById('r12').innerHTML = value;
document.getElementById('i12').value = value;
}
function changeText5(value) {
document.getElementById('r13').innerHTML = value;
document.getElementById('i13').value = value;
}
function changeText6(value) {
document.getElementById('r14').innerHTML = value;
document.getElementById('i14').value = value;
}
function changeText7(value) {
document.getElementById('r15').innerHTML = value;
document.getElementById('r15').value = value;
}
Firstly your <br> tags aren't correct as you can see here:
</div>
</br>
You are using the close tag without the opening. You can either use:
<br/>
Or use the newer html5 self closing tags style:
<br>
As to the JS itself, you can simplify it a lot if you use an attribute, similar as the name you are already using to point where it must put the value. With that change the code would be a lot smaller and simpler:
const inputs = document.querySelectorAll("input[type=radio]");
for (let inp of inputs){
inp.addEventListener("change", function(){
let targetLabel = document.getElementById(inp.dataset.target);
targetLabel.previousSibling.value = inp.value;
targetLabel.innerHTML = inp.value;
});
}
<p>First Round</p>
<div id="round1">
<input type="radio" name="g1" id="i1" value="#1" data-target="r9"><label id="r1">#1</label>
<input type="radio" name="g1" id="i2" value="#8" data-target="r9"><label id="r2">#8</label><br>
<input type="radio" name="g2" id="i3" value="#4" data-target="r10"><label id="r3">#4</label>
<input type="radio" name="g2" id="i4" value="#5" data-target="r10"><label id="r4">#5</label><br>
<input type="radio" name="g3" id="i5" value="#3" data-target="r11"><label id="r5">#3</label>
<input type="radio" name="g3" id="i6" value="#6" data-target="r11"><label id="r6">#6</label><br>
<input type="radio" name="g4" id="i7" value="#7" data-target="r12"><label id="r7">#7</label>
<input type="radio" name="g4" id="i8" value="#2" data-target="r12"><label id="r8">#2</label><br>
</div>
<br>
<p>Second Round</p>
<div id="round2">
<input type="radio" name="g5" id="i9" data-target="r13"><label id="r9"></label>
<input type="radio" name="g5" id="i10" data-target="r13"><label id="r10"></label><br>
<input type="radio" name="g6" id="i11" data-target="r14"><label id="r11"></label>
<input type="radio" name="g6" id="i12" data-target="r14"><label id="r12"></label><br>
</div>
<br>
<p>Finals</p>
<div id="round3">
<input type="radio" name="g7" id="i13" data-target="r15"><label id="r13"></label>
<input type="radio" name="g7" id="i14" data-target="r15"><label id="r14"></label><br>
</div>
<br>
<p>Winner</p>
<div id="round4">
<label value="#8" id="r15"></label><br>
</div>
<br>
Note that the targets i set were directly to the labels:
<input type="radio" ... data-target="r9">
Then to get to the corresponding radio i used previousSibling.
I used several functions that you may not know:
querySelectorAll - to get an array of elements matching the selector passed
for ... of to iterate on all inputs retrieved by the querySelectorAll
addEventListener - to set the event handler directly on Javascript and make the code cleaner
And with just those little lines of Javascript you have the same functionality, and most importantly, without code duplication.
Now if you want to cascade a change on the first radios to the lower ones, you can call the change event directly with:
const event = new Event('change');
element.dispatchEvent(event);
Whenever you see that the target element already has a value set. This works like a recursive call:
const inputs = document.querySelectorAll("input[type=radio]");
for (let inp of inputs){
inp.addEventListener("change", function(){
let targetLabel = document.getElementById(inp.dataset.target);
let targetRadio = targetLabel.previousSibling;
targetRadio.value = inp.value;
targetLabel.innerHTML = inp.value;
//if this isn't the last and it's checked, to not cascade non selected radios
if (targetRadio.hasAttribute && targetRadio.checked){
const nextTargetLabel = document.getElementById(targetRadio.dataset.target);
if (nextTargetLabel.innerHTML != ''){ //if it has a value then cascade
targetRadio.dispatchEvent(new Event('change'));
}
}
});
}
<p>First Round</p>
<div id="round1">
<input type="radio" name="g1" id="i1" value="#1" data-target="r9"><label id="r1">#1</label>
<input type="radio" name="g1" id="i2" value="#8" data-target="r9"><label id="r2">#8</label><br>
<input type="radio" name="g2" id="i3" value="#4" data-target="r10"><label id="r3">#4</label>
<input type="radio" name="g2" id="i4" value="#5" data-target="r10"><label id="r4">#5</label><br>
<input type="radio" name="g3" id="i5" value="#3" data-target="r11"><label id="r5">#3</label>
<input type="radio" name="g3" id="i6" value="#6" data-target="r11"><label id="r6">#6</label><br>
<input type="radio" name="g4" id="i7" value="#7" data-target="r12"><label id="r7">#7</label>
<input type="radio" name="g4" id="i8" value="#2" data-target="r12"><label id="r8">#2</label><br>
</div>
<br>
<p>Second Round</p>
<div id="round2">
<input type="radio" name="g5" id="i9" data-target="r13"><label id="r9"></label>
<input type="radio" name="g5" id="i10" data-target="r13"><label id="r10"></label><br>
<input type="radio" name="g6" id="i11" data-target="r14"><label id="r11"></label>
<input type="radio" name="g6" id="i12" data-target="r14"><label id="r12"></label><br>
</div>
<br>
<p>Finals</p>
<div id="round3">
<input type="radio" name="g7" id="i13" data-target="r15"><label id="r13"></label>
<input type="radio" name="g7" id="i14" data-target="r15"><label id="r14"></label><br>
</div>
<br>
<p>Winner</p>
<div id="round4">
<label value="#8" id="r15"></label><br>
</div>
<br>
Edit:
To clear the following radios instead of cascading the values you can use a while, and navigating with the targets until you reach the end:
const inputs = document.querySelectorAll("input[type=radio]");
for (let inp of inputs){
inp.addEventListener("change", function(){
let targetLabel = document.getElementById(inp.dataset.target);
let targetRadio = targetLabel.previousSibling;
targetLabel.innerHTML = inp.value;
targetRadio.value = inp.value;
//while there is a next target clear it
while (targetLabel.previousSibling.hasAttribute){
targetLabel = document.getElementById(targetRadio.dataset.target);
targetRadio = targetLabel.previousSibling;
targetRadio.checked = false;
targetLabel.innerHTML = '';
}
});
}
<p>First Round</p>
<div id="round1">
<input type="radio" name="g1" id="i1" value="#1" data-target="r9"><label id="r1">#1</label>
<input type="radio" name="g1" id="i2" value="#8" data-target="r9"><label id="r2">#8</label><br>
<input type="radio" name="g2" id="i3" value="#4" data-target="r10"><label id="r3">#4</label>
<input type="radio" name="g2" id="i4" value="#5" data-target="r10"><label id="r4">#5</label><br>
<input type="radio" name="g3" id="i5" value="#3" data-target="r11"><label id="r5">#3</label>
<input type="radio" name="g3" id="i6" value="#6" data-target="r11"><label id="r6">#6</label><br>
<input type="radio" name="g4" id="i7" value="#7" data-target="r12"><label id="r7">#7</label>
<input type="radio" name="g4" id="i8" value="#2" data-target="r12"><label id="r8">#2</label><br>
</div>
<br>
<p>Second Round</p>
<div id="round2">
<input type="radio" name="g5" id="i9" data-target="r13"><label id="r9"></label>
<input type="radio" name="g5" id="i10" data-target="r13"><label id="r10"></label><br>
<input type="radio" name="g6" id="i11" data-target="r14"><label id="r11"></label>
<input type="radio" name="g6" id="i12" data-target="r14"><label id="r12"></label><br>
</div>
<br>
<p>Finals</p>
<div id="round3">
<input type="radio" name="g7" id="i13" data-target="r15"><label id="r13"></label>
<input type="radio" name="g7" id="i14" data-target="r15"><label id="r14"></label><br>
</div>
<br>
<p>Winner</p>
<div id="round4">
<label value="#8" id="r15"></label><br>
</div>
<br>

js radio buttons check

i am trying to add mutliple choice exam questions (like survey) to my site. For that i am using js and jquery. i added feature to make sure all group buttons have been checked. But the error is that I cannot resolve properly checking of selected ones. Js check only first if and if it is true then all questions have been answered true, if not then all answers are wrong.
here is my js code:
function doAjaxPost() {
var result = 4;
var rightAnswers = 0;
var allmarked = 0;
var response = "";
$('.answers').each(function() {
if ($(this).find('input[type="radio"]:checked').length > 0) {
allmarked = allmarked + 1;
} else {
alert("not all checked");
}
});
if (allmarked == result) {
allmarked = 0;
if ($("input[#name=7]:checked").val() == "right") {
rightAnswers = rightAnswers + 1;
}
if ($("input[#name=8]:checked").val() == "right") {
rightAnswers = rightAnswers + 1;
}
if ($("input[#name=9]:checked").val() == "right") {
rightAnswers = rightAnswers + 1;
}
if ($("input[#name=10]:checked").val() == "right") {
rightAnswers = rightAnswers + 1;
}
$('#info').html(rightAnswers + " / " + result);
}
}
here is my html:
<div class="clearfix single_content">
<div class="tom-right">
<h4 class="tom-right">1.4</h4>
<br />
<ul class="answers">
<input type="radio" name="9" value="1" id="9a" />
<label for="9a">1</label>
<br/>
<input type="radio" name="9" value="2" id="9b" />
<label for="9b">2</label>
<br/>
<input type="radio" name="9" value="3" id="9c" />
<label for="9c">3</label>
<br/>
<input type="radio" name="9" value="right" id="9d" />
<label for="9d">right</label>
<br/>
</ul>
</div>
</div>
<div class="clearfix single_content">
<div class="tom-right">
<h4 class="tom-right">1.5</h4>
<br />
<ul class="answers">
<input type="radio" name="10" value="1" id="10a" />
<label for="10a">1</label>
<br/>
<input type="radio" name="10" value="2" id="10b" />
<label for="10b">2</label>
<br/>
<input type="radio" name="10" value="3" id="10c" />
<label for="10c">3</label>
<br/>
<input type="radio" name="10" value="right" id="10d" />
<label for="10d">right</label>
<br/>
</ul>
</div>
</div>
i am stack to this point. it frankly seems stupid question but i am not spesialized in js. Thus, any assist would be appreciated
Because of this radio group selection, so you can only choose one; if you want to achieve that situation, you need to use checkbox to achieve;and the way to resolve ploblem is every options bind clickevent when clicking one of checkboxes,then the click func can achieve every option choosed
you can try this:
you can create an object with questions and related correct answers:
function doAjaxPost() {
var result = $('.answers').length;
var rightAnswers =0 ;
var response= "" ;
var error=false;
var correct_answers = [{question_number:1,answers_number:5},
{question_number:10,answers_number:2},
{question_number:9,answers_number:3}];
$('.answers').each(function(){
if($(this).find('input[type="radio"]:checked').length > 0){
var question_number=$(this).find('input[type="radio"]:checked').attr("name");
var answer_number =$(this).find('input[type="radio"]:checked').val();
$.each(correct_answers, function( index, value ) {
if(question_number==value.question_number && answer_number==value.answers_number)rightAnswers++;
});
}
else error=true;
});
if(error) alert("not all checked"); //display the error once
else $('#info').html(rightAnswers + " / " + result);
}
$('#check_values').click(function(){
doAjaxPost();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div class="clearfix single_content">
<div class="tom-right">
<h4 class="tom-right">1.4</h4> <br />
<ul class="answers">
<input type="radio" name="9" value="1" id="9a" />
<label for="9a">1</label><br/>
<input type="radio" name="9" value="2" id="9b" />
<label for="9b">2</label><br/>
<input type="radio" name="9" value="3" id="9c" />
<label for="9c">3</label><br/>
<input type="radio" name="9" value="4" id="9d" />
<label for="9d">4</label><br/>
</ul>
</div>
</div>
<div class="clearfix single_content">
<div class="tom-right">
<h4 class="tom-right">1.5</h4> <br />
<ul class="answers">
<input type="radio" name="10" value="1" id="10a" />
<label for="10a">1</label><br/>
<input type="radio" name="10" value="2" id="10b" />
<label for="10b">2</label><br/>
<input type="radio" name="10" value="3" id="10c" />
<label for="10c">3</label><br/>
<input type="radio" name="10" value="4" id="10d" />
<label for="10d">4</label><br/>
</ul>
</div>
</div>
<input type="button" id="check_values" value="Check"/>
<p id="info"></p>

JavaScript quiz answer check up

I'm trying to make a score base quiz where it shows how much score you get when finished e.g. out of 8 and the answers you got incorrect. I have the score system out of the way, just not the validation
HTML
<div class="quiz">
1) What noise does a dog make?</div>
<div class="values">
<input type="radio" value="0" id="q1" name="q1" onclick="question('jq1',this.value)">a) Cluck<br>
<input type="radio" value="0" id="q1" name="q1" onclick="question('jq1',this.value)">b) Meow<br>
<input type="radio" value="0" id="q1" name="q1" onclick="question('jq1',this.value)">c) Moo<br>
<input type="radio" value="1" id="q1" name="q1" onclick="question('jq1',this.value)">d) Woof</div><br>
<input type="hidden" name="jq1" id="jq1" />
<div class="quiz">
2) What noise does a cat make?</div>
<div class="values">
<input type="radio" value="1" id="q2" name="q2" onclick="question('jq2',this.value)">a) Meow<br>
<input type="radio" value="0" id="q2" name="q2" onclick="question('jq2',this.value)">b) Cluck<br>
<input type="radio" value="0" id="q2" name="q2" onclick="question('jq2',this.value)">c) Woof<br>
<input type="radio" value="0" id="q2" name="q2" onclick="question('jq2',this.value)">d) Moo</div><br>
<input type="hidden" name="jq2" id="jq2" />
(sorry for inappropriate questions, they're just there as placeholders :D)
JavaScript
function question(ref,val) {
var x = document.getElementById(ref);
x.value = val;
}
function result() {
var score = 0;
var x = document.getElementById('jq1');
score = eval (score) + eval(x.value);
var x = document.getElementById('jq2');
score = eval (score) + eval(x.value);
alert("You scored: "+score +" out of 2!");
}
I'd like a new line underneath the current one in the alert box saying "Questions 1, 2, 3 were incorrect". Just very unsure on how to do this and would like someone's help.
Thanks very much!
A more object oriented answer
DEMO: http://jsfiddle.net/Victornpb/3cwzndp8/1/
var q = [
{
question:"What noise does a dog make?",
options:["Meow", "Cluck","Woof","Moo"],
answers: [0,0,1,0]
},
{
question:"What noise does a cat make?",
options:["Meow", "Cluck","Woof","Moo"],
answers: [1,0,0,0]
}
];
var questionary = generateQuestionary(q);
quizBody.appendChild(questionary);
function generateQuestionary(obj){
var questionary = tag("div",{className:"questionary"});
for(var i=0; i<obj.length; i++){
questionary.appendChild(generateQuestionHtml(obj[i], i));
}
return questionary;
}
function generateQuestionHtml(obj, n){
var answers = tag("div",{className:"answers"});
for(var i=0; i<obj.options.length; i++){
answers.appendChild(
tag("label",{},
tag("input",{type:"radio", name:"q"+n, value:obj.answers[i],onclick:ck} ),
tag("span",{}, obj.options[i]),
tag("br")
)
);
}
return tag("div",{className:"quiz"},
tag("div",{className:"question"}, obj.question),
answers,
tag("div",{className:"info"})
);
}
function ck(e){
console.log(this);
var infoBox = this.parentElement.parentElement.parentElement.getElementsByClassName("info")[0];
if(this.value==1){
infoBox.innerHTML = "Correct!";
infoBox.classList.remove("wrong");
}
else{
infoBox.innerHTML = "Incorrect answer :(";
infoBox.classList.add("wrong");
}
}
I used a utility function to generate the DOM Elements (the tag() function)
https://gist.github.com/victornpb/11201998
Assuming you want a rudimentary, client-side system, I would suggest declaring an object that holds the answers when the page loads, with the name of each group of choices as the key, and the correct answers being the values.
Say that question 1, labeled "q1", has 3 choices, the answer being the first.
var answers = {q1:0, q2:3};
//The key "q1" gets the value 0, while "q2" will get 3 (or any arbitrary value you want)
Now you can say
if(answers["q1"] != document.forms["formNameHere"].elements["q1"].value)
alert("Everything is awful, you got question one wrong");
You can iterate through each question, checking if the answer is correct, and assembling a string of the wrong answers, which you can display through your alert on a new line.
It's not clear what you want to accomplish.
eval is totally unnecessary here, and shouldn't be used.
window.onload = function() {
check.onclick = result;
}
function result() {
var score = 0;
score += parseInt(getSelectedRadioValue("q1")) || 0;
score += parseInt(getSelectedRadioValue("q2")) || 0;
alert("You scored: " + score + " out of 2!");
}
function getSelectedRadioValue(name) {
var radios = document.getElementsByName(name);
for (var i = 0; i < radios.length; i++) {
if (radios[i].checked) {
return radios[i].value;
}
}
}
<div class="quiz">
1) What noise does a dog make?</div>
<div class="answers">
<label>
<input type="radio" value="0" name="q1">a) Meow</label>
<br>
<label>
<input type="radio" value="0" name="q1">b) Cluck</label>
<br>
<label>
<input type="radio" value="1" name="q1">c) Woof</label>
<br>
<label>
<input type="radio" value="0" name="q1">d) Moo</label>
<br>
</div>
<br>
<input type="hidden" name="jq1" id="jq1" />
<div class="quiz">
2) What noise does a cat make?</div>
<div class="answers">
<label>
<input type="radio" value="1" name="q2">a) Meow</label>
<br>
<label>
<input type="radio" value="0" name="q2">b) Cluck</label>
<br>
<label>
<input type="radio" value="0" name="q2">c) Woof</label>
<br>
<label>
<input type="radio" value="0" name="q2">d) Moo</label>
<br>
</div>
<br>
<input type="hidden" name="jq2" id="jq2" />
<input type="button" id="check" value="I'm done">
Demo:
https://quiz-using-javascript.web.app/
Source Code:
https://github.com/mhsunny/JavaScript-Quiz
This is the project to build a quiz using JavaScript. You can find how to check the answer of questions using javascript forEach() and using setInterval and clearInteval method.
app.js
app.js
const correctAnswers = ['B', 'B', 'B', 'B'];
const form = document.querySelector('.quiz-form');
const result = document.querySelector('.result');
form.addEventListener('submit', e =>{
e.preventDefault();
let score = 0;
const userAnswer = [form.q1.value, form.q2.value, form.q3.value, form.q4.value]
//check answers
userAnswer.forEach((answer, index) =>{
if(answer === correctAnswers[index]){
score +=25;
}
// console.log(score);
//show result on page
});
scrollTo(0, 0);
result.classList.remove('d-none');
let output = 0;
const timer = setInterval(()=>{
result.querySelector('span').textContent = `${output}%`;
if(output === score){
clearInterval(timer);
}else{
output++;
}
}, 10)
})
// let i = 0;
// const timer = setInterval(()=>{
// console.log("hello")
// i++;
// if(i == 5){
// clearInterval(timer);
// }
// }, 1000)
index.html
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title> JavaScript Quiz</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
</head>
<body>
<!-- top section -->
<div class="intro py-3 bg-white text-center">
<div class="container">
<h2 class="text-primary display-3 my-4"> Quiz using Javascript</h2>
</div>
</div>
<!-- result section -->
<div class="result py-4 d-none bg-light text-center">
<div class="container lead">
<p>You are <span class="text-primary display-4 p-3">0%</span> ninja</p>
</div>
</div>
<!-- quiz section -->
<div class="quiz py-4 bg-primary">
<div class="container">
<h2 class="my-5 text-white">On with the questions...</h2>
<form class="quiz-form text-light">
<div class="my-5">
<p class="lead font-weight-normal">1. How do you give a ninja directions?</p>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q1" value="A" checked>
<label class="form-check-label">Show them a map</label>
</div>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q1" value="B">
<label class="form-check-label">Don't worry, the ninja will find you</label>
</div>
</div>
<div class="my-5">
<p class="lead font-weight-normal">2. If a ninja has 3 apples, then gives one to Mario & one to Yoshi, how many apples does the ninja have left?</p>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q2" value="A" checked>
<label class="form-check-label">1 apple</label>
</div>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q2" value="B">
<label class="form-check-label">3 apples, and two corpses</label>
</div>
</div>
<div class="my-5">
<p class="lead font-weight-normal">3. How do you know when you've met a ninja?</p>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q3" value="A" checked>
<label class="form-check-label">You'll recognize the outfit</label>
</div>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q3" value="B">
<label class="form-check-label">The grim reaper will tell you</label>
</div>
</div>
<div class="my-5">
<p class="lead font-weight-normal">4. What's a ninja's favourite array method?</p>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q4" value="A" checked>
<label class="form-check-label">forEach()</label>
</div>
<div class="form-check my-2 text-white-50">
<input type="radio" name="q4" value="B">
<label class="form-check-label">slice()</label>
</div>
</div>
<div class="text-center">
<input type="submit" class="btn btn-light">
</div>
</form>
</div>
</div>
<script src="app.js"></script>
</body>
</html>

JavaScript - How to show the next div and hide the previous one?

I am creating a simple quiz and would like to know how to show one question at a time but only using JavaScript. I do not know jQuery. Essentially, I would like the first question to be shown automatically.
Here is an example of what my HTML looks like:
<div id="q0">
<li>
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</li>
</div>
<div id="q1" style="visibility:hidden">
<li>
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</li>
</div>
<div id="q2" style="visibility:hidden">
<li>
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</li>
</div>
I currently don't have script for showing next div and hiding the previous one because I don't know how to even start.
I'm looking to have it put into this form...
function nextQ(){
// code
}
... and for it to be called by this button:
<button onclick="next()">Next Question</button>
I am really new to HTML and JavaScript and would appreciate any help.
Thanks.
Pure JavaScript version (config):
var showing = [1, 0, 0];
var questions = ['q0', 'q1', 'q2'];
function next() {
var qElems = [];
for (var i = 0; i < questions.length; i++) {
qElems.push(document.getElementById(questions[i]));
}
for (var i = 0; i < showing.length; i++) {
if (showing[i] == 1) {
qElems[i].style.display = 'none';
showing[i] = 0;
if (i == showing.length - 1) {
qElems[0].style.display = 'block';
showing[0] = 1;
} else {
qElems[i + 1].style.display = 'block';
showing[i + 1] = 1;
}
break;
}
}
}
<div id="questions">
<div id="q0">
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</div>
<div id="q1" style="display: none">
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</div>
<div id="q2" style="display: none">
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</div>
</div>
<button onclick="next()">Next Question</button>
Pure JavaScript version (no config):
function next() {
var qElems = document.querySelectorAll('#questions>div');
for (var i = 0; i < qElems.length; i++) {
if (qElems[i].style.display != 'none') {
qElems[i].style.display = 'none';
if (i == qElems.length - 1) {
qElems[0].style.display = 'block';
} else {
qElems[i + 1].style.display = 'block';
}
break;
}
}
}
<div id="questions">
<div id="q0">
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</div>
<div id="q1" style="display: none;">
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</div>
<div id="q2" style="display: none;">
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</div>
</div>
<button onclick="next()">Next Question</button>
jQuery version:
$(function() {
$('.next').on('click', function() {
$('#questions>div').each(function() {
var id = $(this).index();
if ($(this).is(':visible')) {
$(this).hide();
if (id == $('#questions>div').length - 1) {
$('#questions>div').eq(0).show();
} else {
$('#questions>div').eq(id + 1).show();
}
return false;
}
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="questions">
<div id="q0">
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</div>
<div id="q1" style="display: none">
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</div>
<div id="q2" style="display: none">
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</div>
</div>
<button class="next">Next Question</button>
Though I agree with #Bitwise on using jQuery instead on javascript alone to ensure cross-browser compatibility. But since you insist on using javascript, here's what you should do.
1) Ensure that your <li>'s are enclosed in a container tag first (say, <ul>) so you iterate only through desired list.
2) use display:none property instead of visibility:hidden. visibility:hidden simply hides an element, but it will still take up the same space as before. display:none hides an element, and it will not take up any space.
Here's the updated code.
HTML:
<ul id="listContainer">
<div id="q0">
<li style="display:list-item">
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A"/>Green<br/>
<input type="radio" name="question0" value="B"/>Blue<br/>
<input type="radio" name="question0" value="C"/>Red<br/>
<input type="radio" name="question0" value="D"/>Purple<br/>
</li>
</div>
<div id="q1" >
<li style="display:none">
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A"/>Water<br/>
<input type="radio" name="question1" value="B"/>Cement<br/>
<input type="radio" name="question1" value="C"/>Trees<br/>
<input type="radio" name="question1" value="D"/>The Sky<br/>
</li>
</div>
<div id="q2" >
<li style="display:none">
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A"/>24<br/>
<input type="radio" name="question2" value="B"/>22<br/>
<input type="radio" name="question2" value="C"/>16<br/>
<input type="radio" name="question2" value="D"/>48<br/>
</li>
</div>
</ul>
<button id="next">next</button>
Javascript:
document.getElementById('next').addEventListener("click",function(){
var listContainer = document.getElementById("listContainer");
var listItem = listContainer.getElementsByTagName("li");
for (var i=0; i < listItem.length-1; i++)
{
if(listItem[i].style.display == "list-item")
{
listItem[i].style.display = "none";
listItem[i+1].style.display = "list-item";
break;
}
}
});
Here's the fiddle.
Cheers!
I would twist the code a little. Add question class to every div which acts as question i.e .question { display:none }. Add active class to first question (i.e. .active{display:block}, it shows the first question. Look for all divs with question class and add them to a variable, with every next button pressed,remove active class from current question add active class to next div with class question using classList.add and classList.remove of Javascript until last question is reached. Count keeps the current question's number.
I've done it in the codepen http://codepen.io/dwanirdesh/pen/EaQOPg
Or code directly from below:
<div id="q0" class="question active">
<li>
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</li>
</div>
<div id="q1" class="question" >
<li>
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</li>
</div>
<div id="q2" class="question">
<li>
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</li>
</div>
<button onclick="next()">Next Question</button>
## CSS ##
.question{
display:none
}
.active{
display:block
}
## JAVASCRIPT ##
var questionNumber=0;
var questions=document.querySelectorAll('.question');
function next(){
questionNumber++;
if(questions.length>questionNumber)
{
document.querySelector('.active').classList.remove('active');
questions[questionNumber].classList.add('active');
}
}
Here is the java script function code. For this to work, you need to make sure that the div display property to be set as or in the html code. Also you need to name the id of the button to be "next" so that it can be hidden on reaching the last button.
function nextQ(){
var blockFound = 0;
var lastQuestion = 0;
var divs = document.getElementsByTagName("div");
for(var i = 0; i < divs.length; i++){
if ( blockFound == 1){
blockFound = 0;
divs[i].style.display = 'block';
}else if ( divs[i].style.display == 'block' ){
if ( i + 2 == divs.length){
lastQuestion = 1;
}
blockFound = 1;
divs[i].style.display = 'none';
}
}
if ( lastQuestion == 1){
document.getElementById('next').style.visibility = 'hidden';
}
}
Html code here.
<div id="q0" style="display:block">
<li>
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</li>
</div>
<div id="q1" style="display:none">
<li>
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</li>
</div>
<div id="q2" style="display:none">
<li>
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</li>
</div>
<button id="next" onclick="nextQ()">Next Question</button>
Is it what you need?
<div id="q0">
<li>
<h3>1. The color of the sky is... </h3>
<input type="radio" name="question0" value="A">Green<br>
<input type="radio" name="question0" value="B">Blue<br>
<input type="radio" name="question0" value="C">Red<br>
<input type="radio" name="question0" value="D">Purple<br>
</li>
<button class="next" onclick="goNext(0)">Next Question</button>
</div>
<div id="q1" style="display:none">
<li>
<h3>2. Paper comes from... </h3>
<input type="radio" name="question1" value="A">Water<br>
<input type="radio" name="question1" value="B">Cement<br>
<input type="radio" name="question1" value="C">Trees<br>
<input type="radio" name="question1" value="D">The Sky<br>
</li>
<button class="next" onclick="goNext(1)">Next Question</button>
</div>
<div id="q2" style="display:none">
<li>
<h3>3. How many hours in a day? </h3>
<input type="radio" name="question2" value="A">24<br>
<input type="radio" name="question2" value="B">22<br>
<input type="radio" name="question2" value="C">16<br>
<input type="radio" name="question2" value="D">48<br>
</li>
<button class="next" onclick="goNext(2)">Next Question</button>
</div>
<script language=javascript>
function goNext(i)
{
document.getElementById("q"+i).style.display = 'none';
i++;
document.getElementById("q"+i).style.display = 'block';
}
</script>

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