Develop Reference

Making javascript check what radio form has been selected

I am trying to make a dog race.
Basically what I want is to check what radio the user checked,
compare it to a random number between 1 - 5 and see if he won.
My question is... How do I compare them?
This is my code so far.
function chooser(){
var theDogs = ["dog1","dog2","dog3","dog4","dog5"],
rand = theDogs[Math.floor(Math.random() * theDogs.length)];
document.getElementById("winner").innerHTML = rand;
if(pick == rand)
{document.getElementById("winner").innerHTML =("win!");}
else {
document.getElementById("winner").innerHTML =("loose");
}
}
HTML:
<form id="pick" action="rand">
<input type="radio" name="dog" id="dog1">Dog1<br>
<input type="radio" name="dog" id="dog2">Dog2<br>
<input type="radio" name="dog" id="dog3">Dog3<br>
<input type="radio" name="dog" id="dog4">Dog4<br>
<input type="radio" name="dog" id="dog5">Dog5<br>
</form>
<br>
<br>
<input type="submit" value="Gamble" onclick="chooser();">
<br>
<p id="winner"> </p>

A jQuery and Native JavaScript Approach. Take your pick.
$("#submitjq").click(function() {
var theDogs = ["dog1","dog2","dog3","dog4","dog5"],
rand = theDogs[Math.floor(Math.random() * theDogs.length)];
var pick = $("input[type=radio][name='dog']:checked").val();
if(pick == rand)
{
$("#winner").html("jQuery: Won!");
}
else {
$("#winner").html("jQuery: Lost!");
}
});
document.getElementById('submitjs').onclick = function () {
var theDogs = ["dog1","dog2","dog3","dog4","dog5"],
rand = theDogs[Math.floor(Math.random() * theDogs.length)];
var pick = document.pick.dog.value;
console.log(pick);
if(pick == rand)
{
document.getElementById("winner").innerHTML = "JavaScript: Won!" ;
}
else {
document.getElementById("winner").innerHTML = "JavaScript: Lost!" ;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="pick" name="pick" action="rand">
<input type="radio" name="dog" value="dog1">Dog1<br>
<input type="radio" name="dog" value="dog2">Dog2<br>
<input type="radio" name="dog" value="dog3">Dog3<br>
<input type="radio" name="dog" value="dog4">Dog4<br>
<input type="radio" name="dog" value="dog5">Dog5<br>
</form>
<br>
<br>
<input type="submit" id="submitjs" value="Gamble Native JavaScript" />
<input type="submit" id="submitjq" value="Gamble jQuery" />
<br>
<p id="winner"> </p>

You need to give each radio button a value, and then getElementsByName, iterating through to find the one that's checked. See similar thread...

PHP show textbox on radiobutton click

Hi I attaching a part of my code which should hide the textbox and when female is selected it should show it. But this is not working
$(document).ready(function() {
$('input[name="gender"]').click(function() {
var value = $(this).val();
if( $value == "male")
{
$('#address').hide();
}
else{
$('#address').show();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<style>
.error {color: #FF0000;}
</style>
Gender:
<input type="radio" name="gender" value="female">Female
<input type="radio" name="gender" value="male">Male
<div name="address" id="address">
<textarea name="address" id="address" rows="5" cols="40"></textarea>
</div>
<br><br>
Please help. Thanks

You set value variable but wrote $value in your comparison test.
Try this:
$(document).ready(function() {
$('input[name="gender"]').click(function()
{
var value = $(this).val();
if( value == "male")
{
$('#address').hide();
}
else{
$('#address').show();
}
});
});
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<style>
.error {color: #FF0000;}
</style>
Gender:
<input type="radio" name="gender" value="female">Female
<input type="radio" name="gender" value="male">Male
<div name="address" id="address">
<textarea name="address" id="address" rows="5" cols="40"></textarea>
</div>
<br><br>
Edit:
As pointed out by in comments, your snippet did not include the jquery library, so it could not work. Make sure it's present in your code. eg:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

Resetting a quiz with reset button

new to stack overflow here. My question is what I might have done wrong with this quiz reset button? I have it set so that if the reset button is clicked at the end of the quiz, the quiz should return to the first question. However, the button is doing nothing. I was thinking I may have variable scope issues but I tried to accommodate for that and I still can't get the reset button to work. Thanks in advance.
HTML:
<html>
<head>
<title>Hello...</title>
</head>
<body>
<h1 id="theTitle" class="highlight summer">BATMAN QUIZ!</h1>
<div id="mainContent">
<div id="question">
</div>
<div id="choices">
<input type="radio" name="choices" /><label id="choice1" class="radios"></label></br>
<input type="radio" name="choices" /><label id="choice2" class="radios"></label></br>
<input type="radio" name="choices" /><label id="choice3" class="radios"></label></br>
<input type="submit" id="submitButton" value="Submit" /></br>
<input type="submit" class="hidden" id="nextButton" value="Next Question" />
</div>
<div class="hidden" id="answer">
</div>
</div>
</body>
</html>
CSS:
.hidden{
display:none;
}
.visible{
display:inline;
}
JavaScript:
var questionArray = [
["What is Batman's first name?", "Bruce Wayne"],
["What city does Batman live in?", "Gotham"],
["What is Commisioner Gordon's daughter's name?", "Barbara"]
];
var choicesArray = [
["Bruce Wayne", "Clark Kent", "Charles Xavier"],
["Metropolis", "Starling City", "Gotham"],
["Helen", "Barbara", "Jean"]
]
i = 0;
theQuiz(i);
function theQuiz(i) {
if (i < questionArray.length) {
var score = 0;
document.querySelector("#question").textContent = questionArray[i][0];
document.querySelector("#answer").textContent = "The correct answer is: " + questionArray[i][1];
document.querySelector("#choice1").textContent = choicesArray[i][0];
document.querySelector("#choice2").textContent = choicesArray[i][1];
document.querySelector("#choice3").textContent = choicesArray[i][2];
var answer = document.querySelector("#answer");
var submitButton = document.querySelector("#submitButton")
submitButton.addEventListener("click", showAnswer, false);
var nextButton = document.querySelector("#nextButton")
nextButton.addEventListener("click", nextQuestion, false);
function showAnswer() {
answer.classList.add("visible");
nextButton.classList.add("visible");
};
function nextQuestion() {
answer.classList.remove("visible");
nextButton.classList.remove("visible");
i++;
theQuiz(i);
};
} else {
document.body.textContent = "Game Over!";
var restartButton = document.createElement("input")
restartButton.type = "submit";
restartButton.value = "Play Again!"
document.body.appendChild(restartButton);
i=0;
theQuiz(i);
restartButton.addEventListener("click", resetGame, true);
function resetGame() {
i = 0;
theQuiz(0);
};
}
};

If you want to refresh the whole page: location.reload();
If you want to reset just where you are at on the quiz:
Wrap the whole quiz in a <form> and add this <input type='reset'> that's it.
Added and changed the following:
Required
button#fullReset and EventListeneradded
#mainContent into a <form>
<input type='reset'>added
Recommended
#choices to a <fieldset>
#theTitle inside <legend>
#answer into a <input type='hidden'>
Specification
id on <label> are useless, follow this pattern:
<label for='rad1'>Radio 1</label>
<input id='rad1' name='rads'>
Either <br> or <br/> never </br>
SNIPPET
<html>
<head>
<title>Hello...</title>
</head>
<body>
<form id="mainContent">
<fieldset id="choices">
<legend>
<h1 id="theTitle" class="highlight summer">BATMAN QUIZ!</h1>
</legend>
<input type="radio" name="choices" />
<label id="choice1" class="radios"></label>
<br>
<input type="radio" name="choices" />
<label id="choice2" class="radios"></label>
<br>
<input type="radio" name="choices" />
<label id="choice3" class="radios"></label>
<br>
<input type="submit" id="submitButton" value="Submit" />
<br>
<input type="submit" class="hidden" id="nextButton" value="Next Question" />
<input type="hidden" id="answer">
<input type='reset'>
<button id='fullReset'>Full Reset</button>
</fieldset>
</form>
<script>
var fullReset = document.getElementById('fullReset');
fullReset.addEventListener('click', function(e) {
location.reload();
}, false);
</script>
</body>
</html>

Creating a multiple choice option in javascript

I have created an HTML multiple choice question. I am facing a problem how to validate it. Below is the HTML code:
<h1>JavaScript is ______ Language.</h1><br>
<form>
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
</form>
<button>Submit Answer</button>
When the user clicks the submit button, there should be an alert that will show a message based on what was selected.
If no option was selected, the alert box should say "please select choice answer".
If the "Scripting" option was selected, the alert box should say "Answer is correct !"
If an option different from "Scripting" is selected, the alert box should say "Answer is wrong".
I want to create this validation in JavaScript.

You have to use onclick attribute and more js
attach event hander to your button
get radio elements value
compare
var submitAnswer = function() {
var radios = document.getElementsByName('choice');
var val= "";
for (var i = 0, length = radios.length; i < length; i++) {
if (radios[i].checked) {
val = radios[i].value;
break;
}
}
if (val == "" ) {
alert('please select choice answer');
} else if ( val == "Scripting" ) {
alert('Answer is correct !');
} else {
alert('Answer is wrong');
}
};
<h1>JavaScript is ______ Language.</h1><br>
<form >
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
</form>
<button onclick="submitAnswer()">Submit Answer</button>

var submitAnswer = function() {
var radios = document.getElementsByName('choice');
var val= "";
for (var i = 0, length = radios.length; i < length; i++) {
if (radios[i].checked) {
val = radios[i].value;
break;
}
}
if (val == "" ) {
alert('please select choice answer');
} else if ( val == "Scripting" ) {
alert('Answer is correct !');
} else {
alert('Answer is wrong');
}
};
<h1>JavaScript is ______ Language.</h1><br>
<form >
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
</form>
<button onclick="submitAnswer()">Submit Answer</button>
Some changes
I made some changes to the code above to make it more 'abstract'
<h1>JavaScript is ______ Language.</h1><br>
<form id="d1">
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
</form>
<button onclick="submitAnswer(d1.choice.value, 'Scripting')">Submit Answer</button>
<script>
var submitAnswer = function(valore, rightanswer) {
if (valore == rightanswer) {
alert("OK");
}
};
</script>
Another, more complex example
<div style="background-color:lightblue">
<h1>JavaScript is a <span id='a1'>______</span> Language.</h1><br>
<form id="d1">
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
<br>
<input type="submit" value="submit" onclick="validate(choice.value, 'Scripting', 'd1','a1')">
</form>
</div>
<div style="background-color:lightblue">
<h1>Python is a <span id='a2'>______</span> Language.</h1><br>
<form id="d2">
<input type="radio" name="choice" value="Scripting"> Scripting
<input type="radio" name="choice" value="Wonderful"> Wonderful
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
<br>
<input type="submit" value="submit" onclick="validate(choice.value, 'Wonderful', 'd2', 'a2')">
</form>
</div>
<script>
var validate = function(valore, rightanswer, form, span) {
var formname = document.getElementById(form)
var spanname = document.getElementById(span)
spanname.innerHTML = rightanswer;
if (valore == rightanswer) {
formname.innerHTML ="<div style='background-color:lightgreen'><h1>GREAT! YOU'RE RIGHT: The answer, in fact, was: " + rightanswer + "</h1></div>";
}
else {
formname.innerHTML ="<div style='background-color:pink'><h1>Sorry, you where wrong: The answer was: " + rightanswer + "</h1></div>";
}
};
</script>

Use the required keyword. This prompts the user to choose a value, when the submit button is pressed without choosing any option. And always prefer to use
<input type="submit" value="submit"> over <button>Submit Answer</button>
while handling forms. Use the onclick() event handler to call your Javascript code.
<h1>JavaScript is ______ Language.</h1><br>
<form >
<input type="radio" name="choice" value="Scripting" required> Scripting
<input type="radio" name="choice" value="Programming"> Programming
<input type="radio" name="choice" value="Application"> Application
<input type="radio" name="choice" value="None of These"> None of These
<input type="submit" value="submit" onclick="validate()">
</form>
And the javascript part is as follows.
<script type="text/javascript">
function validate() {
var a= document.getElementByName("choice");
for (var i = 0, i < a.length; i++) {
if (a[i].checked) {
if( a[i].value == "scripting" )
alert("your answer is correct");
else
alert("your answer is not correct");
break;
} } }
</script>

Here condition is showing in alert pop up box. but I want to show it in a html tag.
But after clicking submit button, innerHTML content showing a millisecond and then automatic remove the content. How selection will stay in innerHTML
document.getElementById("answer").innerHTML;
var submitAnswer = function() {
var radios = document.getElementsByName('choice');
var val= "";
for (var i = 0, length = radios.length; i < length; i++) {
if (radios[i].checked) {
val = radios[i].value;
break;
}
}
if (val == "" ) {
document.getElementById("answer").innerHTML = "please select choice answer";
} else if ( val == "Scripting" ) {
document.getElementById("answer").innerHTML = "Answer is correct !"
} else {
document.getElementById("answer").innerHTML = "Answer is wrong"
}
};

You can add a function and event onClick so that whenever someone clicks on option submit button will appear.

How to fill textbox using radio button

I have a code with button Click. When i click text appears in textbox. It woks. But i have a problem to write anoter type of code. I want to fill the textbox using radio buttons but without button Click. So when I click in a radio I want to show text in textbox. Here is my code.
<script type="text/javascript">
function testResults (form) {
var TestVar1 = form.input[0].checked;
var TestVar2 = form.input[1].checked;
var TestVar3 = form.input[2].checked;
var TestVar4 = form.input[3].checked;
if (TestVar1 == true) {
form.textbox.value = "Earth is...";
} else if (TestVar2 == true){
form.textbox.value = "Mars is...";
} else if (TestVar3 == true){
form.textbox.value = "Jupiter is...";
} else if (TestVar4 == true){
form.textbox.value = "Saturn is...";
}
}
</script>
</head>
<body>
<center>
<h1>Our Universe</h1>
</center>
<form>
Select Planet<br />
<input type="radio" name="input" onclick='check_value(0)'/>Earth<p>
<input type="radio" name="input" onclick='check_value(1)'/>Mars<p>
<input type="radio" name="input" onclick='check_value(2)'/>Jupiter<p>
<input type="radio" name="input" onclick='check_value(3)'/>Saturn<p>
<input type="button" name="button" value="Click" onClick="testResults(this.form)"><p>
<textarea name="comments" id="textbox" rows="5" cols="50"></textarea>
</form>
</body>

To do that on clicking radio butttons a way could be this:
<input type="radio" name="input" onclick="check_value(this.value)" value="Earth" />Earth<p>
<input type="radio" name="input" onclick="check_value(this.value)" value="Mars"/>Mars<p>
<input type="radio" name="input" onclick="check_value(this.value)" value="Jupiter"/>Jupiter<p>
<input type="radio" name="input" onclick="check_value(this.value)" value="Saturn"/>Saturn<p>
and js:
function check_value(txt){
document.form.textbox.value = txt + " is...";
}

See if is this you want.
<script type="text/javascript">
function check_value (value,form) {
if (value == 0) {
form.textbox.value = "Earth is...";
} else if (value == 1){
form.textbox.value = "Mars is...";
} else if (value == 2){
form.textbox.value = "Jupiter is...";
} else if (value == 3){
form.textbox.value = "Saturn is...";
}
}
</script>
</head>
<body>
<center>
<h1>Our Universe</h1>
</center>
<form>
Select Planet<br />
<input type="radio" name="input" onclick='check_value(0,this.form)'/>Earth<p>
<input type="radio" name="input" onclick='check_value(1,this.form)'/>Mars<p>
<input type="radio" name="input" onclick='check_value(2,this.form)'/>Jupiter<p>
<input type="radio" name="input" onclick='check_value(3,this.form)'/>Saturn<p>
<input type="button" name="button" value="Click" onClick="testResults(this.form)"><p>
<textarea name="comments" id="textbox" rows="5" cols="50"></textarea>
</form>
</body>