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How to calculate discount for price and clear form when radio button is changed

1) I am trying to calculate discount for price with this code but it does not work.
2) I want to clear form when the radio button is changed. Example the size is M and fill number in quantity input only If I change the size, the form will be clear or after amount show me If I change size, the form will be clear too.
window.addEventListener("load", () => {
document.getElementById('calculate').addEventListener('click', total)
});
var total = function () {
var s = Number(document.querySelector('input[name=size]:checked').value);
var q = Number(document.getElementById('qty').value);
var m = document.querySelector('input[name=member]:checked').value;
var result;
if(s && q && m) {
if(q >= 1) {
if(s == 'S') {
result = s * q;
} else if(s == 'M') {
result = s * q;
} else if(s == 'L') {
result = s * q;
} else {
result = s * q;
}
result -= m === "YES" ? result*5/100 : 0;
} else {
result = " ";
}
} else {
result = " ";
}
document.getElementById('amount').innerHTML = result.toFixed(2);
}
const clearForm = () => {
document.getElementById('myForm').reset();
}
<form id="myForm">
<div>
<p>Size:
<input type="radio" name="size" id="S" value="249">S
<input type="radio" name="size" id="M" value="269">M
<input type="radio" name="size" id="L" value="309">L
<input type="radio" name="size" id="XL" value="319">XL
</p>
</div>
<p>Quantity:
<input type="text" name="qty" id="qty">
</p>
<p>Member:
<input type="radio" name="member" value="YES">YES
<input type="radio" name="member" value="NO">NO
</p>
<p>Amount: $
<input type="text" name="amount" id="amount" readonly>
</p>
<button type="button" id="calculate">Calculate</button>
<button type="button" id="clear" onclick="clearForm()">Reset</button>
</form>

Your calculations are working as expected.
You have one problem in your Code:
document.getElementById('amount').innerHTML = result.toFixed(2); //Here with innerHTML
inputs cannot contain html. They can only contain a value. The property innerHTML is not ideal for input elements. What you are looking for is:
document.getElementById('amount').value = result.toFixed(2);
You must set the value of your amount, not innerHTML.
I have just edited your Snipped. Notice the changes I made on your code. A lot of stuff were unnecessary. Like your multiple if statements checking for 'S', 'M' ... Because at the end they all lead to the same calculation expression.
window.addEventListener("load", () => {
// clear then textboxes on Size change
document.querySelectorAll("input[name=size]").forEach(input=>{
input.addEventListener('change', ()=>{
clearTextBoxes();
});
});
});
var computeTotal = () =>
{
var s = document.querySelector('input[name=size]:checked').value;
var q = document.getElementById('qty').value;
var m = document.querySelector('input[name=member]:checked').value;
var result; //initialize to empty string
if(s && q && m && q >= 1) {
result = s * q;
result -= m === "YES" ? result*5/100 : 0;
}
// Change innerHTML to value
document.getElementById('amount').value = result == undefined ? " " : result.toFixed(2);
}
var clearTextBoxes = () => {
document.getElementById("qty").value = "";
document.getElementById("amount").value = "";
}
const clearForm = () => {
document.getElementById('myForm').reset();
}
<form id="myForm">
<p>Member:
<input type="radio" name="member" value="YES">YES
<input type="radio" name="member" value="NO">NO
</p>
<div>
<p>Size:
<input type="radio" name="size" id="S" value="249">S
<input type="radio" name="size" id="M" value="269">M
<input type="radio" name="size" id="L" value="309">L
<input type="radio" name="size" id="XL" value="319">XL
</p>
</div>
<p>Quantity:
<input type="number" name="qty" id="qty">
</p>
<p>Amount: $
<input type="text" name="amount" id="amount" readonly>
</p>
<button type="button" id="calculate" onclick="computeTotal()">Calculate</button>
<button type="button" id="clear" onclick="clearForm()">Reset</button>
</form>

You need to clear the input fields when radio button changes. Find the working demo below
window.addEventListener("load", () => {
document.getElementById('calculate').addEventListener('click', total)
});
var total = function() {
var s = Number(document.querySelector('input[name=size]:checked').value);
var q = Number(document.getElementById('qty').value);
var m = document.querySelector('input[name=member]:checked').value;
var result;
if (s && q && m) {
if (q >= 1) {
if (s == 'S') {
result = s * q;
} else if (s == 'M') {
result = s * q;
} else if (s == 'L') {
result = s * q;
} else {
result = s * q;
}
result -= m === "YES" ? result * 5 / 100 : 0;
} else {
result = " ";
}
} else {
result = " ";
}
document.getElementById('amount').value = result.toFixed(2);
}
const clearForm = () => {
document.getElementById('myForm').reset();
}
// Add event listener to all radio items and add the clearfields logic
var memberRadios = document.querySelectorAll('input[type=radio][name="member"]');
var sizeRadios = document.querySelectorAll('input[type=radio][name="size"]');
Array.prototype.forEach.call(memberRadios, function(radio) {
radio.addEventListener('change', clearFields);
});
Array.prototype.forEach.call(sizeRadios, function(radio) {
radio.addEventListener('change', clearFields);
});
function clearFields(event) {
document.getElementById('qty').value = null;
document.getElementById('amount').value = null;
}
<form id="myForm">
<p>Member:
<input type="radio" name="member" value="YES">YES
<input type="radio" name="member" value="NO">NO
</p>
<div>
<p>Size:
<input type="radio" name="size" id="S" value="249">S
<input type="radio" name="size" id="M" value="269">M
<input type="radio" name="size" id="L" value="309">L
<input type="radio" name="size" id="XL" value="319">XL
</p>
</div>
<p>Quantity:
<input type="text" name="qty" id="qty">
</p>
<p>Amount: $
<input type="text" name="amount" id="amount" readonly>
</p>
<button type="button" id="calculate">Calculate</button>
<button type="button" id="clear" onclick="clearForm()">Reset</button>
</form>

Action attribute not working on JS validated form

The files are in the the correct locations, both the form page and form complete page are in the same folder. When I click submit, it validates the form correctly, but if everything is entered correctly and validates, it does nothing, just takes away the asterisks like it's supposed to in the js. I want it to link to the form_complete.html page after you hit submit and the validation runs, but after it validates nothing happens,
The html:
<form id="contactform" action="form_complete.html" method="post">
<p class = "labelp">
<label for="name">Name: </label>
<input type="text" name="name" id="name" placeholder="Enter your name" >
<span>*</span><br><br>
</p>
<p class = "labelp">
<label for="age">Age: </label>
<input type="text" min="18" max="100" name="age" id="age" placeholder="Enter your age">
<!-- using type=text so I can practice isNaN in js -->
<span>*</span><br><br>
</p>
<p class = "labelp"></p>
<label for="country">Country: </label>
<select name="country" id="country">
<option value ="">Select a country</option>
<option>USA</option>
<option>Canada</option>
<option>Mexico</option>
<option>Brazil</option>
<option>Japan</option>
<option>China</option>
<option>Other</option>
</select>
<span>*</span><br><br>
</p>
<p class = "labelp">
<label for="email">E-mail: </label>
<input type="email" name="email" id="email" placeholder="Enter your E-mail">
<span>*</span><br><br>
</p>
<p class = "labelp">
<label for="bday">Birthday: </label>
<input type="date" name="bday" id="bday">
<span>*</span><br><br>
</p>
<p class = "labelp">
<label for="gender" id="gender">Gender: </label>
<input type="radio" name="gender" value="male" id="male"> Male
<input type="radio" name="gender" value="female" id="female"> Female
<input type="radio" name="gender" value="other" id="other"> Other
<br><br>
</p>
<label>Comments: </label>
<textarea rows="5" cols="30"> </textarea><br><br>
<input type="button" id="registerbtn" value="Submit">
<input type="button" id="resetbtn" value="Reset">
</form>
The javascript:
"use strict";
var $ = function(id) { return document.getElementById(id);};
var processEntries = function(){
var isValid = true;
// values
var name = $("name").value;
var age = $("age").value;
var country = $("country").value;
var email = $("email").value;
var bday = $("bday").value;
var gender = "";
if ($("male").checked){gender = "Male";}
if ($("female").checked){gender = "Female";}
if ($("other").checked){gender = "Other";}
console.log(gender); //check if gender buttons work
// name
if(name == ""){
$("name").nextElementSibling.firstChild.nodeValue = "This field is required!";
isValid = false;}
else{
$("name").nextElementSibling.firstChild.nodeValue = "";
}
// age
if(age == ""){
$("age").nextElementSibling.firstChild.nodeValue = "This field is required!";
isValid = false;
}
else if(isNaN(age)){
$("age").nextElementSibling.firstChild.nodeValue = "This field must be a number!";
isValid = false;
}
else{
$("age").nextElementSibling.firstChild.nodeValue = "";
}
//country
if(country == ""){
$("country").nextElementSibling.firstChild.nodeValue = "Please select a country!";
isValid = false;}
else{
$("country").nextElementSibling.firstChild.nodeValue = "";
}
//email
if(email == ""){
$("email").nextElementSibling.firstChild.nodeValue = "This field is required!";
isValid = false;}
else{
$("email").nextElementSibling.firstChild.nodeValue = "";
}
//birthday
if(bday == ""){
$("bday").nextElementSibling.firstChild.nodeValue = "This field is required!";
isValid = false;}
else{
$("bday").nextElementSibling.firstChild.nodeValue = "";
}
}
var resetForm = function(){
$("contactform").reset();
$("name").nextElementSibling.firstChild.nodeValue = "*";
$("age").nextElementSibling.firstChild.nodeValue = "*";
$("country").nextElementSibling.firstChild.nodeValue = "*";
$("email").nextElementSibling.firstChild.nodeValue = "*";
$("bday").nextElementSibling.firstChild.nodeValue = "*";
}
window.onload = function() {
$("registerbtn").onclick = processEntries;
$("resetbtn").onclick = resetForm;
$("name").focus();
}

Please put below condition at the end of "processEntries" function
if(isValid){
$("#contactform").submit();
}

Simple js calculator with radio tag

I found subjects like mine but I could not fix my problem. So I wanted to calculate the cost of tickets form radio tags by multiplying the price with the amount of tickets using if statements for each option without jquery. I can not figure it out why I do not have an output. It looks like none of my functions work and I can not find why.
Can you help me please, I know it is easy but I am still a beginner
<!doctype html>
<html>
<head>
<title>No Boundaries</title>
<link rel="stylesheet" href="styles1.css">
<script type="text/javascript">
function validate(){
if(!document.form1.cond.checked)
{alert("Please accept the Terms and Conditions");
return false;
}
if(document.form1.name.value.length < 2)
{alert(“Please enter your full name, not just an initial”);
return false;
}
return true;
}
function cost() {
if (document.form1.accom["v"].checked) {
var amount = parseInt(document.form1.amount.value);
var ans = 90 * amount;
document.form1.total1.value = ans;
}
else if (document.form1.accom["t"].checked) {
var amount = parseInt(document.form1.amount.value);
var ans = 150 * amount;
document.form1.total1.value = ans;
}
else if (document.form1.accom["c"].checked) {
var amount = parseInt(document.form1.amount.value);
var ans = 45 * amount;
document.form1.total1.value = ans;
}
}
function post(){
if(document.form1.del["1"].checked){
var num = 0;
var ans = num;
document.form1.total2.value = ans;
}
if(document.form1.del["2"].checked){
var num = 12;
var ans = num;
document.form1.total2.value = ans;
}
if(document.form1.del["3"].checked){
var num = 16;
var ans = num;
document.form1.total2.value = ans;
}
if(document.form1.del["4"].checked){
var num = 20;
var ans = num;
document.form1.total2.value = ans;
}
}
function damage(){
var total1 = parseInt(document.form1.total1.value);
var total1 = parseInt(document.form1.total1.value);
var ans = total1 + total2;
document.form.total3.value = ans;
}
</script>
</head>
<body>
<section>
<form name="form1">
<fieldset>
<legend>Personal details</legend>
<div>
Please enter your full name<br>
<input name="name" type="text" required onsubmit="return validate();"><br>
</div>
<div>
Address<br>
<input name="addresss" type="text" required><br>
<input type="text"><br>
<input type="text"><br>
<input type="text"><br>
</div>
<div>
Phone Number<br>
<input name="phone" type="tel"><br>
</div>
<div>
Email Address<br>
<input name="email" type="email" required><br>
</div>
<div>
Date of Birth<br>
<input name="birth" type="date"><br>
</div>
</fieldset>
<fieldset>
<legend>Ticket Details</legend>
<div>
Type of T<br>
<label for="vil">V</label>
<input type="radio" name="accom[]" value="v">
<label for="town">T</label>
<input type="radio" name="accom[]" value="t">
<label for="con">C</label>
<input type="radio" name="accom[]" value="c">
</div>
<div>
Quantity of T
<input name="amount" type="number" min="1" max="10" required><br>
<br>
<input type="button" name="cost" value="C C" onclick="cost();"><br>
</div>
<div>
Delivery Options<br>
<input type="radio" name="del[]" value="1" >Free<br>
<input type="radio" name="del[]" value="2" >£12<br>
<input type="radio" name="del[]" value="3" >£16<br>
<input type="radio" name="del[]" value="4" >£20<br>
<br>
<input type="button" value="C D" onclick="post();"><br>
</div>
</fieldset>
<fieldset>
<legend>Terms And Conditions</legend>
<input name="cond" type="checkbox" onsubmit="return validate();">
</fieldset>
<fieldset>
<legend>Cost</legend>
<input type="text" name="total1" readonly><br>
<input type="text" name="total2" readonly><br>
<input type="text" name="total3" readonly><br>
<br>
<input type="button" value="C F C" onclick="damage();"><br>
</fieldset>
<br><br>
<fieldset>
<input type="submit">
</fieldset>
</form>
</section>
</body>
</html>

the cost function should be something like this,
function cost() {
if (document.form1.accom.value.toLowerCase() == "v") {
var amount = parseInt(document.form1.amount.value);
var ans = 90 * amount;
document.form1.total1.value = ans;
} else if (document.form1.accom.value.toLowerCase() == "t") {
var amount = parseInt(document.form1.amount.value);
var ans = 150 * amount;
document.form1.total1.value = ans;
} else if (document.form1.accom.value.toLowerCase() == "c") {
var amount = parseInt(document.form1.amount.value);
var ans = 45 * amount;
document.form1.total1.value = ans;
}
}
And to make the code more refactored, make it like this,
function cost() {
var val = document.form1.accom.value.toLowerCase();
var amount = parseInt(document.form1.amount.value);
var ans;
if (val == "v") {
ans = 90 * amount;
} else if (val == "t") {
ans = 150 * amount;
} else if (val == "c") {
ans = 45 * amount;
}
document.form1.total1.value = ans;
}

Ok I found your errors. This is the code for html
<div>
Type of T<br>
<label for="vil">V</label>
<input type="radio" name="accom" value="v">
<label for="town">T</label>
<input type="radio" name="accom" value="t">
<label for="con">C</label>
</div>
<div>
Quantity of T
<input name="amount" type="number" min="1" max="10" required><br>
<br>
<input type="button" name="cost" value="C C" onclick="costs();"><br>
</div>
Next, in your javascript you have tho change the name of function; instead of cost you have to renaming in costs
function costs() {
if (document.form1.accom.value == 'v') {
var amount = parseInt(document.form1.amount.value);
var ans = 90 * amount;
document.form1.total1.value = ans;
}
else if (document.form1.accom.value == 't') {
var amount = parseInt(document.form1.amount.value);
var ans = 150 * amount;
document.form1.total1.value = ans;
}
else if (document.form1.a`enter code here`ccom.value == 'c') {
var amount = parseInt(document.form1.amount.value);
var ans = 45 * amount;
document.form1.total1.value = ans;
}
}
That's all

javascript: submit button pulls all values from the textboxes and displays them in a p tag

So what I am trying to do here is when the submit button is clicked pull all of the values from the textboxes and display them in a p tag that I have on my html page. I have been tring to figure this out for days. Can somebody let me know what I am doing wrong?
/* JavaScript */
$("#submit").click(function(){
var doc = $("#doctorate").val()
var Name = $("#first_name").val();
var Last = $("#last_name").val();
var T = Doc + " "+ Name + " " + Last
break
var Certs = $("#certs").val()
break
var Title = $("#title").val()
break
var Department = $("#department").val()
break
var Numb = $("#number").val()
break
var Web = $("#website").val()
break
var Ema = $("#email").val()
document.getElementById('output').innerHTML = T;
})
HTML unchanged

The big problem I see is that you keep assigning the same thing to your output. Try something like this (reduced for brevity):
function myOut() {
var output = document.getElementById("certs").value;
output = output + document.getElementById("title").value;
if (certs != null) {
document.getElementById("output").innerHTML = output;
}
}
<input type="text" id="certs" />
<input type="text" id="title" />
<p id="output"></p>
<button onclick="myOut()">
Sub
</button>

Here you can try this one.
var role = document.getElementById("role").value;
var first_name = document.getElementById("first_name").value;
var last_name = document.getElementById("last_name").value;
var doctorate = document.getElementById("doctorate").value;
var certs = document.getElementById("certs").value;
var title = document.getElementById("title").value;
var department = document.getElementById("department").value;
var number = document.getElementById("number").value;
var website = document.getElementById("website").value;
var email = document.getElementById("email").value;
var output = document.getElementById("output").value;
$("#submit").click(function(){
var N = $("#first_name").val();
var L = $("#last_name").val();
var T = N + " " + L;
if (doctorate.checked) {
document.getElementById('output').innerHTML = T;
}
if (first_name != null) {
document.getElementById('output').innerHTML = T;
}
if (last_name != null) {
document.getElementById('output').innerHTML = T;
}
if (certs != null) {
document.getElementById('output').innerHTML = T;
}
if (title != null) {
document.getElementById('output').innerHTML = T;
}
if (department != null) {
document.getElementById('output').innerHTML = T;
}
if (number != null) {
document.getElementById('output').innerHTML = T;
}
if (website != null) {
document.getElementById('output').innerHTML = T;
}
if (email != null) {
document.getElementById('output').innerHTML = T;
}
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<fieldset id="role">
<legend>My Role</legend>
<label for="faculty">
<input type="radio" name="role" id="faculty" value="faculty" />
Faculty
</label>
<label for="staff">
<input type="radio" name="role" id="staff" value="staff" />
Staff
</label>
</fieldset>
<fieldset id="userinformation">
<legend>User Information</legend>
<label for="doctorate">
Doctorate?
<input type ="checkbox" id="doctorate" value="" />
</label>
<label>
First Name:
<input type="text" name="name" id="first_name" required />
</label>
<label>
Last Name:
<input type="text" name="name" id="last_name" required />
</label>
<label>
Certifications:
<input type="text" name="cert" id="certs" />
</label>
<label>
Title:
<input type="text" name="title" id="title" required />
</label>
<label>
Department:
<select id="department" required>
<option disabled selected value>-Select a Department-</option>
<option>School of Information Technology</option>
<option>Mathematics</option>
<option>English</option>
<option>History</option>
<option>Natural Sciences</option>
<option>Psychology</option>
<option>School of Health Sciences</option>
</select>
</label>
<label>
Primary Phone #:
<input type="tel" name="number" id="number" placeholder="444-123-1234" pattern="^\d{3}-\d{3}-\d{4}$"/>
</label>
<label>
Email:
<input type="email" name="email" id="email" placeholder="JDoe#example.com" required />
<span id="err3"></span>
</label>
<label>
Website:
<input type="text" name="website" id="website" placeholder="http//:www.example" pattern="https?://.+" />
</label>
</fieldset>
<fieldset id = "results">
<p id="output"></p>
</fieldset>
<fieldset id="submit_button">
<input type="button" id="submit" value="submit" />
</fieldset>

Javascript form verification for this

I need to do a Javascript verification of the fields. I need to know how to make for each span of every label how to make it display the write message.
At the moment the html code is:
<form method="post" id="contactForm" onclick="return main();">
<fieldset>
<div class="subscribe">
<label for="firstName">First name:</label>
<input type="text" name="firstName" id="firstName"/>
<span id="fnameMessage" class="infomessage">
Your first name should contain at least 2 alpha characters.
</span>
</div>
<div class="subscribe">
<label for="lastName">Last name:</label>
<input type="text" name="lastName" id="lastName"/>
<span id="lnameMessage" class="infomessage">
Your last name should contain at least 2 alpha characters.
</span>
</div>
<div class="subscribe">
<label for="title">Title:</label>
<select name="title" id="title">
<option value="1"> Mr. </option>
<option value="2"> Ms. </option>
<option value="3"> Mrs. </option>
<option value="4"> Miss. </option>
<option value="5"> Master. </option>
</select>
</div>
<div class="subscribe">
<label for="hNumber">Health Authority Number:</label>
<input type="text" name="number" id="hNumber"/>
<span id="hanMessage" class="infomessage">
Your ZHA number should be in the form of 6 digit integer prefixed wit the letters ZHA.
</span>
</div>
<div class="subscribe">
<label for="email">Email address: </label>
<input type="email" name="email" id="email"/>
<span id="emailMessage" class="infomessage">
Your email address should be as example: example#difexample.com.
</span>
</div>
<div class="subscribe">
<label for="phoneNumber">Telephone number:</label>
<input type="text" name="phoneNumber" id="phoneNumber"/>
<span id="phoneMessage" class="infomessage">
Your phone number should contain 11 numeric characters.
</span>
</div>
<div class="button">
<input id="btn1" type="submit" value="Submit" />
</div>
</fieldsed>
</form>
The javascript code that I've done it's:
function main() {
document.getElementById("contactForm").onsubmit = validateAll,
document.getElementById("firstName").onblur = validateName,
document.getElementById("lastName").onblur = validateName,
document.getElementById("phoneNumber").onblur = validatePhone;
}
function validateName() {
var test1 = fieldEmpty(this);
var test2 = fieldLength(this,2,50);
var test3 = fieldCharacters(this, "A");
var result = test1&&test2&&test3;
return result;
}
function validatePhone() {
var test1 = fieldEmpty(this);
var test2 = fieldLength(this,11,11);
var test3 = fieldCharacters(this,"N");
var result = test1&&test2&&test3;
return result;
}
function fieldEmpty(id) {
var valid = true;
if (id.value == "") {
valid = false;
alert("Field Empty");
}
return valid;
}
function fieldLength(id,min,max) {
var valid = true;
var lng = id.value.length;
if (lng < min || lng > max) {
valid = false;
alert("Field Length");
}
return valid;
}
function fieldCharacters(id,character) {
var letters = /[a-zA-Z]/;
var numbers = /[0-9]/;
var patternTest;
var valid = true;
if(character == "N") {
patternTest = numbers;
}
else if(character == "A") {
patternTest = letters;
}
valid = patternTest.test(id.value);
if (!valid) {
alert("Pattern Fail");
}
return valid;
}
function validateField() {
var noErrors = true;
// var input = document.getElementById(this);
if(this.value.length<2) {
noErrors = false;
alert("You need to input more than 1 character in " + this.id);
}
if(noErrors==false) {
var temp = document.getElementById(this.id + "firstnamemessage");
temp.className = "infomessage";
}
}
function validateAll() {
return false;
}
window.onload = main();