Using JS to show HTML output of calculation - javascript

I am trying to build a calorie calculator using HTML and JS and am currently struggling to show the output on screen (or via console.log). I know I'm doing something very basic quite wrong but can't currently pinpoint what that is.
Here's both my HTML and JS code below:
document.getElementById("bmrForm").addEventListener("submit", calcBMR);
function calcBMR(gender, weightKG, heightCM, age) {
// Calculate BMR
if (gender = 'male') {
let BMR = 10 * weightKG + 6.25 * heightCM - 5 * age + 5;
} else {
let BMR = 10 * weightKG + 6.25 * heightCM - 5 * age - 161;
}
console.log(BMR);
}
<body>
<script src="./script.js"></script>
<section>
<form id="bmrForm" onsubmit="calcBMR()">
<input type="text" id="gender" placeholder="Male or female?">
<input type="number" id="weight" placeholder="Weight in KG">
<input type="number" id="height" placeholder="Height in CM">
<input type="number" id="age" placeholder="How old are you?">
<button type="submit" id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>
</body>

Several things need to be modified in order to achieve your desired result.
The line document.getElementById("bmrForm").addEventListener("submit", calcBMR); is not needed because we can pass in a function directly to the onsubmit attribute of the form element.
The gender, weightKG, heightCM, and age parameters are not automatically passed in to the calcBMR function. The values need to be retrieved from the document.
The BMR variable needs to be defined above the if/else block because of scoping.
A return statement needs to be added to the onsubmit attribute so that the form does not submit and refresh the page. Alternatively, if the desired effect is to update the text on the screen, a button element with a click event handler added to it may be a better option that a form with a submit handler.
Strings are compared using == or === in JavaScript. Therefore, the gender = 'male' part needs to be changed to gender === 'male'.
In order to update the output, the element's textContent can be changed with document.getElementById("output").textContent = BMR.
Below is the code with the changes listed above.
function calcBMR() {
let gender = document.getElementById("gender").value;
let weightKG = document.getElementById("weight").value;
let heightCM = document.getElementById("height").value;
let age = document.getElementById("age").value;
let BMR;
// Calculate BMR
if (gender === 'male') {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age + 5;
} else {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age - 161;
}
console.log(BMR);
document.getElementById("output").textContent = BMR;
return false;
}
<body>
<script src="./script.js"></script>
<section>
<form id="bmrForm" onsubmit="return calcBMR()">
<input type="text" id="gender" placeholder="Male or female?">
<input type="number" id="weight" placeholder="Weight in KG">
<input type="number" id="height" placeholder="Height in CM">
<input type="number" id="age" placeholder="How old are you?">
<button type="submit" id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>

First, you are using a button with a type="submit", which is used to submit form data to a resource that will receive it and process it. In this case, you probably just want a button with type="button" that will only do what you've configured it to do (show the results on the screen).
After making that change, you should populate a pre-existing, but empty element with the result.
But you do have an issue with how and where you are declaring BMR. The let declaration should be outside of the if/then code but inside the function so it has scope throughout the function.
Also, your button's id is incorrect in the event handler setup.
Next, any value that you get from an HTML element will be a string and if you intend to do math with that value, you'll need to convert it to a JavaScript number. There are several ways to do this, but one shorthand way is to prepend the value with a + as you'll see I've done below.
Also, if someone were to type Male into the gender textbox, your code would not process it as a male because your code only checks for male, not Male. By forcing the input to lower case, your code will work (provided they spell male correctly). Preferably, you'd use a set of radio buttons or a drop down list for the user to choose from.
And, in conjunction with that, JavaScript uses = for assigning a value, not comparison. For loose equality (automatic type conversion) use == and for strict equality (no type conversion), use ===.
let out = document.getElementById("output");
let gender = document.getElementById("gender");
let height = document.getElementById("height");
let weight = document.getElementById("weight");
let age = document.getElementById("age");
// If you want to pass arguments to the event handler, you need to wrap the handler call in another function
document.getElementById("submitBtn").addEventListener("click", function(){calcBMR(gender.value.toLowerCase(), +weight.value, +height.value, +age.value)});
function calcBMR(gender, weightKG, heightCM, age) {
let BMR = null; // Declare the variable in the function scope
console.log(gender, weightKG, heightCM, age);
// Calculate BMR
if (gender === 'male') {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age + 5;
} else {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age - 161;
}
console.log(BMR);
output.textContent = BMR;
}
<body>
<script src="./script.js"></script>
<section>
<form id="bmrForm" onsubmit="calcBMR()">
<input type="text" id="gender" placeholder="Male or female?">
<input type="number" id="weight" placeholder="Weight in KG">
<input type="number" id="height" placeholder="Height in CM">
<input type="number" id="age" placeholder="How old are you?">
<button type="button" id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>
</body>

Working Codepen
There are a few fundamental flaws in your code. Having said that, studying this will really give you a proper understanding of Javascript.
HTML:
<body>
<section>
<form id="bmrForm">
<input type="text" id="gender" placeholder="Male or female?" name="gender">
<input type="number" id="weight" placeholder="Weight in KG" name="weight">
<input type="number" id="height" placeholder="Height in CM" name="height">
<input type="number" id="age" placeholder="How old are you?" name="age">
<button type="submit" id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>
</body>
Javascript:
document.getElementById("bmrForm").addEventListener("submit", calcBMR);
const output = document.querySelector('#output')
function calcBMR(e) {
e.preventDefault();
output.innerText = ''
const formData = new FormData(e.target)
const { age, gender, height, weight} = Object.fromEntries(formData);
let BMR = 0
// Calculate BMR
if (gender === 'male') {
BMR = 10 * parseInt(weight) + 6.25 * parseInt(height) - 5 * parseInt(age) + 5;
} else {
BMR = 10 * parseInt(weight) + 6.25 * parseInt(height) - 5 * parseInt(age) - 161;
}
output.innerText = BMR
}

You can remove the line document.getElementById("bmrForm").addEventListener("submit", calcBMR);
You can pass event to onsubmit - <form id="bmrForm" onsubmit="calcBMR(event)">
function calcBMR(e) {
e.preventDefault();
var elements = document.getElementById("bmrForm").elements; // logic to get all form elements
var obj ={};
for(var i = 0 ; i < elements.length ; i++){
var item = elements.item(i);
obj[item.id] = item.value;
}
const {gender, weight, height, age } = obj; //Get values from obj
// Calculate BMR
let BMR = '';
if (gender === 'male') {
BMR = 10 * weight + 6.25 * height - 5 * age + 5;
} else {
BMR = 10 * weight + 6.25 * height - 5 * age - 161;
}
console.log(BMR);
}

The BMR is in the if tree, it must be in parent.
Try this!
document.getElementById("bmrForm").addEventListener("submit", calcBMR);
const output = document.getElementById('output');
function calcBMR(event) {
// Get the [gender, weightKG, heightCM, age] value
let gender = document.getElementById('gender').value;
let weightKG = document.getElementById('weight').value;
let heightCM = document.getElementById('height').value;
let age = document.getElementById('age').value;
// Set default BMR to 0
let BMR = 0;
// Calculate BMR
if (gender = 'male') {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age + 5;
} else {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age - 161;
}
console.log(BMR);
output.innerText = BMR;
// Cancel form submit
event.preventDefault();
return;
}
<body>
<script src="./script.js"></script>
<section>
<form id="bmrForm">
<input type="text" id="gender" placeholder="Male or female?">
<input type="number" id="weight" placeholder="Weight in KG">
<input type="number" id="height" placeholder="Height in CM">
<input type="number" id="age" placeholder="How old are you?">
<button type="submit" id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>
</body>

I used a selector instead of the text field for the gender.
I used form.elements to get the values from the form.
I used event.preventDefault(); to prevent the form from redirecting on submit.
// your form
var form = document.getElementById("formId");
var DoMagic = function(event)
{
event.preventDefault();
var elements = form.elements;
if (elements["gender"].value == "male")
{
var result = 10 * elements["weight"].value + 6.25 * elements["height"].value - 5 * elements["age"].value + 5;
}
else
{
var result = 10 * elements["weight"].value + 6.25 * elements["height"].value - 5 * elements["age"].value - 161;
}
document.getElementById("result").textContent = "Result: " + result;
}
// attach event listener
form.addEventListener("submit", DoMagic, true);
<form id = "formId">
<label>Gender</label>
<select name="gender">
<option value="male">Male</option>
<option value="female">Female</option>
</select>
<br>
<label>Weight (kg)</label>
<input name="weight" type="number">
<br>
<label>Height (cm)</label>
<input name="height" type="number">
<br>
<label>Age (years)</label>
<input name="age" type="number">
<br>
<input type="submit" value="Do Magic!">
</form>
<span id='result'> </span>

Try this one, you are almost done, just by getting value from the input when user clicks the button.
But I have to notice you that submit button will immediately redirect to a new page, you should use click instead if you want to show yourself result.
document.getElementById("submitBtn").addEventListener("click",function(){
let gen = document.querySelector('#gender').value
let weight = document.querySelector('#weight').value
let height = document.querySelector('#height').value
let ages = document.querySelector('#age').value
calcBMR(gen,weight,height,ages)
})
function calcBMR(gender, weightKG, heightCM, age) {
let BMR
// Calculate BMR
if (gender = 'male') {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age + 5;
} else {
BMR = 10 * weightKG + 6.25 * heightCM - 5 * age - 161;
}
document.querySelector('#output').textContent = BMR;
}
<body>
<script src="./script.js"></script>
<section>
<form id="bmrForm">
<input type="text" id="gender" placeholder="Male or female?">
<input type="number" id="weight" placeholder="Weight in KG">
<input type="number" id="height" placeholder="Height in CM">
<input type="number" id="age" placeholder="How old are you?">
<button id="submitBtn">Do Magic!</button>
</form>
<p id="output">0</p>
</section>
</body>

Related

adding the sum of two separate functions

(ETA: I'm working on this for a class and the teacher wants everything to be "oninput"...yes, it's annoying :p )
I'm working on a form where each function miltiplies a number and gives me a "subtotal" on input. I'd like to take the two "subtotal" answers from the two functions and add them togething into a "total" amount. I feel like this should be simple but nothing I've tried works.
Here's what I've got in the javascript that works to give me the two subtotals:
function myCalculator() {
var qty1 = document.getElementById('qty1').value;
document.getElementById('subTotalOne').innerHTML = '$ ' + qty1 * 19.99;
}
function myCalculatorTwo() {
var qty2 = document.getElementById('qty2').value;
document.getElementById('subTotalTwo').innerHTML = '$ ' + qty2 * 37.99;
}
Here's the important parts of the html:
<div class="qty">
<label for="qty">Qty</label><br>
<input type="number" id="qty1" placeholder="0" oninput="myCalculator()"/><br>
<input type="number" id="qty2" placeholder="0" oninput="myCalculatorTwo()"/><br>
</div>
<div class="price">
<label for="price">Price</label>
<p>$19.99</p>
<p>$37.99</p>
</div>
<div class="subtotal">
<label for="subTotal">Total</label><br>
<span class="subTotalOne" id="subTotalOne">$</span><br>
<span class="subTotalTwo" id="subTotalTwo">$</span><br>
</div>
<div class="total">
<label for="total">Order Total</label><br>
<span class="orderTotal" id="orderTotal" oninput="orderTotal()">$</span><br>
</div>
I'm trying to add the subTotalOne and subTotalTwo and have them output at orderTotal, essentially. :)
Thanks!
//Global variables (concidering ID is unique)
let subTotalOne, subTotalTwo, qty1, qty2, orderTotal;
const setup = () => {
subTotalOne = document.getElementById('subTotalOne');
subTotalTwo = document.getElementById('subTotalTwo');
qty1 = document.getElementById('qty1');
qty2 = document.getElementById('qty2');
orderTotal = document.getElementById('orderTotal');
myCalculator();
myCalculatorTwo();
};
const updateTotal = (target, value) => {
if(target == null || value == null || Number.isNaN(value)) return;
target.textContent = `$ ${value.toFixed(2)}`;
target.setAttribute('data-value', value.toFixed(2));
}
const getTotal = () => {
if(subTotalOne == null || subTotalTwo == null) return 0;
const [value1, value2] = [
Number.parseFloat((subTotalOne.dataset?.value ?? 0), 10),
Number.parseFloat((subTotalTwo.dataset?.value ?? 0), 10)
];
if(Number.isNaN(value1) || Number.isNaN(value2)) return;
else return value1 + value2;
};
const updateOrderTotal = () => updateTotal(orderTotal, getTotal());
const myCalculator = () => {
const value = Number.parseFloat(qty1.value || 0, 10) * 19.99;
updateTotal(subTotalOne, value);
updateOrderTotal();
}
const myCalculatorTwo = () => {
const value = Number.parseFloat(qty2.value || 0, 10) * 37.99;
updateTotal(subTotalTwo, value);
updateOrderTotal();
}
window.addEventListener('load', setup);
<div class="qty">
<label for="qty">Qty</label><br>
<input type="number" id="qty1" placeholder="0" oninput="myCalculator()" min="0"><br>
<input type="number" id="qty2" placeholder="0" oninput="myCalculatorTwo()" min="0"><br>
</div>
<div class="price">
<label for="price">Price</label>
<p data-value="19.99">$19.99</p>
<p data-value="37.99">$37.99</p>
</div>
<div class="subtotal">
<label for="subTotal">Total</label><br>
<span class="subTotalOne" id="subTotalOne">$</span><br>
<span class="subTotalTwo" id="subTotalTwo">$</span><br>
</div>
<div class="total">
<label for="total">Order Total</label><br>
<span class="orderTotal" id="orderTotal" oninput="orderTotal()">$</span><br>
</div>
Here's how you do it:
function orderTotal() {
const qty1 = document.getElementById('qty1').value;
const qty2 = document.getElementById('qty2').value;
const total = parseInt(qty1) + parseInt(qty2);
document.getElementById('orderTotal').innerHTML = '$ ' + total;
}
Remove the oninput="orderTotal()" in your span element and trigger the above function using a button click e.g. <button onClick="orderTotal()">Calculate Total</button> or maybe when either of your two inputs' value changes. Also consider using const and let instead of var.
https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/
Instead of querying the DOM in Ray's answer--as DOM queries should generally be avoided since they are slow W3 Wiki, you could also consider using a shared variable between the two functions.
Also, consider using something else in place of innerHTML, mostly because of efficiency why-is-element-innerhtml-bad-code.
var total1;
var total2;
function myCalculator() {
var qty1 = document.getElementById('qty1').value;
total1 = qty1 * 19.99
document.getElementById('subTotalOne').textContent = '$ ' + total1;
}
function myCalculatorTwo() {
var qty2 = document.getElementById('qty2').value;
total2 = qty2 * 37.99;
document.getElementById('subTotalTwo').textContent = '$ ' + total2;
}
function orderTotal() {
document.getElementById('orderTotal').innerHTML = '$ ' + (total1 + total2);
//parentheses because '$' isn't a number so the numbers total1 and total2 will be treated like strings and joined together
}

Confusion with Javascript variable scoping

I'm trying to create a simple test in JS. I have a function that creates 4 radio-buttons and add them to the html. When I call it n times, I just add the same 4 radio buttons to the div and when I try to select one answer from the 4th question for example it still selects the answer from the first div/question.
function getRandom(min, max) {
return Math.random() * (max - min) + min;
}
function test_2() {
var a = getRandom(0, 10) - 5;
while (a == 0)
a = getRandom(0, 10) - 5;
var b = getRandom(0, 10) - 5;
//create the div in which i add the radio buttons
var div = document.createElement('div');
div.setAttribute('class', 'parent');
div.setAttribute('id', '2');
document.body.appendChild(div);
//create the radio button and set its attributes
var radio1 = document.createElement('input');
var label1 = document.createElement('label');
label1.innerHTML = a * 4 + b;
label1.setAttribute('for', 'radio1');
radio1.setAttribute('type', 'radio');
radio1.setAttribute('value', a * 4 + b);
radio1.setAttribute('id', 'radio1');
radio1.setAttribute('name', 'answ');
radio1.innerHTML = a * 4 + b;
//add it to the div
div.appendChild(radio1);
div.appendChild(label1);
}
test_2();
The name attribute must be different for each question:
<form>
<!-- Question 01 -->
<fieldset id="group1">
<input type="radio" value="" name="group1">
<input type="radio" value="" name="group1">
</fieldset>
<fieldset id="group2">
<!-- Question 02 -->
<input type="radio" value="" name="group2">
<input type="radio" value="" name="group2">
<input type="radio" value="" name="group2">
</fieldset>
</form>
That's probably happening because every "radio button pack" test_2() is generating has the same name property value (answ).
A quick solution would be to send a name as a parameter to test2 so you "namespace" your radiobuttons like this:
function test_2(name) {
var a = getRandom(0, 10) - 5;
...
radio1.setAttribute('name', name + '-answ');
...
}
This way, if you're calling this function within a loop, you can pass in the index as the name parameter and ensure uniqueness of names.

Why is output only showing on 2 of my input boxes?

Trying to learn JQUERY/HTML, so I am making a shopping cart. I am trying to output subtotal, tax, shipping, and total cost to input boxes. The first 2, sub total and shipping cost show, but nothing is outputted for the last 2 input boxes.
HTML
<div class="form-group">
<div class="subTotal">
<label for="subtotal"><span>Sub Total</span><span>*</span><input type="number" class="input-field" name="subtotal" id="subtotal" disabled/></label>
<label for="shipping"><span>Shipping</span><span>*</span><input type="number" class="input-field" name="shipping" id="shipping" disabled/></label>
<label for="tax"><span>Tax</span><span>*</span><input type="number" class="input-field" name="tax" id="taxCost" disabled/></label>
<label for="total"><span>Total</span><span>*</span><input type="number" class="input-field" name="total" id="total" disabled/></label>
</div>
</div>
JS
function calculateSum() {
var sum = 0;
// iterate through each td based on class and add the values
$(".cost").each(function () {
var value = $(this).text();
// add only if the value is number
if (!isNaN(value) && value.length != 0) {
sum += parseFloat(value);
}
});
var subtotal = sum;
var shippingCost = (sum * 0.085);
var tax = (((sum + shipping) * 0.11));
var total = (sum + shippingCost + tax);
$("#subtotal").val(subtotal);
$("#shipping").val(shippingCost);
$("#taxCost").val(tax);
$("#total").val(total);
};
Are you sure this isn't a typo?
var tax = (((sum + shipping) * 0.11));
Shouldn't it be
var tax = (((sum + shippingCost) * 0.11));
Alright so I tried to understand your code, first off I could not find .cost anywhere in the code so the output was 0 from the start, so I added a value to the inputs and then this.
This code block was your original code, the shipping variable is named wrongly, it's probably supposed to be shippingCost.
var tax = ((sum + shipping) * 0.11);
Here is the code.
https://jsfiddle.net/dbu41wpa/2/

How to switch functions javascript

I'd like to make something small. When you enter Celsius, the program should calculate Fahrenheit and vice-versa. But when I enter the celsius and click the button it does the vice-versa aswell. Since I'm a beginner I don't really know how not to execute function2 if function1 activates. My javascript looks like this:
JS:
function Omrekenen() {
var celsius = document.getElementById('Celsius').value;
var fahrenheit = document.getElementById('Fahrenheit').value;
var r1 = (celsius * 1.8) + 32;
var r2 = (fahrenheit / 1.8) - 32;
}
function Leeg1() {
document.getElementById('Fahrenheit').value = "";
}
function Leeg2() {
document.getElementById('Celsius').value = "";
}
<div class="Oefening">
<h1 class="Titel">Oefening 3</h1>
Celsius: <input type="number" id="Celsius" placeholder="°C" onkeyup=Leeg1()> Fahrenheit: <input type="number" id="Fahrenheit" placeholder="°F" onkeyup="Leeg2()"><br />
<input type="button" id="button3" value="Zet om" onclick="Omrekenen(); Vast();" class="Button">
</div>
Here's one way of doing this.
Note that I'm checking for the length of the value from the input. You can't check the truthiness (if (celsius) ...) in this case, since a value of 0 is valid, but would evaluate to false. Checking the length should work for each case.
function Omrekenen() {
var celsius = document.getElementById('Celsius').value;
var fahrenheit = document.getElementById('Fahrenheit').value;
if (celsius.length !== 0) {
document.getElementById('Fahrenheit').value = (celsius * 1.8) + 32;
} else if (fahrenheit.length !== 0) {
document.getElementById('Celsius').value = (fahrenheit / 1.8) - 32;
}
}
function Leeg1() {
document.getElementById('Fahrenheit').value = "";
}
function Leeg2() {
document.getElementById('Celsius').value = "";
}
<div class="Oefening">
<h1 class="Titel">Oefening 3</h1>
Celsius: <input type="number" id="Celsius" placeholder="°C" onkeyup=Leeg1()> Fahrenheit: <input type="number" id="Fahrenheit" placeholder="°F" onkeyup="Leeg2()"><br />
<input type="button" id="button3" value="Zet om" onclick="Omrekenen();" class="Button">
</div>
You can use a state variable also, but you'd also want to handle the paste action in that case.
<script>
var isCalculatingCelsius;
function Omrekenen()
{
var celsius = document.getElementById('Celsius').value;
var fahrenheit = document.getElementById('Fahrenheit').value;
if (isCalculatingCelsius){
document.getElementById('Celsius').value = (fahrenheit / 1.8) - 32;
} else {
document.getElementById('Fahrenheit').value = (celsius * 1.8) + 32;
}
}
function Leeg1(){
isCalculatingCelsius = false;
document.getElementById('Fahrenheit').value = "";
}
function Leeg2(){
isCalculatingCelsius = true;
document.getElementById('Celsius').value = "";
}
</script>
<div class="Oefening">
<h1 class="Titel">Oefening 3</h1>
Celsius: <input type="number" id="Celsius" placeholder="°C" onkeyup="Leeg1()">
Fahrenheit: <input type="number" id="Fahrenheit" placeholder="°F" onkeyup="Leeg2()"><br />
<input type="button" id="button3" value="Zet om" onclick="Omrekenen()" class="Button">
</div>

How do i find a factor of an integer in javascript?

I need to create a calculator where the user inputs a number, and it calculates the factors, cube and square of the given number.
Below is the code i am using.. I have NO idea how to work out the factor. Any advice would be appreciated.
document.getElementById('calculate').addEventListener('click', estimateTotal);
function estimateTotal(event) {
event.preventDefault();
var initial2 = document.getElementById('initial').value;
document.getElementById('factor').value = 0;
document.getElementById('sqaure').value = initial2 * initial2;
document.getElementById('cube').value = initial2 * initial2 * initial2;
}
<form id="calculator" method="POST">
<p>Please enter a number between 0 and 50 <input name="initial" id="initial" type="text" size="20" required><button id="calculate">Calculate</button></p>
<p>The Factorial of your number is: <input name="factor" id="factor" class="factor" type="text" size="20"></p>
<p>The Square of your number is:<input name="sqaure" id="sqaure" class="sqaure" type="text" size="20"></p>
<p>The Cube of your number is:<input name="cube" id="cube" class="cube" type="text" size="20"></p>
</form>
**recursive JavaScript function factor(n)**
**Check this link:** **http://www.javascripter.net/math/primes/factorization.htm**
function factor(n) {
if (isNaN(n) || !isFinite(n) || n%1!=0 || n==0) return ''+n;
if (n<0) return '-'+factor(-n);
var minFactor = leastFactor(n);
if (n==minFactor) return ''+n;
return minFactor+'*'+factor(n/minFactor);
}
try this for both factor and factorial
document.getElementById('calculate').addEventListener('click', estimateTotal);
function estimateTotal(event) {
event.preventDefault();
var initial2 = document.getElementById('initial').value;
document.getElementById('Factorial').value = fact(initial2);
document.getElementById('factor').value = factors(initial2);
document.getElementById('sqaure').value = initial2 * initial2;
document.getElementById('cube').value = initial2 * initial2 * initial2;
}
function fact(n)
{
if(n == 0)
return 1;
else
return (n*fact(n-1));
}
function factors(num)
{
var
n_factors = [],
i;
for (i = 1; i <= Math.floor(Math.sqrt(num)); i += 1)
if (num % i === 0)
{
n_factors.push(i);
if (num / i !== i)
n_factors.push(num / i);
}
n_factors.sort(function(a, b){return a - b;}); // numeric sort
return n_factors;
}
<p>Please enter a number between 0 and 50 <input name="initial" id="initial" type="text" size="20" required><button id="calculate">Calculate</button></p>
<p>The Factorial of your number is: <input name="factor" id="Factorial" class="factor" type="text" size="20"></p>
<p>The Factor of your number is: <input name="factor" id="factor" class="factor" type="text" size="20"></p>
<p>The Sqaure of your number is:<input name="sqaure" id="sqaure" class="sqaure" type="text" size="20"></p>
<p>The Cube of your number is:<input name="cube" id="cube" class="cube" type="text" size="20"></p>

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