# How to Check If Number is Odd or Even in Javascript

In this tutorial, you will learn how to check if number is odd or even in javascript. The number which is divisible by 2 and has a remainder of 1 is known as an odd number. For example 1, 3, 5, 7, etc. On the other hand, the number which is divisible by 2 and has a remainder of 0 is known as an even number. For example 2, 4, 6, 8, etc.

Detecting whether a number is odd or even is very easy, but it can be tricky if the number is coming from an input field because the value present in the input field is of string type. So first, we have to convert it into a number type using the `Number()` method and then perform any sort of calculations.

There are numerous ways to find whether a number is odd or even. But for the sake of simplicity, we will only use the modulus (`%`) operator which is enough to get the job done.

In the following example, we will enter a random number in the input field. Upon click of a button, we will check whether the number is odd or even and display the result on the screen.  Please have a look over the code example and the steps given below.

HTML & CSS

• We have 4 elements in the HTML file (`div`, `input`, `button`, and `h1`). The `div` element is just a wrapper for the rest of the elements.
• The `innerText` for the `button` element is `“Get”` and for the `h1` element, it is `“Result”`.
• We have done some basic styling using CSS and added the link to our `style.css` stylesheet inside the `head` element.
• We have also included our javascript file `script.js` with a `script` tag at the bottom.
```<!DOCTYPE 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">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>

<body>

<div class="container">
<input type="number" placeholder="Enter Number">
<button>Get</button>
<h1>Result</h1>
</div>

<script src="script.js"></script>
</body>

</html>```
```.container {
text-align: center;
}

button {
margin-top: 10px;
padding: 10px 20px;
}

input {
display: block;
margin: 10px auto;
padding: 10px 20px;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
-webkit-appearance: none;
margin: 0;
}```

Javascript

• We have selected the `input` element, `button` element, and `h1` element using the `document.querySelector()` method and stored them in `input`, `btnGet`, and `output` variables respectively.
• We have attached a `click` event listener to the `button` element.
• In the event handler function, we are getting value from the `input` element using `value` property. We are converting it into number type using the `Number()` method and storing it in the `num` variable.
• We are using the modulus (`%`) operator and ternary (`?`) operator to verify when the `num` is divided by 2, it has a remainder of 0 or not. Depending upon the returned Boolean value, we will assign `“Odd”` or `“Even”` to the `result` variable.
• We are displaying the `result` in the `h1` element using the `innerText` property.
```let input = document.querySelector("input");
let btnGet = document.querySelector("button");
let output = document.querySelector("h1");

btnGet.addEventListener("click", () => {
let num = Number(input.value);
let result = num % 2 === 0 ? "Even" : "Odd";
output.innerText = result;
});
```