A program that will ask the user to give a number and then the program will check if the given number is a prime number or not using JavaScript programming language.
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Program Listing
index.htm
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Prime Number Checker in JavaScript</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background-color: #AAAF99;
color: #000;
font-family: sans-serif;
}
main {
padding: 50px;
border-radius: 10px;
background-color: #fff;
min-width: 500px;
}
h1 {
margin-bottom: 5px;
font-size: 28px;
text-align: center;
}
h2 {
margin-bottom: 30px;
font-size: 20px;
text-align: center;
}
.block {
margin: 0 auto 12px;
display: flex;
align-items: center;
}
label {
display: block;
width: 35%;
line-height: 40px;
background-color: #2F4C58;
color: #eee;
text-align: center;
}
input {
padding: 10px;
width: 65%;
font-size: 14px;
border-radius: 0 5px 5px 0;
border: 2px solid #000;
outline: none;
}
.btnBlock {
display: flex;
width: 100%;
}
.btn {
display: inline-block;
padding: 15px;
background-color: #63A583;
color: #fff;
outline: none;
border: none;
cursor: pointer;
width: 150px;
width: 50%;
font-size: 16px;
text-decoration: none;
text-align: center;
transition: all .2s;
}
.btnReset {
background-color: #6E93D6;
}
.btn:hover {
opacity: 0.9;
}
.average {
display: block;
width: 100%;
margin-top: 12px;
padding: 20px 0;
background-color: #2F4C58;
font-size: 16px;
text-align:center;
color: #f3f3f3;
}
.hide {
display: none;
}
</style>
</head>
<body>
<main class="container">
<h1>PRIME NUMBER CHECKER IN JAVASCRIPT</h1>
<h2>Jake R. Pomperada, MAED-IT, MIT</h2>
<form action="" id="frmCalc">
<div class="block">
<label for="val_num">Give A Number</label>
<input type="number" min="1" max="100" id="val_num" autofocus required>
</div>
<div class="btnBlock">
<button type="submit" class="btn">SUBMIT</button>
<a href="" class="btn btnReset">RESET</a>
</div><br>
<div class="display_result hide"></div>
</form>
</main>
<script>
document.querySelector('#frmCalc').onsubmit = (e) => {
e.preventDefault()
let i=0, chk=0;
let display = document.querySelector('.display_result'),
arr = document.getElementById("val_num");
num_val = 0;
num_val = parseInt(arr.value);
for(i=2; i<num_val; i++)
{
if(num_val%2==0)
{
chk++;
break;
}
}
if(chk==0)
result = num_val + " is a Prime Number";
else
result = num_val + " is not a Prime Number";
display.classList.remove('hide');
display.innerHTML = "<h1>" + result + "</h1>";
}
</script>
</body>
</html>
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