BMI calculator Code in Javascript.
We need three files.
- index.php
- min.js
- style.css
index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="./css/style.css" />
<title>Calculator</title>
</head>
<body>
<div id="showcase">
<div class="container">
<div class="overlay">
<h1>BMI Calculator</h1>
<div class="wrapper">
<div class="group">
<label for="height" style="text-align: left;">Height:</label>
<input
type="number"
name="height"
id="height"
placeholder="Height in cm"
required
/>
<label for="weight" style="text-align: left;" >Weight:</label>
<input
type="number"
name="weight"
id="weight"
placeholder="Weight in kg"
required
/>
<button type="button" id="calculate">Calculate</button>
</div>
<div id="result"></div>
<div class="weight-guide">
<h2>BMI Weight Guide</h2>
<p>Underweight = Less than 18.6</p>
<p>Normal = 18.6 and 24.9</p>
<p>Overweight = Greater than 24.9</p>
</div>
</div>
</div>
</div>
</div>
<script src="./js/main.js"></script>
</body>
</html>
min.js
'use strict';
document.querySelector('#calculate').addEventListener('click', function () {
const height = document.querySelector('#height').value;
const weight = document.querySelector('#weight').value;
const bmi = (weight / (height * 2)) * 100;
document.querySelector('#result').textContent = bmi.toFixed(1);
});
style.css
@import url('https://fonts.googleapis.com/css2?family=Lato&display=swap');
:root {
--primary-color: #3e6b92;
--secondary-color: #ecf5ff;
}
* {
font-family: 'Lato', sans-serif;
font-size: 20px;
margin: 0;
padding: 0;
box-sizing: border-box;
color: var(--primary-color);
}
#showcase {
background: url no-repeat center/cover;
height: 800px;
}
.overlay {
background-color: rgba(62, 107, 176, 0.5);
padding: 0 7px 7px 7px;
border-radius: 10px;
}
.container {
border-radius: 10px;
backdrop-filter: blur(
6px
); /*lets you apply graphical effects such as blurring or color shifting to the area behind an element.*/
display: flex;
flex-direction: column;
align-items: center;
width: 80%;
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
text-align: center;
box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.5);
}
.wrapper {
border-radius: 0 0 10px 10px;
background-color: orange;
width: 1200px;
}
h1 {
background-color: rgba(0, 0, 0, 0);
border-radius: 10px 10px 0 0;
margin-top: 2px;
margin-bottom: 2px;
border: none;
color: #000;
width: 100%;
font-weight: 100;
text-shadow: 0 0 15px rgba(255, 255, 255, 0.5),
0 0 10px rgba(255, 255, 255, 0.5), 2px 2px 2px rgba(206, 89, 55, 0);
}
.group {
display: flex;
flex-direction: column;
margin-bottom: 2rem;
margin-left: 2rem;
margin-right: 2rem;
}
#result {
margin-bottom: 2rem;
min-height: 2rem;
min-width: 4rem;
font-size: 2rem;
}
#height {
margin-bottom: 2rem;
}
button {
margin-top: 2rem;
padding: 50px;
border: 1px solid rgba(0, 0, 0, 0.637);
border-radius: 5px;
color: var(--primary-color);
background: linear-gradient(to bottom, #f4f5fd, #b9c9e0);
}
button:hover {
cursor:progress;
background: linear-gradient(to top, #fdf4fa, #b9dde0);
}
input {
border: 1px solid #000;
border-radius: 5px;
}