BMI calculator Code in Javascript

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>

<!DOCTYPE html>

<head>

<title>Calculator</title>

</head>

<body>

<h1>BMI Calculator</h1>

<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>

<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>

</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);
});

'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;
}

@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;

}

BMI calculator Code in Javascript
By: Prof. Dr. Fazal Rehman | Last updated: March 3, 2022

Download BMI calculator Code in Javascript

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