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BMI Calculator with Javascript
Posted by NzCoding - 22 December 2021

Video Tutorial:
Html Code:
<!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>BMI Calculator</title><!-- Bootstrap Css --><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css"></head><body class="bg-info"><div class="container mt-5"><div class="row justify-content-center"><div class="col-lg-5 col-md-7 mt-5"><div class="card mt-5"><div class="card-header text-center"><h1>BMI Calculator</h1></div><div class="card-body"><form action=""><div class="form-group"><label for="" class="font-weight-bold">Height (CM):</label><input type="text" name="" id="height" class="form-control" placeholder="Enter height"></div><div class="form-group"><label for="" class="font-weight-bold">Weight (KG):</label><input type="text" name="" id="weight" class="form-control" placeholder="Enter weight"></div><div class="form-group text-center mt-4"><button class="btn btn-primary">Calculate</button></div></form><div class="row"><div class="col-12 mt-4 text-center"><h4>Result: <span id="results">0</span></h4></div></div><div class="row"><div class="col-12 mt-4 text-left"><h6 class="mb-3 text-success"><strong>BMI Weight Guide</strong></h6><p class="m-0"><strong>Under Weight:</strong> Less Than 18.6</p><p class="m-0"><strong>Normal Weight:</strong> 18.6 to 24.9</p><p class="m-0"><strong>Over Weight:</strong> Greater Than 24.9</p></div></div></div></div></div></div></div><!-- Bootstrap Scripts --><script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js"></script><script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script><script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.min.js"></script><script src="script.js"></script></body></html>
Javascript Code:
const form = document.querySelector('form');form.addEventListener('submit', function(e){e.preventDefault();const height = parseInt(document.querySelector('#height').value);const weight = parseInt(document.querySelector('#weight').value);const result = document.querySelector('#results');if(height === '' || (height < 0) || (isNaN(height))){result.innerHTML = "Please enter a valid height";}else if(weight === '' || (weight < 0) || (isNaN(weight))){result.innerHTML = "Please enter a valid weight";}else{const bmi = (weight / ((height*height)/10000)).toFixed(2);result.innerHTML = bmi;}})
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