Created
March 11, 2019 17:12
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Simple BMI calculator
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| function in_range(x, min, max) { | |
| return x >= min && x <= max; | |
| } | |
| function return_bmi(weight, height) { | |
| // weight should be in kilograms | |
| // height should be in meters | |
| return weight / (height ** 2); | |
| } | |
| function specify_bmi(bmi_value) { | |
| if (bmi_value < 18.5) { | |
| return 'niedowagę'; | |
| } else if (in_range(bmi_value, 18.5, 24.9)) { | |
| return 'wagę prawidłową'; | |
| } else if (in_range(bmi_value, 25, 29.9)) { | |
| return 'nadwagę (no jesteś ulanicem)'; | |
| } else if (bmi_value > 30) { | |
| return 'otyłość' | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Kalkulator BMI</title> | |
| <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> | |
| <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> | |
| <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> | |
| <script src="calculator.js"></script> | |
| <script src="init.js"></script> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <h1 class="text-center">Kalkulator BMI</h1> | |
| <div class="row"> | |
| <div class="col-lg-6"> | |
| <p><label for="height">Wzrost (w metrach)</label> | |
| <input style="width: 300px" type="number" id="height" class="form-control" value="1.7" step="0.05"> | |
| </p> | |
| <p> | |
| <label for="weight">Waga (w kilogramach)</label> | |
| <input style="width: 300px" type="number" id="weight" class="form-control" value="60" step="0.5"> | |
| </p> | |
| </div> | |
| <div class="col-lg-6"> | |
| <h2>Twoje BMI to: <span id="result" class="text-primary">20.76</span></h2> | |
| <h2>Oznacza to, że masz <span id="result2" class="text-primary">wagę prawidłową</span></h2> | |
| </div> | |
| </div> | |
| </div> | |
| </body> | |
| </html> |
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| function update_calc() { | |
| height = parseFloat($('#height').val()); | |
| weight = parseFloat($('#weight').val()); | |
| bmi_value_result = return_bmi(weight, height); | |
| console.log(bmi_value_result); | |
| $('#result').text( | |
| bmi_value_result.toFixed(2).toString() | |
| ); | |
| $('#result2').text( | |
| specify_bmi( | |
| bmi_value_result | |
| ) | |
| ) | |
| } | |
| $(document).on('change', '#weight', | |
| function () { | |
| update_calc() | |
| } | |
| ); | |
| $(document).on('change', '#height', | |
| function () { | |
| update_calc() | |
| } | |
| ); |
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