Francisco Chaves

Software Developer.
Chatbot Developer.

Modo escuro

Calcule IMC com JavaScript

9 de agosto de 2017

Algoritmo
JavaScript

Olá pessoal, sabemos que a saúde do corpo interfere na saúde mental, por isso que hoje deixarei um programa para realizar o cálculo do IMC, que indica o peso considerável saudável.

Visualize o Pen Calcule seu IMC feito por Francisco Chaves (@franciscochaves) em CodePen.

Código HTML:

<!-- HTML -->

<main class="main">
  <section class="calc-imc">
    <h1>Calculadora IMC</h1>
    <form class="form" id="form">
      <label for="kilos">
        Quilos
        <input name="kilos" id="kilos" placeholder="Peso atual" type="number" />
      </label>
      <label for="altura">
        Altura
        <input
          name="altura"
          id="altura"
          placeholder="Altura em centímetros"
          type="number"
        />
      </label>
      <label for="imc">
        IMC
        <input disabled="disabled" name="imc" id="imc" />
      </label>
      <button>Calcular</button>
    </form>
  </section>
</main>

Código CSS:

/* CSS */

@import url('https://fonts.googleapis.com/css2?family=Acme&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Acme', sans-serif;
  font-size: 20px;
  color: #2c3e50;
  background-color: #dfdbe5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260' viewBox='0 0 260 260'%3E%3Cg fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='1'%3E%3Cpath d='M24.37 16c.2.65.39 1.32.54 2H21.17l1.17 2.34.45.9-.24.11V28a5 5 0 0 1-2.23 8.94l-.02.06a8 8 0 0 1-7.75 6h-20a8 8 0 0 1-7.74-6l-.02-.06A5 5 0 0 1-17.45 28v-6.76l-.79-1.58-.44-.9.9-.44.63-.32H-20a23.01 23.01 0 0 1 44.37-2zm-36.82 2a1 1 0 0 0-.44.1l-3.1 1.56.89 1.79 1.31-.66a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .9 0l2.21-1.1a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .9 0l2.21-1.1a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .86.02l2.88-1.27a3 3 0 0 1 2.43 0l2.88 1.27a1 1 0 0 0 .85-.02l3.1-1.55-.89-1.79-1.42.71a3 3 0 0 1-2.56.06l-2.77-1.23a1 1 0 0 0-.4-.09h-.01a1 1 0 0 0-.4.09l-2.78 1.23a3 3 0 0 1-2.56-.06l-2.3-1.15a1 1 0 0 0-.45-.11h-.01a1 1 0 0 0-.44.1L.9 19.22a3 3 0 0 1-2.69 0l-2.2-1.1a1 1 0 0 0-.45-.11h-.01a1 1 0 0 0-.44.1l-2.21 1.11a3 3 0 0 1-2.69 0l-2.2-1.1a1 1 0 0 0-.45-.11h-.01zm0-2h-4.9a21.01 21.01 0 0 1 39.61 0h-2.09l-.06-.13-.26.13h-32.31zm30.35 7.68l1.36-.68h1.3v2h-36v-1.15l.34-.17 1.36-.68h2.59l1.36.68a3 3 0 0 0 2.69 0l1.36-.68h2.59l1.36.68a3 3 0 0 0 2.69 0L2.26 23h2.59l1.36.68a3 3 0 0 0 2.56.06l1.67-.74h3.23l1.67.74a3 3 0 0 0 2.56-.06zM-13.82 27l16.37 4.91L18.93 27h-32.75zm-.63 2h.34l16.66 5 16.67-5h.33a3 3 0 1 1 0 6h-34a3 3 0 1 1 0-6zm1.35 8a6 6 0 0 0 5.65 4h20a6 6 0 0 0 5.66-4H-13.1z'/%3E%3Cpath id='path6_fill-copy' d='M284.37 16c.2.65.39 1.32.54 2H281.17l1.17 2.34.45.9-.24.11V28a5 5 0 0 1-2.23 8.94l-.02.06a8 8 0 0 1-7.75 6h-20a8 8 0 0 1-7.74-6l-.02-.06a5 5 0 0 1-2.24-8.94v-6.76l-.79-1.58-.44-.9.9-.44.63-.32H240a23.01 23.01 0 0 1 44.37-2zm-36.82 2a1 1 0 0 0-.44.1l-3.1 1.56.89 1.79 1.31-.66a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .9 0l2.21-1.1a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .9 0l2.21-1.1a3 3 0 0 1 2.69 0l2.2 1.1a1 1 0 0 0 .86.02l2.88-1.27a3 3 0 0 1 2.43 0l2.88 1.27a1 1 0 0 0 .85-.02l3.1-1.55-.89-1.79-1.42.71a3 3 0 0 1-2.56.06l-2.77-1.23a1 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6h-3v9a5 5 0 1 1-10 0v-9h-3a6 6 0 0 1-6-6v-24a14 14 0 0 1 14-14 5 5 0 0 0 5 5zm-17 15v12a1.99 1.99 0 0 0 1.22 1.84 2 2 0 0 0 2.44-.72c.21-.32.34-.7.34-1.12v-12h2v12a3.98 3.98 0 0 1-5.35 3.77 3.98 3.98 0 0 1-.65-.3V209a4 4 0 0 0 4 4h16a4 4 0 0 0 4-4v-24c.01-1.53-.23-2.88-.72-4.17-.43.1-.87.16-1.28.17a6 6 0 0 1-5.2-3 7 7 0 0 1-6.47-4.88A12 12 0 0 0 58 185v6zm9 24v9a3 3 0 1 0 6 0v-9h-6z'/%3E%3Cpath d='M-17 191a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2h-2zm19 9a1 1 0 0 1 1-1h2a1 1 0 0 1 0 2H3a1 1 0 0 1-1-1zm-14 5a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2h-2zm-25 1a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2h-2zm5 4a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2h-2zm9 0a1 1 0 0 1 1-1h2a1 1 0 0 1 0 2h-2a1 1 0 0 1-1-1zm15 1a1 1 0 0 1 1-1h2a1 1 0 0 1 0 2h-2a1 1 0 0 1-1-1zm12-2a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2H4zm-11-14a1 1 0 0 1 1-1h2a1 1 0 0 1 0 2h-2a1 1 0 0 1-1-1zm-19 0a1 1 0 0 0 0 2h2a1 1 0 0 0 0-2h-2zm6 5a1 1 0 0 1 1-1h2a1 1 0 0 1 0 2h-2a1 1 0 0 1-1-1zm-25 15c0-.47.01-.94.03-1.4a5 5 0 0 1-1.7-8 3.99 3.99 0 0 1 1.88-5.18 5 5 0 0 1 3.4-6.22 3 3 0 0 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}

.main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.calc-imc {
  padding: 1em;
  box-shadow: 6px 6px 20px gray, -6px -6px 20px white;
  background-color: #dfdbe5;
}

@media (min-width: 500px) {
  .calc-imc {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 500px;
    width: 100%;
    padding: 1em;
  }
}

.calc-imc h1 {
  text-align: center;
  font-size: 2em;
  text-decoration: underline;
}

.form {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 0.3em;
}

.form label,
.form button {
  margin-top: 1em;
}

.form input,
.form button {
  font-size: inherit;
  font-family: inherit;
  width: 100%;
  padding: 0.5em;
}

.form button {
  background-color: #fbefff;
  cursor: pointer;
  border-radius: 0.3em;
  width: 50%;
}

.form button:hover {
  filter: opacity(0.8);
}

.form button:active {
  background-color: #ffefff;
  color: #000;
  filter: opacity(0.8);
}

.message {
  display: block;
  width: 100%;
  height: 50px;
  text-align: center;
  line-height: 50px;
  font-size: 1.2rem;
  font-style: italic;
  position: fixed;
  box-shadow: 0 0 4px #333;
}

@media screen and (max-width: 500px) {
  .message {
    bottom: 0;
  }
}

.sucess {
  background-color: #2ecc71;
  color: #fff;
}

.warning {
  background-color: #e67e22;
  color: #fff;
}

.alert {
  background-color: #e74c3c;
  color: #fff;
}

.danger {
  background-color: #c0392b;
  color: #fff;
}

Código JS:

// JS

function validaEntrada(args) {
  for (let i = 0; i < arguments.length; i++) {
    if (!!arguments[i] == false || arguments[i] < 0) {
      return false;
    }
  }
  return true;
}

function calcularIMC(kilos, altura) {
  altura = altura / 100;
  return kilos / (altura * altura);
}

const formCalcularIMC = document.getElementById('form');

formCalcularIMC.addEventListener('submit', function (event) {
  event.preventDefault();

  const kilos = parseFloat(document.getElementById('kilos').value);
  const altura = parseFloat(document.getElementById('altura').value);

  if (validaEntrada(kilos, altura)) {
    const imc = calcularIMC(kilos, altura);
    document.getElementById('imc').value = parseFloat(imc).toFixed(2);
    verificarIMC(imc);
  } else {
    document.getElementById('imc').value = '## ERRO ##';
  }
});

function verificarIMC(imc) {
  if (imc < 17) {
    createMessage('Muito abaixo do peso', 'alert');
  } else if (imc > 17 && imc <= 18.49) {
    createMessage('Abaixo do peso', 'warning');
  } else if (imc >= 18.5 && imc <= 24.99) {
    createMessage('Peso normal', 'sucess');
  } else if (imc >= 25 && imc <= 29.99) {
    createMessage('Acima do peso', 'warning');
  } else if (imc >= 30 && imc <= 34.99) {
    createMessage('Obesidade I', 'alert');
  } else {
    createMessage('Obesidade II', 'danger');
  }
}

function createMessage(msg, type) {
  document
    .querySelector('body')
    .insertAdjacentHTML(
      'beforebegin',
      `<div class='message ${type}'>${msg}</div>`
    );

  setTimeout(function () {
    deleteMessage();
  }, 3000);
}

function deleteMessage() {
  const list = document.querySelectorAll('.message');
  for (const item of list) {
    item.remove();
  }
}

Para verificar se está com o IMC ideal, visualize o quadro abaixo.

IMC	Categoria
Abaixo de 17	Muito abaixo do peso
Entre 17 e 18,49	Abaixo do peso
Entre 18,5 e 24,99	Peso normal
Entre 25 e 29,99	Acima do peso
Entre 30 e 34,99	Obesidade I
Entre 35 e 39,99	Obesidade II

Se o peso calculado não foi o ideal, não desamine, procure fazer caminhadas ou algum exercício e claro procure um médico para te aconselhar sobre uma melhor forma de obter resultados para retornar ao seu peso ideal.

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