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<!DOCTYPE html>
<html>
<head lang="pt">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="shortcut icon" href="data:image/x-icon;," type="image/x-icon">
<style type="text/css" media="screen">
/* Resettings some html properties */
html, body, div, h1, header,section{
margin: 0;
padding: 0;
border: 0;
}
h1 {
font-size: 1.25rem;
color: #fff;
text-transform: uppercase;
}
ul {
margin: 0;
}
body {
font-family: sans-serif;
background-color: #f4f4f4;
}
header {
position: relative;
margin: auto;
margin-bottom: 20px;
background: #0062cc;
padding: 10px;
max-width: 900px;
}
nav {
position: absolute;
top: 10px;
right: 10px;
}
.warning {
font-size: small;
color: red;
visibility: hidden;
}
.btn {
display: inline-block;
padding: .1rem .75rem;
background: #e9ecef;
border: #343a40 1px solid;
font-size: .9rem;
font-weight: 400;
line-height: 1.5;
cursor: pointer;
color: #000;
border-radius: 0;
text-transform: lowercase;
}
nav li {
display: inline;
margin: 0 0 0 0;
}
.section {
justify-content: center;
margin-bottom: 20px;
display: flex;
}
main {
width: 50%;
margin: 0 auto;
}
</style>
</head>
<body>
<header>
<h1>Regra de três</h1>
<nav>
<ul>
<li>
<a class="btn" href="https://git.sr.ht/~gabrielgio/tres">Código fonte</a>
</li>
</ul>
</nav>
</header>
<main>
<div class="section">
<input type="number" id="a" placeholder="A">
=
<input type="number" id="b" placeholder="B">
</div>
<div class="section">
<input type="number" id="c" placeholder="C">
=
<input type="number" id="resultado" disabled placeholder="Resultado">
</div>
<div id="warning" class="section warning">
<p>
</p>
</div>
<div class="section">
<input type="button" value="Calcular"onclick="eval()">
</div>
</main>
<script>
const aInput = document.getElementById('a')
const bInput = document.getElementById('b')
const cInput = document.getElementById('c')
const resultadoInput = document.getElementById('resultado')
const warningParagraph = document.getElementById('warning')
function eval() {
const a = aInput.value
const b = bInput.value
const c = cInput.value
try {
const values = validate(a,b,c)
resultadoInput.value = calculate(...values)
} catch (e) {
warningParagraph.textContent = e
warningParagraph.style.visibility = 'visible';
setTimeout(() => {
warningParagraph.style.visibility = 'hidden';
}, 3000)
}
}
function validate(a, b, c) {
const result = [0,0,0]
const ra = parseInt(a)
if (isNaN(ra)){
throw "Valor de A invalido"
}
result[0] = ra
const rb = parseInt(b)
if (isNaN(rb)){
throw "Valor de B invalido"
}
result[1] = rb
const rc = parseInt(c)
if (isNaN(rc)){
throw "Valor de C invalido"
}
result[2] = rc
return result
}
function calculate(a, b, c) {
return (b*c)/a
}
</script>
</body>
</html>
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