Javascript Turorial App - Viết ứng dụng chuyển đổi đơn vị cân nặng pounds
File index.html
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
<link href="https://fonts.googleapis.com/css?family=Open+Sans:600,700" rel="stylesheet">
<title>Weight Converter</title>
<style>
body{
margin-top:70px;
background:#333;
color:#fff;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-6 offset-md-3">
<h1 class="display-4 text-center mb-3">Weight Converter</h1>
<form>
<div class="form-group">
<input id="lbsInput" type="number" class="form-control form-control-lg" placeholder="Enter Pounds...">
</div>
</form>
<div id="output">
<div class="card card-primary mb-2">
<div class="card-block">
<h4>Grams:</h4>
<div id="gramsOutput"></div>
</div>
</div>
<div class="card card-success mb-2">
<div class="card-block">
<h4>Kilograms:</h4>
<div id="kgOutput"></div>
</div>
</div>
<div class="card card-danger mb-2">
<div class="card-block">
<h4>Ounces:</h4>
<div id="ozOutput"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
File App.js
document.getElementById("output").style.visibility = "hidden";
document.getElementById("lbsInput").addEventListener("input", function(e) {
document.getElementById("output").style.visibility = "visible";
let lbs = e.target.value;
document.getElementById("gramsOutput").innerHTML = lbs / 0.0022046;
document.getElementById("kgOutput").innerHTML = lbs / 2.2046;
document.getElementById("ozOutput").innerHTML = lbs * 16;
});