Counter App using HTML, CSS and JavaScript
In this tutorial, we are going to develop a simple Counter App using HTML, CSS and JavaScript. The code uses JavaScript event listener to either increment or decrement the counter value.
Source Code :
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Counter App</title>
<style type="text/css">
body{
background: #b3caff;
text-align: center;
}
h1{
margin: 20px 0px;
}
.center{
margin: auto;
width: 20%;
}
.box{
font-size: 75px;
font-weight: bold;
color: blue;
background: #e6bbbb;
padding: 30px;
border: 2px solid #ec3535;
margin-top: 30px;
border-radius: 5%;
}
.btns{
margin-top: 30px;
}
.btn:hover{
opacity: 0.5;
}
.btn:active{
box-shadow: 3px 2px 22px 1px rgba(0,0,0,0.24);
transform: scale(0.88);
}
.btn{
padding: 2px 15px;
color: #fff;
font-size: 28px;
cursor: pointer;
}
.btn-add{
background: green;
float: left;
border: 2px solid #346b3b;
}
.btn-subtract{
background: red;
float: right;
border: 2px solid #c34e4e;
}
</style>
</head>
<body>
<h1>Counter App</h1>
<hr>
<div class="box center">
<span id="number">0</span>
</div>
<div class="btns center">
<span class="btn btn-add">+</span>
<span class="btn btn-subtract">-</span>
</div>
<script type="text/javascript">
addBtn = document.getElementsByClassName('btn-add')[0];
subtractBtn = document.getElementsByClassName('btn-subtract')[0];
number = document.getElementById('number');
addBtn.addEventListener('click',function(){
number.innerHTML = parseInt(number.innerHTML)+1;
});
subtractBtn.addEventListener('click',function(){
number.innerHTML = parseInt(number.innerHTML)-1;
});
</script>
</body>
</html>
