"Jquery increment and decrement"
Bootstrap 4.1.1 Snippet by imsachin

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html lang="en">
<head>
<title>HTML</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Roboto:400,500,700" rel="stylesheet">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!--[if IE]> <link href="~/Content/NewHomePage/all-ie-only.css" rel="stylesheet" /> <![endif]-->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<form id='myform' method='POST' action='#'>
<input type='button' value='-' class='qtyminus' field='quantity' />
<input type='text' name='quantity' value='0' class='qty' />
<input type='button' value='+' class='qtyplus' field='quantity' />
</form>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="custom.js"></script>
</body>
</html>
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#myform {
text-align: center;
padding: 5px;
border: 1px dotted #ccc;
margin: 2%;
}
.qty {
width: 40px;
height: 25px;
text-align: center;
}
input.qtyplus { width:25px; height:25px;}
input.qtyminus { width:25px; height:25px;}
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jQuery(document).ready(function(){
// This button will increment the value
$('.qtyplus').click(function(e){
// Stop acting like a button
e.preventDefault();
// Get the field name
fieldName = $(this).attr('field');
// Get its current value
var currentVal = parseInt($('input[name='+fieldName+']').val());
// If is not undefined
if (!isNaN(currentVal)) {
// Increment
$('input[name='+fieldName+']').val(currentVal + 1);
} else {
// Otherwise put a 0 there
$('input[name='+fieldName+']').val(0);
}
});
// This button will decrement the value till 0
$(".qtyminus").click(function(e) {
// Stop acting like a button
e.preventDefault();
// Get the field name
fieldName = $(this).attr('field');
// Get its current value
var currentVal = parseInt($('input[name='+fieldName+']').val());
// If it isn't undefined or its greater than 0
if (!isNaN(currentVal) && currentVal > 0) {
// Decrement one
$('input[name='+fieldName+']').val(currentVal - 1);
} else {
// Otherwise put a 0 there
$('input[name='+fieldName+']').val(0);
}
});
});
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