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Bootstrap 4.0.0 Snippet by Rajeshreeputra

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/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 ---------->
<div class="container">
<div class="row">
<h2>Quantity increment buttons</h2>
<div class="col-lg-2">
<div class="input-group">
<span class="input-group-btn">
<button type="button" class="quantity-left-minus btn btn-danger btn-number" data-type="minus" data-field="">
<span class="glyphicon glyphicon-minus"></span>
</button>
</span>
<input type="text" id="quantity" name="quantity" class="form-control input-number" value="10" min="1" max="100">
<span class="input-group-btn">
<button type="button" class="quantity-right-plus btn btn-success btn-number" data-type="plus" data-field="">
<span class="glyphicon glyphicon-plus"></span>
</button>
</span>
</div>
</div>
</div>
</div>
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$(document).ready(function(){
var quantitiy=0;
$('.quantity-right-plus').click(function(e){
// Stop acting like a button
e.preventDefault();
// Get the field name
var quantity = parseInt($('#quantity').val());
// If is not undefined
$('#quantity').val(quantity + 1);
// Increment
});
$('.quantity-left-minus').click(function(e){
// Stop acting like a button
e.preventDefault();
// Get the field name
var quantity = parseInt($('#quantity').val());
// If is not undefined
// Increment
if(quantity>0){
$('#quantity').val(quantity - 1);
}
});
});
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