"購物_數量選擇"
Bootstrap 3.3.0 Snippet by taironlife

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h2 class="text-center">購物_數量選擇</h2>
<div class="col-md-6">
<h2 class="text-center">無限制大小</h2>
<div class="input-group number-spinner">
<span class="input-group-btn">
<button class="btn btn-default" data-dir="dwn"><span class="glyphicon glyphicon-minus"></span></button>
</span>
<input type="text" class="form-control text-center" value="1">
<span class="input-group-btn">
<button class="btn btn-default" data-dir="up"><span class="glyphicon glyphicon-plus"></span></button>
</span>
</div>
</div>
<div class="col-md-6">
<h2 class="text-center">有限制大小</h2>
<div class="input-group number-spinner" style="display: inline-block;width: auto;">
<span class="input-group-btn" style="float: left;width: auto;">
<button class="btn btn-default" data-dir="dwn" style="height: 34;"><span class="glyphicon glyphicon-minus"></span></button>
</span>
<input name="buy_num" id="buy_num" type="text" class="form-control text-center" value="1" style="width:4em;">
<span class="input-group-btn" style="display: inline-block;">
<button class="btn btn-default" data-dir="up" style="height: 34;"><span class="glyphicon glyphicon-plus"></span></button>
</span>
</div>
</div>
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.btn-default{
color: #444444;
border-radius: 0;
background-color: #E2E2E2;
border-color: #8E8E8E;
}
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$(document).on('click', '.number-spinner button', function () {
var btn = $(this),
oldValue = btn.closest('.number-spinner').find('input').val().trim(),
newVal = 0;
if (btn.attr('data-dir') == 'up') {
newVal = parseInt(oldValue) + 1;
} else {
if (oldValue > 1) {
newVal = parseInt(oldValue) - 1;
} else {
newVal = 1;
}
}
btn.closest('.number-spinner').find('input').val(newVal);
});
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