I have a basic prototype and I am looking to continuously update the 'Balance' value as payments are made. Can anyone advise me on how to maintain the 'Balance' variable using HTML, CSS, Javascript, and Bootstrap? After clicking Submit, I want the value to revert back to $10. I have attempted this using JavaScript with the following simple code:
<html><head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script type="text/javascript" src="http://netdna.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link href="http://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.3.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<link href="default.css" rel="stylesheet" type="text/css">
<script type="text/javascript">
var output=10;
function payment(){
var amount= document.getElementById ("amountID");
var merchant= document.getElementById("merchantID");
output = output - amount.value;
amount.value=" ";
var balance=document.getElementById("balance");
balance.innerHTML = output ;
}
</script>
</head><body>
<div class="row">
<div class="col-md-12">
<div class="headline">
<h1>Payment</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-3 col-md-3 col-lg-3">
<ul class="nav nav-pills nav-stacked">
<li class="active">
<a data-toggle="tab" href="#pay">Pay</a>
</li>
<li>
<a data-toggle="tab" href="#send">Send</a>
</li>
</ul>
</div>
<div class="col-xs-9 col-lg-9 col-md-9">
<div class="tab-content">
<div id="pay" class="tab-pane fade in active">
<div class="row">
<label class="col-md-4" style="text-align:right;"> Available Balance:</label>
<label class="col-md-4" id="balance"> 10$</label>
</div>
<form action="#" class="form-horizontal">
<fieldset>
<div class="form-group">
</div>
<div class="form-group">
<label class="control-label col-md-4 col-xs-4" for="merchantID"> Merchant ID: </label>
<div class="col-md-4 col-xs-4">
<input type="text" class="form-control" id="merchantID" autofocus/>
</div>
</div>
<div class="form-group">
<label class="control-label col-md-4 col-xs-4" for="amountID"> Amount:</label>
<div class="col-md-4 col-xs-4">
<input type="text" class="form-control" id="amountID" autofocus/>
</div>
</div>
<div class="form-group">
<div class="col-md-8 col-md-offset-4 col-xs-8 col-xs-offset-4">
<button class="btn btn-primary" onclick="payment()"> Submit </button>
</div>
</div>
</fieldset>
</form>