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@rahman541
Created August 1, 2018 19:40
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<!DOCTYPE html>
<html>
<head>
<title>Functional Programming</title>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<style type="text/css">
.form-control {
margin-top: .5rem;
}
</style>
</head>
<body>
<div class="container">
<div class="form-group">
<input type="email" id="email" class="form-control" placeholder="Email">
<input type="password" id="password" class="form-control" placeholder="Password">
<input type="submit" value="Sign Up" class="btn btn-success" id="signup">
</div>
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bacon.js/2.0.7/Bacon.min.js"></script>
<script>
$('#email')
.asEventStream('blur')
.map(function(e){ return !e.target.value; })
.assign($('#signup'), 'attr', 'disabled');
</script>
</body>
</html>
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