Posting as solution based on comments from
ppolymorphe [
^]
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
$(function () {
$('#login-form-link').click(function (e) {
debugger;
$("#login-form").delay(0).fadeIn();
$("#register-form").delay(0).fadeOut(0);
$('#register-form-link').removeClass('active');
$(this).addClass('active');
e.preventDefault();
});
$('#register-form-link').click(function (e) {
debugger;
$("#register-form").delay(0).fadeIn(0);
$("#login-form").delay(0).fadeOut(0);
$('#login-form-link').removeClass('active');
$(this).addClass('active');
e.preventDefault();
});
})
</script>
</head>
<body>
<div id="regContainer" class="container">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<div class="panel panel-login">
<div class="panel-heading">
<div class="row">
<div class="col-xs-6">
<a href="#" class="active" id="login-form-link">Login</a>
</div>
<div class="col-xs-6">
<a href="#" id="register-form-link">Register</a>
</div>
</div>
<hr>
</div>
<div class="panel-body">
<div class="row">
<div class="col-lg-12">
<form id="login-form" action="#" method="post" role="form">
<div class="form-group">
<label for="username">Username</label>
<input type="text" name="username" id="username" tabindex="1" class="form-control" placeholder="Username" value="">
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" name="password" id="password" tabindex="2" class="form-control" placeholder="Password">
</div>
<div class="form-group text-center">
<input type="checkbox" tabindex="3" class="" name="remember" id="remember">
<label for="remember"> Remember Me</label>
</div>
<div class="form-group">
<div class="row">
<div class="col-sm-6 col-sm-offset-3">
<input type="submit" name="login-submit" id="login-submit" tabindex="4" class="form-control btn btn-login" value="Log In">
</div>