こちらのエントリー で紹介されている ipinfo.io のJSONPを使った検索サンプルです
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Geo Sample</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<style type="text/css">
body {
padding-top: 50px;
}
.starter-template {
padding: 40px 15px;
text-align: center;
}
</style>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false"
aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Project name</a>
</div>
<div id="navbar" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active">
<a href="#">Home</a>
</li>
</ul>
</div>
<!--/.nav-collapse -->
</div>
</nav>
<div class="container">
<div class="starter-template">
<form id="ip-search">
<label for="ipaddr" class="sr-only">IP address</label>
<input type="text" id="ipaddr" class="form-control" placeholder="IP address here" required="" autofocus="">
<button class="btn btn-lg btn-primary btn-block" type="submit">Search</button>
</form>
<div id="result"></div>
</div>
</div>
<!-- /.container -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>
<script id="result-template" type="text/template">
<br/><hr/>
<table class="table">
<tbody>
<tr>
<th>IP address</th>
<td>
<%= ip %>
</td>
</tr>
<tr>
<th>Country</th>
<td>
<%= country %>
</td>
</tr>
<tr>
<th>Org</th>
<td>
<%= org %>
</td>
</tr>
<tr>
<th>Addr</th>
<td>
〒<%= postal %><br/>
<%= region %> <%= city %>
</td>
</tr>
</tbody>
</table>
</script>
<script type="text/javascript">
function callback(data) {
var template = $("#result-template").text();
var compiled = _.template(template);
$("#result").html(compiled(data));
}
$(function(){
$('#ip-search').on('submit', function(){
$.get("http://ipinfo.io/" + $('#ipaddr').val() + "/?callback=callback");
return false;
});
});
</script>
</body>
</html>
